JP2009017331A - Voice processor, voice processing method, voice processing program, and its recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve comfortable communication and talking between speakers. <P>SOLUTION: A test signal generation part 220 successively generates a test voice signal by voice output setting following the candidates of a plurality of reception voice reproduction conditions configured of the combination of a selection speaker to be selected for the reproduction output of a received voice and a sound volume to be outputted from the selection speaker. A test voice is collected by a sound collection unit, and the sound collection result is transmitted to an echo detection part 250. The echo detection part 250 detects the echo volume of the test voice, and transmits it to an optimal condition determination part 261. The optimal condition determination part 261 determines the optimal conditions for minimizing sneak echo from the speaker of the received voice to a microphone from among the candidates of the received sound reproduction conditions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a voice processing device, a voice processing method, a voice processing program, and a recording medium on which the voice processing program is recorded.

  In recent years, communication calls using mobile communication terminals such as mobile phones have become indispensable for daily life. For this reason, attention is being paid to so-called hands-free calling, which allows a communication call by a mobile communication terminal device to be performed without hindering driving operation even during driving of a vehicle.

  Various in-vehicle devices that can perform such a hands-free call include those that can switch between a hands-free call and a handset call (see Patent Document 1: hereinafter referred to as “Conventional Example 1”). Proposed. A device capable of hands-free calling includes a microphone that collects transmission sound and a speaker that outputs reception sound. Compared to a normal telephone device, the sound output from the speaker is a microphone. Echo phenomenon that is collected easily occurs.

  For this reason, many of the in-vehicle hands-free communication devices are equipped with an echo canceller. As such an echo canceller, for example, a technique has been proposed in which noise other than a transmission voice band is extracted from a transmission voice signal by a band elimination filter and an echo is estimated based on a signal obtained by adding the extraction result to a reception voice signal. (Refer to Patent Document 2; referred to as “Conventional Example 2”).

JP 2003-78607 A Japanese Patent No. 2919422

  By the way, in recent years, many vehicles are equipped with an audio device including a plurality of speakers for audio stereo output and multi-channel output. When hands-free call communication is realized in such a vehicle, it is conceivable to use a plurality of speakers of the acoustic device.

  In such a case, at the time of a communication call, it is the simplest method to output the received sound at the same volume from all of the plurality of speakers. However, with this method, it has been difficult to sufficiently remove the wraparound echo from the plurality of speakers to the microphone by using only the echo canceller as in the conventional example 2 while ensuring the audibility for the user.

  For this reason, in the case where a plurality of speakers are provided, there has been a strong demand for a technique that can reduce the wraparound echo from the speaker of the received voice to the microphone. Meeting this requirement is one of the problems to be solved by the present invention.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a new voice processing apparatus and voice processing method capable of performing a comfortable communication call between callers.

  The invention according to claim 1 is a voice processing device having a call communication function, which collects a voice emitted for a call with the outside and converts it into a transmission voice signal; A plurality of speakers that reproduce and output received audio based on the received audio signal; at least one selected speaker selected for reproduction output from among the plurality of speakers when reproducing the received audio; and the selected speaker Storage means for storing a plurality of reception sound reproduction condition candidates composed of a combination with the volume of the output sound; and test sounds generated internally in accordance with each of the plurality of reception sound reproduction condition candidates, sequentially, Test sound output control means for reproducing and outputting from the selected speaker; and detecting an echo amount of the sound collected by the sound collecting means due to the reproduction output of the test sound Code detecting means; and optimum condition determining means for determining an optimum condition from among the plurality of received voice reproduction condition candidates based on a detection result by the echo detection means corresponding to each of the plurality of received voice reproduction condition candidates. And a condition setting means for setting the optimum condition as a received voice reproduction condition during a call communication.

  According to a sixth aspect of the present invention, there is provided sound collecting means for collecting a voice emitted for a call with the outside and converting it into a transmission voice signal; and reproducing and outputting the received voice based on the received voice signal from the outside. A plurality of speakers, each of which is a combination of at least one selected speaker selected for reproduction output from among the plurality of speakers and the volume of the sound output from the selected speaker. Is a voice processing method used in a voice processing device comprising a storage means storing received voice playback condition candidates, and internally generated test voices according to each of the plurality of received voice playback condition candidates, A test sound output step of sequentially reproducing and outputting from the selected speaker; and an echo amount of the sound collected by the sound collecting means due to the reproduction output of the test sound An echo detection step to detect; and an optimum condition determination for determining an optimum condition from among the plurality of received voice reproduction condition candidates based on a detection result in the echo detection step corresponding to each of the plurality of received voice reproduction condition candidates And a condition setting step of setting the optimum condition as a reception voice reproduction condition during a call communication.

  A seventh aspect of the present invention is a voice processing program characterized by causing a calculation means to execute the voice processing method according to the sixth aspect.

  The invention according to claim 8 is a recording medium on which the sound processing program according to claim 7 is recorded so as to be readable by the arithmetic means.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description and drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

[Constitution]
FIG. 1 is a block diagram illustrating a schematic configuration of a speech processing apparatus 100 according to an embodiment. In the following description, it is assumed that the voice processing device 100 is a device mounted on the vehicle CR (see FIG. 2). The voice processing device 100 performs wireless communication with the mobile phone device 900. It is assumed that the voice processing device 100 can perform hands-free call communication with a call partner via the mobile phone device 900 and a mobile communication network.

