JP2006270601A - Hands-free calling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hands-free calling device which is capable of making a calling voice clearer independently of the types of telephone devices. <P>SOLUTION: The control unit 115 of an on-vehicle machine 1 transmits reference voices previously stored in a reference voice data storage 116 to a server device 4 through a mobile telephone device 2. The received-voice volume detecting unit 42 of the server device 4 detects the sound volume of reference voices received through the mobile telephone device 2, a received-sound volume notifying unit 43 transmits the received sound volume notifying sound having a prescribed sound volume level representing the sound volume level of the detected reference voices to the mobile telephone device 2. The control unit 115 of the on-vehicle machine 1 adjusts the sound volume gain of the sending system of the on-vehicle machine 1, responding to the sound volume level represented by the received sound volume notifying sound received from the server device 4 through the mobile telephone device 2 and adjusts also the sound volume gain of the receiving system of the on-vehicle machine 1, responding to the sound volume level of the received receiving volume notifying sound. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for improving the clarity of call voice in a hands-free call device that adds a hands-free call function to a telephone.

There is a form called a hands-free call as a call form of a user using a telephone.
The hands-free call is a call using a telephone using a microphone and a speaker outside the telephone for input of transmitted voice and output of received voice. Here, a device that includes a speaker that radiates received voice and a microphone that picks up transmitted voice and adds the above-described hands-free calling function to a mobile telephone (also referred to as a “mobile phone”) is a hands-free device. It is called a call device, etc., and is mainly used to enable a user who is installed in a car and is driving to perform a hands-free call using a mobile phone.

On the other hand, as a technique for improving the intelligibility of call voice using a telephone, for each telephone number of the callee, the reception volume level and transmission set by the user for the telephone during the call with the callee are set. If the call volume level is stored in advance, and the call destination is subsequently called, the received volume level and the send volume level stored for the phone number of the call destination are automatically set to the phone. A technique for setting is known (for example, Patent Document 1).
Japanese Patent Laid-Open No. 7-312639

  In a hands-free call device mounted on an automobile, a hands-free call function is provided to a telephone connected to the hands-free call device by a user. Thus, the type of telephone connected by the user to the hands-free call device cannot be specified in advance. On the other hand, the gain characteristics of the received voice and transmitted voice on the telephone vary depending on the type of telephone, and even if the hands-free call device adjusts the volume of the received voice or transmitted voice with the same gain characteristic, The volume of the sound that can be heard is different.

For this reason, conventionally, the gain characteristics of the reception voice and transmission voice of the hands-free call device are adjusted so that the user himself / herself can make a clear call whenever the phone model used for the hands-free call is changed. There was a problem that had to be.
In addition, such a problem caused by the difference in gain characteristics of the telephone connected to the hands-free call device automatically sets the reception volume level and the transmission volume level according to the telephone number of the call destination described above. Applying this technology to a hands-free communication device does not provide a solution.

  Therefore, an object of the present invention is to provide a hands-free call device capable of clarifying call voice regardless of the connected telephone model.

  In order to achieve the above object, the present invention provides a hands-free call device that provides a hands-free call function for a connected telephone, with a microphone, a speaker, and a transmission voice gain in which a sound input from the microphone is set. A transmission voice processing unit that amplifies and outputs to the connected telephone as a transmission voice to be transmitted by the telephone, and a reception voice received by the telephone that is input from the connected telephone is set to a set reception voice gain. A reception volume level notification service for transmitting a volume level notification sound representing a volume level of a voice received via a voice communication line and a reception voice processing unit that amplifies the received voice signal through the voice communication line And a server device connection means for establishing a voice communication line with the server device for performing the phone when the phone is connected, the phone and the server. A reference sound transmitting means for outputting a reference sound prepared in advance in the telephone as the transmission voice when a voice communication line is established with the apparatus; and the telephone input as a reception voice from the mobile telephone; A transmission-system volume gain adjustment unit that adjusts a value of the transmission voice gain set in the transmission system voice processing unit in accordance with a volume level represented by a volume level notification sound received from the server device; It is.

