JPWO2010109614A1 - Audio signal processing apparatus and audio signal processing method - Google Patents

Abstract

When the call communication operation of the call communication unit 120 is started, the control unit 195A instructs the output selection unit 211 to supply the call reception voice signal ARS from the call communication unit 120 to the adder 213. In addition to the SNC, the addition unit 213 sets the output of the addition result by the addition control command ADC. As a result of such setting, the sound corresponding to the content audio signal ACS from the content sound source unit 110 is reproduced and output from the speaker unit 130 for everyone, and the signal obtained by reversing the phase of the content audio signal ACS by the inversion unit 212 Then, an ultrasonic wave based on the addition result with the call reception audio signal ARS via the output selection unit 211 is output from the parametric speaker unit 140 toward the caller. As a result, a sound appropriate for each user staying in the sound field space is provided.

Description

  The present invention relates to an audio signal processing device and an audio signal processing method.

  Conventionally, acoustic devices that reproduce audio content and output reproduced audio from a speaker are mounted on many moving objects such as vehicles. Thereby, it is possible to enjoy the content reproduction sound even in the mobile body space.

  Further, call communication using a mobile communication terminal device such as a mobile phone has become indispensable for daily life. For this reason, attention is paid to so-called hands-free calling, in which call communication by a mobile communication terminal device can be performed without hindering driving operation even during driving of a vehicle.

  The audio content reproduction and the hands-free call described above perform audio output to the mobile body space independently of each other. For this reason, a technique for rationally adjusting the output of content playback audio and the output of received audio in a hands-free call has been proposed. As one of such technologies, a technology for muting content playback audio during call communication has been proposed (see Patent Document 1: hereinafter referred to as “Conventional Example 1”). As another technique, a technique is known in which, during a call communication, the output volume of the content playback voice and the reception voice in a hands-free call is adjusted and then synthesized and played back (Patent Document). Reference 2: hereinafter referred to as “conventional example 2”).

  Furthermore, although it is not a technology related to the simultaneous operation of audio content playback and hands-free calling, a technology has been proposed for transmitting sound from a parametric speaker to a specific object while transmitting sound from an omnidirectional speaker to an unspecified object. (Refer to Patent Document 3: hereinafter referred to as “Conventional Example 3”).

Japanese Patent Laid-Open No. 10-320892 JP 2003-258988 A WO2005 / 076661

  In the technique of Conventional Example 1 described above, the content reproduction sound is muted during call communication. For this reason, there is no inconvenience in the calling environment for the caller who is on the moving body, but when the passenger is on the moving body, the content reproduction sound is interrupted for the passenger. As a result, the passengers feel uncomfortable and uncomfortable, and it is difficult to provide a good listening environment for audio contents.

  Further, in the technique of Conventional Example 2 described above, a synthesized voice of the content playback voice and the received voice in the hands-free call is reproduced and output during the call communication. For this reason, for the caller who is on the moving body, the content reproduction sound becomes noise sound for the received sound, and for the mobile passenger, the reception sound can become noise sound for the content reproduction sound. Also, in the case of a received voice that the caller does not want to be known to others, it will be known to the passenger. As a result, it has been difficult for a caller to provide a favorable call environment, and it has been difficult for a passenger to provide a sound environment for listening to audio content.

  Even if the technology of Conventional Example 3 is applied to the simultaneous operation of audio content reproduction and hands-free calling, the voice transmitted from the omnidirectional speaker is also transmitted to the caller who is the target of the voice of the parametric speaker. The sound can be heard in the same volume as during periods other than during a call. As a result, it is difficult for the caller to provide a good call environment for the caller because the content playback sound becomes a noise sound for the received sound.

  For this reason, a technology capable of providing a favorable call environment for a caller who is on a moving body and providing a good audio content listening environment for a passenger during simultaneous operation of audio content playback and hands-free calling. Is long-awaited. 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 provides an audio signal processing device and an audio signal processing method capable of providing appropriate audio for each of the users staying in a predetermined sound field space. The purpose is to do.

  From a first viewpoint, the present invention provides a first speaker intended for a plurality of listeners; a second speaker having a strong directivity intended for a specific listener among the plurality of listeners; A first signal source that outputs an audio signal to the first speaker; a signal obtained by inverting the phase of the audio signal from the first signal source, and an audio signal from the first signal source; An audio signal processing apparatus comprising: a first addition unit that adds an audio signal from a second signal source having a different content and outputs the result to the second speaker.

