WO2006092995A1 - Dispositif de reproduction sonore - Google Patents

Dispositif de reproduction sonore Download PDF

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Publication number
WO2006092995A1
WO2006092995A1 PCT/JP2006/303144 JP2006303144W WO2006092995A1 WO 2006092995 A1 WO2006092995 A1 WO 2006092995A1 JP 2006303144 W JP2006303144 W JP 2006303144W WO 2006092995 A1 WO2006092995 A1 WO 2006092995A1
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Prior art keywords
reverberation
component
sound
speaker
signal
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English (en)
Japanese (ja)
Inventor
Yoshiki Ohta
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Pioneer Corp
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Pioneer Corp
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Priority to JP2007505862A priority Critical patent/JP4430105B2/ja
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/08—Arrangements for producing a reverberation or echo sound
    • G10K15/12—Arrangements for producing a reverberation or echo sound using electronic time-delay networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone

Definitions

  • the present invention belongs to the technical field of an acoustic reproduction apparatus that generates a reverberation component in an input sound signal and performs loudspeaking control.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-255955
  • the sound signal that is the source of the reverberation component provided as the direct sound component and the reverberation component provided as the indirect sound component are the same. Since the loud sound is amplified by the peak power, the correlation between the direct sound component and the reverberation component in the loud sound may be high, and it may not be possible to effectively provide a sense of realism.
  • the present invention provides an acoustic reproduction device that can provide an effective presence by reducing the correlation between a direct sound component and a reverberation component. It is in.
  • the invention according to claim 1 provides a plurality of input voice messages.
  • a sound reproduction device for loudening the corresponding speaker which is each speaker corresponding to the characteristics of each sound signal, based on the number, an acquisition means for acquiring each sound signal as a sound source, and each acquired sound Generating means for generating a reverberation component in the signal, and output control for causing each of the acquired sound signals to be output from each corresponding speaker, and outputting each of the generated reverberation components from a non-corresponding speaker different from the corresponding speaker.
  • a sound reproduction device for loudening the corresponding speaker which is each speaker corresponding to the characteristics of each sound signal, based on the number
  • an acquisition means for acquiring each sound signal as a sound source, and each acquired sound Generating means for generating a reverberation component in the signal, and output control for causing each of the acquired sound signals to be output from each corresponding speaker, and outputting each of the generated reverberation components from a non-corresponding speaker different from the
  • FIG. 1 is a block diagram showing a configuration of a first embodiment of a surround system according to the present application.
  • FIG. 2 is a block diagram showing a configuration of a signal processing unit in the first embodiment.
  • FIG. 3 is a diagram showing an output destination speaker corresponding to a corresponding speaker channel of an audio signal input to each reverberation control circuit.
  • FIG. 4 is a diagram for explaining a speaker determination method.
  • FIG. 5 is a diagram showing a relationship between a speaker and (1-IACC [E3]).
  • FIG. 6 is a diagram showing the relationship between a speaker and (1-IACC [L3]).
  • FIG. 7 is a block diagram showing a configuration of a reverberation control circuit of the signal processing unit in the first embodiment.
  • the embodiment described below is an embodiment in which the sound reproduction device of the present application is applied to a signal processing device in a 5. lch surround system (hereinafter simply referred to as a surround system). It is.
  • FIG. 1 is a block diagram showing the configuration of the surround system of this embodiment.
  • the surround system 100 of the present embodiment is installed in a listening room 10, that is, in a sound field space that provides a sound to be reproduced to a listener.
  • a sound source is reproduced or acquired, and predetermined signal processing is performed on the reproduced sound or the acquired sound.
  • This surround system 100 provides a sound field space with a sense of presence (surround feeling) for the listener by amplifying the signal-processed sound for each speaker by the 5.lch speaker system 130. It is like this.
  • the surround system 100 reproduces a sound source such as a recording medium or acquires a sound source from the outside such as a television signal, so that a channel (also referred to as a channel) corresponding to each speaker is obtained.
  • the sound source output device 110 that outputs bit stream data in a certain format having components, and the bit stream output from the sound source output device 110 is decoded into an audio signal for each channel, and the signal is output for each audio signal of each channel. It consists of a signal processing device 120 that performs processing and analyzes the reverberation characteristics and other spatial characteristics of the listening room 10, and a speaker system 130 that corresponds to each channel, that is, consists of various speakers that have each characteristic. Is done.
  • a channel refers to a signal transmission path of an audio signal output to each speaker.
  • Each channel is designed to transmit audio signals that have fundamentally different characteristics from other channels! /
  • the sound source output device 110 is configured, for example, as a media playback device such as a CD (Compact disc) or a DVD (Digital Versatile Disc) or a receiving device that receives a digital television broadcast.
  • the sound source output device 110 reproduces a sound source such as a CD, or acquires a broadcast sound source, and outputs bit stream data having each channel component corresponding to 5.lch to the signal processing device 120. It becomes.
