EP1024679A2 - Procédé pour décoder des signaux radios perturbés dans des signaux audio multicanaux - Google Patents

Procédé pour décoder des signaux radios perturbés dans des signaux audio multicanaux Download PDF

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Publication number
EP1024679A2
EP1024679A2 EP99124194A EP99124194A EP1024679A2 EP 1024679 A2 EP1024679 A2 EP 1024679A2 EP 99124194 A EP99124194 A EP 99124194A EP 99124194 A EP99124194 A EP 99124194A EP 1024679 A2 EP1024679 A2 EP 1024679A2
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EP
European Patent Office
Prior art keywords
signal
channels
channel
different
parameters
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Granted
Application number
EP99124194A
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German (de)
English (en)
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EP1024679B1 (fr
EP1024679A3 (fr
Inventor
Gerhard Kottschlag
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1024679A3 publication Critical patent/EP1024679A3/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/07—Synergistic effects of band splitting and sub-band processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 

Definitions

  • the invention relates to a method for decoding multi-channel audio broadcasts, especially of two-channel stereo audio broadcasts a respective useful signal per channel, for each of the useful signals transmitted frequency spectrum of a signal source by different temporal occurrence and different levels in the different Channels a spatial impression or location information is generated for the corresponding signal source, according to the preamble of claim 1.
  • Radio receiver for multi-channel audio signals should with different signal levels, with level fluctuations of the high-frequency carrier signal and, in the case of radio interference, the low-frequency Play the (audio) original signal as realistically as possible.
  • This also includes the spatial arrangement of the different ones reproduced sound sources.
  • This spatial arrangement will hereinafter also referred to as location information.
  • a multi-channel audio broadcast especially two-channel stereo audio broadcasting is one of them a respective useful signal is provided per channel, for each of the frequency spectrum of a signal source transmitted to the useful signals due to different times and different levels in the different channels a spatial impression or location information is generated for the corresponding signal source.
  • some Reception situations deteriorate the audio quality of a Multi-channel signal, e.g.
  • the strategy described above is particularly promising if the single-channel signal obtained is due to the modulation method used a lower susceptibility to the mentioned interferences having. This is particularly the case with the widely used frequency modulated FM radio (multi-plex signal using the pilot tone method) the case.
  • Methods are also known for processing a mono signal in such a way that that the impression of a spatial distribution of the signal sources arises.
  • the mono signal is broken down into several frequency ranges. This Areas become different in strength and / or with different delays distributed over different audio signal paths (+ reverb or others known measures for producing an artificial surround effect).
  • always going on Splits ultimately lead to continuous functions for Attenuation-over-frequency and delay-over-frequency, each one separate function for each signal path. With discrete frequency ranges their width can be chosen differently, adapted to the Stereo sensitivity of the human ear at different frequencies (e.g. no channel separation for basses, narrow segments for approx. 1kHz, large segments at high frequencies).
  • Conventional stereo decoders are relatively simple and therefore inexpensive. So far with stereo receivers with such stereo decoders method used with mono stereo blend based, like previously explained, only on the control of the channel separation. At occurring faults are switched to single-channel operation very early, whereby any location information that may still be present is no longer reproduced becomes.
  • the known simple stereo decoders have noisy Stereo signals only the choice, the location information entirely or partially discard.
  • the location information is extracted from the useful signals and with this current location information from one the useful signals of all channels containing mono signal an artificial spatial sound by distributing different frequency bands to the number of channels of the multi-channel audio broadcast corresponding channels with different times Delay and / or different levels of attenuation in the different channels is generated.
  • spectral distributions of the Useful signals of the different channels and / or runtime differences or time differences of two or more different spectral components with each other in the respective useful signal of different channels compared.
