TW201007708A - Apparatus and method for generating a bandwidth extended signal - Google Patents

Abstract

An apparatus for generating a bandwidth extended signal from an input signal comprises a patch generator and a combiner. The input signal is represented for a first band by a first resolution data, and for a second band by a second resolution data, the second resolution being lower than the first resolution. The patch generator generates a first patch from the first band of the input signal according to a first patching-algorithm and generates a second batch from the first band of the input signal according to a second patching algorithm. A spectral density of the second patch generated according to the second patching algorithm is higher than a spectral density of a first patch generated according to the first patching algorithm. The combiner combines the first, the. second patch and the first band of the input signal to obtain the bandwidth_ extended signal. The apparatus for generating a bandwidth extended signal scales the input second patching algorithm or scales the first Patch and the second patch, criterion.

Description

201007708 VI. DESCRIPTION OF THE INVENTION: [Technical Fields According to the Invention] Embodiments in accordance with the present invention relate to audio signal processing, and in particular to apparatus and methods for generating a bandwidth extension signal from an input signal for input based Signals and audio signals provide means and method for reducing the bandwidth. Perceptual adaptive coding of the SfUs number, which provides substantial data rate reduction for efficient storage and transmission of these signals, has gained wide acceptance in many fields. Many coding algorithms are known, such as MPEG 1/2 Layer 3 ("MP3") or MPEG 4 AAC (High Order Audio Coding). However, the use of this code', especially when operating at the lowest bit rate, can result in a reduction in subjective audio quality' which is typically caused primarily by limitations imposed by the encoder side of the bandwidth of the transmitted audio signal. It is known from WO 98 57436 that in this case the audio signal is subject to a band limitation at the encoder end and only a lower frequency band of the audio signal is encoded by a high quality audio encoder ("core coder"). However, the higher frequency band is only very roughly characterized, i.e., through a set of parameters that reproduce the spectral envelope of the higher frequency band. At the decoder side, the higher frequency bands are synthesized. To achieve this, wave transposition is proposed in which the lower frequency band of the decoded audio signal is provided to a filter bank. The lower frequency band chopper bank channel is connected to the higher band filter bank channel or is "patched," and each repaired bandpass signal suffers from envelope adjustment. Synthesis filter bank reception belonging to a specific analysis filter bank The bandpass signal of the audio signal in the lower frequency band and the envelope-adjusted bandpass signal of the lower band 201007708' are modulated and patched into the higher frequency band. The output signal of the synthesis filter bank is relative to its original An audio signal whose bandwidth is extended, which is transmitted from the encoder side to the decoder side through a core encoder operating at a very low data rate. In particular, filter bank calculation and repair in the filter bank domain may become High computational work. The complexity reduction method for bandwidth extension band-limited audio signals replaces the use of the low-frequency signal portion (LF) to the high-frequency range (HF) copy function to approximate the loss of information due to band limitation. Described below: M. Dietz, L. Lilje, adopted at the 112th AES convention (Munich) in Munich in May 2002 Ryd, K. Kj0rling and O. Kunz, “Spectral Band Replication, a novel approach in audio coding”; S. Meltzer, R. B0hm and F. Henn, adopted at the 112th AES meeting in Munich in May 2002 "SBR enhanced audio codecs for digital broadcasting such as "Digital Radio Mondiale" (DRM)"; T. Ziegler, A. Ehret, Ρ Ekstrand and M adopted at the 112th AES meeting in Munich in May 2002 Lutzky's "Enhancing mp3 with SBR: Features and Capabilities of the new mp3PRO Algorithm"; international standard ISO/IEC 14496-3:2001/FPDAM 1, "Bandwidth Extension", ISO/IEC 2002 or Vasu Iyengar et al. Nr. 5,455,888 "Speech bandwidth extension method and apparatus". In these methods, no harmonic transposition is performed, but the continuous bandpass signal of the lower band 201007708 is introduced into the higher band continuous filter bank channel. Through this, the sound says that the rough approximation of the souther frequency band is realized. In another step, this rough approximation of the signal is similar to the original by using post-processing of the control information obtained from the original signal. Here, for example, the scaling factor is used to adapt the spectral envelope, the inverse chirp, the wave, and the increase of the noise reference, which is used to adjust the complement of the sinusoidal signal portion of the tone and the missing harmonic wave, which is also in MPEG- 4 Efficient Advanced Audio Coding (HE-AAC) standard is described in the standard. In addition to this, another method uses a phase vocoder for bandwidth extension. When the phase vocoder for spectrum spreading is applied, the frequency lines further move away from each other. If, for example, by quantization, there is a gap in the spectrum, the transmission spread will even increase the gap. In energy adaptation, the remaining lines in the spectrum receive too much energy compared to the respective lines in the original signal. Figure 13 shows an overview of the bandwidth extension of a phase vocoder using 13 〇〇. In this example, two patches 1312, 1314 are added to the low frequency band 1302 of a signal. The upper cutoff frequency 1320 (crossover frequency) of the signal, also referred to as the frequency divider (Xover) frequency, is the low end frequency of the adjacent patch 1312, and twice the frequency of the divider is the upper cutoff frequency of the adjacent patch 1312 and The next cutoff frequency for the next patch 1314. The phase vocoder doubles the frequency of the frequency line in the low frequency band 1302 of the signal to obtain a neighboring patch ι 312, which triples the frequency of the frequency line in the low frequency band 1302 of the signal to obtain the next patch 1314 °. The spectral density of the adjacent patch 1312 is only half of the spectral density of the low frequency band 1302 of the signal, while the spectral density 5 201007708 of the next patch 1314 is only one third of the spectral density of the low frequency band 1302 of the signal. By concentrating the energy in the band (patch) to only a few frequency lines, the substantial change in the tone causes it to be different from the original. In the past, more energy in the frequency band (frequency line) was added to the lesser remaining. Some examples of phase vocoders and their applications are presented below: "Frederik Nagel and Sascha Disch, A Harmonic Bandwidth Extension Method for Audio Codecs" by ICASSP'09 with M·Puckette, "Phase-locked Vocoder," IEEE ASSP Conference on Applications of Signal Processing to Audio and Acoustics, Mohonk 1995 ' Robel, A.: Transient detection and preservation in the phase vocoder ; citeseer.ist.psu.edu/679246.html, Laroche L., Dolson M.: Improved phase Vocoder timescale modification of audio, IEEE Trans. Speech and Audio Processing 'Vol. 7, No. 3, pp. 323-332 and U.S. Patent 6,549, 878. A method for filling a gap is shown in WO 00/45379. It includes a method and apparatus for enhancing a signal source coding system using high frequency reconstruction. The application aims to solve the problem of insufficient noise components in the reconstructed high frequency band by adding adaptive noise references. Adding noise can fill the gap, but the audio quality or subjective quality may not be sufficiently increased.

