WO2009107202A1 - 音響信号処理装置及び音響信号処理方法 - Google Patents
音響信号処理装置及び音響信号処理方法 Download PDFInfo
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- WO2009107202A1 WO2009107202A1 PCT/JP2008/053298 JP2008053298W WO2009107202A1 WO 2009107202 A1 WO2009107202 A1 WO 2009107202A1 JP 2008053298 W JP2008053298 W JP 2008053298W WO 2009107202 A1 WO2009107202 A1 WO 2009107202A1
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- acoustic signal
- signal
- sound
- sound field
- correction
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to an acoustic signal processing device, an acoustic signal processing method, an acoustic signal processing program, and a recording medium on which the acoustic signal processing program is recorded.
- the installation environment of such an audio device is various. For this reason, it often happens that a plurality of speakers that output sound cannot be arranged at positions having symmetry in terms of the multi-channel surround system.
- the plurality of speakers are placed at positions having symmetry that is recommended from the viewpoint of the multi-channel surround system. Can not be placed.
- the characteristics of each speaker are often not optimal in realizing the multi-channel surround system. For this reason, in order to obtain good quality surround sound by the adopted multi-channel surround system, it is necessary to correct the sound field by correcting the acoustic signal.
- the acoustic device (hereinafter, also referred to as “sound source device”) that needs to correct the acoustic signal for the sound field correction as described above is not limited to one type.
- a sound source device that is assumed to be mounted on a vehicle, there are a player that reproduces the audio content recorded on the above-described DVD or the like, a broadcast receiving device that reproduces the audio content included in the broadcast wave, and the like.
- a technique for sharing a means for correcting an acoustic signal has been proposed (see Patent Document 1: hereinafter referred to as “conventional example”).
- the conventional technology described above is a technology for suppressing the occurrence of a sense of incongruity with the user's volume due to switching of the sound source device. For this reason, the technology of the conventional example does not perform sound field correction processing in order to make the sound field formed by output sounds from a plurality of speakers full of presence.
- a sound source device (so-called genuine product) mounted on a vehicle at the time of manufacture of the vehicle
- a specific sound field correction process is performed on the original sound signal faithful to the audio content, and the speaker Some of them generate acoustic signals for provision to.
- an acoustic device that is not a genuine product generally generates an original acoustic signal as an acoustic signal for providing to a speaker. For this reason, when sound reproduction is performed by switching between a sound source device that has been subjected to sound field correction processing and a sound source device that has not been subjected to sound field correction processing, a difference in sound quality may occur for the user. become.
- the present invention has been made in view of the above circumstances, and supplies an output audio signal that has been subjected to a unified sound field correction process to a speaker, regardless of which of a plurality of acoustic signals is selected.
- An object of the present invention is to provide an acoustic signal processing device and an acoustic signal processing method capable of performing the above.
- an acoustic signal processing device for generating an acoustic signal to be supplied to a plurality of speakers, receiving means for receiving an acoustic signal from each of a plurality of external devices; and the plurality of external devices Measuring means for measuring a mode of sound field correction processing applied to an acoustic signal received from a specific external device among the devices; as an acoustic signal supplied to the plurality of speakers, other than the specific external device Generating means for generating, when an acoustic signal received from an external device is selected, an acoustic signal that has been subjected to sound field correction processing in a mode measured by the measuring means with respect to the selected acoustic signal;
- An acoustic signal processing device comprising:
- the present invention is an acoustic signal processing method for generating an acoustic signal to be supplied to a plurality of speakers, and a sound applied to an acoustic signal received from a specific external device in the plurality of external devices.
- the present invention is an acoustic signal processing program characterized by causing an arithmetic means to execute the acoustic signal processing method of the present invention.
- the present invention is a recording medium in which the acoustic signal processing program of the present invention is recorded so as to be readable by a calculation means.