  Here, the volume level indicated by the volume level notification sound increases or decreases in accordance with the gain of the transmitted voice applied at the telephone. Therefore, by adjusting the value of the transmission voice gain set in the transmission voice processing unit of the hands-free call device according to the volume level represented by the volume level notification sound as described above, the transmission voice of the telephone is set. The gain characteristic of the transmission voice of the hands-free call device can be adjusted so as to cancel the deviation of the gain characteristic from the standard gain characteristic assumed in advance. That is, the volume of the transmitted voice output to the call destination can be adjusted to a predetermined volume level regardless of the telephone, and the call voice can be clarified.

  In addition, in such a hands-free call device, the volume level of the volume level notification sound received from the server device, which is input from the mobile phone as the received voice, is detected, and the detected volume level notification sound is detected. Accordingly, it is also preferable to provide a reception sound volume gain adjusting means for adjusting the value of the reception sound gain set in the reception sound processing unit.

  Here, the volume level of the volume level notification sound detected in the hands-free call device increases or decreases according to the gain level of the received voice applied in the telephone. Therefore, by adjusting the value of the received voice gain set in the received voice processing unit of the hands-free call device according to the volume level of the volume level notification sound as described above, the gain characteristic of the received voice of the telephone is adjusted. The gain characteristic of the received voice of the hands-free call device can be adjusted so as to cancel the deviation from the standard gain characteristic assumed in advance. That is, the volume of the received voice that is output to the user can be adjusted to a predetermined volume level regardless of the telephone, and the call voice can be clarified.

  In order to achieve the above object, the present invention provides a transmission voice in which a microphone, a speaker, and a voice input from the microphone are set in a hands-free call device that provides a hands-free call function to a connected telephone. A transmission voice processing unit that amplifies with a gain and outputs to a connected telephone as a transmission voice to be transmitted by the telephone, and a reception voice received by the telephone that is input from the connected telephone. Audio communication between a reception-system audio processing unit that amplifies with audio gain and outputs to the speaker, and a server device that provides a calibration sound transmission service that transmits a calibration sound of a predetermined volume level via an audio communication line A server apparatus connection means for establishing a line on the telephone when the telephone is connected, and a voice input from the mobile telephone is received by the telephone. Receiving volume level adjustment means for detecting the volume level of the received calibration sound and adjusting the value of the received voice gain set in the receiving voice processing unit according to the detected volume level of the calibration sound; It is equipped with.

  Here, the volume level of the calibration sound detected in the hands-free call device increases or decreases in accordance with the magnitude of the gain of the received voice applied in the telephone. Therefore, by adjusting the value of the received voice gain set in the received voice processing unit of the hands-free call device in accordance with the volume level of the calibration sound as described above, the gain characteristic of the received voice of the telephone is set in advance. The gain characteristic of the received voice of the hands-free call device can be adjusted so as to cancel the deviation from the assumed standard gain characteristic. That is, the volume of the received voice that is output to the user can be adjusted to a predetermined volume level regardless of the telephone, and the call voice can be clarified.

  In order to achieve the above object, the present invention provides a transmission voice in which a microphone, a speaker, and a voice input from the microphone are set in a hands-free call device that provides a hands-free call function to a connected telephone. A transmission voice processing unit that amplifies with a gain and outputs to a connected telephone as a transmission voice to be transmitted by the telephone, and a reception voice received by the telephone that is input from the connected telephone. Depending on the volume level of the received voice that the telephone outputs to the hands-free call device, to the telephone connected to the telephone when the telephone is connected to the reception voice processing unit that is amplified by the voice gain and output to the speaker A calibration sound having a predetermined volume level is output to the hands-free call device, the volume level of the calibration sound output by the telephone is detected, and the calibration sound detected Depending on the amount level, in which a volume gain adjustment means for adjusting the value of the received speech sound gain to be set to the received sound processing unit.

  Here, the volume level of the calibration sound detected in the hands-free call device increases or decreases according to the volume level of the received voice output from the telephone. Therefore, the volume level of the received voice output from the telephone is adjusted by adjusting the value of the received voice gain set in the received voice processing unit of the handsfree call device according to the volume level of the calibration sound as described above. The gain characteristic of the received voice of the hands-free call device can be adjusted so as to cancel the deviation from the standard volume level assumed in advance. That is, the volume of the received voice that is output to the user can be adjusted to a predetermined volume level regardless of the telephone, and the call voice can be clarified.