C SUMMARY OF THE INVENTION The purpose of the present invention is to provide a concept of bandwidth extension of audio signals, which increases the subjective quality of the bandwidth extension signal. This object is achieved by the method of claim 10, the method of claim 11, and the method of claim 15 and claim 16, solve. An embodiment of the present invention provides an apparatus for generating a bandwidth extension signal from an input signal. The first frequency band of the input signal is represented by a first resolution data, and the second frequency band is represented by a second resolution data, the second resolution being lower than the first resolution. The device includes a patch generator and a combiner. The patch generator is configured to generate a first patch from a first frequency band of the input signal in accordance with a first patching algorithm and to be configured to generate a second patch from a first frequency band of the input signal in accordance with a second patching algorithm. The second patch generated according to the second patching algorithm has a higher spectral density than the first patch generated according to the first patching algorithm. The combiner is configured to combine the first patch, the second patch, and the first frequency band of the input signal to obtain a bandwidth extension signal. The means for generating the bandwidth extension signal is adapted to scale the input signal or to scale the first patch and the second patch according to the first patching algorithm and according to the second patching algorithm, whereby the bandwidth extension signal satisfies a spectral envelope criterion. Embodiments in accordance with the present invention are based on patches with low spectral density (which means, for example, compared to the low frequency band of the input signal, the patch contains gaps) and patches with high spectral density (which means, for example, with input signals) The low frequency band compares the 'the patch contains only little or no gaps' combination to extend the central idea of the frequency band of the input signal. Since the two patches are generated based on the input signal, the high frequency bandwidth extension of the low frequency band of the input signal may provide a good approximation of the original audio signal. In addition, the first and second patches may be scaled (by scaling the input signal) before or after generation to satisfy the spectral 7 201007708 spectral envelope criterion, since the spectral envelope of the original audio signal should be considered to be used to reconstruct the input signal. frequency band. In this way, the subjective quality or audio quality of the bandwidth extension signal may be significantly increased. In some embodiments in accordance with the invention, the first patching algorithm is a harmonic patching algorithm. In other words, the first patch is generated whereby only the frequency of an integer multiple of the frequency in the first frequency band of the input signal is included in the first patch. In addition, the second patching algorithm may be a hybrid patching algorithm. This means, for example, that a second patch can be generated whereby the second patch contains a frequency that is an integer multiple of the frequency in the first frequency band of the input signal and a frequency that is not an integer multiple of the frequency in the first frequency band of the input signal. Therefore, the spectral density of the second patch is higher than the spectral density of the first patch. By combining the first patch and the second patch, the missing frequency line of the first patch can be filled by the frequency line of the second patch. In this way, the gap in the harmonic bandwidth extension according to the first patching algorithm can be filled by the second patch, and the audio quality of the bandwidth extension signal can be significantly improved. Some embodiments in accordance with the present invention are related to an apparatus for providing a bandwidth reduction signal based on an input signal. The device includes a spectral envelope data determinator, a patch scaling control data generator, and an output interface. The spectral envelope data determinator is configured to determine spectral envelope data based on the high frequency band of the input signal. The patch scaling control data generator is configured to generate patch scaling control data for scaling the bandwidth reduction signal at the decoder side or for scaling the first patch and the second patch by the decoder The bandwidth extension signal produced by the decoder satisfies a spectral envelope criterion. The spectral envelope criterion is based on spectral envelope data. First supplement 201007708: generated according to the low-solution of the bandwidth minus reading number according to the first repair algorithm, and the first patch is generated from the low-band yield of the bandwidth reduction signal according to the second patching algorithm 2 according to the second patching algorithm The spectral density of the patch is higher than that of the first patch generated by a patching algorithm. The output interface group is combined with the low frequency band of the combined input signal, the spectrum envelope data, and the complement y-scale control material, which means that the bandwidth is reduced. Furthermore, the output interface is configured to provide bandwidth reduction signaling for transmission or health.

A further embodiment in accordance with the invention is associated with an audio signal comprising a first frequency band and a second frequency band. The first frequency band is represented by the first resolution data, and the second frequency band is represented by the second resolution (four). The second resolution is lower than the first resolution. The second resolution data is based on the second frequency band spectral profile data and the patch scaling control data of the first frequency band, and the patch scaling control data is used to scale the audio money in the decoding end or to decode the Wei shirt-patch and the first patch. The bandwidth extension signal generated by the decoder satisfies a spectrum and criteria. The spectral envelope criterion is based on spectral envelope data. The first patch is generated from the first frequency band of the audio signal according to the first patching algorithm and the first patch is generated from the first frequency band of the audio signal according to the second patching algorithm. The material density of the second patch generated according to the second patching algorithm is higher than the spectral density of the first patch generated according to the first patching algorithm. BRIEF DESCRIPTION OF THE DRAWINGS The embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein: FIG. 1 is a block diagram of an apparatus for generating a bandwidth extension signal from an input signal; 9 201007708 Figure 2a is a diagram Generating a summary of the first patch; Figure 2b is a schematic diagram showing the generation of the first and second patches; Figure 3a is a block diagram of one of the means for generating a bandwidth extension signal from the input signal; Is a schematic depiction of a clipped sinusoidal input signal; Figure 3c is a schematic representation of a half-wave rectified sinusoidal input signal; and Figure 3d is a schematic representation of a full-wave rectified sinusoidal input signal;

Figure 4 is a block diagram of an apparatus for generating a bandwidth extension signal from an input signal; Figure 5a is a schematic representation of a filter bank implementation of a phase vocoder; Figure 5b is a diagram of Figure 5a. Detailed description of the filter; Figure 5c is a schematic diagram for processing the amplitude signal and the frequency signal in the filter channel of Figure 5a; Figure 6 is a conversion implementation of a phase vocoder Outlined;

Figure 7 is a block diagram of an apparatus for generating a bandwidth extension signal from an input signal, and Figure 8 is a block diagram of an apparatus for generating a bandwidth extension signal from an input signal; Figure 9 is for generating from an input signal Block diagram of one of the bandwidth extension signals; Figure 10 is a block diagram of one of the means for providing a bandwidth reduction signal based on the input signal; Figure 11 is a method for generating a bandwidth extension signal from the input signal 10 201007708 Figure 12 is a flow diagram of a method for providing a bandwidth reduction signal based on an input signal; and Figure 13 is a schematic illustration of a known bandwidth extension algorithm. I: Embodiment 3 Hereinafter, the same reference numerals are partially used for articles and functional units having the same or similar functional characteristics, and the description thereof with respect to the drawings will also be applied to other drawings to reduce the description of the embodiments. Redundancy. 1 shows a block diagram of an apparatus 100 for generating a bandwidth extension signal 122 from an input signal 102, in accordance with an embodiment of the present invention. The first frequency band of the input signal 102 is represented by a first resolution data, and the second frequency band is represented by a second resolution data, the second resolution being lower than the first resolution. The device 100 includes a patch generator 110 coupled to a combiner 120. The patch generator 120 is configured to generate a first patch 112 from a first frequency band of the input signal 102 in accordance with a first patching algorithm and a second patch 114 from a first frequency band of the input signal 102 in accordance with a second patching algorithm. The second patch 114 generated according to the second patch algorithm has a higher spectral density than the first patch 112 generated according to the first patch algorithm. The combiner 120 combines the first patch 112, the second patch 114, and the first frequency band of the input signal 102 to obtain a bandwidth extension signal 122. Moreover, the apparatus 100 for generating the bandwidth extension signal 122 scales the input signal 102 or scales the first patch 112 and the second patch 114 according to the first patching algorithm and according to the second patching algorithm, whereby the bandwidth extension signal 122 satisfies a Spectrum envelope criteria. Spectral density means, for example, different frequencies or frequency lines in a frequency band 11 201007708