  • the comparison is for each channel for at least two or more different spectral components parameters for signal attenuation and / or a signal delay is determined and the corresponding Spectral components from one containing the useful signals of all channels Single-channel signal delayed according to the specific parameters and / or damped corresponding to the number of channels of the multi-channel audio broadcast Channels distributed in such a way that for a listener for the corresponding Spectral components produce a spatial sound impression, which essentially a spatial sound impression of the directly reproduced Audio signals of the channels.
  • the Spectral range is divided into several predetermined spectral components, where frequencies of a spectral component when determining the parameters weighted differently.
  • the disturbing impression of a spatially jumping signal source reliably thereby avoided that the predetermined spectral components in the Frequency partially overlap and the frequencies of a spectral component lower in the overlap area to an adjacent spectral component be weighted.
  • the division of the spectral components is expedient depending on the analysis of the useful signals dynamically changed.
  • a message about predetermined ones is given as a weighting function Periods or a summary of a predetermined Period with greater consideration of younger certain parameters.
  • a good prediction of a future spatial location of a signal source is achieved in that for those spectral components in which a Determination of the parameters is not possible, these from neighboring Spectral components interpolated, certain parameters previously weighted if necessary further used, predetermined parameters or parameter functions used and / or random parameters are used.
  • a recipient of the above Type marked according to the invention by an analysis module, which spectral distributions of the useful signals the different channels and / or runtime differences or Transit time differences of two or more different spectral components in the respective useful signal of the different channels compares from the comparison for each channel for at least two or more different spectral components parameters for signal attenuation and / or a signal delay determined in this way, and a surround sound module , which the corresponding spectral components from a the useful signals of all channels containing single-channel signal according to the determined Parameters delayed and / or damped on the number of channels of the Multi-channel audio broadcast corresponding channels distributed such that a Listeners for the corresponding spectral components a spatial Sound impression, which is essentially a spatial Sound impression of the directly reproduced audio signals of the channels corresponds.
  • the analysis module for Each channel has a filter module that contains the respective useful signal or parts of the useful signal in several, in particular four spectral components disassembled.
  • the analysis module points for each spectral component to be evaluated a level detector and one of the number of these spectral components corresponding number of level comparators, each level comparator the levels of an assigned spectral component in several, if necessary compares all channels. Every level comparator is one Signal converter stage downstream, which results from the comparison in the level comparator for each channel of the artificial spatial sound the parameter for signal attenuation and / or the parameter for signal delay certainly.
  • the surround sound assembly has a filter assembly on which a mono signal containing the useful signals of all channels divided into several, in particular five, spectral components, whereby for at least one spectral component is one of the number to be processed Channels corresponding number of attenuator assemblies and / or Delay stages are provided, attenuator assemblies and / or delay stages in accordance with those for this channel and this Spectral component of parameters provided by the analysis module is delayed and / or generate damped output signal. For every channel of the artificial spatial sound, an adder combines the so obtained spectral partial signals.
  • a time offset between the segment of the multi-channel useful signal being analyzed and the segment of the Mono signal has the advantage that one only in the course of the signal segment clearly prominent spatial information even on the design of the spatial sound at the beginning of this signal segment.
  • Useful signals of different channels of the multi-channel audio signal analyzed for their spectral distribution By comparing the Analyzes of different channels determine which spectral components at which point in the room have their origin. This according to the invention determined data to describe the original signal are hereinafter referred to as "location information". While disturbed Reception times are switched to an artificial surround sound or faded out, which is based on the currently from the disturbed Merkanal signal determined location information is designed, that is Spectral components of the mono signal distributed over the different channels so that the impression arises that the spectral components still have theirs Origin at the location determined for this. After the end of the disturbance will be on Multi-channel operation switched back or blinded. The parameters like e.g.
  • Surround sound parameters can be identical to the location information.
  • the location information and / or surround parameters collect data Individual frequencies or the signal components in frequency ranges together.