- FIG. 1 is a block diagram schematically showing a configuration of an acoustic signal processing device according to an embodiment of the present invention. It is a figure for demonstrating the arrangement position of the four speaker units of FIG. It is a block diagram for demonstrating the structure of the control unit of FIG. It is a block diagram for demonstrating the structure of the reception process part of FIG. It is a block diagram for demonstrating the structure of the sound field correction
- the measurement of the aspect of the sound field correction process in the sound source device 920 0 is a flowchart for explaining the setting of the sound field correction process in the interior of the device of FIG.
- FIG. 1 is a block diagram illustrating a schematic configuration of an acoustic signal processing apparatus 100 according to an embodiment.
- the acoustic signal processing device 100 is a device mounted on the vehicle CR (see FIG. 2).
- the acoustic signal processing apparatus 100 performs processing on an acoustic signal of a 4-channel surround system that is one of the multi-channel surround systems.
- the four-channel surround sound signal includes a left channel (hereinafter referred to as “L channel”), a right channel (hereinafter referred to as “R channel”), a surround left channel (hereinafter referred to as “SL channel”), and a surround right channel.
- L channel left channel
- R channel right channel
- SL channel surround left channel
- SR channel An acoustic signal having a four-channel configuration
- speaker units 910 L to 910 SR corresponding to the L to SR channels are connected to the acoustic signal processing apparatus 100.
- the speaker unit 910 L is disposed in the front door housing on the passenger seat side.
- the speaker unit 910 L is disposed so as to face the passenger seat side.
- the speaker unit 910 R is disposed in the front door housing on the driver's seat side.
- the speaker unit 910 R is disposed so as to face the driver's seat side.
- the speaker unit 910 SL is arranged in a housing on the rear side of the passenger seat.
- the speaker unit 910 SL is disposed so as to face the rear seat on the passenger seat side.
- speaker unit 910 SR is arranged in a housing on the rear side of the driver's seat.
- the speaker unit 910 SR is disposed so as to face the rear seat on the driver's seat side.
- Sound is output from the speaker units 910 L to 910 SR arranged as described above to the sound field space ASP.
- sound source devices 920 0 , 920 1 , 920 2 are connected to the acoustic signal processing device 100.
- each of the sound source devices 920 0 , 920 1 , and 920 2 generates an acoustic signal based on the audio content and sends it to the acoustic signal processing device 100.
- the tone generator 920 0 generates a 4-channel original sound signal faithful to the audio content recorded on a recording medium RM such as a DVD (Digital Versatile Disk). Then, in the sound source device 920 0 , the sound field correction process is performed on the original sound signal, and the sound signal UAS is generated. In the present embodiment, the sound field correction process performed on the original sound signal at the sound source device 920 0, sound field reproduction sound corresponding to when it is output to the sound field space ASP from the speaker units 910 L ⁇ 910 SR It is assumed that correction processing has been performed.
- the acoustic signal UAS is composed of four analog signals UAS L to UAS SR .
- the sound source device 920 1 generates a 4-channel original sound signal faithful to the audio content. Then, the sound source device 920 1, the original audio signal is sent to the audio signal processing device 100 as an acoustic signal NAS.
- the acoustic signal NAS is composed of four analog signals NAS L to NAS SR .
- the sound source device 920 2 generates an original acoustic signal having a 4-channel configuration that is faithful to the audio content. Then, the original sound signal is sent from the sound source device 920 2 to the sound signal processing device 100 as the sound signal NAD.
- the acoustic signal NAD is a digital signal that is not subjected to signal separation for each of the four channels.
- the acoustic signal processing apparatus 100 includes a control unit 110, a display unit 150, and an operation input unit 160.
- the control unit 110 performs generation processing of the output audio signal AOS based on the above-described measurement processing of the appropriate sound field correction processing and the acoustic signal from any one of the sound source devices 920 0 to 920 2 .
- the control unit 110 will be described later.
- the display unit 150 includes, for example, (i) a display device such as a liquid crystal panel, an organic EL (Electro Luminescence) panel, and a PDP (Plasma Display Panel), and (ii) a graphic renderer that controls the entire display unit 150. It comprises a display controller, and (iii) a display image memory for storing display image data.