Density. For example, a frequency band from OHz to i 〇 kHz (including a frequency portion having frequencies of 4 kHz and 8 kHz) has a lower spectral density than the same frequency band including frequency portions having frequencies of 4 kHz, 6 kHz, 8 kHz, and 10 kHz. Because the spectral density of the first patch 112 is lower than the frequency of the second patch 114, the first patch 112 includes a gap compared to the first patch 114. Thus the second patch 114 can be used to fill these gaps. Since both patches are based on the first band of the input signal 1G2, both patches are related to the characteristics of the original signal corresponding to the input signal 102. Therefore, the more extended signal 122 may be a good approximation of the original signal' and the subjective quality or audio quality of the bandwidth extension signal 122 can be significantly improved by the concept of the job. In this way, more energy can be distributed between the remaining lines, and for example, unnatural sound can be avoided. For example, the first patching algorithm may be a __wave patching algorithm. g This patch generator 110 may generate a first patch 112 containing steps that are integer multiples of the frequency in the first frequency band of the input signal 102.

rate. The spectral bandwidth extension provides a good correlation to the pitch structure of the original signal, but this patching algorithm will leave the gap in the gap and can be filled by the second patch. For example, a second patching-mixing patching algorithm, which means that the complement generator (10) can generate a second socket 114 that contains an integer multiple of the # frequency in the first band of the round-in signal. The frequency (wave frequency) and the frequency (non-harmonic frequency) that is not an integer multiple of the frequency in the 'band' of the input signal iG2. Non-harmonic Used to fill the _ of the first patch 112. It is also possible to combine the entire second patch ▲ including the read wave frequency) with the first patch 112. In this example: 12 201007708 The amplification of the harmonic frequencies generated by combining the harmonic frequency portions of the first patch 112 and the second patch 114 can be considered by appropriately scaling the first patch 1丨2 and/or the second patch 114. . The first patch 112 and the second patch 114 contain at least partially the same frequency range. For example, the first patch 112 includes a frequency band that reaches 8 kHz from 4 kHz, and the second patch 114 includes a frequency band that reaches 10 kHz from 6 kHz. In some embodiments according to the present invention, the next cutoff of the frequency of the first patch is equal to the next cutoff of the frequency of the second patch, and an upper cutoff of the frequency of the first patch 112 is equal to an upper cutoff of the frequency of the second patch 114. . For example, both patches contain a band that reaches 8 kHz from 4 kHz. Figures 2a and 2b show a first patch 112 according to the first patching algorithm 212 and a second patch 114 according to the second patching algorithm 214. For better illustration, Figure 2a shows only the first patch 112, and Figure 2b shows the first patch 112 and the corresponding second patch 114. Figure 2a illustrates an example 200 of a first frequency band 202 of the input signal 102 and two first patches 112 generated in accordance with the first patching algorithm 212. In this example, the patch contains the same bandwidth as the first frequency band 202 of the input signal 102. The bandwidth can also be different. The upper cutoff frequency 220 of the first frequency band 202 of the input signal 102 is represented by the "Xover" frequency (crossover frequency). In the example shown in Figure 2a, the patch begins at a frequency equal to a multiple of the crossover frequency Xover 220. The frequency line in the first patch 112 is an integer multiple of the frequency line in the first frequency band 202 of the input signal 102 and may be generated, for example, by a phase vocoder. These first patches 112 contain a gap with respect to the missing frequency line as compared to the first frequency band 202 of the input signal 102. Figure 2b additionally shows an example of two corresponding second patches 114 13 201007708 250. These patches are generated according to the second patching algorithm 214 and contain harmonic and non-harmonic frequencies. Non-harmonic frequency lines can be used to fill the gaps in the first patch 112. The frequency lines in the second patch 114 can be generated, for example, by nonlinear distortion. In this way, the gap may not be arbitrarily filled, such as filling the gap with noise. The gap may be based on the first resolution data in the first frequency band of the input signal to be populated based on the original signal. The first frequency band of input § § 102 may represent, for example, the low frequency band of the original audio signal encoded at high resolution. The second frequency band of the input signal 1 可 2 may represent, for example, the high frequency band of the original audio signal, and may pass through one or more parameters such as spectral envelope data, noise data, and/or lost harmonic data at low resolution. Quantify. The original audio signal can be, for example, an audio signal that is recorded by the microphone prior to processing or encoding. Scaling the input signal according to the first patching algorithm and according to the second patching algorithm means that, for example, the input signal is scaled once according to the first patching algorithm before the first patch is generated, and then the first patch is based on the scaled input Signal generation, and the input signal is scaled according to a second patching algorithm before the second patch is generated, and then the second patch is generated based on the scaled round-in signal, thereby combining the first patch, the second patch, and After the first frequency band of the input signal, the bandwidth extension signal satisfies a spectral envelope criterion. Alternatively, the first patch and the second patch are scaled after they are generated' whereby the bandwidth extension signal also satisfies a spectral envelope criterion. Similarly, in combination with the scaling of the first patch and the second patch, it is possible to scale the input signal according to the first patching algorithm and according to the second patching algorithm. Combiner 120 can be, for example, an adder, and bandwidth extension signal 122 201007708