  In order to achieve the above object, the present invention provides a transmission voice in which a microphone, a speaker, and a voice input from the microphone are set in a hands-free call device that provides a hands-free call function to a connected telephone. A transmission voice processing unit that amplifies with a gain and outputs to a connected telephone as a transmission voice to be transmitted by the telephone, and a reception voice received by the telephone that is input from the connected telephone. A reception voice processing unit that amplifies with a voice gain and outputs to the speaker, and a transmission voice input from the hands-free communication device to the telephone connected when the telephone is connected, Loopback control means for looping back from a transmitted voice processing system for processing voice to a received voice processing system for processing received voice in the telephone; and the telephone A reference sound prepared in advance is output as the transmission voice to the connected telephone when connected, and the volume level of the reference sound output as the reception voice from the telephone is detected, and the volume of the detected reference sound is detected. Volume gain adjusting means for adjusting the value of the received voice gain set in the received voice processing unit according to the level is provided.

  Here, the volume level of the reference sound detected in the hands-free call device increases or decreases in accordance with the sum of the gain of the transmission voice and the gain of the reception voice in the telephone. In general, the tendency of deviation between the gain of the transmission voice of the telephone and the gain of the reception voice from the standard gain characteristic often coincides. Therefore, the volume level of the received voice output from the telephone is adjusted by adjusting the value of the received voice gain set in the received voice processing unit of the handsfree call device according to the volume level of the reference sound as described above. It can be expected that the gain characteristic of the received voice of the hands-free call device can be adjusted so as to cancel the deviation from the standard volume level assumed in advance. That is, it can be expected that the call voice can be clarified by adjusting the volume level of the received voice output to the user to a predetermined volume level regardless of the telephone.

  Note that the above hands-free call device may be an in-vehicle hands-free call device mounted on an automobile, and the telephone may be a mobile phone.

  As described above, according to the present invention, it is possible to provide a hands-free call device capable of clarifying call voice regardless of the connected telephone model.

Hereinafter, embodiments of the present invention will be described with reference to an example of application to an in-vehicle device that is mounted on a vehicle and provides a hands-free call function to a mobile phone generally called a mobile phone.
First, the first embodiment will be described.
FIG. 1 shows the configuration of the hands-free call system according to the first embodiment.
As shown in the figure, the hands-free call system includes an in-vehicle device 1, a mobile phone 2 that is detachably connected to the in-vehicle device 1, and a server to which the mobile phone 2 can connect a voice communication line via a mobile phone network 3. The apparatus 4 is comprised.
The in-vehicle device 1 includes a microphone 101, an input amplifier 102, a user-side echo canceller 103, a first transmission amplifier 104, a noise canceller 105, a second transmission amplifier 106, a line-side echo canceller 107, a linear codec 108, a selector 109, The mobile telephone interface unit 110, the first reception amplifier 111, the second reception amplifier 112, the output amplifier 113, the speaker 114, the control unit 115, and the reference voice data storage unit 116 are provided.

Such an in-vehicle device 1 is connected to the mobile phone 2 by, for example, short-range wireless communication such as Bluetooth (registered trademark) or wired connection in the mobile phone interface unit 110.
In addition, the server device 4 includes a telephone function unit 41, a received sound volume detection unit 42, a received sound volume notification unit 43, and a server control unit 44.
Hereinafter, the operation of such a hands-free call system will be described.
First, the operation at the time of a normal hands-free call with an arbitrary call destination started by an incoming call or user call operation will be described. In this normal hands-free call, the control unit 115 causes the selector 109 to output the transmission voice output from the linear codec 108 to the mobile telephone interface unit 110 and linearly receives the reception voice input from the mobile telephone interface unit 110. The codec is output.

  Now, when the mobile telephone 2 is connected to the telephone of the other party via the mobile telephone network 3 and a telephone communication state is established between the two telephones by the voice communication line established thereby, the voice uttered by the user in the vehicle is the microphone 101. Then, after being picked up as a transmitted voice and amplified by the input amplifier 102, an echo canceling process for canceling a wraparound received voice component from the speaker 114 to the microphone 101 is performed by the user side echo canceller. The transmitted voice subjected to the echo cancellation processing is adjusted in volume level by the first transmission amplifier 104, then the noise component is removed by the noise canceller 105, and the volume level is adjusted by the second transmission amplifier 106. . The transmitted voice whose volume level is adjusted by the second transmission amplifier 106 passes through the line-side echo canceller 107 and is converted into a digital signal by the linear codec 108. The transmitted voice converted into the digital signal passes through the selector 109 and is sent to the mobile telephone interface unit 110, and is sent to the mobile telephone 2 by the mobile telephone interface unit 110 as transmitted voice. Then, the mobile telephone 2 transmits the transmission voice sent from the in-vehicle device 1 to the telephone of the call destination.