- the display unit 150 displays operation guidance information and the like according to display data IMD from the control unit 110.
- the above-described operation input unit 160 includes a key unit provided in the main body of the acoustic signal processing device 100 and / or a remote input device including the key unit.
- a key part provided in the main body part a touch panel provided in a display device of the display unit 150 can be used.
- it can replace with the structure which has a key part, or can also employ
- the operation content of the acoustic signal processing apparatus 100 is set. For example, a sound command for selecting whether to output from the speaker units 910 L to 910 SR a sound command based on an acoustic signal from any one of the sound source devices 920 0 to 920 2 , a measurement command in the mode of appropriate sound field correction processing A user performs a selection command or the like using the operation input unit 160. Such input contents are sent from the operation input unit 160 to the control unit 110 as operation input data IPD.
- the control unit 110 includes a reception processing unit 111 as a reception unit, a signal selection unit 112, and a sound field correction unit 113 as a generation unit.
- the control unit 110 includes a signal selection unit 114, a DA (Digital-to-Analogue) conversion unit 115, an amplification unit 116, and a processing control unit 119.
- DA Digital-to-Analogue
- the reception processing unit 111 receives the acoustic signal UAS from the sound source device 920 0 , the acoustic signal NAS from the sound source device 920 1, and the acoustic signal NAD from the sound source device 920 2 .
- the reception processing unit 111 generates a signal UAD from the acoustic signal UAS, generates a signal ND1 from the acoustic signal NAS, and generates a signal ND2 from the acoustic signal NAD.
- the reception processing unit 111 includes AD (Analogue to Digital) conversion units 211 and 212 and a channel separation unit 213.
- the AD conversion unit 211 includes four AD converters.
- the AD converter 211 receives the acoustic signal UAS from the sound source device 920 0 .
- the AD conversion unit 211 AD converts each of the individual acoustic signals UAS L to UAS SR that are analog signals included in the acoustic signal UAS, and generates a digital signal UAD.
- the signal UAD generated in this way is sent to the processing control unit 119 and the signal selection unit 114.
- the AD conversion unit 212 includes four AD converters.
- the AD converter 212 receives the acoustic signal NAS from the sound source device 920 1 . Then, the AD conversion unit 212, each individual acoustic signals NAS L ⁇ NAS SR is an analog signal included in the acoustic signal NAS to AD conversion, and generates a signal ND1 in digital form.
- the signal ND1 generated in this way is sent to the signal selection unit 112.
- the channel separation unit 213 receives the acoustic signal NAD from the sound source device 920 2 . Then, the channel separation unit 213 analyzes the acoustic signal NAD, and converts the acoustic signal NAD into the individual signals ND2 L to ND2 SR corresponding to the L to SR channels in the 4-channel surround system according to the channel designation information included in the acoustic signal NAD. To generate a signal ND2. The signal ND2 generated in this way is sent to the signal selection unit 112.
- the signal selection unit 112 receives the signals ND ⁇ b> 1 and ND ⁇ b> 2 from the reception processing unit 111. Then, the signal selection unit 112 selects one of the signal ND1 and the signal ND2 according to the signal selection designation SL1 from the processing control unit 119, and sends the signal ND1 to the sound field correction unit 113 as the signal SND.
- the signal SND includes individual signals SND L to SND SR corresponding to L to SR.
- the sound field correction unit 113 receives the signal SND from the signal selection unit 112. Then, the sound field correction unit 113 performs sound field correction processing on the signal SND in accordance with the designation from the processing control unit 119. As shown in FIG. 5, the sound field correction unit 113 includes a frequency characteristic correction unit 231, a delay correction unit 232, and a volume correction unit 233.
- the frequency characteristic correction unit 231 receives the signal SND from the signal selection unit 112. Then, the frequency characteristic correction unit 231 includes the individual signals FCD L to FCD SR obtained by correcting the frequency characteristics of the individual signals SND L to SND SR in the signal SND according to the frequency characteristic correction command FCC from the processing control unit 119. Generate an FCD. The signal FCD generated in this way is sent to the delay correction unit 232.