  • Bit stream data having each channel component output from the sound source output device 110 is input to the signal processing device 120, and the signal processing device 120 receives the input bit stream data. Are decoded into audio signals for each channel.
  • the signal processing device 120 includes:
  • the signal level and delay amount of each decoded audio signal are adjusted, and the volume level is adjusted by converting each audio signal processed into an analog signal. ing.
  • the signal processing device 120 outputs each audio signal whose volume level is adjusted to each speaker of the speaker system 130.
  • the speaker system 130 includes a center speaker 131 disposed in front of the listener, and a front left speaker (hereinafter referred to as an FL speaker) disposed in front of the listener and disposed on the right or left side of the center speaker 131.
  • a front left speaker hereinafter referred to as an FL speaker
  • 132FL and front right speaker power hereinafter referred to as FR ⁇ peak force
  • 132FR is placed behind the listener and placed on the right or left side of each of FL speaker power 132FL and FR speaker 132FR.
  • SL speaker 133SL and surround right speaker (hereinafter referred to as “SR ⁇ peak power”) 133SR and low-frequency playback speaker power (hereinafter referred to as “subwoofer”) 134 And have.
  • the center speaker 131, the FL speaker 132FL, the FR speaker 132F R, the SL speaker 133SL, and the SR speaker 133SR have frequency characteristics that can be reproduced over almost the entire frequency band when the audio signal is amplified. It is composed of all-band type speaker power, and each signal is amplified with its radiation axis directed toward the listening position.
  • the subwoofer 134 is used to amplify a predetermined low frequency band.
  • the signal processing device 120 of the present embodiment is used when bit stream data of a predetermined format having each channel component is input and decoded into an audio signal for each channel.
  • An input processing unit 121 that converts the audio data into a signal format
  • a signal processing unit 200 that decodes the converted audio data into an audio signal for each channel and performs signal processing for each channel
  • an audio signal for each channel DZA converter 122 that performs digital Z-analog (hereinafter referred to as DZA) conversion of the audio signal
  • power amplifier 123 that amplifies the reproduction level of the signal of each channel for each channel
  • An operation unit 124 for performing operations and a system control unit 125 for controlling each unit are provided.
  • the input processing unit 121 of the present embodiment constitutes acquisition means of the present invention
  • the signal processing unit 200 constitutes generation means and output control means of the present invention.
  • the input processing unit 121 is configured to receive bit stream data in a predetermined format having each channel component, and the input processing unit 121 converts the input bit stream data into a predetermined format.
  • the converted audio data is output to the signal processing unit 200.
  • the audio data output from the input processing unit 121 is input to the signal processing unit 200, and the signal processing unit 200 converts the input audio data into an audio signal for each channel. And a predetermined signal processing for each channel.
  • the audio signal of the corresponding channel is output to each DZA module 122.
  • the signal processing unit 200 performs frequency characteristic adjustment, delay time control, signal level control, reverberation component generation, and the like on an input signal. Coefficients required when performing each signal processing are determined, each signal processing is performed based on each determined coefficient, and each input signal and the reverberation component of each generated signal are applied to each speaker. Output control is performed and output to each DZA variable l22.
  • Each audio signal subjected to signal processing for each channel is input to the DZ A converter 122.
  • This DZA converter 122 receives the input digital signal.
  • These audio signals and test signals are converted into analog signals and output to the respective power amplifiers 123.
  • An audio signal subjected to signal processing for each channel is input to the power amplifier 123.
  • This power amplifier 123 is designated by the operation unit 124 under the control of the system control unit 125.
  • the playback level of the audio signal for each channel is amplified based on the sound volume instruction, and the amplified audio signal is output to each speaker corresponding to each channel.
  • the operation unit 124 includes a remote control device including various keys such as various confirmation buttons, selection buttons, and numeric keys, or various key buttons, and is used for inputting predetermined operation instructions. It has become.
  • the operation unit 124 of the present embodiment can directly set each coefficient and can set a reverberation parameter to be described later corresponding to a predetermined reverberation time.
  • the system control unit 125 comprehensively controls general functions for amplifying the audio signal by amplifying the audio signal from each speaker.
  • the system control unit 125 performs a process of setting a reverberation control coefficient when amplifying the audio signal based on a user operation.
  • the system control unit 125 of the present embodiment calculates data of reverberation parameters ( ⁇ to be described later) calculated by the reverberation characteristics of the analyzed listening room 10 or set via the operation unit 124. Based on the above, the reverberation control coefficient is calculated, and each of the calculated reverberation control coefficients is set in each reverberation control circuit 240.
  • the system control unit 125 of the present embodiment when calculating each reverberation parameter, the system control unit 125 of the present embodiment generates a loud sound that is also loudened by each speaker at an arbitrary listening position in the listening room 10, such as a microphone (not shown). Is used to measure and analyze, and the approximate linear force of the reverberation attenuation characteristic is also used to calculate the reverberation time of the listening room 10.