  On the other hand, the received voice received by the mobile telephone 2 from the destination telephone is sent to the mobile telephone interface unit 110 as a digital received voice. The received voice received by the mobile phone interface unit 110 is sent from the selector 109 to the linear codec 108 and converted into an analog received voice. The received voice converted to the analog signal is sent to the line-side echo canceller 107 after the volume is adjusted by the first receiver amplifier 111, and the line-side echo canceller 107 cancels the echo component at the call destination of the transmitted voice. Echo cancellation processing is performed and output to the second receiver amplifier 112 to adjust the volume. The reception voice whose volume is adjusted by the second reception amplifier 112 passes through the user-side echo canceller 103, is amplified by the output amplifier 113, and then is output from the speaker 114.

Next, transmission / reception voice adjustment processing performed by the control unit 115 when the mobile phone 2 is connected to the vehicle-mounted device 1 will be described.
FIG. 2 shows the procedure of the transmission / reception voice adjustment processing.
As shown in the figure, in this process, the mobile telephone 2 is first waited for the user to connect to the mobile telephone interface unit 110 (step 202). When the mobile telephone 2 is connected, the mobile telephone 2 and the telephone model information registered in the mobile telephone 2 are registered via the mobile telephone interface unit 110 into the mobile telephone identifier. (Step 204).

  Next, it is checked whether or not the read mobile phone identifier is registered in the volume gain adjustment table (step 206). Here, the volume gain adjustment table is a table held by the control unit 115. In the volume gain adjustment table, as shown in FIG. A plurality of entries describing the transmission system volume gain and the reception system volume gain can be registered.

  Now, returning to FIG. 2, when the read mobile phone identifier is registered in the volume gain adjustment table (step 206), the read mobile phone identifier in the volume gain adjustment table is described in the registered entry. The transmission system volume gain and reception system volume gain are read out, and the read transmission system volume gain and reception system volume gain are read, the transmission system volume gain of the in-vehicle device 1 and the reception system volume gain of the in-vehicle device 1 are read. (Step 224), and the process returns to step 202. Here, the volume gain of the transmission system of the in-vehicle device 1 is adjusted by adjusting the gain of all or part of the input amplifier 102, the first transmission amplifier 104, and the second transmission amplifier 106. Further, the volume gain of the reception system of the in-vehicle device 1 is adjusted by adjusting the gains of all or a part of the first reception amplifier 111, the second reception amplifier 112, and the output amplifier 113.

  On the other hand, when the read mobile phone identifier is not registered in the volume gain adjustment table (step 206), the mobile phone 2 is controlled via the mobile phone interface unit 110, and the mobile phone 2 is connected to the server device 4. A call is made to establish a voice communication line with the server device 4 (step 208).

  Then, the voice data of the reference voice stored in advance in the reference voice data storage unit 116 is output to the selector 109, and the voice data from the control unit 115 is sent to the selector 109 to be transmitted from the linear codec 108. The reference voice is transmitted to the server device 4 via the mobile telephone 2 by causing the mobile telephone interface unit 110 to output the voice instead of the voice to the mobile telephone interface unit 110 (step 210). In addition, the selector 109 causes the control unit 115 to output the received voice input from the mobile telephone interface unit 110 instead of the linear codec 108.

As the reference voice, for example, a user's voice input from the microphone 101 stored in advance in the reference voice data storage unit 116 may be used, or an arbitrary voice of a predetermined volume level is used. You may do it.
Now, returning to FIG. 1, the telephone function unit 41 of the server device 4 outputs the reference voice received from the mobile telephone 2 to the received sound volume detection unit 42. The received sound volume detection unit 42 detects the volume level of the reference voice output by the telephone function unit 41 and notifies the server control unit 44 of it. The server control unit 44 causes the reception volume notification unit 43 to generate a reception volume notification sound that is an audio signal generated by encoding the notified volume level (representing the notified volume level). Here, the volume level of the reception volume notification sound is set to a predetermined volume level.