  As shown in FIG. 1, the sound processing apparatus 100 includes a control unit 110 and a drive unit 120.

In addition, the sound processing apparatus 100 includes a sound output unit 130 _L , a sound output unit 130 _R , a sound output unit 130 _SL, and a sound output unit 130 _SR .

Here, the sound output unit 130 _L includes a left speaker 131 _L (hereinafter also referred to as “L speaker”), and the sound output unit 130 _R includes a right speaker 131 _R (hereinafter also referred to as “R speaker”). ing. The sound output unit 130 _SL has a surround left speaker 131 _SL (hereinafter also referred to as “SL speaker”), and the sound output unit 130 _SR has a surround right speaker 131 _SR (hereinafter also referred to as “SR speaker”). is doing.

  Furthermore, the sound processing apparatus 100 includes a sound collection unit 140 as sound collection means, a display unit 150, an operation input unit 160, a storage device 170 such as a hard disk device as storage means, and an antenna 180. .

  Elements 120 to 180 other than the control unit 110 are connected to the control unit 110.

  The control unit 110 performs overall control of the entire voice processing apparatus 100. Details of the control unit 110 will be described later.

  When the compact disc CD on which the audio content is recorded is inserted, the drive unit 120 reports that fact to the control unit 110. When the drive unit 120 receives the audio content reproduction command DVC from the control unit 110 in a state where the compact disc CD is inserted, the drive unit 120 reads the audio designated for reproduction from the compact disc CD. The result of reading out the audio content is sent to the control unit 110 as content data CTD that is an audio signal.

Each of the sound output units 130 _{L to} 130 _SR includes an amplifier that amplifies the audio output signals AOS _{L to} AOS _SR received from the control unit 110 in addition to the speakers 131 _{L to} 131 _SR described above. These sound output units 130 _{L to} 130 _SR are controlled by the control unit 110 under the control of the control unit 110, and the sound corresponding to the received voice signal from the other party through the mobile communication network and the mobile phone device 900. Audio, music, etc. corresponding to the generated test audio signal are reproduced and output.

In the present embodiment, as shown in FIG. 2, the left speaker 131 _L of the sound output unit 130 _L is disposed in the front door housing on the passenger seat side. The left speaker 131 _L is disposed so as to face the passenger seat side.

The light speaker 131 _R of the sound output unit 130 _R is disposed in the front door housing on the driver's seat side. The light speaker 131 _R is arranged to face the driver's seat side.

Surround left speakers 131 _SL of the sound output unit 130 _SL is arranged in the housing of the front passenger's seat side rear. The surround left speaker 131 _SL is disposed so as to face the rear seat on the passenger seat side.

Surround right speakers 131 _SR sound output unit 130 _SR is arranged in the housing of the driver's side rear. The surround light speaker 131 _SR is arranged so as to face the rear seat on the driver's seat side.

  Returning to FIG. 1, the sound collection unit 140 includes (i) a microphone 141 that collects ambient sounds to be an electrical analog audio signal, (ii) an amplifier that amplifies the analog audio signal output from the microphone, (iii) ) An AD converter (Analog to Digital Converter) that converts the amplified analog audio signal into a digital audio signal. Here, as shown in FIG. 2, the microphone 141 is disposed in front of the driver's seat, and the directivity thereof is radial toward the rear seat. The sound collection result by the sound collection unit 150 is reported to the control unit 110 as sound collection result data AAD.

  Returning to FIG. 1, the display unit 150 includes (i) a display device 151 such as a liquid crystal panel, an organic EL (Electro Luminescence) panel, a PDP (Plasma Display Panel), and (ii) display control data sent from the control unit 110. And a display controller such as a graphic renderer for controlling the entire display unit 150, and (iii) a display image memory for storing display image data. When the display unit 150 is controlled by the control unit 110, an operation guidance for voice reproduction using the drive unit 120, a telephone number of a communication partner in a communication call, and a name corresponding to the telephone number are registered. Displays the name of the other party, the call duration, and the like.

  The operation input unit 160 includes a key unit provided in the main body of the voice processing device 100, or a remote input device including the key unit. Here, a touch panel provided on the display device 151 of the display unit 150 can be used as the key part provided on the main body. In addition, it can replace with the structure which has a key part, and the structure which inputs voice can also be employ | adopted.

  When the user operates the operation input unit 160, the operation content of the voice processing apparatus 100 is set. For example, the user uses the operation input unit 160 to set the received audio playback condition information 171 (to be described later), play back audio content, and the like. Such input contents are sent from the operation input unit 160 to the control unit 110 as operation input data IPD.

  The storage device 170 includes a hard disk device that is a nonvolatile storage device. In the storage device 170, various pieces of information such as the received audio reproduction condition information 171 are stored.