  • the system control unit 125 calculates a parameter (reverberation parameter) that is proportional to the reverberation amount and has a one-to-one correspondence based on the reverberation time. Further, the system control unit 125 calculates a reverberation control coefficient based on the reverberation parameter, as will be described later.
  • the reverberation attenuation characteristic is a characteristic indicating temporal attenuation of the amplitude level (intensity) of a loud sound to be heard at an arbitrary listening position in the listening room 10. For example, based on the collected sound signal in a predetermined test signal, the amplitude level force is attenuated by S60 dB for each frequency band with reference to the time at which the steady sound is stopped from any speaker power to the listening position. The time until is called reverberation time.
  • FIG. 2 is a block diagram showing the configuration of the signal processing unit 200 in this embodiment
  • FIG. 3 shows the output destination corresponding to the channel of the corresponding speaker of the audio signal input to each reverberation control circuit 240. It is a figure which shows this speaker.
  • the signal processing unit 200 decodes the input audio data into audio signals for each channel, and converts the decoded audio signals into audio signals for each channel under the control of the system control unit 125. On the other hand, predetermined signal processing is performed for each channel.
  • the signal processing unit 200 adjusts the frequency characteristics of the audio signal for each channel and the decoder 210 that decodes the audio signal for each channel based on the input audio data.
  • Frequency characteristic adjustment circuit 220 and other channels The signal level between the channels and the signal level Z delay adjusting unit 230 that delays the signal input for each channel and the reverberation control coefficient set as described later, for each channel.
  • the reverberation control circuit 240 that generates the reverberation component of the audio signal, the output control unit 250 that controls the output of the audio signal of each channel and the generated reverberation component to each speaker, and the signal under the control of the system control unit 125
  • a signal processing control unit 260 that controls each unit in the processing unit 200.
  • the signal processing unit 200 includes a frequency characteristic adjustment circuit 220, a signal level Z delay adjustment unit 230, and a reverberation control circuit 240 for each channel.
  • the signal processing control unit 260 and each unit include Connected by bus B.
  • the reverberation control circuit 240 of the present embodiment constitutes the generation means of the present invention
  • the output control unit 250 constitutes the output control means of the present invention.
  • Audio data is input to the decoder 210.
  • the decoder 210 decodes the input audio data into an audio signal for each channel, and adjusts the frequency characteristics for each channel. It outputs to the circuit 220.
  • each frequency characteristic adjusting circuit 220 a filter coefficient for adjusting the gain of the signal component is set for each frequency band under the control of the signal processing control unit 260. ing.
  • Each frequency characteristic adjusting circuit 220 is adapted to receive an input audio signal for each channel, and with respect to a signal input with V ⁇ based on each set filter coefficient. The frequency characteristics are adjusted and output to each signal level Z delay adjustment unit 230.
  • Each signal level Z delay adjusting unit 230 is a coefficient for adjusting an attenuation rate between channels for each channel under the control of the signal processing control unit 260 (hereinafter referred to as an attenuation coefficient). And a coefficient for adjusting the delay amount (delay time) in the audio signal or test signal corresponding to each channel (hereinafter referred to as a delay control coefficient) is set.
  • each signal level Z delay adjusting unit 230 is inputted with an audio signal whose frequency characteristics are adjusted for each frequency band, and each signal level Z delay adjusting unit 230 is set. Based on the attenuation coefficient and delay control coefficient! /, The attenuation rate and delay amount between channels for the input audio signal The audio signal with the adjusted attenuation rate and delay amount is output to each reverberation control circuit 240.
  • Each reverberation control circuit 240 is set with a reverberation control coefficient determined by the signal processing control unit 260 as described later, and each reverberation control circuit 240 has an adjusted signal level.
  • a reverberation component is generated from the received audio signal and output to the output control unit 250.
  • each reverberation control circuit 240 is input with an audio signal whose signal level and delay amount are adjusted, and each reverberation control circuit 240 is provided with each channel.
  • Each input audio signal is divided into a plurality of frequency bands.
  • Each reverberation control circuit 240 generates a reverberation component for each frequency band in an audio signal input based on a reverberation control coefficient described later, and the generated reverberation component and the input audio signal (hereinafter referred to as an audio signal) , The direct sound component)) is output to the output control unit 250.
  • the audio signal of each channel output from each reverberation control circuit 240 and the reverberation component generated by each reverberation control circuit 240 are input to the output control unit 250.
  • the output control unit 250 outputs a direct sound component to a speaker (hereinafter also referred to as a corresponding speaker) determined for each channel, and outputs a reverberation component to a predetermined speaker output destination as described later. Accordingly, the output is made to a speaker different from the corresponding speaker (hereinafter referred to as a non-corresponding speaker). That is, the output control unit 250 outputs the reverberation component to a speaker that does not output a direct sound component.