  The received sound volume notification sound generated by the received sound volume notification unit 43 is sent to the telephone function unit 41 and transmitted from the telephone function unit 41 to the mobile telephone 2. Here, as such a reception volume notification sound, for example, a DTMF signal can be used. That is, in this case, the volume level detected by the reception volume detector 42 is encoded as a DTMF sound, and this DTMF sound is transmitted to the mobile telephone 2 as a reception volume notification sound. However, the volume level of the DTMF sound is always set to a constant volume level.

  Returning to FIG. 2, if the reference voice is transmitted to the server apparatus 4, it waits for reception volume notification sound from the server apparatus 4 via the mobile telephone 2, the mobile telephone interface unit 110, and the selector 109 (step 212). If the received sound volume notification sound is received, the volume level of the received received sound volume notification sound is detected (step 214). Further, the volume level represented by the received reception volume notification sound (the volume level detected by the received volume detection unit 42 of the server device 4) is decoded (step 216).

  Then, the volume gain of the transmission system of the vehicle-mounted device 1 is adjusted according to the volume level decoded at step 216 (step 218), and the vehicle-mounted device according to the volume level of the received volume notification sound detected at step 214. The volume gain of the receiving system 1 is adjusted (step 220). Note that the correspondence between the volume level decoded in step 216 and the volume gain adjustment amount of the transmission system of the in-vehicle device 1, the volume level of the reception volume notification sound detected in step 214, and the reception system of the in-vehicle device 1. The correspondence with the volume gain adjustment amount is set in the control unit 115 in advance.

  Now, the volume level decoded in step 216 (the volume level detected by the received volume detection unit 42 of the server device 4) increases or decreases according to the gain of the transmitted voice of the mobile telephone 2. In addition, the volume level of the received volume notification sound detected in step 214 is increased or decreased according to the gain of the received voice of the mobile telephone 2.

  Accordingly, by adjusting the volume gain of the transmission system of the in-vehicle device 1 according to the volume level decoded in step 216 as described above, a standard gain assumed in advance of the gain characteristic of the transmission voice of the mobile phone 2 is assumed. The gain characteristic of the transmission system of the in-vehicle device 1 can be adjusted so as to cancel the deviation from the characteristic. Further, by adjusting the volume gain of the reception system of the in-vehicle device 1 according to the volume level of the reception volume notification sound detected in step 214, a standard gain characteristic assumed in advance of the gain characteristic of the reception voice of the mobile phone 2 is set. The gain characteristic of the receiving system of the in-vehicle device 1 can be adjusted so as to cancel the deviation from the receiver. That is, the volume level of the received voice output to the user and the transmitted voice transmitted to the call destination can be adjusted to a predetermined volume level regardless of the mobile telephone 2 to realize call voice clarification. it can.

  As described above, if the gains of the transmission system and the reception system of the vehicle-mounted device 1 are adjusted in steps 218 and 220, a new entry is created in the volume gain adjustment table. The mobile telephone identifier (model and telephone number of the mobile telephone 2) acquired from the mobile telephone 2 in step 204, the adjustment amount of the transmission system gain of the in-vehicle device 1 and the adjustment of the reception system gain performed in steps 218 and 220. The amount is registered (step 222), and the process returns to step 202.

The first embodiment of the present invention has been described above.
By the way, in the first embodiment described above, the server device 4 transmits a reception volume notification sound having a predetermined volume level. In the in-vehicle device 1, the volume level of the reception volume notification sound is detected in step 214, and in step 220, step 214. The volume gain of the receiving system of the in-vehicle device 1 is adjusted according to the volume level detected in step S4. This is because the server apparatus 4 generates and transmits an adjustment sound of a predetermined volume level separately from the reception volume notification sound. Thus, the volume level of the adjustment sound to be input to the vehicle-mounted device 1 via the mobile telephone 2 is detected by the vehicle-mounted device 1 in step 214, and the volume of the adjustment sound detected in step 214 is detected in step 220. Depending on the level, the volume gain of the receiving system of the in-vehicle device 1 may be adjusted.