The received audio reproduction condition information 171 is a plurality of combinations of a selected speaker selected for reproduction output from the speakers 131 _{L to} 131 _SR and a volume of audio output from the selected speaker when the received audio is reproduced. The received audio playback condition candidate (hereinafter also referred to as “preset”). An example of the received audio reproduction condition information 171 is shown in FIG. In FIG. 3, for example, the preset (P = 1) is a preset in which the selected speaker is an L speaker and an R speaker arranged in front of the vehicle CR, and the volume level of the sound output from the speaker is 6. The preset (P = 2) is a preset in which the selected speaker is an SL speaker and an SR speaker disposed behind the vehicle CR, and the volume level of the sound output from the speaker is 6. In the present embodiment, the sound volume level is 0 to 10.

  Returning to FIG. 1, the antenna 180 receives a radio signal from the mobile phone device 900 and transmits the radio signal toward the mobile phone device 900. A reception result by the antenna 180 is output to the control unit 110 as a reception audio signal RES. The antenna 180 receives the transmission audio signal TRS from the control unit 110 and transmits a radio signal corresponding to the transmission audio signal TRS to the mobile phone device 900.

  As described above, the control unit 110 performs overall control of the entire voice processing apparatus 100. As shown in FIG. 4, the control unit 110 includes a control processing unit 111, an audio processing unit 112, and a call voice processing unit 113. The control unit 110 also includes an analog conversion unit 114, an output signal selection unit 115, and a volume adjustment unit 116.

  The control processing unit 111 controls the audio processing unit 112, the call voice processing unit 113, the output signal selection unit 115, and the volume adjustment unit 116 based on a command input or the like input to the operation input unit 160. In addition, the control processing unit 111 controls the drive unit 120 and the display unit 150. The control processing unit 111 will be described later.

The audio processing unit 112 automatically reproduces content when the operation input unit 160 reports that a content to be reproduced including audio content has been input and when the compact disc CD is inserted into the drive unit 120. When the setting to be performed is made, the content data CTD corresponding to the content to be reproduced is read out from the drive unit 120 and expanded in accordance with the audio content processing control command APC from the control processing unit 111, and the digital sound data signal Is generated. Subsequently, the audio processing unit 112 analyzes the generated digital sound data signal, and converts the digital sound data signal into the above-described speakers 131 _L , 131 _R , 131 _SL , 131 according to the channel designation information included in the digital sound data signal. Separated to be supplied to each _SR . The signals thus separated are output to the analog conversion unit 114 as channel processing signals PCD _L , PCD _R , PCD _SL , and PCD _SR .

  The call voice processing unit 113 processes call voices with the mobile phone device 900 and the mobile communication network. As shown in FIG. 5, the call voice processing unit 113 includes a communication interface unit 210, a test signal generation unit 220, and a signal switching unit 230. The call voice processing unit 113 includes an echo cancellation unit 240 as an echo cancellation unit and an echo detection unit 250 as an echo detection unit.

  The communication interface unit 210 is used for signal exchange with the mobile phone device 900. The communication interface unit 210 includes a receiving unit 211 and a transmitting unit 212.

  The receiving unit 211 receives the received audio signal RES from the mobile phone device 900. Then, the reception unit 211 converts the reception audio signal RES into a reception signal RED for internal processing and outputs it to the signal switching unit 230. The receiving unit 211 detects the incoming and outgoing calls of the call communication based on the received audio signal RES, and outputs the detection result to the control processing unit 111 as an incoming call instruction REI.

  The transmission unit 212 receives the transmission signal TRD from the echo cancellation unit 240. Then, the transmission unit 212 converts the transmission signal TRD into a transmission audio signal TRS for transmission to the mobile phone device 900, and outputs it to the mobile phone device 900.

  When the test signal generation unit 220 receives a test signal generation command SGC indicating that a test audio signal should be generated from the control processing unit 111, the test signal generation unit 220 generates a test audio signal SGD. The test audio signal SGD generated in this way is sent to the signal switching unit 230.

  The signal switching unit 230 includes a switch element. This switch element has an A terminal and a B terminal as input terminals and a C terminal as an output terminal. A terminal A is a terminal connected to the reception unit 211, and a B terminal is a terminal connected to the test signal generation unit 220. The terminal A receives the reception signal RED, and the terminal B receives the test audio signal SGD. And according to the instruction | command RSC from the control processing part 111, A terminal and C terminal are conduct | electrically_connected, B terminal and C terminal are conduct | electrically_connected, Furthermore, both A terminal and B terminal conduct | electrically connect C terminal. There is not. From the C terminal, the selected signal is sent to the analog conversion unit 114 as the signal RSD and also sent to the echo cancellation unit 240.

  The echo cancellation unit 240 is for removing an echo sound component included in the sound collection result data AAD during a communication call. As shown in FIG. 6, the echo canceling unit 240 includes a switch 241, an adaptive filter 242 as filter means, and a subtractor 243 as subtraction means.

  The switch element 241 has an input terminal A and an output terminal B. The switch element 241 is provided on a signal transmission path through which the transmission signal TRD output from the subtracter 243 is sent to the adaptive filter 242 in order to calculate the filter coefficient of the adaptive filter 242. The on / off operation of the switch element 241 is performed according to a command ECC from the control processing unit 111.