- the frequency characteristic correction unit 231 includes individual frequency characteristic correction means such as an equalizer means prepared for each of the individual signals SND L to SND SR .
- the frequency characteristic correction command FCC includes individual frequency characteristic correction commands FCC L to FCC SR corresponding to the individual signals SND L to SND SR .
- the delay correction unit 232 receives the signal FCD from the frequency characteristic correction unit 231. Then, the delay correction unit 232 generates a signal DCD including the individual signals DCD L to DCD SR obtained by delaying each of the individual signals FCD L to FCD SR in the signal FCD according to the delay control command DLC from the processing control unit 119. . The signal DCD generated in this way is sent to the volume correction unit 233.
- the delay correction unit 232 includes individual variable delay means prepared for each of the individual signals FCD L to FCD SR .
- the delay control command DLC includes individual delay control commands DLC L to DLC SR corresponding to the individual signals FCD L to FCD SR , respectively.
- the volume correction unit 233 receives the signal DCD from the delay correction unit 232. Then, the volume correction unit 233 generates a signal APD including individual signals APD L to APD SR obtained by correcting the volume of each of the individual signals DCD L to DCD SR in the signal DCD according to the volume correction command VLC from the processing control unit 119. To do. The signal APD generated in this way is sent to the signal selection unit 114.
- volume correction unit 233 is configured to include individual volume correction means such as variable attenuation means prepared for each of the individual signals DCD L to DCD SR .
- the volume correction command VLC includes individual volume correction commands VLC L to VLC SR corresponding to the individual signals DCD L to DCD SR .
- the signal selection unit 114 receives the signal UAD from the reception processing unit 111 and the signal APD from the sound field correction unit 113. Then, the signal selection unit 114 selects one of the signal UAD and the signal APD according to the signal selection designation SL2 from the processing control unit 119, and sends it to the DA conversion unit 115 as the signal AOD.
- the signal AOD includes individual signals AOD L to AOD SR corresponding to the L to SR channels.
- the DA conversion unit 115 includes four DA converters.
- the DA conversion unit 115 receives the signal AOD from the signal selection unit 114. Then, the DA conversion unit 115 DA-converts each of the individual signals AOD L to AOD SR included in the signal AOD to generate an analog signal ACS.
- the signal ACS thus generated is sent to the amplifying unit 116.
- the amplifying unit 116 includes four power amplifying units.
- the amplifier 116 receives the signal ACS from the DA converter 115. Then, the amplifying unit 116 power-amplifies each of the individual signals ACS L to ACS SR included in the signal ACS to generate an output audio signal AOS.
- the processing control unit 119 performs various processes to control the operation of the acoustic signal processing apparatus 100. As shown in FIG. 6, the processing control unit 119 includes a correction measurement unit 291 as a measurement unit and a correction control unit 295.
- Additional corrective measurement unit 291 under control of the correction control unit 295, the acoustic signal UAS is generated by the sound source device 920 0 based on measuring speech content recorded in the measurement recording medium, reception processing unit The signal UAD obtained by AD conversion in 111 is analyzed, and the mode of the sound field correction processing in the sound source device 920 0 is measured.
- the corrected measurement result AMR which is a measurement result by the correction measurement unit 291, is reported to the correction control unit 295.
- frequency characteristic correction processing refers to frequency characteristic correction processing performed on each of the individual acoustic signals corresponding to the L to SR channels in the original acoustic signal.
- synchronization correction process refers to a process for correcting the audio output timing from each of the speaker units 910 L to 910 SR .
- volume balance correction process refers to a process for correcting a balance between speaker units regarding the output volume from each of the speaker units 910 L to 910 SR .
- the sound field correction process is performed in the tone generator 920 0, as a result of the synchronization correction process in the sound field correction process, for example, in FIG. 8
- the acoustic signal UAS including the individual acoustic signals UAS L to UAS SR as shown is supplied to the control unit 110.