Hereinafter, a second embodiment of the present invention will be described.
FIG. 4 shows the configuration of the hands-free call system according to the second embodiment. As illustrated, in the hands-free call system according to the second embodiment, the server device 4 in the hands-free call system according to the first embodiment is eliminated.
The configuration of the in-vehicle device 1 according to the second embodiment is the same as the configuration of the in-vehicle device 1 according to the first embodiment. On the other hand, in the second embodiment, the mobile telephone 2 is configured as follows.
That is, as shown in FIG. 4, the mobile telephone 2 includes a host interface 201 for communicating with the mobile telephone interface unit 110 of the in-vehicle device 1, a call voice processing unit 202, and call control of a voice communication line for the mobile telephone network 3. A mobile telephone network interface 203 that performs input / output processing of call voice with the mobile telephone network 3, a transmission volume detection unit 204, a transmission volume notification unit 205, a volume notification selector 206, a mobile phone control unit 207, and the in-vehicle device 1 A microphone 208 and a speaker 209 that constitute a handset used for input / output of voice communication with a user when not connected.

  In such a configuration, the operation of the mobile telephone 2 at the time of a normal hands-free call with an arbitrary call destination started by an incoming call or user call operation is as follows. The operation of the in-vehicle device 1 during this normal hands-free call is the same as the operation of the in-vehicle device 1 in the first embodiment.

  When the mobile telephone 2 makes a call connection with the telephone of the call destination via the mobile telephone network 3 and enters a call state between the two telephones via the voice communication line established thereby, the call voice processing unit 202 passes through the host interface 201. Then, a predetermined voice process is performed on the transmitted voice received from the in-vehicle device 1 and output to the mobile telephone network interface 203. At this time, the volume level of the transmitted voice output to the mobile telephone network interface 203 is in accordance with the gain characteristics of the voice processing that the call voice processing unit 202 applies to the transmitted voice. The mobile telephone network interface 203 transmits the transmission voice received from the call voice processing unit 202 to the telephone of the call destination. Further, the mobile telephone network interface 203 outputs the received voice received from the telephone of the call destination to the volume notification selector 206. In a normal hands-free call, the mobile telephone control unit 207 causes the volume notification selector 206 to output the received voice input from the mobile telephone network interface 203 to the call voice processing unit 202 as it is. The call voice processing unit 202 performs predetermined voice processing on the received incoming voice and transmits it to the in-vehicle device 1 via the host interface 201. At this time, the volume level of the received voice output to the host interface 201 is in accordance with the gain characteristic of the voice processing that the call voice processing unit 202 applies to the received voice.

Hereinafter, the operation of the hands-free call system when the mobile phone 2 is connected to the vehicle-mounted device 1 will be described.
FIG. 5 illustrates a transmission / reception voice adjustment process performed by the control unit 115 when the in-vehicle device 1 of the mobile phone 2 is connected in the second embodiment.
As shown in the figure, this process waits for the mobile telephone 2 to be connected to the mobile telephone interface unit 110 by the user (step 502), similar to the transmission / reception voice adjustment process in the first embodiment. If the mobile telephone 2 is connected, the mobile telephone 2 phone number and the telephone model information registered in the mobile telephone 2 are read out as the mobile telephone identifier from the mobile telephone 2 via the mobile telephone interface unit 110. (Step 504). Then, it is checked whether or not the read mobile phone identifier is registered in the volume gain adjustment table (step 506). If the read mobile phone identifier is registered in the volume gain adjustment table, the volume gain adjustment table is checked. The transmission system volume gain and reception system volume gain described in the entry in which the read mobile telephone identifier is registered are read out, and the transmission of the vehicle-mounted device 1 is used as the readout transmission system volume gain and reception system volume gain. The volume gain of the system and the volume gain of the reception system of the in-vehicle device 1 are adjusted (step 526), and the process returns to step 502.

On the other hand, if the read mobile phone identifier is not registered in the volume gain adjustment table (step 506), the volume detection mode is set in the mobile phone control unit 207 of the mobile phone 2 via the mobile phone interface unit 110. To do.
Then, the voice data of the reference voice stored in advance in the reference voice data storage unit 116 is output to the selector 109, and the voice data from the control unit 115 is sent to the selector 109 to be transmitted from the linear codec 108. The reference voice is output to the mobile telephone 2 by causing the mobile telephone interface unit 110 to output the voice instead of the voice to the mobile telephone interface unit 110 (step 510). Further, the selector 109 causes the control unit 115 to output the received voice input from the mobile telephone 2 via the mobile telephone interface unit 110 instead of the linear codec 108.