  The adaptive filter 242 includes a coefficient update unit and a filter unit (not shown). The coefficient updating unit calculates the filter coefficient of the adaptive filter 242 so that the power of the transmission signal TRD output from the subtractor 243 is minimized by a learning identification method such as an LMS (Least Mean Square) algorithm, and this filter coefficient Repeat the process of setting to the filter section. The filter unit is an FIR filter having an impulse response determined by the coefficient set by the coefficient updating unit. This filter unit generates a pseudo echo signal ECD from the signal RSD. The pseudo echo signal ECD generated in this way is sent to the subtracter 243.

  The subtractor 243 subtracts the pseudo echo signal ECD from the sound collection result data AAD from the sound collection unit 140. The subtraction result is sent as a transmission signal TRD toward the transmission unit 212 and also sent toward the echo detection unit 250.

  Returning to FIG. 5, the echo detection unit 250 detects the echo amount of the transmission signal TRD transmitted from the echo cancellation unit 240. The detection result is sent from the echo detection unit 250 to the control processing unit 111 as an echo amount value EVD.

Returning to FIG. 4, the analog conversion unit 114 receives channel processing signals PCD _{L to} PCD _SR which are digital signals from the audio processing unit 112 and a signal RSD which is a digital signal from the call voice processing unit 113. Then, the analog conversion unit 114 converts the channel processing signals PCD _{L to} PCD _SR received from the audio processing unit 112 into analog signals PCS _{L to} PCS _SR, and converts the signal RSD received from the call voice processing unit 113 into the analog signal RSS. Convert. The analog conversion unit 114 includes five DA (Digital to Analogue) converters configured similarly to each other corresponding to the five types of digital signals. Analog signals PCS _{L to} PCS _SR and RSS, which are conversion results by the analog conversion unit 114, are sent to the output signal selection unit 115.

The output signal selection unit 115 receives the analog signals PCS _{L to} PCS _SR and RSS from the analog conversion unit 114. Then, the output signal selection unit 115 supplies the analog signals PCS _{L to} PCS _SR , supplies the analog signal RSS to the volume adjustment unit 116 according to the output signal selection command ODS from the control processing unit 111, and It is selected whether or not to supply the signal. As shown in FIG. 7, the output signal selection unit 115 having such a function includes four switch elements 115 _{L to} 115 _SR .

Each of the switch elements 115 _{L to} 115 _SR has an A terminal and a B terminal as input terminals, and a C terminal as an output terminal. Terminals A and B are terminals connected to the analog conversion unit 114. A terminal C is a terminal connected to the volume adjusting unit 116. Each switching element 115 _{L to} 115 _SR receives analog signals PCS _{L to} PCS _SR at the A terminal and receives analog signal RSS at the B terminal. Then, according to the individual output selection commands ODS _{L to} ODS _SR in the output signal selection command ODS from the control processing unit 111, the A terminal and the C terminal are made conductive, the B terminal and the C terminal are made conductive, Neither the A terminal nor the B terminal conducts the C terminal. From the C terminal of the switch element 115 _L to 115 _SR, it is selected signal (including a no-signal) and sent toward the volume adjusting unit 116 as the sound output select signal PBS _L ~PBS _SR.

Returning to FIG. 4, the volume adjustment unit 116 receives the sound output selection signals PBS _{L to} PBS _SR from the output signal selection unit 115. The volume adjusting unit 116 can adjust the volume independently of each other by a so-called electronic volume or the like for each of the sound output selection signals PBS _{L to} PBS _SR .

The volume adjustment unit 116 performs volume adjustment according to the volume adjustment commands VLC _{L to} VLC _SR from the control processing unit 111 for each of the sound output selection signals PBS _{L to} PBS _SR . The adjustment result is output to the sound output units 130 _{L to} 130 _SR as audio output signals AOS _{L to} AOS _SR .

  The control processing unit 111 exerts the function of the sound processing apparatus 100 while controlling the other components described above. As shown in FIG. 8, the control processing unit includes an optimum condition determining unit 261 as an optimum condition determining unit, and a control unit 262 as a test sound output control unit, a condition setting unit, and an echo cancellation control unit. Yes.

  The optimum condition determination unit 261 determines the optimum condition from the received voice reproduction condition candidates set in the received voice reproduction condition information 171 when the received voice is output. The optimum condition determination unit 261 performs processing only in an “optimum condition determination mode” described later.

  When receiving the processing command DMC from the control unit 262, the optimum condition determination unit 261 acquires the echo amount value EVD sent from the echo detection unit 250 and stores the echo amount value EVD in a memory (not shown). . The echo amount value EVD is sequentially sent from the echo detection unit 250 by the number of reception sound reproduction condition candidates (the number of presets P). Then, the optimum condition determination unit 261 sequentially determines a preset P value when the echo amount value EVD is minimized from the echo amount values EVD that are sent. The preset P value determined in this way is sent to the control unit 262 as a value PBD.

  The control unit 262 controls the operation of the two modes of “content reproduction mode” and “call mode” in the audio processing device 100. Here, the “content playback mode” is a mode in which audio content is read from a compact disc CD and an audio signal is played back. The “call mode” is a mode for performing a communication call with the outside via the mobile phone device 900 and the mobile communication network. There are two types of “call mode”: “normal call mode” in which a normal call is made and “optimum condition determination mode” in which an optimum condition is determined from candidates for a received voice reproduction condition.