- the period T P is synchronized in the sound source device 920 0 correction processing by the individual acoustic signals UAS L ⁇ maximum delay time difference T DM supposed speculative maximum time difference and a is the maximum value of the delay time difference that is applied to the UAS SR
- the time is longer than twice the time of TMM .
- the correction measurement unit 291 the first after the detection of the pulse, analyzing a pulse in the individual acoustic signals UAS L ⁇ UAS SR after a lapse of period T P / 2 for any of the individual acoustic signals UAS L ⁇ UAS SR as a target, measuring the aspects of the synchronization correction process in the sound source device 920 0.
- the pulse to be analyzed is the synchronization signal. Since the detection is performed in the order of small delay times due to the correction processing, the correction measurement unit 291 can correctly measure the mode of the synchronous correction processing.
- the period T P and the assumed maximum time difference T MM are determined in advance based on experiments, simulations, experiences, and the like from the viewpoint of measuring a correct and quick mode of synchronous correction processing.
- the correction control unit 295 performs control processing corresponding to the user's operation input received as the operation input data IPD from the operation input unit 160.
- the correction control unit 295 receives the sound based on the designated acoustic signal from the speaker.
- Signal selection designations SL1 and SL2 required to be output from units 910 L to 910 SR are sent to signal selection sections 112 and 114.
- the correction control unit 295 sends a signal selection designation SL2 to the signal selection unit 114 indicating that the signal UAD should be selected.
- the signal selection designation SL1 is not issued.
- the correction control unit 295 sends the signal selection designation SL1 to the effect that the signal ND1 should be selected to the signal selection unit 112, and signals that the signal APD should be selected.
- the signal is sent to the signal selection unit 114 as the selection designation SL2.
- the correction control unit 295 sends the signal selection designation SL1 to the effect that the signal ND2 should be selected to the signal selection unit 112, and also signals that the signal APD should be selected.
- the signal is sent to the signal selection unit 114 as the selection designation SL2.
- the correction control unit 295 if the user inputs a measurement instruction aspects of the sound field correction processing by the sound source device 920 0 on the operation input unit 160, control measures the measurement start instruction to the correction measurement unit 291 signal AMC Send as.
- the user for each individual correction processing of the measurement object, after to perform the generation of the acoustic signal UAS based on a corresponding audio content to the sound source device 920 0, the operation input unit 160, the measurement object The type of correction processing is input. Each time the measurement related to the individual correction process is completed, the corrected measurement result AMR indicating the individual correction process for which the measurement has been completed is reported to the correction control unit 295.
- the correction control unit 295 receives the correction measurement result AMR as the measurement result of the individual correction process from the correction measurement unit 291, the correction control unit 295 has a mode similar to the mode of the measured individual correction process based on the correction measurement result AMR.
- a frequency characteristic correction command FCC, a delay control command DLC, or a volume correction command VLC necessary for the sound field correction unit 113 to perform the correction process on the signal SND is generated.
- the frequency characteristic correction command FCC, delay control command DLC, or volume correction command VLC generated in this way is sent to the sound field correction unit 113. Then, the type of the individual correction process and the fact that the measurement is completed are displayed on the display device of the display unit 150.
- step S11 the correction control unit 295 of the process control unit 119 determines whether or not the measurement command from the operation input unit 160 has been received. If this determination is negative (step S11: N), the process of step S11 is repeated.
- the sound source device 920 to initiate generation of an acoustic signal UAS based on the audio content corresponding to the individual correction processing to be measured. Subsequently, when the user inputs a measurement command specifying the individual correction process to be measured first, to the operation input unit 160, the fact is reported to the correction control unit 295 as operation input data IPD.
- step S11 Upon receiving this report, the result of determination in step S11 becomes affirmative (step S11: Y), and the process proceeds to step S12.
- step S12 the correction control unit 295 sends a measurement start command specifying the individual measurement process specified in the measurement command by the user to the correction measurement unit 291 as the measurement control signal AMC.
- the correction measurement unit 291 measures the aspect of the individual correction process specified in the measurement start command.