  From a second viewpoint, the present invention provides a first speaker for a plurality of listeners; a second speaker having a strong directivity for a specific listener among the plurality of listeners; An audio signal processing method used in an audio signal processing apparatus comprising: a first signal source that outputs an audio signal toward the first speaker, wherein the audio signal from the first signal source is A phase inversion step of phase inversion; adding the phase-inverted signal and an audio signal from a second signal source whose contents are different from the audio signal from the first signal source; An audio signal processing method, comprising:

1 is a block diagram schematically showing the configuration of an audio signal processing device according to a first embodiment of the present invention. It is a block diagram which shows the structure of the speaker output audio | voice processing part of FIG. It is a block diagram which shows the structure of the ultrasonic signal generation part of FIG. It is a block diagram which shows the structure of the call transmission audio | voice processing part of FIG. It is a block diagram which shows roughly the structure of the audio | voice signal processing apparatus which concerns on 2nd Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings by illustrating an audio signal processing device mounted on a vehicle. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS.

<Configuration>
FIG. 1 schematically shows the configuration of an audio signal processing device 100A according to the first embodiment of the present invention. As shown in FIG. 1, the audio signal processing apparatus 100A includes a content sound source unit 110 as a first signal source and a call communication unit 120 as a call communication means as a second signal source. . The audio signal processing apparatus 100A includes a speaker unit 130 as a first speaker and a parametric speaker unit 140 as a second speaker.

  Furthermore, the audio signal processing device 100A includes a sound collection unit 150 and an operation input unit 170. The audio signal processing apparatus 100A includes a processing unit 190A.

  The content sound source unit 110 generates the content audio signal ACS based on the audio content. For example, when the audio signal processing apparatus 100A is an apparatus that reproduces audio content recorded on a recording medium such as a compact disc (CD), the content sound source unit 110 reads the audio content from the recording medium. And extraction means for extracting the content audio signal ACS from the reading result by the reading means. If the audio signal processing apparatus 100A is an apparatus that reproduces audio content acquired by receiving broadcast waves, the content sound source unit 110 includes content extraction means for extracting audio content from the broadcast wave reception results; Audio signal extraction means for extracting the content audio signal ACS from the extraction result by the content extraction means.

  The content sound source unit 110 includes a volume adjustment unit 115 as volume adjustment means. The volume adjustment unit 115 adjusts the signal level of the content audio signal ACS based on the volume adjustment command AVC from the processing unit 190A. The content audio signal ACS whose signal level is adjusted by the volume adjusting unit 115 is sent to the processing unit 190A.

  The call communication unit 120 communicates with a call device as a call destination via a communication network. In the first embodiment, the call communication unit 120 is configured as a mobile phone module that performs call communication using a mobile phone network.

  The call communication unit 120 starts or ends the call processing operation in accordance with the call control command CMC from the processing unit 190A. Specifically, for example, when the call communication unit 120 receives a call command specifying a telephone number as the call control command CMC, the call communication unit 120 starts a call process. When the call communication unit 120 receives an off-hook command accompanying an incoming call as the call control command CMC, the call communication unit 120 performs an off-hook process. Further, when receiving the communication disconnection command as the call control command CMC, the call communication unit 120 performs an on-hook process and ends the call processing operation.

  Further, the call communication unit 120 reports the call processing operation state to the processing unit 190A as an operation report OMD. Specifically, for example, when a ring tone is detected, the call communication unit 120 reports that the incoming call is received to the processing unit 190A as an operation report OMD. When the on-hook processing is performed, the call communication unit 120 reports to the processing unit 190A as an operation report OMD that communication has been disconnected. By such an operation report OMD, the processing unit 190A can know the operation state of the call communication unit 120.

  The call communication unit 120 sends the received voice during the call operation to the processing unit 190A as a call received voice signal ARS. In addition, when the call communication unit 120 receives the call transmission voice signal ATS from the processing unit 190A during the call operation, the call communication unit 120 sends it to the communication network as transmission voice.

  The speaker unit 130 includes a wide angle speaker. The speaker unit 130 reproduces and outputs sound for all persons in the vehicle interior based on the audio signal AOF from the processing unit 190A.

  The parametric speaker unit 140 includes an ultrasonic transducer array. The parametric speaker unit 140 reproduces and outputs sound for a driver sitting in a driver's seat in the passenger compartment based on the ultrasonic signal AOS from the processing unit 190A.

  In the first embodiment, the sound collection unit 150 includes a microphone disposed in front of the driver's seat in the passenger compartment. The sound collection result by the microphone is sent to the processing unit 190A as a sound collection audio signal AAS.

  The operation input unit 170 includes a key unit provided in the main body of the audio signal processing device 100A and / or a remote input device including the key unit. Here, as a key part provided in the main body part, a touch panel provided in a display device can be used.

  The operation content of the audio signal processing device 100A is set by operating the operation input unit 170. The content input to the operation input unit 170 is sent from the operation input unit 170 to the processing unit 190A as operation input data IPD.

  Next, the processing unit 190A will be described. The processing unit 190A includes a speaker output voice processing unit 191, a call transmission voice processing unit 192, and a control unit 195A as a detection unit.