  • the reverberation component is an audio signal that is the source of the reverberation component. Is loudened from the same speaker. Therefore, in the listener, the reverberation component produced by the sound expansion of the audio signal cannot be heard in one direction! / ⁇ , so a natural reverberation cannot be provided. Place There are many matches. That is, in a predetermined listening environment such as a concert hall, the reverberation component generated by an arbitrary sound reaches the listener from various directions. Therefore, in order to reproduce the listening environment, various reverberation components are used. It should be provided to the listener from the direction.
  • the output control unit 250 becomes an index of the direct sound component that directly reaches the listener in an arbitrary listening room 10 as the reference index (1 IACC (Interaural Cross-Correlation Coefficient) [E3]) and (1 IACC [L3]), which is an index of the indirect sound component that indirectly reaches the listener, determine in advance the loudspeaker that reverberates the reverberation component. Based on the determined speaker arrangement, the output of the reverberation component of each channel generated by the reverberation control circuit 240 is controlled!
  • IACC Interaural Cross-Correlation Coefficient
  • an average of the two indices (1 IACC [E3]) and (1 IACC [L3]) is calculated in advance with a predetermined device, as shown in FIG.
  • the original channel that is, the output speaker corresponding to the corresponding speaker channel of the audio signal input to each reverberation control circuit 240 is determined.
  • the output control unit 250 outputs a reverberation component of a first reverberation component and a second reverberation component, which will be described later, and a direct sound component so as to correspond to the determined speaker.
  • FIG. 4 is a diagram for explaining a speaker determination method
  • FIG. 5 is a diagram showing a relationship between the speaker and (1 IACC [E3]).
  • FIG. 6 is a diagram showing the relationship between the speaker and (1-IACC [L3]).
  • This (1-IACC [E3]) is also known as BQI (Binaural Quality Index), and is an indicator that shows a very high correlation with the subjective preference of the listening norm 10.
  • this IACC [E3] is directly heard from the listener in the listening room 10 at any location.
  • the inter-aural correlation coefficient of the three bands with the center frequency of 500 Hz, lkHz and 2 kHz is averaged.
  • (1 IACC [L3]) is an index indicating the feeling of sound envelopment in the listener and the relationship with LEV (Listener Envelopment).
  • this IACC [L3] is between the three bands of the three bands with center frequencies of 500Hz, lkHz, and 2kHz in the components from 80msec to 1000msec after the direct sound component reaches the listener in the desired place in the listening room 10.
  • the correlation coefficient is averaged.
  • an arbitrary speaker serving as a reference also outputs a reverberation component when a direct sound component is output.
  • a reference speaker When the placement positions of the left and right speakers such as the SL speaker and SR speaker are rotated 360 degrees around the listening position, the binaural correlation coefficient for the placement angle of the speaker 1 and the placement angle of the speaker 2 As shown in Fig. 5 and Fig.
  • the binaural phase is set at an angle of 120 degrees and 250 degrees. Since the number of relations increases, in this embodiment, the speaker is arranged at 120 ° and 250 ° arrangement positions with respect to the speaker that amplifies the direct sound component that is the audio signal of each channel. The speaker to which each reverberation component is output is determined so that the reverberation component is amplified from the deaf speaker!
  • the signal processing control unit 260 performs each frequency characteristic adjustment circuit based on the spatial characteristic of the analyzed listening room 10 or the value set through the operation unit 124 under the instruction of the system control unit 125. 220, each signal level Z delay adjustment unit 230 and each reverberation control circuit 240 filter coefficients, attenuation coefficients, delay control coefficient coefficients are determined and set It has become. Further, the signal processing control unit 260 calculates each reverberation control circuit 240 based on the reverberation parameter data calculated from the analyzed reverberation characteristics of the listening room 10 or set through the operation unit 124. The reverberation control coefficients for performing generation control of each reverberation component are calculated for each frequency band, and the calculated reverberation control coefficients are set in the reverberation control circuits 240, respectively.
  • the signal processing control unit 260260 of the present embodiment sets the reverberation control coefficients gl and g2 for each reverberation control circuit 240 based on the reverberation parameter corresponding to the reverberation addition amount indicating the reverberation time on a one-to-one basis. The calculation is made for each frequency band.
  • the parameter gl is a value that satisfies gl ⁇ l, and the parameter 1) is a predetermined natural number.
  • (ml) it is desirable to use different values for each reverberation control circuit 240 and for each frequency band, but the same value should be shown for each reverberation control circuit 240 or for each frequency band.
  • the parameter g2 is a value that satisfies g2 and 1.
  • the parameter (m2) represents a predetermined natural number, although (m2) preferably represents a different value for each reverberation control circuit 240 and each frequency band, but for each reverberation control circuit 240, Or you may make it show the same value for every frequency band.
  • FIG. 7 is a block diagram showing the configuration of the reverberation control circuit 240 in the present embodiment. Further, each reverberation control circuit 240 in the present embodiment has the same configuration.