May be the weighted sum of the first patch 112. The first frequency/satisfaction-envelope-envelope criterion of the second patch 114 and the input signal 1〇2 means that, for example, the spectrum packet of the bandwidth extension signal is based on the spectral envelope data contained in the input number. The spectral envelope data may be generated by an encoder and may represent a second frequency band of the original signal. The spectral envelope of the spread signal in this way may be a good approximation of the spectral envelope of the original signal. Apparatus 100 may also include a core decoder for decoding the first frequency band of input signal 1G2. The T-generation H 110 and the combiner (3) may be, for example, a portion specially designed for hardware or a processor or a microcontroller, or may be a computer program that is configured to execute on a computer or micro-controller. The device excitation can be part of a decoder or audio decoder. Figure 3a shows a block diagram of an apparatus 300 for generating a bandwidth extension signal 122 from an input signal 102, in accordance with an embodiment of the present invention. In this example, the patch generator 11A includes a phase vocoder 310 for generating the first patch 112 and an amplitude clipper 320 for generating the second patch 114. The phase vocoder 31 and the amplitude clipper 32 are connected to the combiner 12A. The phase vocoder 31 〇 expands the first frequency band of the input audio signal 1 〇 2 to produce a first patch 112 containing harmonic frequencies. In a non-linear processing step, the amplitude clipper 320 can clip the input signal 1〇2 to produce a second patch 114 containing harmonic and non-harmonic frequencies. As an alternative to the amplitude clipper 320, a half-wave rectifier, full-wave rectifier, mixer or diode similarly used in the quadratic region of the characteristic curve can be used to generate a nonlinearity based on the input signal 102 by a non-linearity 15 201007708 step. Non-wave frequencies. Figures 3b, 3c, and 3d show examples of clipped and/or rectified input signals 102 used to generate non-spectral frequencies. Figure 3b shows a summary 350 of the clipped sinusoidal input signal 1〇2. By clipping the signal, discontinuities in the form of abrupt changes in signal slope 380 are generated, and harmonic and non-harmonic portions having higher frequencies are generated. Optionally, Figure 3c shows a schematic depiction 360 of a half-wave rectified sinusoidal input signal 102 that also produces a discontinuous point 38〇. Furthermore, a combination of clipping and rectification is possible. Figure 3d shows a summary depiction 370 of one of the different discontinuities 380 and the full-wave rectified sinusoidal input signal 1〇2. ^ By clipping and/or rectifying or applying other methods of non-linear processing that produce discontinuous points 380, a wide spectrum of different frequencies can be generated. Therefore, patches generated according to this patching algorithm can include a high spectral density. Figure 4 shows a block diagram of an apparatus 400 for generating a bandwidth extension signal 122 from an input signal 102, in accordance with an embodiment of the present invention. This device 400 is similar to the device shown in Figure 3a, but additionally includes a frequency ® line selector 410. Phase vocoder 310 and amplitude clipper 320 are coupled to spectral line selector 410, which is coupled to combiner 120. The spectral line selector 410 can select a plurality of frequency lines in the second patch 114 to obtain a modified second patch 414 that is complementary to the first patch. If the corresponding frequency line in the first patch 112 is lost, the frequency line in the second patch 114 can be selected. In other words, the spectral line selector 410 selects the frequency line in the second patch 114 for filling the gap in the first patch 112, and can ignore the frequency of the second patch 114 included in the first patch 112 that has been wrapped 16 201007708 . In this manner, the modified second patch 414 can include a gap at the frequencies already included in the first patch 112. In this example, combiner 120 includes a first patch ^2, a modified second patch 414, and a first frequency band of input signal 102. The spectral line selection benefit 410 can be, for example, part of the patch generator no (as shown in Figure 4) or a separate unit. In the following, with reference to Figures 5 and 6, possible implementations of phase vocoder 310 in accordance with the present invention are illustrated. Figure 5a shows a filter bank implementation of a phase vocoder. One of the audio signals is clocked to an input 500 and obtained at an output 510. In particular, each channel in the summary filter bank illustrated in Figure 5a includes a bandpass filter 501 and a downstream oscillator 502. The output signals from all of the oscillators of each channel are combined by a combiner that is implemented, for example, as an adder and indicated at 503 to obtain an output signal. Each filter 5〇1 is implemented whereby it provides an amplitude signal on the one hand and a frequency signal on the other. The amplitude signal and the frequency signal are time signals indicating the evolution of the amplitude in the filter 5〇1 with time, and the frequency signal represents the development of the frequency of the signal filtered by the filter 501. The outline of the chopper 501 is shown in Figure 5b. Each of the filters 501 in Fig. 5a can be set as in Fig. 5b, however, only the frequency supplied from the two input mixers 551 and the adder 552 is different from the channel to the channel. The two output signals of the mixer of the mixer 551 are both filtered by the low pass filter 553 'where the low pass signals are different because they are phase shifted by 90 from 17 201007708. The local oscillator frequency (LO frequency) is generated. The higher low pass filter 553 provides a quadrature signal 554 and the lower filter 553 provides an in-phase signal 555. These two signals (i.e., Q and 〖) are provided to a scale converter 556 that produces a magnitude phase representation from a right angle representation. The amplitude or amplitude signals in Figure 5a are output at output 557, respectively, over time. The phase signal is provided to a phase unwrapper 558. At the output end of element 558 there is no longer a phase value typically between 〇 and 360°, and there is a linearly increasing phase value. This "unwrapped" phase value is provided to a phase/frequency converter 559 which can be implemented, for example, as a simple parametric phase difference 5 voltameter 'the phase difference δ ten calculation| § subtracting the phase of a previous time point from the phase at a current time point to obtain the frequency value at the current time point, or any other means for obtaining an approximation of the phase variation. This frequency value is applied to the constant frequency value & in filter channel 1 to obtain a time varying frequency at output 56. The frequency value at the output 56〇 has a DC component and an AC component = the current frequency of the signal in the filter channel deviates from the average-frequency frequency offset.

Therefore, as depicted in Figures 5a and 5b, phase exhaustion n Q separates the spectral information from the temporal information. The spectrum information is included in the specific pass = or frequency 0, which provides the DC portion of the frequency per channel, while the 1 民 刀 is not included in the frequency offset or the evolution of the time lapse of the 5C The figure shows a process according to the invention, which is performed for generating a 'specially used phase vocoder (10) to generate a first patch and inserted in more detail in the dashed position of the circuit depicted in the fifth. 18 201007708 For time scaling, for example, the amplitude signal A(t) in each channel or the frequency of the signal f(t) in each channel can be down or interpolated. In order to achieve the transposition purpose, as it is useful for the present invention, an interpolation (and time extension or extension of signals A(1) and f(t)) is performed to obtain spread signals A, (1) and f(1), where the interpolation is spread factor 598 control. For example, the spreading factor can be selected 'by this phase vocoder to generate the wave frequencies. Through the interpolation of the phase change, that is, the value before the constant frequency is added through the adder 552, the frequency of each of the vibrators 5〇2 in Fig. 5a is not changed. However, the time change of the total audio signal is slowed down by a factor of two. The result is a one-time extended pitch with the original patch', the original fundamental wave with its harmonics. By performing the signal processing illustrated in Figure 5c, the audio signal can be reduced back to its original period, e.g., by a factor of 2 down-conversion, and all frequencies are simultaneously doubled. This results in a factor 2 patch transpose, however, where 'an audio signal is obtained, the audio signal has the same length (i.e., the same number of samples) as the original audio signal. Φ As an alternative to the implementation of the filter bank shown in 5a®, the phase vocoder conversion implementation can also be used as described in Figure 6. Here, the audio signal 698 is fed to an FFT processor, or more generally, a short time Fourier transform (STFT) processor 6 作为 as a time sample sequence. The FFT processor_ is implemented to perform time-windowing of the audio signal for subsequent calculation of the amplitude spectrum and phase repetition through subsequent FFTs, wherein this calculation is performed for successive frequencies, the continuous frequency ^ Associated with strongly overlapping audio signal blocks.曰 In an extreme case, for each new audio signal sample, the new frequency 19 201007708 spectrum can be calculated 'where - the new spectrum can also be calculated for each of the twentieth new samples. The distance 'a of the samples between the two spectra is preferably given by controller 602. The controller 〇2 is further implemented to feed a bribe processor. The IFFT processor 〇4 is implemented to operate in an overlap-and-add operation. In particular, the 'IFFT processor 〇4 is implemented, whereby it performs a short-time Fourier inverse conversion by performing an IFFT on each spectrum based on an amplitude spectrum and a phase spectrum, and then performs an overlap-and-add operation to obtain The generated time signal. The overlap-and-add operation is assembled to eliminate the block effect caused by the analysis window. The time spread of the time signal is greater than the distance 'b between the two spectra when processed by the 11?1^ processor 6〇4. This is achieved by generating the distance a between the spectra of the FFT spectrum. The basic idea is to extend the audio signal by an inverse FFT that is only further separated by the analysis FFT. Therefore, the spectral change in the synthesized audio signal occurs more slowly than in the original audio signal.