  • the location information is recorded at certain times or for certain time intervals.
  • the determination of the location information of the multi-channel signal and / or the Surround sound parameters for designing the spatial sound are, for example as continuous functions of the level depending on the Frequency realized.
  • a continuous function of the level depending of the frequency prevents the impression of a fast Relocation of a signal source when the frequency of the source has a range limit exceeds.
  • the frequencies of a jointly processed area flow optionally with different weightings in the calculations (frequency-dependent Evaluation function).
  • the weighting can be in the location information be chosen differently than for the surround parameters. It will Parts of the spectrum examined or edited, which are clearly delineated are or partially overlap. In this for digital signal processing more suitable division into frequency ranges will be neighboring Frequencies recorded with lower weighting, so too here the disturbing impression of a jumping signal source is reliable is avoided.
  • the time difference the spectral components (transit time differences) in the different Channels according to the procedures described above in the location information accepted.
  • different useful signals e.g. rhythmic Pop music
  • location information that has been recorded is not replaced by the next Measurement replaced, but supplemented by a weighting function, e.g. Averaged over longer periods or with greater consideration the recent measurements summarized.
  • a weighting function e.g. Averaged over longer periods or with greater consideration the recent measurements summarized.
  • the analysis of which is insufficient information provides the required location information about the location of the signal origin or surround parameters from neighboring frequency ranges interpolated, previously determined values continue to be used (weighted if necessary), predefined values or functions are used (e.g. these gaps treated as mono, i.e. equally distributed across all channels) and / or (if necessary partially) replaced by random parameters.
  • predefined values or functions are used (e.g. these gaps treated as mono, i.e. equally distributed across all channels) and / or (if necessary partially) replaced by random parameters.
  • the reuse of the last parameters determined from usable signal components and the interpolation from neighboring frequency ranges often allow one good forecast of the future location of the signal source.
  • the division into frequency ranges are variable, for example designed, in particular they are based on the analysis of the useful signal dynamically changed. This procedure enables individual spectral focus of the useful signal as a whole to edit it prevents the splitting and spatial separation of such areas.
  • the useful signal analysis can be smaller for quiet passages Record signal amplitudes.
  • the timing behavior can better match the characteristics the current fault situation, e.g. Frequency of fading drops be adjusted.
  • the event of interference in the single-channel useful signal e.g. Noise
  • can be reacted individually e.g. Reduction of signal levels and / or the channel separation in the high frequency range, so that Noise components not in the one currently used for high-frequency reproduction Channel become particularly audible.
  • a complete multi-channel audio signal contains at any time or smallest time interval and for each individual frequency provides information about the location of the signal generation or via a spatial arrangement of different signal sources regarding a recording microphone and thus regarding the listener.
  • the human ear is unable to complete this wealth of information evaluate. Quickly switch from one channel to another do not usually occur and would otherwise be in full Speed not recorded by the ear.
  • the multi-channel audio signal for example, through noise components when the Signal that loses information, remains enough for a long time Remaining information left to give the ear an acceptable spatial impression to provide.
  • the invention uses this residual information to artificially to restore a spatial sound.
  • the information is still provided even during a fault obtained from the disturbed signal to create the "artificial" surround effect to design according to the currently transmitted location information.
  • the mono signal reaches the Speakers, which is subject to an artificial spatial sound. It there is a detection of those still present in the disturbed signal Location information even in times when the signal is so disturbed is that it is no longer suitable for multi-channel playback, but is not yet as badly disturbed as the location information would have been greatly distorted.
  • a reception quality is in each case on the horizontal axis 10 a multi-channel audio broadcast plotted normalized to one. With “1" the reception quality is optimal, whereas towards the origin of the coordinate system to the reception quality always subsides more strongly until there is no reception at "0".
  • On the respective vertical axis 12 is a channel separation (Fig. 1), a Time resolution (Fig. 2), frequency resolution (Fig. 3) and quality the reproduction of the current location information or the spatial sound plotted normalized to one.