  The speaker output sound processing unit 191 generates the sound signal AOF supplied to the speaker unit 130 and the ultrasonic signal AOS supplied to the parametric speaker unit 140. As shown in FIG. 2, the speaker output sound processing unit 191 having such a function includes an output selection unit 211 as a selection unit, an inversion unit 212 as a part of the first addition unit, and a first addition unit. And an addition unit 213 as a limiting unit and an ultrasonic signal generation unit 214. In addition, the speaker output sound processing unit 191 includes an addition unit 216 as a second addition unit and a power amplification unit 217.

  The output selection unit 211 receives the call reception voice signal ARS from the call communication unit 120. Then, the output selection unit 211 selects either the first output signal supplied to the adder 213 or the second output signal supplied to the adder 216 according to the output designation SNC from the controller 195A. Selectively output. The output selection unit 211 outputs a “0” level signal for an output signal for which the call reception voice signal ARS is not output by the output designation SNC.

  The inversion unit 212 receives the content audio signal ACS from the content sound source unit 110. Then, the inverting unit 212 performs phase inversion of the content audio signal ACS. The signal whose phase is inverted by the inverting unit 212 is sent to the adding unit 213.

  The adder 213 receives the first output signal from the output selector 211 and the signal from the inverter 212. When the addition is specified by the addition control command ADC from the control unit 195A, the addition unit 213 adds both received signals and sends the addition result to the ultrasonic signal generation unit 214 as a signal ABS. . On the other hand, when the mute designation is made by the addition control command ADC from the control unit 195A, the adding unit 213 sends a “0” level signal to the ultrasonic signal generating unit 214 as the signal ABS.

  The ultrasonic signal generator 214 receives the signal ABS from the adder 213. Then, the ultrasonic signal generator 214 generates an ultrasonic signal AOS corresponding to the signal ABS. As shown in FIG. 3, the ultrasonic signal generation unit 214 having such a function includes a high frequency generation unit 221, an amplitude modulation unit 222, and a power amplification unit 223.

  The high frequency generator 221 generates an ultrasonic carrier signal that is a sine wave signal having a predetermined ultrasonic frequency, and sends the ultrasonic carrier signal to the amplitude modulator 222. The predetermined ultrasonic frequency corresponds to the signal ABS from the adder 213 at the position of the driver's ear based on the distance from the parametric speaker unit 140 to the position of the driver's ear seated in the driver's seat. It is predetermined so that the sound is reproduced.

  The amplitude modulator 222 receives the signal ABS from the adder 213 and the ultrasonic carrier signal from the high frequency generator 221. The amplitude modulation unit 222 modulates the amplitude of the ultrasonic carrier signal with the signal ABS. Then, the modulation result is sent to the power amplifier 223.

  The power amplifying unit 223 includes a power amplifier. The power amplifier 223 receives the modulation signal from the amplitude modulator 222. Then, the power amplifier 223 amplifies the modulated signal and generates an ultrasonic signal AOS for driving the ultrasonic transducer in the parametric speaker unit 140. The ultrasonic signal AOS thus generated is sent to the parametric speaker unit 140.

  When the signal ABS from the adder 213 is a “0” level signal, the modulation signal generated by the amplitude modulator 222 is a “0” level signal. As a result, the ultrasonic signal AOS also becomes a “0” level signal, and the ultrasonic output from the parametric speaker unit 140 is not performed.

  Returning to FIG. 2, the adder 216 receives the second output signal from the output selector 211 and the content audio signal ACS from the content sound source unit 110. Then, the adder 216 adds both received signals. The addition result by the adder 216 is sent to the power amplifier 217 and also sent to the call transmission voice processor 192 as a signal APF.

  The power amplifying unit 217 includes a power amplifier. The power amplifier 217 receives the addition result signal from the adder 216. Then, the power amplifier 217 amplifies the received addition result signal and generates an audio signal AOF for driving the wide-angle speaker in the speaker unit 130. The audio signal AOF thus generated is sent to the speaker unit 130.

  Returning to FIG. 1, the call transmission voice processing unit 192 generates a call transmission voice signal ATS to be supplied to the call communication unit 120. As shown in FIG. 4, the call transmission voice processing unit 192 having such a function includes an inversion unit 231, an attenuation unit 232, and an addition unit 233.

  The inversion unit 231 receives the signal APF from the speaker output sound processing unit 191. Then, the inversion unit 231 performs phase inversion of the signal APF. The signal whose phase is inverted by the inversion unit 231 is sent to the attenuation unit 232.

  The attenuating unit 232 receives a signal from the inverting unit 231. Then, the attenuation unit 232 attenuates the received signal according to the attenuation rate designated by the attenuation rate designation CNC from the control unit 195A. The attenuation signal generated by the attenuation unit 232 is sent to the addition unit 233.