- the correction measurement unit 291 collects the signal levels of the individual signals UAD L to UAD SR in the signal UAD from the reception processing unit 111 over a predetermined time. And the correction measurement part 291 analyzes the collection result, and measures the aspect of the said individual correction process.
- the correction measurement unit 291 first determines the signal level for each of the individual signals UAD L to UAD SR based on the collection result. The frequency distribution of is calculated. Then, the correction measurement unit 291 analyzes the calculation result of the frequency distribution and measures the mode of the frequency characteristic correction process. This measurement result is reported to the correction control unit 295 as the corrected measurement result AMR.
- the correction measurement unit 291 first starts collection, and one of the individual signals UAD L to UAD SR is first determined in advance. The timing when the signal state is higher than the level is specified. Then, the correction measurement unit 291 specifies the timing at which each of the individual signals UAD L to UAD SR becomes a signaled state after the time T P / 2 has elapsed from the specified timing. Based on the result, the correction measurement unit 291 measures the mode of the synchronization correction process. This measurement result is reported to the correction control unit 295 as the corrected measurement result AMR.
- the correction measurement unit 291 When the individual correction process specified in the measurement start command is a volume balance correction process, the correction measurement unit 291 first determines an average signal for each of the individual signals UAD L to UAD SR based on the collection result. Calculate the level. Then, the correction measurement unit 291 analyzes the signal level difference between the individual signals UAD L to UAD SR and measures the volume balance correction process. This measurement result is reported to the correction control unit 295 as the corrected measurement result AMR.
- step S14 the correction control unit 295 that has received the report of the corrected measurement result AMR performs an individual correction process in the same manner as the corrected measurement result AMR in the sound field correction unit 113 based on the corrected measurement result AMR.
- the set value of is calculated. For example, when receiving the correction measurement result AMR regarding the mode of the frequency characteristic correction process, the correction control unit 295 calculates a set value to be set in the frequency characteristic correction unit 231 in the sound field correction unit 113. Further, when receiving the correction measurement result AMR related to the mode of the synchronization correction processing, the correction control unit 295 calculates a setting value to be set in the delay correction unit 232 in the sound field correction unit 113. When receiving the correction measurement result AMR related to the aspect of the volume balance correction process, the correction control unit 295 calculates a setting value to be set in the volume correction unit 233 in the sound field correction unit 113.
- the correction control unit 295 sends the set value calculation result to the corresponding one of the frequency characteristic correction unit 231, the delay correction unit 232, and the volume correction unit 233.
- a frequency characteristic correction command FCC specifying a set value is sent to the frequency characteristic correction unit 231.
- a delay control command DLC designating a set value is sent to the delay correction unit 232.
- a volume correction command VLC specifying a set value is sent to the volume correction unit 233.
- the correction control unit 295 displays the fact on the display device of the display unit 150.
- the correction control unit 295 When the user inputs designation of the type of acoustic signal corresponding to the sound reproduced and output from the speaker units 910 L to 910 SR to the operation input unit 160, the fact is reported to the correction control unit 295 as operation input data IPD. Receiving this report, the correction control unit 295 sends the signal selection designations SL1 and SL2 necessary for outputting the sound based on the designated acoustic signal from the speaker units 910 L to 910 SR to the signal selection units 112 and 114. .
- the correction control unit 295 sends a signal selection designation SL2 to the signal selection unit 114 to select the signal UAD.
- the signal selection designation SL1 is not issued.
- output audio signals AOS L to AOS SR similar to the acoustic signal UAS are supplied to the speaker units 910 L to 910 SR .
- the correction control unit 295 sends the signal selection designation SL1 indicating that the signal ND1 should be selected to the signal selection unit 112 and also indicates that the signal APD should be selected.
- the signal selection unit 114 As a result, the measurement of all aspects of the individual sound field processing in aspects of the sound field correction process in the sound source device 920 0 as described above, for all the individual sound field correction processing to the sound field correction section 113 based on the measurement result After the setting, the sound field correction process similar to the sound field correction process in the sound source device 920 0 is performed on the sound signal NAS for the speaker units 910 L to 910 SR .