  • the dashed line 14 shows the respective Characteristics of a conventional decoder with cross-fading from stereo to mono if signal interference occurs (mono-stereo blend).
  • the crossed, solid line 16 shows the respective characteristic when using the location information before the occurrence of a Disturbance and no further evaluation of the location information in the useful signal during the disturbance.
  • the solid line 18 shows the respective Characteristic when extracting the location information also from the disturbed Signal, according to the invention.
  • the location information or the location information can be distorted in three parameters be, namely in channel separation, time resolution and frequency resolution.
  • the channel separation (Fig. 1) corresponds to the spatial Separation of the signal sources.
  • the time resolution (FIG. 2) is shown, for example in the maximum speed at which a signal source changes their location.
  • the frequency resolution (Fig. 3) indicates to what extent frequency-similar signal sources localized at different locations can be.
  • the quality of the reproduction of location information (Fig. 4) is expressed simply the product of the three parameters. In This representation is initially ignored that the human Heard the parameters evaluated very differently, and this in turn the frequency, level and other parameters of the signal varies.
  • Figures 1 to 4 show basic for different decoding methods Relationships for the three parameters (Fig. 1 to 3) and the overall quality the reproduction (Fig. 4) depending on the quality of the received signal, which on the horizontal axis 10 in the previously described is applied.
  • This quality can be as S / N ratio can be plotted for other types of interference, such as Shrinkage or multipath reception could be a different scaling make sense.
  • Conventional stereo decoders are relatively simple and thus inexpensive.
  • the previously used with stereo receivers Mono-stereo blend method is based solely on control the channel separation, (line 14). In the event of malfunctions, it is right faded to single-channel operation early, the location information still available are no longer reproduced.
  • the method according to the invention uses as far as possible all those that are still present Information from (line 18).
  • a suitable mix of time and Frequency averaging is based on the resolving power of the human Hearing and the computing power of the signal processing modules.
  • the temporal resolution is initially due to the sluggishness cause hardly any audible loss of quality.
  • the abstract in frequency bands is noticeable in simple systems Falsifications of the location information (arrow 20, fine resolution requires great computing power). If the information content declines you have to further reduce one or both resolutions.
  • the channel separation is only withdrawn when the remaining information available in the signal is no longer sufficient for acceptable audio quality.
  • the Method is particularly suitable for decoding weak, but largely stable signals, i.e. below the "mono" level more conventional Decoder. This area of gain in location information shows Arrow 22.
  • FIG. 5 shows a section of a block diagram of an FM stereo broadcast receiver as a preferred embodiment for an inventive Receiver.
  • An antenna 1010 receives radio frequency signals from radio stations and routes them to a selection and demodulation assembly 1020.
  • this assembly 1020 the signal from a radio station is recorded and the modulation content extracted.
  • An output signal 1021 of this assembly 1020 is the sum signal both stereo channels L + R (left plus right).
  • Another output signal 1022 contains the difference signal of the two channels L-R.
  • a third output 1023 indicates to what extent the signal reception Is subject to interference, whether due to too little or too quickly fluctuating signal strength, multipath reception or other events.
  • the sum signal 1021 arrives at an assembly 1100 for generation an artificial spatial sound.
  • Both the sum signal 1021 and the difference signal 1022 is fed to a stereo decoder 1030, of the two output signals 1031 with the right channel R and 1032 with the left channel L. These two signals arrive an analysis module 1300 for determining the room parameters.
  • the Module 1300 is also connected to signal 1023.
  • the determined Room parameters for signal attenuation and signal delay are over multiple leads 1301 and 1302 to surround module 1100 passed on. There they serve as spatial sound parameters for realistic purposes Replica of the room sound.
  • FIG. 6 shows an exemplary embodiment for the surround module 1100.
  • the mono signal (L + R) 1021 is divided into five in a filter assembly 1110 spectral partial signals 1111 to 1115 decomposed, the highest frequency components are emitted via signal 1111, the lowest frequency via signal 1115.
  • Signal 1111 arrives at a first attenuator module 1121, then goes through a first delay stage 1131 and arrives at a first summing point or adder 1141
  • the second path carries the signal 1111 over a second attenuator module 1122 and a second delay stage 1132 to a second Summing point or adder 1142.