However, if there is no phase rescaling in block 606, this will result in a frequency artifact. For example, when 45. When a single frequency window in which the continuous phase value is implemented is considered, this means that the phase of the signal of the -filtered || tissue is increased at a rate of 1/8 G period, and is 45 per time interval. Where the time interval is the time interval between consecutive FFTs. If the inverse FFTs are now separated from each other far away, this means 45. The phase increase occurs across a longer time interval. This means that the frequency of this signal portion is accidentally modified. To overcome this artifact, the phase is rescaled by exactly the same factor, by which the audio signal is spread over time. The phase of each FFT spectral value is therefore increased by a factor b/a, whereby accidental frequency modifications are eliminated. 20 201007708 Although in the embodiment illustrated in Figure 5c, the interpolation of the extended transmission amplitude/frequency control signal is implemented for a signal oscillator in the embodiment of the wave filter set of Figure 5a. , but the extension in Figure 6 is achieved by the distance between the two 11?17-but spectra of the distance between the two FFT spectra (ie, 'b' is greater than 'a'), however, in order to prevent artificial factors The phase rescaling is performed according to the ratio 'b/a'. For example, the distance 'b can be selected, whereby the phase vocoder produces a harmonic frequency. Figure 7 shows a block diagram of a device 7 for generating a bandwidth extension signal 122 from an input signal 102, in accordance with an embodiment of the present invention. The device 700 is similar to the device shown in Figure 1, but includes a power controller 710, a first power adjustment device 720, and a second power adjustment device 730. The power controller 710 is coupled to the first power adjustment device 72 and the second power adjustment device 730. The first power adjustment device 72A and the second power adjustment device 73A are connected to the patch generator 110. The power controller 71 can control the scaling of the input signals according to the first and second patching algorithms based on the spectral envelope data contained in the input signal and based on the patch scaling control information contained in the input signal. Alternatively, instead of the patch scaling control data contained in the input signal, at least one of the stored patch scaling control parameters can be used. The patch scaling control parameter may be supplemented by a scaling control parameter memory store, which may be part of the power controller 71 or a separate unit. The first power adjustment means 72 can scale the input signal 102' according to the first patching algorithm and the second power adjustment means 73() can scale the input k number 102 according to the second patching algorithm. In other words, the input signal 1 〇 2 can be pre-processed whereby the first and second patches can be generated whereby the bandwidth extension signal is full 21 201007708 full spectrum envelope criterion. To this end, the spectrum envelope data may define a spectrum envelope of the bandwidth extension signal 122, and the patch scaling control data or the patch scaling control parameter may set a ratio between the first patch 112 and the second patch 114, or may set the first patch 112 and / or the absolute value of the second patch 114. As shown in Figure 7, the first power adjustment device 720 and the second power adjustment device 730 can be part of a power controller 710 or a separate unit. As also shown in Figure 7, power controller 710 can be part of patch generator no or a separate unit. Power conditioning devices 720, 730 can be, for example, amplifiers or filters that are controlled by power controller 710. ❿ Selectively 'scaling' is done after the patch is generated. Suitably, Figure 8 shows a block diagram of an apparatus 800 for generating a bandwidth extension signal 122 from an input signal 1 〇 2 in accordance with an embodiment of the present invention. The device 8 is similar to the device shown in Fig. 7, but the power adjusting devices 720, 73 are disposed between the patch generator 11 and the combiner 12A. In this example, the patch generator 110 is connected to the first power adjustment device 72 and to the second power adjustment device 73. The first power adjustment device 72A and the second power adjustment device 730 are connected to the combiner 12A. In this manner, the first patch 112 can be scaled by the first power adjustment device 72 according to the first patching algorithm, and the second patch 114 can be scaled by the second power adjustment device 730 according to the second patching algorithm. The power adjustment means are again controlled by the power controller 710 based on the spectral envelope data and the patch scaling control data or the patch scaling control parameters as previously described. Alternatively, only one of the two patches can be scaled or power adjusted, and then combined with the combination of the patch and the zoom by the combiner 120 before combining the combined patch with the first band of the input signal 1〇2, 201007708 The patch is the town. In the fifth case, the first patch can be scaled to achieve a predefined ratio between the two patches (eg, based on patch scaling control data), and then the combined patches are scaled (eg, based on spectral envelope data) to meet the spectrum. Envelope criteria. The patch scaling control data may include, for example, a simple factor or a plurality of parameters for power distribution scaling. The patch scaling control data may refer to, for example, a _ power ratio between a first patch and a second patch on all second frequency bands or all high frequency bands or a third patch on all second frequency bands or all high frequency bands and/or Or the absolute value of the power of the second patch and may be represented by at least one parameter. Alternatively, for each of the plurality of sub-bands that together comprise the second or high frequency band, the patch scaling data includes a factor, such as spectral envelope data similar to each sub-band in the spectral bandwidth replication application. Optional. Optionally, the patch scaling data also indicates the filter's conversion function. For example, the parameter in the conversion function of the filter for scaling the first patch and/or the parameter ^ in the conversion function of the waver for scaling the first patch are included in the input k number. In this way, the parameters can represent a frequency function. Another alternative may be a patch scaling control parameter that represents a differential function of the first patch and the second patch. According to this embodiment, the scaling of the input signal or the scaling of the first patch and the second patch may be based on patch scaling control data including at least one parameter. Figure 9 shows a block diagram of an apparatus 900 for generating a bandwidth extension signal 122 from an input signal 102, in accordance with an embodiment of the present invention. The device 900 is similar to the device shown in FIG. 8, but additionally includes a noise adder 910, a lost harmonic adder 920, a noise power adjustment device 23 201007708 940, and a lost harmonic power adjustment. Device 950. The noise adder 910 is connected to the noise power adjustment device 940, and the noise power adjustment device 940 is connected to the combiner 120°. The loss harmonic adder 920 is connected to the lost harmonic power adjustment device 950 'Lost harmonic power adjustment device 95〇 Connected to the combiner 12〇. Furthermore, the power controller 710 is connected to the noise power adjustment device 94 and the lost harmonic power adjustment device 950. The noise adder 910 can generate a noise patch 912 based on the noise information contained in the input signal 1〇2. The noise patch 912 can be scaled by the noise power adjustment device 940. The power controller 710 can control the noise power adjustment device 94 based on the spectral envelope data and the reference or noise scaling data contained in the input signal 102. In this way, the noise of the original signal can be approximated to improve the audio quality of the bandwidth extension signal. The lost wave adder 920 can generate a missing harmonic patch 922 based on the missing harmonic data contained in the input signal. The lost harmonic patch 922 can include wave frequencies 'the harmonic frequencies can occur only in the high frequency band of the original signal'. Therefore, if only the low frequency band of the original signal of the first frequency band of the input signal 1〇2 is The available 'can't be reproduced. Loss of harmonic data provides information about these missing harmonics. The lost harmonic patch 922 can be scaled by the lost harmonic power adjustment device 950. The power controller 710 can control the lost harmonic power adjustment device 950 based on the spectral envelope data or based on the lost harmonic scaling data contained in the input signal 1〇2. The combiner 120 can combine the first patch 112, the second patch 114, the first frequency band of the input signal 102, the noise patch 912, and the lost harmonic patch 922 to obtain the bandwidth extension signal 122. The power controller 710 is combined with the power adjustment device. 24 201007708 The first patch 112, the second patch 114, the noise patch 912, and the missing harmonic patch 922 can be scaled based on the spectral envelope data, whereby the spectral envelope criteria are satisfied. Figure 10 shows a block diagram of an apparatus 1000 for providing a bandwidth reduction signal 1032 based on an input signal 1002, in accordance with an embodiment of the present invention. The apparatus 1000 includes a spectral envelope data determiner 1010, a patch scaling control data generator 1020, and an output interface 1030. The spectral envelope data determiner 1010 is coupled to the patch scale control data generator 1020 to the output interface 1030. The spectral envelope data determinator 1010 can determine the spectral envelope data 1012 based on a high frequency band of the input signal 10 〇 2 9 \ . The patch scaling control data generator 1020 can generate patch scaling control data 1102 for scaling the bandwidth reduction signal 1032 at the decoder side or for scaling the first patch and the second patch through the decoder. Thereby the bandwidth extension signal produced by the decoder satisfies a spectral envelope criterion. The spectral envelope criteria are based on spectral envelope data. The first patch is generated from the first frequency band of the bandwidth reduction signal 1032 according to the first patching algorithm, and the second patch is generated from the first frequency band of the bandwidth reduction signal 1032 according to the second patching algorithm. The second patch generated according to the second patch algorithm has a higher spectral density than the first patch generated according to the first patching algorithm. The output interface 1030 combines a low frequency band of the input signal 1002, the spectral envelope data 1012, and the patch scaling control data 1022 to obtain a bandwidth reduction signal 1032. Furthermore, the output interface 1030 provides a bandwidth reduction signal 1032 for transmission or storage. Apparatus 1000 may also include a core encoder for encoding the low frequency band of the input signal. The core encoder can be, for example, a differential encoder, a drop encoder or a perceptual audio encoder. 25 201007708 Edited by μ ‘cutting the turn# part of the payment. Patch Scale Control = Data can indicate, for example, the number of shirts on all high bands. The patch-to-control control-to-power ratio or the absolute value of the power of the first-complement τ and the first-patch on all high-bands and may be composed of at least τ&/or second complement, patch_inclusive :High =:= Multiple sub-frequency of one factor determined by each sub-band in the band