  The control unit 262 normally controls the operation of the “content reproduction mode”. Then, the control unit 262 starts the operation control of the “normal call mode” when receiving a call outgoing instruction from the operation input unit 160 and when receiving an incoming call instruction REI from the receiving unit 211. On the other hand, when the control unit 262 receives the call disconnect command from the operation input unit 160 in the state of the “normal call mode” and when the incoming call instruction REI from the reception unit 211 is interrupted, Return to "Mode" operation control. Note that the operation control in the “optimum condition determination mode” by the control unit 262 is performed only when an optimal condition determination command is received from the operation input unit 160.

  Here, switching between the “content reproduction mode” and the “call mode” is performed by a switch operation in the output signal selection unit 115. Further, switching between the “normal call mode” and the “optimum condition determination mode” is performed by a switch operation in the signal switching unit 230.

  In the operation control of the “optimum condition determination mode”, the control unit 262 first acquires the reception sound reproduction condition from the reception sound reproduction condition information 171. There are a plurality of candidates for the received voice reproduction condition (see FIG. 3), and the control unit 262 sets the voice processing apparatus 100 corresponding to the first (preset (P = 1)) candidate.

In this setting, the control unit 262 sends a command to the output signal selection unit 115 to select the signal RSS. More specifically, the B terminal and the C terminal of the switch element corresponding to the first measurement target speaker in the output signal selection unit 115 are electrically connected, and the C terminals of the other switch elements are connected to the A terminal and the B terminal. An output signal selection command ODS designating that neither of them is conducted is sent to the output signal selection unit 115. Referring to FIG. 3 as an example, the control unit 262 conducts the B terminal and the C terminal of the switch elements 115 _L and 115 _R corresponding to the L speaker and the R speaker, and switches the switch element 115 corresponding to the SL speaker and the SR speaker. An output signal selection command ODS that designates that the C terminal in _SL , 115 _SR is not conductive with either the A terminal or the B terminal is sent to the output signal selection unit 115.

  In this setting, the control unit 262 directs the signal switching unit 230 to select the test audio signal SGD from the test signal generation unit 220, that is, to connect the terminal B and the terminal C of the switch element. A command RSC for designating the transmission is sent (see FIG. 5).

  Further, at the time of this setting, the control unit 262 issues a command to the switch 241 that the transmission signal TRD from the subtractor 243 is not sent to the adaptive filter 242, that is, a command ECC that the switch 241 should be turned off. Send (see FIG. 6).

Further, in this setting, the control unit 262 sends volume adjustment commands VLC _L and VLC _R to the volume adjustment unit 116 to adjust the volume to be output from the L speaker and the R speaker to level 6.

  In this way, when the setting of the sound processing apparatus 100 corresponding to the preset (P = 1) candidate is completed, the control unit 262 then issues a test signal generation command SGC indicating that the test sound signal SGD should be generated. And sent to the test signal generator 220. Further, the control unit 262 sends a processing command DMC to the optimum condition determining unit 261 simultaneously with the test signal generation command SGC (see FIG. 8).

  When the control unit 262 receives the echo amount value EVD from the echo detection unit 250, the control unit 262 determines that the processing for the preset (P = 1) candidate is completed, and the audio processing device corresponding to the next preset (P = 2) candidate Set 100.

  After the detection of the echo amount value EVD for all the received audio reproduction condition candidates is completed, the control unit 262 receives a value PBD that is a preset of the optimum condition from the optimum condition determination unit 261. The value PBD is stored in a storage unit (not shown) in the control unit 262.

  Thus, when the optimum condition is determined from the received audio reproduction condition candidates, the control unit 262 ends the operation control of the “optimum condition determination mode”.

  As described above, the audio processing apparatus 100 normally controls the operation of the “content reproduction mode”. However, when receiving a call origination command from the operation input unit 160, the voice processing apparatus 100 receives an incoming call instruction from the receiving unit 211. When the REI is received, operation control of the “normal call mode” is started.

  In the operation control of the “normal call mode”, the control unit 262 first refers to the value PBD that is a preset of the optimum condition received from the optimum condition determination unit 261, and becomes the optimum condition from the received voice reproduction condition information 171. Received audio playback conditions (hereinafter simply referred to as “optimum conditions”) are acquired. Then, the voice processing device 100 corresponding to the optimum condition is set.

  In this setting, the control unit 262 sends an output signal selection command ODS to the output signal selection unit 115 indicating that a switch operation that can output the signal RSS from the selection speaker under the optimum condition is to be performed.

  In this setting, the control unit 262 instructs the signal switching unit 230 to select the reception signal RED from the reception unit 211, that is, to make the terminal A and the terminal C of the switch element conductive. A designated command RSC is sent (see FIG. 5).

  Further, at the time of this setting, the control unit 262 sends to the switch 241 an instruction to send the transmission signal TRD from the subtractor 243 to the adaptive filter 242, that is, an instruction ECC to turn on the switch 241. (See FIG. 6).

Furthermore, in this setting, the control unit 262 sends volume adjustment commands VLC _{L to} VLC _R to the volume adjustment unit 116 to adjust the volume to be output from the selected speaker to the optimum condition level.