  • Each reverberation control circuit 240 receives an audio signal of each channel whose signal level and delay amount are adjusted. Each of the reverberation control circuits 240 divides the input audio signal into a plurality of frequency bands when an audio signal is input, and the reverberation control set by the signal processing control unit 260. A reverberation component is generated for each frequency band for the input audio signal based on the coefficient. Each reverberation control circuit 240 is generated for each frequency band. The reverberation component and the audio signal divided for each frequency band are synthesized and output to each DZA module 122.
  • the reverberation control coefficient calculated as described above by the signal processing control unit 260 is set in each reverberation control circuit 240 under the control of the signal processing control unit 260.
  • each reverberation control circuit 240 includes a filter processing unit 241 that divides an input audio signal into predetermined frequency bands, and a signal processing control unit. 260 sets a reverberation control coefficient, and generates a reverberation component 242 for each frequency band divided based on the set reverberation control coefficient, and a reverberation component generated for each frequency band.
  • the reverberation control coefficient set in the reverberation component generation unit 242 is set for each channel and each frequency band.
  • the filter processing unit 241 is configured to receive an audio signal in one channel output from the signal level / delay adjustment unit 230 connected to the filter processing unit 241. Also, when an audio signal in one channel is input to the filter processing unit 241, the input audio signal is divided into signal components for each predetermined frequency band, and the divided signal components are divided. Each reverberation component generator 242 outputs.
  • the filter processing unit 241 of the present embodiment is configured to divide each frequency of 500 Hz, lkHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz into a frequency band having a center frequency.
  • Each signal component is output to each reverberation component generator 242.
  • each reverberation component generation unit 242 a reverberation control coefficient corresponding to each reverberation component generation unit 242 is set by the signal processing control unit 260.
  • Each reverberation component generation unit 242 generates a reverberation component for one signal component of the divided audio signal based on a set reverberation control coefficient. And enter The input signal component is output to the first frequency synthesizer 243, the second frequency synthesizer 244, and the third frequency synthesizer 245.
  • each reverberation component generation unit 242 distributes the input audio signal into a plurality of frequency band components predetermined for each frequency band, and reverberation control.
  • a first generation unit 247 that generates a first reverberation component that is a first reverberation component for one component that is set with a coefficient and is distributed based on the set reverberation control coefficient!
  • FIG. 6 shows each reverberation component generation unit 242 from the first reverberation component generation unit 242 to the nth reverberation component generation unit 242 for each frequency band.
  • the first reverberation component generation unit 242252 in order of the frequency band power of the low band for each frequency band centered on each frequency of 500 Hz, lkHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz.
  • the sixth reverberation component generation unit 242 is provided.
  • the reverberation component generation unit 242 of the present embodiment constitutes a generation unit of the present invention.
  • Each distributor 246 receives one corresponding signal component output from the filter processing unit 241, and each distributor 246 converts the input signal component into the first signal component. Distribution is performed to the generation unit 247, the second generation unit 248, and the third frequency synthesis unit 245, respectively.
  • each distributor 246 multiplies the input signal component by a different coefficient, thereby obtaining a first signal component (hereinafter referred to as a first signal component) and a second signal component.
  • Signal components hereinafter referred to as second signal components
  • the generated first signal component and second signal component are output to the first generation unit 247 or the second generation unit 248, respectively.
  • each distributor 246 directly outputs the signal component (the direct sound component described above) as it is to the first frequency synthesizer 243.
  • each distributor 246 has reverberation in the first generator 247 and the second generator 248.
  • Each signal component distributed to perform feedback compensation when generating the component is multiplied by a preset coefficient bl or b2 (hereinafter referred to as an initial coefficient).
  • the reverberation control coefficient corresponding to the frequency band is set by the signal processing control unit 260 in the reverberation control circuit 240.
  • the signal processing control unit 260 in the reverberation control circuit 240 For example, in the present embodiment, It is set in a memory (not shown) provided in the first generator 247.
  • the first generation unit 247 outputs the first signal component output from the distributor 246 and multiplied by the initial coefficient, and is output from the component mixing adjustment unit 249 as described later, and is determined in advance. And a feedback reverberation component having a delayed time.
  • the first generation unit 247 adds a feedback reverberation component having a predetermined delay time to the input first signal component, and adds the first signal added based on the set reverberation control coefficient.
  • a reverberation component having a predetermined delay time in the component is generated, and the generated reverberation component is output to the first frequency synthesis unit 243 and the component mixing adjustment unit 249 as the first reverberation component.
  • the first generation unit 247 converts the first signal component based on the reverberation control coefficient set in the internal memory.
  • the calculation shown in (Equation 1) is performed to generate the first reverberation component, and the generated first reverberation component is output to the first frequency synthesis unit 243 and the component mixing adjustment unit 249. It has become.