  Note that the attenuation rate designated by the control unit 195A with the attenuation rate designation CNC is volume adjustment from the viewpoint of removing the sound component reproduced and output by the speaker unit 130 from the collected sound signal AAS output by the sound collecting unit 150. It is determined in advance by preliminary measurement, simulation, or the like corresponding to the setting state of the unit 115.

  The adder 233 receives the collected sound signal AAS from the sound collection unit 150 and the attenuation signal from the attenuation unit 232. Then, the adding unit 233 adds both received signals. The addition result by the adder 233 is sent to the call communication unit 120 as a call transmission audio signal ATS.

  Returning to FIG. 1, the control unit 195A controls the operation of the audio signal processing apparatus 100A. Such control by the control unit 195A is performed by issuing a volume adjustment command AVC to the content sound source unit 110, issuing a call control command CMC to the call communication unit 120, issuing an output designation SNC and an addition control command ADC to the speaker output sound processing unit 191, In addition, this is performed by issuing an attenuation rate designation CNC to the communication transmission voice processing unit 192.

  It should be noted that the attenuation rate designation CNC, volume adjustment command AVC, call control command CMC, output designation SNC, and addition control command ADC are issued at the time of initial setting by the control unit 195A and operation input data IPD from the operation input unit 170. Based on the operation report OMD from the call communication unit 120, it is appropriately performed by the control unit 195A. Details of the control operation by the control unit 195A will be described later.

<Operation>
Next, the operation of the audio signal processing apparatus 100A configured as described above will be described.

<Operation at normal operation setting>
When the power of the audio signal processing apparatus 100A is turned on, the control unit 195A performs normal operation setting. At the time of this normal operation setting, the control unit 195A sends a volume adjustment command AVC designating mute release to the volume adjustment unit 115 of the content sound source unit 110 (see FIG. 1).

  Further, the control unit 195A sends an output designation SNC to the effect that the call reception voice signal ARS from the call communication unit 120 should be supplied to the addition unit 213 to the output selection unit 211 of the speaker output voice processing unit 191 (see FIG. 2). ). As a result, the “0” level signal is supplied from the output selection unit 211 to the addition unit 216.

  Further, the control unit 195A sends the addition control command ADC for which mute is designated to the addition unit 213 of the speaker output sound processing unit 191 (see FIGS. 1 and 2). As a result, the ultrasonic output from the parametric speaker unit 140 is not performed.

  When the content sound signal ACS is output from the content sound source unit 110 in such a state where the normal operation setting is maintained, the addition result by the adder 216 becomes the content sound signal ACS itself. The addition result signal by the adder 216 is amplified by the power amplifier 217 and supplied to the speaker unit 130 as an audio signal AOF (see FIG. 2). As a result, audio corresponding to the content audio signal ACS is reproduced and output from the speaker unit 130.

《Operation during single call in call communication》
When receiving a call request specifying the telephone number of the device to be called from the operation input unit 170, the control unit 195A sends a call command specifying the telephone number to the call communication unit 120 as a call control command CMC. . Then, by detecting the operation report OMD indicating that the calling process is started, the control unit 195A detects that the call communication unit 120 is in a call processing operation. Further, by detecting the operation report OMD indicating that the call has been received, the control unit 195A detects that the call communication unit 120 is in a call processing operation (see FIG. 1).

  When it is detected at the time of normal operation setting that the call communication unit 120 is in a call processing operation in this way, the control unit 195A sends an addition control command ADC for which addition is specified to the addition unit 213. As a result, the addition result of the signal obtained by inverting the phase of the content audio signal ACS by the inversion unit 212 and the call reception audio signal ARS via the output selection unit 211 is converted from the addition unit 213 to the ultrasonic signal generation unit. 214 (see FIG. 2).

  Upon receiving the signal ABS, the ultrasonic signal generator 214 generates an ultrasonic signal AOS based on the signal ABS and sends it to the parametric speaker unit 140 (see FIG. 2). And the parametric speaker unit 140 outputs an ultrasonic wave toward the driver who is a single caller based on the ultrasonic signal AOS.

  As a result, the reproduced sound from the speaker unit 130 and the reproduced sound from the parametric speaker unit 140 reach the caller's ear. Here, since the sound reproduced by the parametric speaker unit 140 includes a sound component obtained by inverting the phase of the sound reproduced by the speaker unit 130, the content sound based on the content sound signal ACS is reproduced and output from the speaker unit 130. Even in this case, the content sound is effectively canceled by the sound component at the driver's ear. As a result, the call reception voice based on the call reception voice signal ARS is heard by the driver in a clear manner.

  For passengers other than the driver, only a sound reproduced by the speaker unit 130 is audible. As a result, when the content audio based on the content audio signal ACS is reproduced and output from the speaker unit 130, the passengers other than the driver can continuously listen to the content audio without being disturbed by the call reception audio. can do.