In the operation control of the “content reproduction mode”, the control unit 262 outputs, to the output signal selection unit 115, an instruction that specifies that the A terminal and the C terminal should be conducted for all of the switch elements 115 _{L to} 115 _SR. A signal selection command ODS is sent. As a result, the analog signals PCS _{L to} PCS _SR from the analog conversion unit 114 are supplied to the volume adjustment unit 116 as the sound output selection signals PBS _{L to} PBS _SR via the output signal selection unit 115. Become.

  In addition, the control unit 262 causes the display unit 150 to display a guidance screen for assisting the user in specifying the audio content to be played back when controlling the operation of the “content playback mode”. When a reproduction command designating audio content is input from the operation input unit 160, the control unit 262 controls the drive unit 120 to control reading of the reproduction content data.

The control unit 262, upon operation control of "content reproduction mode", and controls the sound volume adjustment section 116 adjusts the output volume of the speaker 131 _L to 131 _SR sound output unit 130 _L to 130 DEG _SR. When controlling the output volume, the control unit 262 generates volume adjustment commands VLC _{L to} VLC _SR based on the volume designation input to the operation input unit 160 and sends it to the volume adjustment unit 116.

[Operation]
Next, the operation of the speech processing apparatus 100 configured as described above will be described mainly focusing on the operation in the “optimum condition determination mode”.

  When the user uses the operation input unit 160 to input a command to determine the optimum condition from the received voice reproduction condition candidates, the operation of the “optimum condition determination mode” of the sound processing apparatus 100 is performed. Start. Thus, when the operation in the “optimum condition determination mode” starts, the “optimum condition determination mode” is set in step S11 of FIG.

  In step S <b> 11, the control unit 262 sends a command RSC indicating that the test voice signal SGD from the test signal generation unit 220 should be selected to the signal switching unit 230 in the call voice processing unit 113. In accordance with this command RSC, the test voice signal SGD is selected by the signal switching unit 230 and is sent to the analog conversion unit 114 as the signal RSD.

  In addition, the control unit 262 sends a command ECC indicating that the transmission signal TRD from the subtractor 243 is not sent to the adaptive filter 242 toward the switch 241 in the echo cancellation unit 240 in the call voice processing unit 113. The switch 241 is turned off by this command ECC. As a result, the echo cancellation processing in the echo cancellation unit 240 is not performed. When these settings are completed, the process proceeds to step S12.

In step S12, the echo amount value EVD of the test voice at the time of default setting is detected. Here, in this embodiment, the default setting is that all the speakers 131 _L to 131 _SR are selected speakers that output the test sound, and the volume level is set to 6.

In step S12, the control unit 262 first performs the default setting described above. At the time of this default setting, the control unit 262 sends an output signal selection command ODS to the output signal selection unit 115 indicating that the B terminal and the C terminal should be conducted for all the switch elements 115 _{L to} 115 _SR . Next, the control unit 262 sends volume adjustment commands VLC _{L to} VLC _SR indicating that the volume to be output from the speakers 131 _{L to} 131 _SR should be adjusted to level 6 toward the volume adjustment unit 116. After this setting, the control unit 262 sends a test signal generation command SGC to the test signal generation unit 220 to generate the test audio signal SGD.

The test signal generator 220 that has received the test signal generation command SGC generates a test audio signal SGD. The test audio signal SGD generated in this way is sent to the signal switching unit 230. As a result, the test sound is output from the sound output units 130 _{L to} 130 _SR via the signal switching unit 230, the analog conversion unit 114, and the output signal selection unit 115 and the volume adjustment unit 116.

  The test sound is collected by the sound collection unit 140 and sent to the subtracter 243 as sound collection result data AAD (see FIG. 6). As described above, since the switch 241 is off in the “optimum condition determination mode”, the transmission signal TRD transmitted from the subtractor 243 to the echo detector 250 is subjected to echo cancellation processing. Absent. The echo detection unit 250 receives the transmission signal TRD sent from the subtractor 243 and detects the echo amount. The detection result is sent to the optimum condition determination unit 261 as an echo amount value EVD. Then, the optimum condition determining unit 261 stores the echo amount value EVD as an echo amount (A) in the internal storage unit.

Next, in step S13, an optimum condition determination process for reproducing the received sound is performed. In this process, as shown in FIG. 10, first, in step S21, the control unit 262 acquires the reception audio reproduction condition from the reception audio reproduction condition information 171 and sets a preset (P = 1). The setting of the selected speaker corresponding to the preset is performed by the output signal selection command ODS toward the output signal selection unit 115, and the volume adjustment command VLC toward the volume adjustment unit 116 is set regarding the volume setting of the selected speaker. _{L to} VLC _SR . When this setting is completed, the process proceeds to step S22.

In step S22, the echo amount value EVD of the test sound in the preset is detected. In this step, the control unit 262 sends a test signal generation command SGC indicating that the test audio signal SGD should be generated to the test signal generation unit 220. As a result, a test audio signal SGD is generated from the test signal generation unit 220, and the test audio signal SGD is transmitted through the signal switching unit 230, the analog conversion unit 114, the output signal selection unit 115, and the volume adjustment unit 116. Output from the output units 130 _{L to} 130 _SR as test audio. After that, as in step S12, the test sound is collected by the sound collection unit 140 and sent to the subtractor 243 as sound collection result data AAD. Then, from the subtractor 243, a transmission signal TRD that has not been subjected to echo cancellation processing is sent to the echo detector 250. The echo detector 250 receives the transmission signal TRD sent from the subtractor 243 and detects the echo amount. The detection result is sent to the optimum condition determination unit 261 as an echo amount value EVD. Then, the optimum condition determination unit 261 stores the echo amount value EVD as an echo amount (B) in the internal storage unit. Thereafter, the process proceeds to step S23.