  • the parameter gl is calculated by the signal processing control unit 260 as described above It is one of the set reverberation control coefficients.
  • (ml) preferably shows a different value for each reverberation control circuit 240 and each first generation unit 247, but shows the same value for each reverberation control circuit 240 or each first generation unit 247. You may do it.
  • the first reverberation component generated by the first generation unit 247 increases the reverberation time when the parameter oc increases and the reverberation time when the parameter oc decreases, as shown in (Equation 1). Has come to decrease. Also output from the component mixing adjustment unit 249 and predetermined. As will be described later, the feedback reverberation component having the delayed time is a reverberation component that is a mixture of the first reverberation component and the second reverberation component.
  • the reverberation control coefficient corresponding to the reverberation control circuit 240 and corresponding to the frequency band is set in the second generation unit 248 by the signal processing control unit 260.
  • the signal processing control unit 260 For example, in this embodiment, it is set in a memory (not shown) provided in the second generation unit 248.
  • the second signal component output from the distributor 246 and multiplied by the initial coefficient, and output from the component mixing adjustment unit 249 as described later, are set in advance. And a feedback reverberation component having a delayed time. Then, the second generation unit 248 adds a feedback reverberation component having a predetermined delay time to the input second signal component, and adds the first signal added based on the set reverberation control coefficient. A reverberation component having a predetermined delay time in the component is generated, and the generated reverberation component is output as a second reverberation component to the second frequency synthesis unit 244 and the component mixing adjustment unit 249.
  • the second generation unit 248 converts the second signal component based on the reverberation control coefficient set in the internal memory.
  • the calculation shown in (Equation 2) is performed to generate the second reverberation component, and the generated second reverberation component is output to the second frequency synthesis unit 244 and the component mixing adjustment unit 249. It has become.
  • Second reverberation component (second signal component) XZ ( -ffl 2) X g 2 ⁇ '. (Equation 2)
  • parameter g2 is the same as signal gl This is one of the reverberation control coefficients calculated and set by the processing control unit 260. It is desirable that (m2) indicates a different value for each reverberation control circuit 240 and each second generation unit 248. However, the same value is used for each reverberation control circuit 240 or each second generation unit 248. May be shown.
  • the second reverberation component generated in the second generation unit 248 increases the reverberation time as the parameter a increases, as shown in (Equation 2).
  • Equation 2 the reverberation time decreases.
  • the feedback reverberation component output from the component mixing adjustment unit 249 and having a predetermined delay time is a reverberation component in which the first reverberation component and the second reverberation component are mixed, as will be described later.
  • the first reverberation component output from the first generation unit 247 and the second reverberation component output from the second generation unit 248 are input to the component mixing adjustment unit 249.
  • the component mixture adjusting unit 249 generates a feedback reverberation component based on the input first and second reverberation components, and outputs the generated feedback reverberation component to the first generation unit 247 and the second generation unit 248. That is, it is made to return.
  • the component mixing adjustment unit 249 performs the calculation shown in (Equation 3) using the input first reverberation component and second reverberation component, and mixes the first reverberation component and the second reverberation component.
  • the reverberation component generated using the determinant of (Equation 3) is output to the first generation unit 247 and the second generation unit 248 as a feedback reverberation component.
  • Equation 3 ( ⁇ ; (first reverberation component, second reverberation component) A ⁇ (Equation 3)
  • B1 and B2 indicate feedback reverberation components
  • the component mixing adjustment unit 249 determines that the first feedback reverberation component B1 is The second feedback reverberation component B2 is fed back to the second generator 24 8256.
  • the matrix A shown in (Equation 3) is expressed by (Equation 4), and the matrix A is It is a total matrix.
  • the feedback circuit of the reverberation component generation unit 242 is stable in addition to the above-described conditions of gl ⁇ l and g2 ⁇ l. Become.
  • the first reverberation component generated in each reverberation component generator 242 is input to the first frequency synthesizer 243.
  • the first frequency synthesizer 243 receives the input of each first reverberation component 243. 1 Synthesize the reverberation component and play the audio signal of the first reverberation component of the channel And output to the output control unit 250.
  • the second reverberation component generated in each reverberation component generation unit 242 is input to the second frequency synthesis unit 244, and the second frequency synthesis unit 244 receives the input of each second reverberation component.
  • the reverberation component is synthesized, and the audio signal in the second reverberation component of the channel is reproduced and output to the output control unit 250.
  • the third frequency synthesizer 245 receives one signal component of the audio signal divided into each frequency band.
  • the third frequency synthesizer 245 receives each frequency input. By synthesizing one signal component of the audio signal divided into bands, the audio signal of the channel is regenerated and output to the output control unit 250.