  On the other hand, when the driver utters during the call processing operation of the call communication unit 120, the generated sound is collected by the sound collection unit 150 together with the reproduced sound from the speaker unit 130. Then, the sound collection result by the sound collection unit 150 is sent to the processing unit 190A as a sound collection sound signal AAS (see FIG. 1).

  Subsequently, the collected sound signal AAS is attenuated by the attenuation unit 232 after the phase of the signal APF from the speaker output sound processing unit 191 is inverted by the inversion unit 231 by the addition unit 233 in the call transmission audio processing unit 192. The signal is added (see FIG. 4). As a result, the addition result by the addition unit 233 is obtained by effectively removing the component of the reproduced sound by the speaker unit 130 from the collected sound signal AAS. That is, in the addition result by the addition unit 233, the sound generated by the driver is the main audio component.

  The addition result obtained by the adding unit 233 thus obtained is sent to the call communication processing unit 120 as a call transmission audio signal ATS (see FIG. 4). As a result, the sound generated by the driver is transmitted in a clear manner to the apparatus that is the call destination.

  When the driver makes a communication disconnection request using the operation input unit 170 during such a single communication operation in the call communication, the control unit 195A sends the communication disconnection command to the call communication unit 120 as the call control command CMC. send. Subsequently, the control unit 195A performs the normal operation setting described above. As a result, all the passengers can listen to the sound reproduced by the speaker unit 130. For this reason, when the content audio based on the content audio signal ACS is reproduced and output from the speaker unit 130, all the passengers return to a state in which the content audio can be heard.

《Operation at the time of multiple calls in call communication》
When the driver uses the operation input unit 170 to specify a plurality of calls during the single call operation, the control unit 195A specifies the mute setting to the volume adjustment unit 115 of the content sound source unit 110. A volume adjustment command AVC is sent (see FIGS. 1 and 2). As a result, the content audio signal ACS becomes a “0” level signal.

  Further, the control unit 195A sends an output designation SNC indicating that the call reception voice signal ARS from the call communication unit 120 should be supplied to the addition unit 216 to the output selection unit 211 of the speaker output voice processing unit 191 (see FIG. 2). ). As a result, the “0” level signal is supplied from the output selection unit 211 to the addition unit 213.

  Further, the control unit 195A sends the addition control command ADC for which mute is designated to the addition unit 213 of the speaker output sound processing unit 191 (see FIG. 1). As a result, the ultrasonic output from the parametric speaker unit 140 is not performed.

  When the above-described multiple caller settings are performed, the addition result by the adder 216 becomes the call reception voice signal ARS itself. The addition result signal by the adder 216 is amplified by the power amplifier 217 and supplied to the speaker unit 130 as an audio signal AOF (see FIG. 2). As a result, the sound corresponding to the call reception audio signal ARS is reproduced and output from the speaker unit 130, and all the passengers can hear the utterance sound of the other party.

  When the driver makes a communication disconnection request using the operation input unit 170 during the multiple communication operations in such communication, the control unit 195A displays the communication disconnection command as in the case of the single call operation described above. Is sent to the call communication unit 120 as a call control command CMC, and normal operation setting is performed.

  In addition, when the driver designates a single call using the operation input unit 170 during a plurality of call operations, the control unit 195A is the same as that at the time of switching from the normal operation to the single call operation described above. Set up.

  Note that the generation of the call transmission audio signal ATS is performed in the same manner as in the case of the single call operation described above.

  As described above, according to the first embodiment, in a state where the call communication unit 120 is not performing the call communication operation, the sound based on the content audio signal ACS from the content sound source unit 110 is transmitted to the passenger in the vehicle interior. Normal setting for reproduction output from the speaker unit 130 is performed for all persons. When the call communication operation of the call communication unit 120 is started in such a normal setting, the addition of the signal obtained by inverting the phase of the content audio signal ACS and the call reception audio signal ARS from the call communication unit 120. A single caller setting is performed in which an ultrasonic wave based on the result is output from the parametric speaker unit 140.

  As a result, the playback sound from the speaker unit 130 and the playback sound from the parametric speaker unit 140 reach the ears of the driver (single caller) sitting in the driver's seat. Even when the content audio based on the content audio signal ACS is reproduced and output, the content audio is effectively canceled by the audio component at the driver's ear. Therefore, the call reception voice based on the call reception voice signal ARS is heard by the driver in a clear manner. On the other hand, for passengers other than the driver, in a case where only the reproduction sound by the speaker unit 130 is maintained and the content sound based on the content sound signal ACS is reproduced and output from the speaker unit 130, Passengers other than the driver can continue to listen to the content audio without being disturbed by the call reception audio.

  Therefore, according to the first embodiment, it is possible to provide sound appropriate for each person staying in the vehicle compartment.