For example, it is similar to the spectral envelope data of the mother-subband in the spectrum bandwidth replication application. Alternatively, the patch scaling data may also indicate a filtered conversion function. For example, the parameters of the conversion wiper used to scale the filter H of the first complement T and/or the parameters in the filter function of the filter used to scale the second patch may be used by the mosquito to generate patch scale control data. In this manner, the parameter can generate a patch scaling control parameter that can generate a differential function representative of the first patch and the second patch based on the frequency function.补丁 Patch scaling control data 1022 can be generated by analyzing input signal 1〇〇2 and selecting patch scaling control parameters stored in the patch scaling control parameter memory based on analysis of input signal 1002 to obtain patch scaling control data 1022. Alternatively, the 'patch scaling control' > material 1 〇22 generation can be achieved by an analytical synthesis method. To this end, the patch scaling control data generator 1 〇 2 〇 may additionally include a patch generator (as described for the decoder) and a comparator. The patch generator may generate a first patch from the low frequency band of the input signal 1002 according to the first patching algorithm, and generate a second patch from the low frequency band of the access number 1002 according to the second patching algorithm. The second patch generated according to the second patching algorithm has a higher spectral density than the first patch generated according to the first patching algorithm. The comparator compares the first patch, the second patch, and the high frequency band of the input signal to obtain patch scaling control information 1022. In other words, the concept of narration is also applied to the device. In this manner, device 1000 can retrieve patch scaling control data 1022 by comparing patches or combined patches and input signals, which may be, for example, an original audio nickname. In addition, apparatus 1000 can also include a frequency beta line selector, a power controller, a noise adder, and/or a loss harmonic adder as previously described. In this way, noise data, noise patch scaling control data, lost harmonic data, and/or missing harmonic patch scaling control data can also be retrieved through an analytical synthesis method. Some embodiments in accordance with the present invention are associated with an audio signal comprising a first frequency band and a second frequency band. The first frequency band is represented by a first resolution data, and the second frequency band is represented by a second resolution data, wherein the second resolution is lower than the Qth resolution. The second resolution data is based on the spectral envelope data of the second frequency band and the patch scaling control data of the second frequency band, the patch scaling control data is used for scaling the audio signal at the decoder end or for scaling the first patch and the first through the decoder The second patch, whereby the bandwidth extension signal generated by the decoder satisfies a spectral envelope criterion. This spectral envelope criterion is based on spectral envelope data. The first patch is generated from the first frequency band of the audio signal according to the first patching algorithm and the second patch is generated from the first frequency band of the audio signal according to the second patching algorithm. The spectral density of the second patch generated according to the second patching algorithm is higher than the spectral density of the first patch generated according to the first patching algorithm. 27 201007708 Audio signals can reduce the signal based on, for example, the original audio signal. The first band of the audio signal may represent a low frequency band of the original audio signal encoded at high resolution. The second frequency band of the audio signal may represent a frequency band of the original audio signal and may be quantized by at least two parameters: a spectral envelope parameter represented by the spectral envelope data and a patch scaling control data table (4) - a patching control parameter . A decoder based on such an audio signal' based on the above concept can generate a bandwidth extension signal that provides a good approximation of the original audio message and has improved audio quality compared to known concepts. ® Figure 11 shows a flow chart of a method for generating a -bandwidth spread signal from an input signal in accordance with an embodiment of the present invention. The first frequency band of the input signal is represented by the first resolution data, and the second frequency band is represented by the second resolution data, and the second resolution is lower than the first resolution. The financial method 1100 includes the steps of: generating (10) a _ patch, generating 112 〇 a second patch, scaling a 1130 input 彳§ number or zooming 113 〇 a first patch and a second patch, and combining 114 〇 a first patch, a second patch, and an input The first frequency of the signal ▼ 'to obtain a bandwidth extension signal. The first patch generates 111〇 from the first frequency band of the input h number according to the first patching algorithm, and the second patch generates 112〇 from the first band of the input signal according to the second patching algorithm. According to the second patching and algorithm generation, the density of the patch (10) is higher than that of the first patch that generates 1U0 according to the first patching algorithm. The input signal may be scaled according to a first patching algorithm and according to a second patching algorithm, or the first patch and the second patch may be scaled 113' to thereby satisfy a spectral envelope criterion. 28 201007708 Again, method 1100 can be extended by the steps in accordance with the concepts above. Method 1100 can be implemented, for example, as a computer program for execution on a computer or microcontroller. Figure 12 shows a flow diagram of a method 1200 for providing a bandwidth reduction signal based on a round of human signals, in accordance with an embodiment of the present invention. The method 1200 includes the steps of: determining a 121 〇 spectral envelope data based on a high frequency band of the input signal, generating 1220 patch scaling control data, combining a low frequency band of the 1230 input signal, spectral envelope data, and patch scaling control data to obtain a bandwidth reduction The signal and the 1240 bandwidth reduction signal are provided for transmission or storage. The patch scaling control data is generated 1220 for scaling the bandwidth reduction signal at the decoder side or for scaling the first patch and the second patch by the decoder 'by which the bandwidth extension signal generated by the decoder satisfies a spectral envelope Guidelines. The spectral envelope criterion is based on the spectral envelope data. The first patch is generated from a low frequency band of the bandwidth reduction signal according to the first patching algorithm' and the second patch is generated from the low frequency band of the bandwidth reduction signal according to the second patching algorithm. The spectral density of the second patch generated according to the second patching algorithm is greater than the spectral density of the first patch generated according to the first patching algorithm. Further, the method 1200 can be extended by the steps according to the above concept. Method 1200 can be implemented, for example, as a computer program for execution on a computer or microcontroller. Some embodiments in accordance with the present invention are related to an apparatus for generating a bandwidth extension signal using a phase vocoder for bandwidth extension in combination with nonlinear distortion or noise filling for a denser spectrum . 29 201007708 When a phase vocoder for bandwidth expansion is applied, the frequency line is further away. If, for example, the _ towel exists in the _, the financial expansion is equal to the gap = even increased. The remaining lines in the spectrum in the energy adaptation receive too much energy. This is avoided by filling the gap with noise or another harmonic, which may be obtained by nonlinear distortion of the signal. Such more energy may be distributed between the remaining lines. Unnatural or metallic sounds are produced by concentrating the energy in the frequency band to only a few frequency lines. In the past, the energy in more bands was added to the rest.