  • Signals 1112, 1113 and 1114 are each through two paths through the attenuators 1123 to 1128 and delay stages 1133 to 1138 to the summing points or adders 1141 and 1142.
  • Output lines 1143 and 1144 of the two summing points 1141, 1142 form the outputs of the block 1100 and thus lead to the signals 1101 and 1102.
  • the signal attenuation in the attenuators 1121 to 1128 and the throughput time of the delay stages 1131 to 1138 are via signal buses 1129 and 1139 controlled, which consist of eight lines, one line per module to be controlled. Because man is unable to find the place of origin of low or low frequency tones can be seen in signal division is not required in this frequency range.
  • the signal 1115 is therefore directly at the two summing points or adders 1141 and 1142 headed.
  • FIG. 7 shows an exemplary embodiment for the analysis module 1300.
  • the signals 1031 and 1032 coming from the stereo decoder 1030 for the right and left audio channels are in two filter assemblies 1310 and 1320 into four spectral partial signals 1311 to 1314 and 1321 to Disassembled in 1324, with the lowest ones that cannot be localized by human hearing Frequencies are not taken into account.
  • the amplitude of the Signal line 1311 with the highest frequency components of the right channel is determined with a level detector 1331.
  • a resulting signal 1351 reaches a level comparator 1371.
  • a signal conversion stage 1381 generates from the result the comparison four control signals 1401 to 1404 to control the attenuators 1123 to 1128 and delay stages 1133 to 1138 in the Surround module 1100. Corresponding signals and processing stages are available for the signals of the other three spectral components.
  • no filters 1310/1320 are used for individual frequency ranges, instead, a function of the level above the is determined for each channel Frequency, from this a list of a parameter set with characteristic frequencies and associated level values. The frequencies in between can be obtained, for example, by interpolation. Artificial for everyone The channel to be generated is used instead of the assembly 1100, for example an analog multi-stage filter, for example from operational amplifiers, controlled such that it matches the incoming mono signal of these functions / parameters.
  • the levels in the frequency subsegments are measured using a measured over a longer period of time and these courses, for example, in one Ring buffer stored and fed to a correlation stage.
  • This stage determined by various time shifts and subsequent Comparison of the channels for which time shift a pronounced Agreement is demonstrable. This time difference is called information about the origin of the signal used.
  • the one previously described simple level comparison can continue to take place, with a subsequent one Level decides which of the two localization strategies in in this case better information (more credible, more pronounced, constant or other criterion) and processed.
  • the won Location information is in the in assembly 1371 and corresponding Assemblies en low pass provided.
  • the frequency ranges generated in stages 1310 and 1320 are alternatively split into much finer frequency sub-spectra. All sub-spectra with low signal levels are discarded, the remaining parts added to signals that match those after the first Frequency division (e.g. 1311).
  • the levels in the frequency subsegments are in an alternative Embodiment measured over a longer period and this Gradients stored in a ring buffer. At the beginning of a malfunction a signal rise or fall from this record of the level curve calculated that for the duration of the disturbance in the surround parameters is incorporated.
  • the highest peaks in the Frequency spectrum determined. These are called the center frequencies of the filters 1110 used for spectral division.
  • the signal 1023 at the input of module 1040 is alternatively only in the switching direction from stereo to surround sound is switched through immediately.
  • Low pass led so that there is a delay and thus for the artificial duration is limited even at times of good reception Surround sound remains activated.
  • a delay element can be added, e.g. in form of digital FIFO memory.
  • this is the one on the antenna 1010 incoming signal sequence processed in the analysis module 1300, however, the results of the analysis affect a signal segment that was received earlier, according to the offset by the Time Delay.
  • One clearly worked out only in the course of the analysis Location information can thus be applied to the entire signal sequence from the beginning Act.
  • the time offset when fading from the artificial spatial sound to compensate for the reproduction of the original signals are also two inputs of the fade unit 1040, which the signals 1031 and 1031 lead to equip with delay stages of the same timing.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
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  • Stereophonic System (AREA)
EP19990124194 1999-01-12 1999-12-03 Procédé pour décoder des signaux radios perturbés dans des signaux audio multicanaux Expired - Lifetime EP1024679B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19900819 1999-01-12
DE1999100819 DE19900819A1 (de) 1999-01-12 1999-01-12 Verfahren zum Dekodieren gestörter Funksignale von Mehrkanal-Audiosendungen