- the output audio signals AOS L to AOS SR are supplied to the speaker units 910 L to 910 SR .
- the correction control unit 295 sends the signal selection designation SL1 indicating that the signal ND2 should be selected to the signal selection unit 112 and also indicates that the signal APD should be selected.
- the signal selection unit 114 As a result, the measurement of all aspects of the individual sound field processing in aspects of the sound field correction process in the sound source device 920 0 as described above, for all the individual sound field correction processing to the sound field correction section 113 based on the measurement result After the setting, the sound field correction process similar to the sound field correction process in the sound source device 920 0 is performed on the sound signal NAD for the speaker units 910 L to 910 SR and generated.
- the output audio signals AOS L to AOS SR are supplied to the speaker units 910 L to 910 SR .
- the correction measurement unit 291 measures the sound source device 920 0 processing control unit 119 of the embodiment of the sound field correction process has been applied to the acoustic signal UAS received from a specific external device To do.
- the acoustic signal NAS or the acoustic signal NAD other than the acoustic signal UAS is selected as the acoustic signal supplied to the speaker units 910 L to 910 SR , the above measurement is performed on the selected acoustic signal. An acoustic signal subjected to the sound field correction processing according to the aspect is generated.
- the output audio signals AOS L to AOS SR are supplied to the speaker units 910 L to 910 SR in a state where the unified sound field correction processing has been performed. can do.
- the maximum assumed that is assumed as the maximum delay time difference T DM is the maximum value of the delay time difference that is applied to the individual acoustic signals UAS L ⁇ UAS SR by the synchronization correction process in the sound source device 920 0
- the time is longer than twice the time difference TMM .
- the generation timing of the acoustic signal UAD for measurement of the synchronization correction process and the collection timing of the signal UAD by the correction measurement unit 291 are initially shifted. Even when the gone, by analyzing the changes in the signal UAD in after correcting the measurement unit 291 is no signal period of the signal UAD is the duration T P / 2 or more, aspects of the synchronization correction process in the sound source device 920 0 Can be measured correctly.
- the types of individual sound field correction in the above-described embodiment are examples, and the types of individual sound field correction can be reduced, or other types of individual sound field correction can be added.
- the pink noise sound is used in the measurement of the frequency characteristic correction processing mode and the volume balance correction processing mode.
- a white noise sound may be used.
- a half wave sine wave an impulse wave, a triangular wave, a sawtooth wave, a spot sine wave, or the like can be employed.
- the user designates the type of individual sound field correction to be measured for each measurement of the individual sound field correction processing.
- the acoustic signal for measurement in the sound source device 9200 is specified.
- the measurement of the three types of individual sound field processing may be automatically performed in a predetermined order.
- the form of the acoustic signal in the above embodiment is an exemplification, and the present invention can also be applied when receiving an acoustic signal of another form.
- the number of acoustic signals that are not subjected to sound field correction can be any number.
- the 4-channel surround system is adopted and the four speaker units are provided.
- the audio signal that is the read result of the audio content is appropriately separated or mixed, and two or more and three or less.
- the present invention can be applied to an acoustic signal processing device that outputs sound from five or more speakers.
- the control unit in the above embodiment is configured as a computer system including a central processing unit (CPU: Central Processor Unit) and a DSP (Digital Signal Processor), and the functions of the control unit are realized by executing a program. You can also. These programs may be acquired in the form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in the form of delivery via a network such as the Internet. Good.