If there is no gap in the spectrum, but at least the noise is present, then some of the energy remains in the noise reference. By applying nonlinear distortion, the spectrum can be increased in density again, on the one hand, through the noise generated by the distortion, and on the other hand, through the appropriate selection of the other parts of the wave that are introduced by the *true signal portion. The bandwidth extension signal can therefore be, for example, a weighted sum of a filtered distortion signal and one of the signals produced with the help of the phase vocoder. In other words, the bandwidth extension signal can be the weighted sum of the first patch, the second complement τ, and the wheel signal: the frequency band. Some embodiments in accordance with the present invention are related to the application of all audio 1 application concepts where not all of the bandwidth is available in the audio applications. For example, for the use of digital radio services, Internet streaming or other audio communication applications can be applied. </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; By way of description, but it should be noted that 30 201007708 there are many alternative ways of implementing the method and composition of the present invention. It is therefore intended that the appended claims be interpreted as

In particular, it is pointed out that the solution of the invention can also be implemented in software depending on the situation. The implementation may be on a digital storage medium, in particular a floppy disk or a CD having an electrically readable control signal, wherein the electrically smear control signals can cooperate with a programmable computer system, whereby corresponding The method is executed. In general, the present invention is also embodied in a computer program product having a deliberately stored computer program product stored on a machine readable carrier for execution on a computer. The method of the invention is carried out. In other words, the present invention can thus also be embodied as a computer program having a (four) code for performing the method when the computer program product is executed on a computer. [Simple Description] The first block is a block diagram of the device for generating a bandwidth extension signal from the wheeled signal; the second block is a summary of the generated first patch; the second block is - the generated A summary of the first and second patches; Figure 3a is a block diagram for generating a bandwidth extension signal from the input (4); Figure 3b is a schematic representation of the sinusoidal input signal; = Figure is - half-wave A schematic diagram of the rectified sinusoidal human signal; ^ is a graph of the sinusoidal sinusoidal _ summary; 4 is a block diagram of the device 31 201007708 for generating a bandwidth extension signal from the input signal, 5a The figure is a schematic diagram of a filter bank implementation of a phase vocoder; Figure 5b is a detailed depiction of the filter in Figure 5a; Figure 5c is a filter used to process a filter in Figure 5a A schematic diagram of the amplitude signal and the frequency signal in the channel; FIG. 6 is a schematic diagram showing a conversion implementation of a phase vocoder;

Figure 7 is a block diagram of an apparatus for generating a bandwidth extension signal from an input signal, and Figure 8 is a block diagram of an apparatus for generating a bandwidth extension signal from an input signal; Figure 9 is for generating from an input signal a block diagram of one of the bandwidth extension signals, and FIG. 10 is a block diagram of an apparatus for providing a bandwidth reduction signal based on the input signal;

Figure 11 is a flow chart of a method for generating a bandwidth extension signal from an input signal, and Figure 12 is a flow chart of a method for providing a bandwidth reduction signal based on an input signal; and Figure 13 is a known bandwidth A summary of the extended algorithm. [Description of main component symbols] 102.. Input signal 1312, 1314··. Patch 110.. Patch generator 120... Combiner 112, 114, 414, 200, 250, 122... Bandwidth extension signal 32 201007708

202.. . Band 212, 214... patching algorithm 220, 1320.. cutoff frequency / X〇ver 100, 300, 400, 700, 800, 900, 1000... device 310.. phase vocoder 320 .. Amplitude Clipper 350... Clip Sine Input Signal 360... Half Wave Rectified Sinusoidal Input Signal 370... Clipped and Full Wave Rectified Sinusoidal Input Signal 380.. Discontinuity Point 410.. Spectrum Line Selector 500.. . Input 501.. Bandpass Filter 502.. Downstream Oscillator 503, 552... Adder 510, 557, 560... Round Out End 551.. Input Mixer 553.. Low Pass Filter 554 ... quadrature signal 555... in-phase signal 556.. coordinate converter 558.. phase unwinder 559... phase/frequency converter 598.. expansion factor 600... short time Fourier transform (SXFT) processor 602. . controller 604..1. FT processor 606...block 698...audio signal 710...power controller 720,730...power adjustment device 910...noise adder 912...noise patch 920···loss of harmonics Adder 922.. Lost Harmonic Patch 940··· Noise Power Adjustment Device 950... Lost Harmonic Power Adjustment Device 1002.. Bandwidth Reduction Signal 1010.. Spectrum Envelope Data Determinator 1012.. Spectrum Envelope Data 1020.. Patch Zoom Control Data Generator 1022.. Patch Zoom Control Data 1030.. Output Interface 1032.. Bandwidth Reduction Signal 33 201007708 1100, 1200 ...method 1302···the low frequency band of the signal 1110~1140, 1210~1240...flow step 1300...bandwidth expansion

34

Claims (1)