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EP1024679A2 true EP1024679A2 (fr) 2000-08-02
EP1024679A3 EP1024679A3 (fr) 2006-10-04
EP1024679B1 EP1024679B1 (fr) 2008-08-20

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004093494A1 (fr) * 2003-04-17 2004-10-28 Koninklijke Philips Electronics N.V. Creation de signaux audio
CN1774956B (zh) * 2003-04-17 2011-10-05 皇家飞利浦电子股份有限公司 音频信号合成
RU2449387C2 (ru) * 2007-11-21 2012-04-27 ЭлДжи ЭЛЕКТРОНИКС ИНК. Способ и устройство для обработки сигнала
EP2265041B1 (fr) * 2003-04-30 2017-12-13 Dolby International AB Traitement avancé basé sur une batterie de filtres modulée de façon complexe et exponentielle et procédés de signalisation de temps adaptatifs

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9338552B2 (en) * 2014-05-09 2016-05-10 Trifield Ip, Llc Coinciding low and high frequency localization panning

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833715A (en) * 1987-03-06 1989-05-23 Alps Electric Co., Ltd. FM stereo receiver
DE4442147C2 (de) * 1994-11-26 2002-02-14 Harman Becker Automotive Sys Mobiler Rundfunkempfänger

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004093494A1 (fr) * 2003-04-17 2004-10-28 Koninklijke Philips Electronics N.V. Creation de signaux audio
CN1774956B (zh) * 2003-04-17 2011-10-05 皇家飞利浦电子股份有限公司 音频信号合成
EP2265041B1 (fr) * 2003-04-30 2017-12-13 Dolby International AB Traitement avancé basé sur une batterie de filtres modulée de façon complexe et exponentielle et procédés de signalisation de temps adaptatifs
EP2124485B1 (fr) * 2003-04-30 2018-06-27 Dolby International AB Traitement perfectionné reposant sur un banc de filtres à modulation exponentielle complexe et sur des procédés de signalisation temporelle adaptatifs
EP2265040B1 (fr) * 2003-04-30 2018-06-27 Dolby International AB Traitement avancé basé sur une batterie de filtres modulée de façon complexe et exponentielle et procédés de signalisation de temps adaptatifs
EP3244638B1 (fr) * 2003-04-30 2019-08-28 Dolby International AB Traitement avancé basé sur une batterie de filtres modulée de façon complexe et exponentielle
RU2449387C2 (ru) * 2007-11-21 2012-04-27 ЭлДжи ЭЛЕКТРОНИКС ИНК. Способ и устройство для обработки сигнала
US8504377B2 (en) 2007-11-21 2013-08-06 Lg Electronics Inc. Method and an apparatus for processing a signal using length-adjusted window
US8527282B2 (en) 2007-11-21 2013-09-03 Lg Electronics Inc. Method and an apparatus for processing a signal
US8583445B2 (en) 2007-11-21 2013-11-12 Lg Electronics Inc. Method and apparatus for processing a signal using a time-stretched band extension base signal

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DE19900819A1 (de) 2000-07-13
DE59914844D1 (de) 2008-10-02
EP1024679B1 (fr) 2008-08-20
EP1024679A3 (fr) 2006-10-04

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