  Further, in the first embodiment, if the provision of the call reception voice to all the passengers is specified during the call communication of the call communication unit 120, the ultrasonic output from the parametric speaker unit 140 is stopped, and the content sound source The content audio signal ACS from the unit 110 is set to a “0” level signal, and a multi-party setting is performed in which audio based on the call reception audio signal ARS is reproduced and output from the speaker unit 130. As a result, the voice based on the call reception voice signal ARS is provided to all the passengers in a clear manner. Therefore, the call reception voice can be provided only to the driver or to all the passengers according to the driver's selection.

  In the first embodiment, since the ultrasonic output from the parametric speaker unit 140 is stopped at the time of normal setting and setting of a plurality of parties, unnecessary power consumption can be prevented.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference mainly to FIG.

<Configuration>
FIG. 5 schematically shows the configuration of an audio signal processing device 100B according to the second embodiment of the present invention. As shown in FIG. 5, the audio signal processing device 100B does not include the call communication unit 120 and the sound collection unit 150 as compared with the audio signal processing device 100A of the first embodiment described above. The difference is that a processing unit 190B is provided instead of the processing unit 190A. Here, the processing unit 190B is different from the processing unit 190A in that it does not include the call transmission voice processing unit 192 and includes a control unit 195B instead of the control unit 195A described above. Then, from the navigation device 900 as navigation means, which is a second signal source installed outside the audio signal processing device 100B, the guide audio signal AGS is replaced by the above-described call reception audio signal ARS in the processing unit 190B. The speaker output sound processing unit 191 is supplied.

  Hereinafter, description will be made mainly focusing on these differences.

  The control unit 195B controls the operation of the audio signal processing device 100B. The control unit 195B detects whether or not the navigation apparatus 900 is generating the guide voice signal AGS by detecting the signal level of the guide voice signal AGS.

  Here, the control unit 195B determines that the guide audio signal AGS is being generated when the signal level of the guide audio signal AGS is equal to or higher than a predetermined value. Further, the control unit 195B determines that the operation of generating the guide voice signal AGS has ended when the state where the signal level of the guide voice signal AGS is less than the predetermined value continues for a predetermined time.

  The predetermined value and the predetermined time are determined in advance based on experiments, simulations, experiences, and the like.

  The control by the control unit 195B is performed by issuing an output designation SNC and an addition control command ADC to the speaker output sound processing unit 191. The issuance of the output designation SNC and the addition control command ADC is appropriately performed by the control unit 195B based on the detection result of whether or not the navigation device 900 is generating the guide voice signal AGS. Details of the control operation by the control unit 195B will be described later.

<Operation>
Next, the operation of the audio signal processing apparatus 100B configured as described above will be described.

<Operation at normal operation setting>
When the power of the audio signal processing device 100B is turned on, the control unit 195B performs normal operation setting. At the time of this normal operation setting, the control unit 195B sends an output designation SNC to the effect that the guide audio signal AGS from the navigation device 900 should be supplied to the adding unit 213 to the output selection unit 211 of the speaker output audio processing unit 191. In addition, the control unit 195B sends the addition control command ADC for which mute is designated to the addition unit 213 of the speaker output sound processing unit 191 (see FIGS. 5 and 2).

  In such a state where the normal operation setting is maintained, as in the case where the normal operation setting is performed in the first embodiment, when the content sound signal ACS is output from the content sound source unit 110, the speaker output sound processing unit The addition result by the adder 216 of 191 is the content audio signal ACS itself. The addition result signal by the adder 216 is amplified by the power amplifier 217 and supplied to the speaker unit 130 as an audio signal AOF (see FIG. 2). As a result, audio corresponding to the content audio signal ACS is reproduced and output from the speaker unit 130.

《Operation when listening to guide sound alone》
When it is detected during normal operation setting that the operation of generating the guide audio signal AGS is detected based on the detection result of the signal level of the guide audio signal AGS, the control unit 195B instructs the addition unit 213 to add. The added control command ADC made is sent. As a result, the addition result of the signal obtained by inverting the phase of the content audio signal ACS by the inversion unit 212 and the guide audio signal AGS via the output selection unit 211 is obtained as the signal ABS from the addition unit 213 to the ultrasonic signal generation unit 214. (See FIG. 5 and FIG. 2).

  Upon receiving the signal ABS, the ultrasonic signal generator 214 generates an ultrasonic signal AOS based on the signal ABS and sends it to the parametric speaker unit 140 (see FIG. 2). And the parametric speaker unit 140 outputs an ultrasonic wave toward the driver who is a single listener of the guide voice based on the ultrasonic signal AOS.

  As a result, the reproduced sound from the speaker unit 130 and the reproduced sound from the parametric speaker unit 140 reach the caller's ear. Here, since the sound reproduced by the parametric speaker unit 140 includes a sound component obtained by inverting the phase of the sound reproduced by the speaker unit 130, the content sound based on the content sound signal ACS is reproduced and output from the speaker unit 130. Even in this case, the content sound is effectively canceled by the sound component at the driver's ear. As a result, the guide voice based on the guide voice signal AGS is heard by the driver in a clear manner.