  • the reverberation component generation unit 242 of the present embodiment the first generation unit 247, the second generation unit 248, and the component mixing adjustment unit 249 constitute a feedback delay network (FDN).
  • FDN feedback delay network
  • the reverberation component generator 242 of this embodiment generates a reverberation component using the feedback delay network.
  • the signal processing device 120 that amplifies the corresponding speaker, which is each speaker corresponding to the characteristic of each audio signal, based on the plurality of input audio signals,
  • An input processing device 121 that acquires each audio signal as a sound source, a reverberation control circuit 240 that generates a reverberation component in each acquired audio signal, and a sound that is generated and amplified from each corresponding speaker.
  • an output control unit 250 that outputs each reverberation component from a non-corresponding speaker different from the corresponding speaker.
  • the signal processing device 120 of the present embodiment causes the obtained audio signals to be amplified from the corresponding speakers, and the generated reverberation components differ from the corresponding speakers.
  • the correlation between the direct sound component and the reverberation component can be increased, and an effective presence can be provided.
  • the reverberation control circuit 240 generates at least two types of reverberation components for each audio signal, and the output control unit 250 includes the audio signal in each audio signal.
  • Each reverberation component is arranged symmetrically with respect to the listener. It has a configuration for outputting from a speaker.
  • the signal processing device 120 of the present embodiment outputs each reverberation component in each audio signal from a speaker arranged symmetrically with respect to the listener.
  • the correlation between reverberant components can be lowered and an effective presence can be provided.
  • the reverberation control circuit 240 adjusts the addition amount of at least two types of reverberation components by changing the parameter oc. With this configuration, a reverberation component can be easily and accurately generated for an audio signal, and the correlation between the direct sound component and the reverberation component can be reduced.
  • the signal processing device 120 has a configuration in which the reverberation control circuit 240 generates at least two types of reverberation components based on one parameter! In addition, a plurality of reverberation components can be generated with respect to the audio signal accurately.
  • a speaker that outputs a reverberation component is determined based on two types of correlation coefficients of the binaural correlation coefficient of the indirect sound component that indirectly reaches the listener.
  • the signal processing device 120 of this embodiment allows the binaural correlation coefficient of the direct sound component.
  • IACC Interaural Cross-Correction Coefficient
  • L3 binaural correlation coefficients of indirect sound components
  • a reverberation parameter is calculated for each channel and for each preset frequency band, and a reverberation time coefficient is set for each frequency band in the reverberation control circuit 240.
  • the reverberation parameters in all frequency bands are calculated for each channel without being divided for each preset frequency band, and the reverberation control coefficient is calculated based on the calculated reverberation parameters.
  • the calculated reverberation control coefficient may be set in the reverberation control circuit 240 for each channel.
  • the reverberation parameter is calculated for each channel, and the reverberation time coefficient is set for each frequency band in the reverberation control circuit 240.
  • the reverberation parameter is set for all channel levels. You may be able to calculate the reverberation parameters that are unique to all channels.
  • each reverberation control circuit 240 mixes each reverberation component in the two paths and generates a reverberation component based on the reverberation control coefficient data! /
  • the reverberation component may be generated by one or three or more noses.
  • each reverberation control circuit 240 generates a reverberation component for each predetermined frequency band, but the input audio signal is generated for each of a plurality of frequency bands.
  • the reverberation component may be generated without being divided.
  • each reverberation control circuit 240 is provided with a reverberation component generation unit 242 that generates and adds a reverberation component to all frequency bands of the audio signal and the test signal, or is determined in advance.
  • the reverberation component generation unit 242 that generates the reverberation component for each frequency band may be provided in a column to generate the reverberation component.
  • each reverberation control circuit 240 mixes each reverberation component in two paths and generates a reverberation component based on the reverberation control coefficient data! /
  • the reverberation component can be generated by methods other than those described above, as long as the delay time of the reverberation component to be generated is generated using the reverberation control coefficient data.
  • the power that explains the setting processing of the reverberation time using the 5. lch surround system 100 is also has a pseudo surround effect.
  • a device that applies the above it can also be applied to other sound reproduction devices such as a stereo sound reproduction device such as an AV amplifier.
  • the signal processing device 120 performs addition of reverberation components and other signal processing based on the digital signal output from the sound source output device 110.
  • the signal processing device 120 may perform signal processing based on an analog signal output from the sound source output device 110 or another analog signal input from an external force.
  • the entire disclosure of the Japanese patent application No. 2005-56356 including the specification, claims, drawings and abstract filed on March 1, 2005 is referred to Incorporated here.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Stereophonic System (AREA)