  In step S23, the optimum condition determination unit 261 compares the numerical values of the echo amount (A) and the echo amount (B), and determines whether the echo amount (A) is larger than the echo amount (B). judge. If the result of this determination is affirmative (step S23: Y), the process proceeds to step S24.

  In step S24, the optimum condition determination unit 261 replaces the echo amount (B) with the echo amount (A), and sets the value of the preset P at this time to the value PBD. When these settings are completed, the process proceeds to step S25.

  On the other hand, when the result of the determination in step S23 is negative (step S23: N), the process proceeds to step S25.

  In step S25, the control unit 262 determines whether or not the test sound volume detection for all presets has been completed. If the result of this determination is negative (step S25: N), the process proceeds to step S26.

  In step S26, the sound processing apparatus 100 is set for the next preset to be measured. In this setting, as in step S21, the control unit 262 performs setting for the preset to be measured based on the reception sound reproduction condition from the reception sound reproduction condition information 171.

  When the process of step S26 ends, the process returns to step S22. Thereafter, the processes in steps S22 to S26 are repeated until the result of the determination in step S25 becomes affirmative.

  When the measurement processing corresponding to all the presets is completed and the determination result in step S25 becomes affirmative (step S25: Y), the optimum condition determination unit 261 sends the value PBD that is a preset of the optimum conditions to the control unit 262. Report. When the control unit 262 stores the value PBD in the storage unit, the operation of the “optimum condition determination mode” ends.

  When the operation of the “optimum condition determination mode” ends, the sound processing apparatus 100 enters the “content reproduction mode”. As described above, the sound processing apparatus 100 normally operates in the “content reproduction mode”, but the control unit 262 performs a call transmission instruction from the operation input unit 160 or an incoming instruction from the reception unit 211. When the REI is received, the “normal call mode” is set.

  When the voice processing apparatus 100 is in the “normal call mode”, the control unit 262 first refers to the value PBD that is a preset of the optimum condition received from the optimum condition determination unit 261 and determines the optimum condition from the received voice reproduction condition information 171. The received audio playback condition is acquired. Next, an output signal selection instruction ODS is sent to the output signal selection unit 115 indicating that a switch operation that can output the signal RSS from the selection speaker under the optimum condition is to be performed.

Further, the control unit 262 sends an instruction to the signal switching unit 230 to select the reception signal RED from the reception unit 211, and sends the transmission signal TRD from the subtractor 243 to the adaptive filter to the switch 241. An instruction to send to 242 is sent. Depending on the setting of the switch 241, the echo cancellation unit 240 performs echo cancellation processing. Furthermore, the control unit 262 sends to the volume adjustment unit 116 volume adjustment commands VLC _{L to} VLC _SR indicating that the volume to be output from the selected speaker should be adjusted to the optimum condition level.

  When receiving a call disconnect command from the operation input unit 160 in the “normal call mode” and when the incoming call instruction REI from the receiving unit 211 is interrupted, the audio processing device 100 is in the “content playback mode”. Resume operation.

  The control unit 262 causes the display unit 150 to display a guidance screen for assisting the user in specifying the audio content to be reproduced in the “content reproduction mode”. When a reproduction command designating audio content is input to the operation input unit 160, the control unit 262 controls the drive unit 120 to control data reading of the audio content.

In the “content reproduction mode”, the control unit 262 controls the audio processing unit 112 to separate the content data CTD from the drive unit 120 into four channel processing signals PCD _{L to} PCD _SR .

The control unit 262 is sometimes "content reproduction mode", and controls the sound volume adjustment section 116 adjusts the output volume of the color of the speaker 131 _L to 131 _SR sound output unit 130 _L to 130 DEG _SR.

As described above, in the present embodiment, the four speakers 131 _{L to} 131 _SR are used to reproduce the received voice when performing a hands-free call in the vehicle. From these speakers, the user sets a plurality of reception sound reproduction condition candidates consisting of a combination of a selected speaker selected for reproduction output of the received sound and a volume output from the selected speaker. Then, a test sound is sequentially generated under each received sound reproduction condition, and an echo sound component under the condition is measured. Then, based on the measurement result, the optimum condition for minimizing the wraparound echo from the speaker of the received voice to the output microphone is automatically determined. Thereby, in the case of providing a plurality of speakers, it is possible to reduce the sneak echo from the speaker of the received voice to the output microphone.

  Therefore, according to the present embodiment, when a hands-free call is made during driving of the vehicle, a comfortable communication call can be made between the callers.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and various modifications are possible.

  For example, in the above embodiment, communication between the voice processing device 100 and the mobile phone device 900 is realized by wireless communication. For example, a cable is connected between the voice processing device 100 and the mobile phone device 900. The communication between the audio processing device 100 and the mobile phone device 900 may be wired communication.