  Note that, as in the case of the single call operation in the first embodiment, a state in which only the reproduced sound from the speaker unit 130 is audible to a passenger other than the driver is maintained. As a result, when the content audio based on the content audio signal ACS is reproduced and output from the speaker unit 130, the passengers other than the driver can continuously listen to the content audio without being disturbed by the call reception audio. can do.

  When it is detected that the operation of generating the guide audio signal AGS is completed during the operation of listening to the guide audio alone, the control unit 195B performs the normal operation setting described above. As a result, all the passengers can listen to the sound reproduced by the speaker unit 130.

《Operation when listening to multiple guide voices》
When the driver uses the operation input unit 170 to specify multiple listening of guide voices during the operation of listening to multiple guide voices, the control unit 195B causes the volume adjusting unit 115 of the content sound source unit 110 to be used. Sends a volume adjustment command AVC specifying the mute setting (see FIG. 5). As a result, the content audio signal ACS becomes a “0” level signal.

  In addition, the control unit 195B sends an output designation SNC to the effect that the guide audio signal AGS from the navigation device 900 should be supplied to the adding unit 216 to the output selection unit 211 of the speaker output audio processing unit 191 (see FIG. 2). As a result, the “0” level signal is supplied from the output selection unit 211 to the addition unit 213.

  In addition, the control unit 195B sends the addition control command ADC for which mute is designated to the addition unit 213 of the speaker output sound processing unit 191 (see FIGS. 5 and 2). As a result, the ultrasonic output from the parametric speaker unit 140 is not performed.

  When the above multiple listening settings are performed, the addition result by the addition unit 216 becomes the guide audio signal AGS itself. The addition result signal by the adder 216 is amplified by the power amplifier 217 and supplied to the speaker unit 130 as an audio signal AOF (see FIG. 2). As a result, the sound corresponding to the guide sound signal AGS is reproduced and output from the speaker unit 130, and all the passengers can listen to the guide sound.

  If it is detected that the operation of generating the guide audio signal AGS is completed during the operation of listening to a plurality of such guide sounds, the control unit 195B performs the normal operation setting described above. As a result, all the passengers can listen to the sound reproduced by the speaker unit 130.

  In addition, when the driver uses the operation input unit 170 to specify the single listening of the guide voice during the multiple call operation, the control unit 195B is in the case of switching from the normal operation to the single listening operation described above. Set the same as.

  As described above, according to the second embodiment, in a state where the navigation device 900 is not performing the operation of generating the guide sound, the sound based on the content sound signal ACS from the content sound source unit 110 is boarded in the vehicle interior. Normal setting for reproduction output from the speaker unit 130 is performed for all persons. When the operation for generating the guide sound is started in such a normal setting, the superposition based on the addition result of the signal obtained by inverting the phase of the content sound signal ACS and the guide sound signal AGS from the navigation device 900 is performed. A single listening setting in which sound waves are output from the parametric speaker unit 140 is performed.

  As a result, the reproduced sound from the speaker unit 130 and the reproduced sound from the parametric speaker unit 140 reach the ears of the driver (single listener) sitting in the driver's seat. Even when the content audio based on the content audio signal ACS is reproduced and output, the content audio is effectively canceled by the audio component at the driver's ear. Therefore, the guide voice based on the guide voice signal AGS is heard by the driver in a clear manner. On the other hand, for the passengers other than the driver, as in the case of the first embodiment, the state in which only the reproduced sound from the speaker unit 130 is audible is maintained, and the content sound based on the content sound signal ACS from the speaker unit 130 is maintained. Is reproduced and output, passengers other than the driver can continue to listen to the content sound without being disturbed by the call reception sound.

  Therefore, according to the second embodiment, as in the case of the first embodiment described above, it is possible to provide sound appropriate for each person staying in the vehicle interior.

  Further, in the second embodiment, if the provision of the guide voice to all the passengers is specified during the generation of the guide voice by the navigation device 900, the ultrasonic output from the parametric speaker unit 140 is stopped, and the content sound source The content audio signal ACS from the unit 110 is set to a “0” level signal, and a multiple listening setting is performed in which audio based on the guide audio signal AGS is reproduced and output from the speaker unit 130. As a result, the voice based on the guide voice signal AGS is provided in a clear manner to all the passengers. Therefore, according to the driver's selection, the guide voice can be provided only to the driver or to all the passengers.

  Further, in the second embodiment, since the ultrasonic output from the parametric speaker unit 140 is stopped during the normal setting and the multiple listening setting, unnecessary power consumption can be prevented.

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

  For example, in the first embodiment, the call communication unit 120 is configured as a mobile phone module, but may be configured as another call communication module such as a car phone module.