201007708 VII. Patent Application Range: 1. A device for generating a bandwidth extension signal from an input signal, wherein a first frequency band of the input signal is represented by a first demodulation data, and a second frequency band is represented by a The second resolution data indicates that the second resolution is lower than the first resolution, and the device includes: a patch generator configured to generate a first patch from the first frequency band of the input signal according to a first patching algorithm, and to be configured to receive the first signal from the input signal according to a second patching algorithm Generating a second patch in a frequency band, wherein a spectral density of the first patch generated according to the second patching algorithm is higher than a spectral density of the first patch generated according to the first patching algorithm; and a combiner, Composing to combine the first patch, the second patch, and the first frequency band of the input signal to obtain the bandwidth extension signal, wherein the apparatus for generating a bandwidth extension signal is configured to be adapted according to the #演算法 and scaling the input signal or scaling the first patch and the second patch according to the second patching algorithm, whereby the bandwidth extension signal satisfies the -spectral envelope criterion. 2. The device of claim 1, wherein the first patching algorithm is a Μ patching algorithm, and the patch generator is assembled to produce a 'first patch' whereby the first frequency band of the input signal is only The frequency of the integer frequency is included in the first patch. 3. The apparatus of claim 1 or 2, wherein the second patching algorithm is a one-in-one patching algorithm, and the patch generator is assembled to generate the second address And the second patch includes a frequency that is an integer multiple of the frequency in the first frequency band of the input signal 35 201007708 and includes a frequency that is not an integer multiple of the frequency in the first frequency band of the input signal . The device according to any one of the preceding claims, wherein the first cutoff frequency of the first patch is equal to the next cutoff frequency of the second patch and wherein the first patch is uploaded The stop frequency is equal to an upper cutoff frequency of the first patch. 5. The apparatus of any one of claims 1-4, comprising a phase vocoder that is configured to generate the first patch according to the first patching algorithm. 6. The apparatus of any one of clauses 5 to 5, comprising: the first frequency band that is assembled to sculpt the input signal and generated according to the second patching algorithm An amplitude clipper for the second patch. The apparatus of any one of clauses 1 to 6, wherein the apparatus includes a frequency spectrum that is selected to select a plurality of frequency lines in the second patch to obtain a modified second patch. a line selector, wherein if a corresponding frequency line in the first patch is lost, a frequency line is selected, wherein the combiner is configured to combine the first patch, the modified second patch, and the input signal The first frequency band. 8. The apparatus of any one of clauses 7 to 7, comprising the scaling action or grouping of the input signal to be controlled in accordance with the first and second patching algorithms And a power controller for controlling the scaling action of the first patch and the first patch, wherein the power controller is based on the spectral envelope data included in the input signal and the at least one stored patch is scaled The control parameter or the patch scaling control data contained in the input signal controls the scaling action. 9. The device of claim 8, comprising a first power adjustment device that is configured to scale the input signal or scale the first patch according to the first patching algorithm, and includes a combination a second power adjustment device that scales the input signal or scales the second patch according to the second patching algorithm, wherein the power controller is configured to control the first power adjustment device and the second power adjustment device . 10. The device of claim 8 or claim 9, comprising a hybrid adder and a lost harmonic adder, wherein the noise adder is assembled to be included based on the input signal A noise data generates a noise patch, wherein the lost harmonic adder is configured to generate a *-harmonic patch based on a *-harmonic data included in the input signal', wherein the power controller is subjected to Combining a scaling action based on the spectral envelope data to control the noise patch and the missing (four) patch and the towel is combined to be combined to combine the first patch, the second patch, and the input signal - the frequency band, the noise patch and the lost harmonic shot to obtain the bandwidth extension Cheng's towel, the fresh control is based on the Lai envelope data control like the Ding, the second supplement, the noise patch and the loss This scaling action of the wave patches thereby satisfies the spectral envelope criteria. 11. Apparatus for providing a bandwidth-reduced signal based on an input signal, comprising: a spectral envelope data determinator, configured to determine a spectral envelope data based on a frequency band of the input signal, 37 201007708 a patch A scaling control data generator configured to generate a patch scaling control data for scaling the bandwidth reduction signal at a decoder side or for scaling the first patch and the second patch through the decoder The bandwidth extension signal generated by the decoder satisfies a spectral envelope criterion, wherein the spectrum envelope criterion is based on the spectrum envelope data 'where the first patch reduces the signal from the bandwidth according to the first patching algorithm a first frequency band is generated, and the second patch is generated from the first frequency band of the bandwidth reduction signal according to a second patching algorithm, wherein a spectral density of the second patch generated according to the second patching algorithm is The first patch generated by the first patching algorithm has a high spectral density; an output interface is assembled to combine the input signals Low frequency band, the spectral envelope data and the patch scaling control data to obtain the bandwidth reduced signal 'and the output interface to provide together with the group receiving the said bandwidth reduction 4s for transfer or storage wheel. 12. The apparatus of claim 5, wherein the patch scaling control data generator comprises: the patch generator being configured to generate a first frequency from the low frequency band of the input signal according to a first patching algorithm a patch 'and is configured to generate a second patch from the low frequency band of the input signal according to a second patching algorithm, wherein a spectral density of the second patch generated according to the second patching algorithm is a spectrally high density of the first patch generated by a patching algorithm; and a comparator configured to compare the first patch, the second patch 201007708 with the high frequency band of the input signal to obtain the patch scaling Control data. 13. The device of claim 11, comprising a patch scaling control parameter memory that is configured to store and provide a plurality of patch scaling control parameters, wherein the patch scaling control data generator is configured to The input data is analyzed and assembled to generate the patch scaling control data based on the stored patch scaling control parameters selected based on the analysis of the input data. 14. An audio signal, comprising: a first frequency band represented by a first resolution data; and a second frequency band represented by a second resolution data, wherein the second resolution is lower than the first resolution Degree, wherein the second resolution data is based on spectral envelope data of the second frequency band and patch scaling control data based on the second frequency band, the patch scaling control data is used to scale the audio signal at a decoder end or used for And scaling, by the decoder, a first patch and a second patch, wherein a bandwidth extension signal generated by the decoder satisfies a spectral envelope criterion, wherein the spectrum envelope criterion is based on the spectrum envelope data, wherein the first The patch is generated from the first frequency band of the audio signal according to a first patching algorithm, and the second patch is generated from the first frequency band of the audio signal according to a second patching algorithm, wherein the second patching algorithm is generated according to the second patching algorithm The generated second patch has a spectral density that is higher than a spectral density of the first patch generated according to the first patching algorithm. 15. A method for generating a bandwidth extension signal from an input signal, wherein in 39 201007708 a first frequency band of the input signal is represented by a first resolution data and a second frequency band is represented by a second resolution The data indicates that the second resolution is lower than the first resolution, and the method includes the following steps: generating a first patch from the first frequency band of the input signal according to a first patching algorithm; according to a second patching algorithm The method generates a second patch from the first frequency band of the input signal, wherein a spectrum density of the second patch generated according to the second patching algorithm is greater than one of the first patches generated according to the first patching algorithm The spectral density is high; scaling the input signal according to the first patching algorithm and according to the second patching algorithm, or scaling the first patch and the second patch, whereby the bandwidth extension signal satisfies the spectrum envelope criterion; and combining The first patch, the second patch, and the first frequency band of the input signal to obtain the bandwidth extension signal. 16. A method for providing a bandwidth reduction signal based on an input signal, comprising the steps of: determining a spectral envelope data based on a high frequency band of the input signal; generating patch scaling control data, the patch scaling control data Scale the bandwidth reduction signal at a decoder side or to scale a first patch and a second patch through the decoder, whereby a bandwidth extension signal generated by the decoder satisfies a spectral envelope criterion, wherein The spectral envelope criterion is based on the spectral envelope data, wherein the first patch is generated from a first frequency band of the bandwidth reduction signal according to a first patching algorithm, and the second patch is from the bandwidth according to a second patching algorithm. Reducing the first frequency band of the letter 201007708, wherein a spectral density of the second patch generated according to the second patching algorithm is higher than a spectral density of the first patch generated according to the first patching algorithm; Combining a low frequency band of the input signal, the spectrum envelope data, and the patch scaling control data to obtain the bandwidth reduction signal This provides a bandwidth reduced signal for transmission or storage. 17. A computer program having a code for performing the method of claim 15 or claim 16 when the computer program is executed on a computer or a microcontroller. 41