  In the above embodiment, the voice processing device 100 performs wireless communication with the mobile phone device 900. However, the voice processing device 100 is not limited to the mobile phone device, and performs wireless communication with mobile communication terminal devices such as PHS, PDA, and automobile phone. You may do it.

  In the above embodiment, the four speakers are provided as the speakers for reproducing the received sound. However, the received sound is reproduced and output from two, three, or five or more speakers. You can also.

  In the above embodiment, the present invention is applied to a sound processing device mounted on a vehicle. However, the present invention can also be applied to a sound processing device mounted on a moving body other than the vehicle. Also, for example, the present invention can be applied to a sound processing device used in a home or the like.

  In addition, a part or all of the control unit 110 in the above-described embodiment includes a central processing unit (CPU), a DSP (Digital Signal Processor), a read only memory (ROM), a random access memory (RAM). : Random Access Memory) or the like, and configured as a computer, and a part of or all of the processing in the above embodiment is executed by executing a program prepared in advance on the computer. Good. This program is recorded on a computer-readable recording medium such as a hard disk, CD-ROM, or DVD, and is read from the recording medium and executed by the computer. The program may be acquired in a form recorded on a portable recording medium such as a CD-ROM or DVD, or may be acquired in a form of delivery via a network such as the Internet. Also good.

1 is a block diagram schematically showing the configuration of a speech processing apparatus according to an embodiment of the present invention. It is a figure for demonstrating the arrangement position of four speakers of FIG. 1, and a microphone. It is a block diagram for demonstrating the reproduction | regeneration audio | voice condition information 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 telephone call speech process part of FIG. It is a block diagram for demonstrating the structure of the echo cancellation part of FIG. FIG. 5 is a block diagram for explaining a configuration of an output signal selection unit in FIG. 4. It is a block diagram for demonstrating the structure of the control process part of FIG. 6 is a flowchart for explaining optimum condition determination processing for received voice by the apparatus of FIG. 1. 10 is a flowchart for explaining an optimum condition determination process in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Voice processing apparatus 130 ... Storage | storage device (storage means)
131 _L to 131 _SR ... speaker 140 ... sound collecting unit (sound collecting means)
240 ... Echo canceling part (echo canceling means)
242 ... Adaptive filter (filter means)
243 ... Subtractor (subtraction means)
250 ... Echo detection unit (echo detection means)
261 ... Optimal condition determination unit (optimum condition determination means)
262... Control unit (test sound output control means, condition setting means, echo
Canceling control means)

Claims (8)

A voice processing device having a call communication function,
A sound collecting means for collecting a voice emitted for a call with the outside and converting it into a transmission voice signal;
A plurality of speakers that reproduce and output received audio based on externally received audio signals;
A plurality of reception sound reproduction condition candidates comprising a combination of at least one selected speaker selected for reproduction output from the plurality of speakers and the volume of the sound output from the selected speaker when the reception sound is reproduced. Storage means in which is stored;
Test audio output control means for sequentially reproducing and outputting internally generated test audio from the selected speaker in accordance with each of the plurality of received audio playback condition candidates;
Echo detecting means for detecting an echo amount of the sound collected by the sound collecting means due to the reproduction output of the test sound;
An optimum condition determining means for determining an optimum condition from the plurality of received voice reproduction condition candidates based on a detection result by the echo detection means corresponding to each of the plurality of received voice reproduction condition candidates;
A condition setting means for setting the optimum condition as a reception voice reproduction condition during call communication;
An audio processing apparatus comprising:   The speech processing apparatus according to claim 1, further comprising echo canceling means for reducing echo components in the transmission voice signal during the call communication. The echo canceling means is
Filter means for generating a pseudo echo signal that simulates the echo component based on the received audio signal;
Subtracting means for generating the transmission voice signal by subtracting the pseudo echo signal from the sound collection result in the sound collecting means;
The speech processing apparatus according to claim 2, further comprising:   The audio processing apparatus according to claim 2, further comprising an echo cancellation control unit configured to perform setting so as not to reduce the echo component by the echo cancellation unit when the test audio is reproduced and output.   The sound processing apparatus according to claim 1, wherein the sound processing apparatus is mounted on a moving body. Sound collecting means for collecting sound that is emitted for a call with the outside and converting it into a transmission sound signal; a plurality of speakers that reproduce and output received sound based on a received sound signal from the outside; and the received sound Are stored, a plurality of reception sound reproduction condition candidates that are combinations of at least one selected speaker selected for reproduction output from the plurality of speakers and the volume of the sound output from the selected speaker are stored. A voice processing method used in a voice processing apparatus comprising a storage means,
A test sound output step of sequentially reproducing and outputting internally generated test sound from the selected speaker according to each of the plurality of received sound reproduction condition candidates;
An echo detection step of detecting an echo amount of the sound collected by the sound collecting means due to the reproduction output of the test sound;
An optimum condition determining step for determining an optimum condition from the plurality of received voice reproduction condition candidates based on the detection result in the echo detection step corresponding to each of the plurality of received voice reproduction condition candidates;
A condition setting step of setting the optimum condition as a reception voice reproduction condition during call communication;
An audio processing method comprising:   An audio processing program for causing an arithmetic means to execute the audio processing method according to claim 6.   8. A recording medium on which the audio processing program according to claim 7 is recorded so as to be readable by an arithmetic means.

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