Abstract

L’invention concerne un dispositif de reproduction sonore permettant de créer une ambiance particulière en renforçant la corrélation entre les composantes sonores directes et les composantes de réverbération. Selon l’invention, un module de traitement de signaux (200) comprend un circuit de commande de réverbération (240) servant à générer les composantes de réverbération de signaux audio pour des voies individuelles en fonction d’un ensemble de coefficients de commande de réverbération, un module de commande de sortie (250) servant à assurer la commande en sortie des signaux audio des voies individuelles et des composantes de réverbération produites appliqués à des haut-parleurs individuels, et un module de commande de traitement de signaux (260) servant à commander des modules individuels dans le module de traitement de signaux (200), sous la commande d’un module de commande de système (125). Selon la sortie souhaitée d’un haut-parleur prédéterminé, les signaux audio des voies individuelles et les composantes de réverbération individuelles sont appliqués aux haut-parleurs correspondants.
PCT/JP2006/303144 2005-03-01 2006-02-22 Dispositif de reproduction sonore Ceased WO2006092995A1 (fr)

Priority Applications (1)

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JP2007505862A JP4430105B2 (ja) 2005-03-01 2006-02-22 音響再生装置

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JP2005-056356 2005-03-01

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PCT/JP2006/303144 Ceased WO2006092995A1 (fr) 2005-03-01 2006-02-22 Dispositif de reproduction sonore

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Cited By (2)

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DE102011082310A1 (de) 2011-09-07 2013-03-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung, Verfahren und elektroakustisches System zur Nachhallzeitverlängerung
WO2023199746A1 (fr) 2022-04-14 2023-10-19 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ Procédé de reproduction acoustique, programme informatique et dispositif de reproduction acoustique

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JPH06266377A (ja) * 1993-03-16 1994-09-22 Matsushita Electric Ind Co Ltd 音場補正装置
JPH08116597A (ja) * 1994-08-24 1996-05-07 Sharp Corp 音像拡大装置
JP2001314000A (ja) * 2000-04-28 2001-11-09 Pioneer Electronic Corp 音場生成システム

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JPH06266377A (ja) * 1993-03-16 1994-09-22 Matsushita Electric Ind Co Ltd 音場補正装置
JPH08116597A (ja) * 1994-08-24 1996-05-07 Sharp Corp 音像拡大装置
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011082310A1 (de) 2011-09-07 2013-03-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung, Verfahren und elektroakustisches System zur Nachhallzeitverlängerung
WO2013034444A1 (fr) 2011-09-07 2013-03-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif, procédé et système électroacoustique de prolongement du temps de réverbération
CN103907151A (zh) * 2011-09-07 2014-07-02 弗兰霍菲尔运输应用研究公司 用于混响时间延长的装置、方法和电声系统
US9355632B2 (en) 2011-09-07 2016-05-31 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Apparatus, method and electroacoustic system for reverberation time extension
CN103907151B (zh) * 2011-09-07 2016-08-24 弗劳恩霍夫应用研究促进协会 用于混响时间延长的装置、方法和电声系统
WO2023199746A1 (fr) 2022-04-14 2023-10-19 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ Procédé de reproduction acoustique, programme informatique et dispositif de reproduction acoustique

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