- CPU Central Processor Unit
- DSP Digital Signal Processor
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Abstract
Description
図1には、一実施形態に係る音響信号処理装置100の概略的な構成がブロック図にて示されている。なお、以下の説明においては、音響信号処理装置100は、車両CR(図2参照)に搭載される装置であるものとする。また、この音響信号処理装置100は、マルチチャンネルサラウンド方式の1つである4チャンネルサラウンド方式の音響信号に対する処理を行うものとする。4チャンネルサラウンド方式の音響信号とは、レフトチャンネル(以下、「Lチャンネル」という)、ライトチャンネル(以下、「Rチャンネル」という)、サラウンドレフトチャンネル(以下、「SLチャンネル」という)及びサラウンドライトチャンネル(以下、「SRチャンネル」という)の4チャンネル構成の音響信号をいうものとする。
次に、上記のように構成された音響信号処理装置100の動作について、主に処理制御部119における処理に着目する。
まず、音源装置9200による音場補正処理の態様の計測及び音場補正部113の設定の処理について説明する。
次に、スピーカユニット910L~910SRから再生出力する音声の選択処理について説明する。
本発明は、上記の実施形態に限定されるものではなく、様々な変形が可能である。
Claims (10)
- 複数のスピーカに供給する音響信号を生成する音響信号処理装置であって、
複数の外部機器のそれぞれから音響信号を受信する受信手段と;
前記複数の外部機器のうちの特定の外部機器から受信した音響信号に施されている音場補正処理の態様を計測する計測手段と;
前記複数のスピーカへ供給される音響信号として、前記特定の外部機器以外の外部機器から受信した音響信号が選択された場合に、前記選択された音響信号に対して、前記計測手段により計測された態様の音場補正処理が施された音響信号を生成する生成手段と;
を備えることを特徴とする音響信号処理装置。 - 前記計測手段は、前記特定の外部機器が計測用音声コンテンツから生成した音響信号を解析することにより、前記音場補正処理の態様を計測する、ことを特徴とする請求項1に記載の音響信号処理装置。
- 前記特定の外部機器は、移動体に搭載され、
前記特定の外部機器から受信した音響信号は、前記移動体内部の音場空間に応じた音場補正処理が原音響信号に対して施された音響信号である、
ことを特徴とする請求項1又は2に記載の音響信号処理装置。 - 前記音場補正処理には、前記複数のスピーカのそれぞれからの音声出力タイミングを補正する同期補正処理が含まれる、ことを特徴とする請求項1~3のいずれか一項に記載の音響信号処理装置。
- 前記音場補正処理に含まれる同期補正処理の態様を前記計測手段により計測する際には、前記特定の外部機器からの音響信号に対応する原音響信号における前記複数のスピーカのそれぞれに対応する原個別音響信号として、前記同期補正処理において前記原個別音響信号のそれぞれに付与される遅延時間の相互間における最大遅延時間差の2倍よりも長い周期で同時に発生するパルス状の信号が使用され、
前記計測手段は、前記特定の外部機器からの音響信号における個別音響信号のいずれかについて最初にパルス状の信号が検出された時点から、前記周期の1/2の時間が経過した後における前記特定の外部機器からの音響信号に基づいて、前記同期補正処理の態様を計測する、
ことを特徴とする請求項4に記載の音響信号処理装置。 - 前記音場補正処理には、前記複数のスピーカのそれぞれからの出力音量のスピーカ間におけるバランスを補正する音量バランス補正処理、及び、前記複数のスピーカのそれぞれに供給される音響信号の周波数特性を補正する周波数特性補正処理の少なくとも一方が含まれる、ことを特徴とする請求項1~5のいずれか一項に記載の音響信号処理装置。
- 前記複数の外部機器における前記特定の外部機器以外から受信する音響信号は、音場補正処理が施されていない無補正音響信号である、ことを特徴とする請求項1~6のいずれか一項に記載の音響信号処理装置。
- 複数のスピーカに供給する音響信号を生成する音響信号処理方法であって、
複数の外部機器における特定の外部機器から受信した音響信号に施されている音場補正処理の態様を計測する計測工程と;
前記複数のスピーカへ供給される音響信号として、前記特定の外部機器以外の外部機器から受信した音響信号が選択された場合に、前記選択された音響信号に対して、前記計測工程において計測された態様の音場補正処理が施された音響信号を生成する生成工程と;
を備えることを特徴とする音響信号処理方法。 - 請求項8に記載の音響信号処理方法を演算手段に実行させる、ことを特徴とする音響信号処理プログラム。
- 請求項9に記載の音響信号処理プログラムが、演算手段により読み取り可能に記録されている、ことを特徴とする記録媒体。
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