  In the second embodiment, the signal source that supplies only the audio signal that can be generated in parallel with the content audio signal ACS is the navigation device 900 installed outside. It can also be. Such a signal source may be installed inside the audio signal processing apparatus.

  Moreover, in said 1st and 2nd embodiment, although the parametric speaker was employ | adopted as a strong directivity speaker, another kind of strong directivity speaker can also be employ | adopted.

  In the first and second embodiments described above, when all the passengers listen to audio different from the content audio by all the passengers, the audio different from the content audio is output only from the speaker unit 130. did. On the other hand, even when all passengers listen to audio different from the content audio by all passengers, the audio is provided to the driver using the parametric speaker unit 140 and other than the driver. On the other hand, the sound can be provided from the speaker unit 130. In this case, the mute setting is not performed for the content sound source unit 110 as in the first and second embodiments described above, but the signal level of the content audio signal ACS is attenuated by a predetermined attenuation rate. It can also be done.

  In the first and second embodiments, the present invention is applied to the audio signal processing device mounted on the vehicle. However, the present invention is applied to the audio signal processing device mounted on a moving body other than the vehicle. Can also be applied. Furthermore, the present invention can also be applied to an audio signal processing apparatus that is fixedly installed in a house or the like.

From a first aspect, the present invention provides a first speaker for a plurality of listeners; a second speaker that is a parametric speaker for a specific listener among the plurality of listeners; A first signal source that outputs an audio signal to the first speaker; a signal obtained by inverting the phase of the audio signal from the first signal source, and an audio signal from the first signal source; First adding means for adding the audio signals from the second signal sources having different contents; generating an ultrasonic signal from the audio signal added by the first adding means; and generating the generated ultrasonic wave And an ultrasonic signal generation unit that outputs a signal toward the second speaker .

From a second viewpoint, the present invention provides a first speaker for a plurality of listeners; a second speaker that is a parametric speaker for a specific listener among the plurality of listeners; An audio signal processing method used in an audio signal processing apparatus comprising: a first signal source that outputs an audio signal toward the first speaker, wherein the audio signal from the first signal source is phase inversion step and to phase inversion; and the phase inverted signal, summing step and for adding the sound signal from the second signal source content is different from the audio signal from the first signal source; said adder And a generating step of generating an ultrasonic signal from the audio signal added in the step and outputting the generated ultrasonic signal toward the second speaker. is there

The speaker output sound processing unit 191 generates the sound signal AOF supplied to the speaker unit 130 and the ultrasonic signal AOS supplied to the parametric speaker unit 140. As shown in FIG. 2, the speaker output sound processing unit 191 having such a function includes an output selection unit 211 as a selection unit, an inversion unit 212 as a part of the first addition unit, and a first addition unit. And an adder 213 as a control means and an ultrasonic signal generator 214. In addition, the speaker output sound processing unit 191 includes an addition unit 216 as a second addition unit and a power amplification unit 217.

Claims (7)

A first speaker intended for a plurality of listeners;
A strongly directional second speaker intended for a specific listener of the plurality of listeners;
A first signal source for outputting an audio signal toward the first speaker;
The signal obtained by inverting the phase of the audio signal from the first signal source and the audio signal from the second signal source having different contents from the audio signal from the first signal source are added, and the second First adding means for outputting to a speaker;
An audio signal processing device comprising: Selection means for selectively outputting an audio signal from the second signal source toward either the first addition means or the first speaker;
A second addition means for adding the audio signal from the first signal source and the signal from the selection means and outputting the result to the first speaker;
The first signal source includes a volume adjustment unit;
When the second adding unit is selected as the output destination of the audio signal from the second signal source from the selecting unit, the volume adjusting unit is configured to output the audio signal from the first signal source. Make adjustments to reduce the signal level,
The audio signal processing apparatus according to claim 1. The particular listener is a vehicle driver;
The audio signal from the second signal source is an audio signal from a call communication means.
The audio signal processing apparatus according to claim 2. The particular listener is a vehicle driver;
The audio signal from the second signal source is a guide audio signal from the navigation means.
The audio signal processing apparatus according to claim 2.   The audio signal processing apparatus according to claim 3 or 4, wherein the second speaker is a parametric speaker. Detecting means for detecting an operating state for generating an audio signal in the second signal source;
Control means for limiting an output signal level from the parametric speaker when it is determined that the second signal source is not in an operation state for generating the audio signal;
The audio signal processing apparatus according to claim 5, further comprising: A first speaker for a plurality of listeners; a strongly directional second speaker for a specific listener among the plurality of listeners; and an audio signal toward the first speakers An audio signal processing method used in an audio signal processing apparatus comprising: a first signal source that outputs:
A phase inversion step of phase inverting the audio signal from the first signal source;
An adding step of adding the phase-inverted signal and an audio signal from a second signal source whose contents are different from those of the audio signal from the first signal source, and outputting the result to the second speaker; ;
An audio signal processing method comprising:

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