  Returning to FIG. 4, the mobile phone control unit 207 of the mobile phone 2 causes the mobile phone 2 to perform the following operation when the volume detection mode is set by the in-vehicle device 1. In other words, the call voice processing unit 202 performs voice processing on the reference voice received from the in-vehicle device 1 via the host interface 201 as a transmission voice and outputs it. The transmission volume detection unit 204 detects the volume level of the reference voice output from the call voice processing unit 202 and notifies the transmission volume notification unit 205 of it. The transmission volume notification unit 205 generates a transmission volume notification sound, which is an audio signal generated by encoding the notified volume level (representing the detected volume level), and outputs the transmission volume notification sound to the volume notification selector 206. Here, the volume level of the transmission volume notification sound is a predetermined volume level.

  Next, the volume notification selector 206 outputs the transmission volume notification sound input from the transmission volume notification unit 205 to the call voice processing unit 202 instead of the received voice input from the mobile telephone network interface 203. The call voice processing unit 202 performs voice processing on the transmission volume notification sound input from the volume notification selector 206 as a received voice, and outputs it to the in-vehicle device 1 via the host interface 201.

  As a result, in the mobile telephone 2, the volume level of the reference voice after the transmission voice processing is performed by the call voice processing unit 202 is detected, and the transmission is a voice signal having a predetermined volume level representing the detected volume level. A volume notification sound is generated. Then, the transmission sound volume notification sound is sent to the in-vehicle device 1 after the call voice processing unit 202 performs the receiving voice processing.

  Returning to FIG. 5, when the control unit 115 of the in-vehicle device 1 outputs the reference voice to the mobile phone 2, the control unit 115 receives the transmission volume notification sound from the mobile phone 2 via the mobile phone interface unit 110 and the selector 109. (Step 512), if a transmission volume notification sound is received, the volume level of the received transmission volume notification sound is detected (step 514). Also, the volume level represented by the received transmission volume notification sound (the volume level of the reference voice detected by the transmission volume detection unit 204 of the mobile phone 2) is decoded (step 516).

  Then, the volume gain of the transmission system of the vehicle-mounted device 1 is adjusted according to the volume level decoded at step 516 (step 518), and the vehicle-mounted device according to the volume level of the transmission volume notification sound detected at step 514. The volume gain of the receiving system 1 is adjusted (step 520). It should be noted that the correspondence between the volume level decoded at step 516 and the volume gain adjustment amount of the transmission system of the in-vehicle device 1, the volume level of the reception volume notification sound detected at step 514, and the reception system of the in-vehicle device 1. The correspondence with the volume gain adjustment amount is set in the control unit 115 in advance.

  Here, the volume level decoded in step 516 increases or decreases according to the magnitude of the gain of the transmitted voice in the call voice processing unit 202 of the mobile telephone 2. Further, the volume level of the transmission volume notification sound detected in step 514 increases or decreases according to the gain of the received voice in the call voice processing unit 202 of the mobile telephone 2.

  Therefore, by adjusting the volume gain of the transmission system of the in-vehicle device 1 according to the volume level decoded in step 516 as described above, a standard gain assumed in advance of the gain characteristic of the transmission voice of the mobile phone 2 is assumed. The gain characteristic of the transmission system of the in-vehicle device 1 can be adjusted so as to cancel the deviation from the characteristic. Further, by adjusting the volume gain of the reception system of the vehicle-mounted device 1 according to the volume level of the transmission volume notification sound detected in step 514, a standard gain characteristic assumed in advance of the gain characteristic of the reception voice of the mobile phone 2 is set. The gain characteristic of the receiving system of the in-vehicle device 1 can be adjusted so as to cancel the deviation from the receiver. That is, the volume level of the received voice output to the user and the transmitted voice transmitted to the call destination can be adjusted to a predetermined volume level regardless of the mobile telephone 2 to realize call voice clarification. it can.

  As described above, if the gains of the transmission system and the reception system of the vehicle-mounted device 1 are adjusted in steps 518 and 520, a new entry is created in the volume gain adjustment table, The mobile phone identifier (model and phone number of the mobile phone 2) acquired from the mobile phone 2 in step 504, the adjustment amount of the transmission system gain of the in-vehicle device 1 and the gain of the reception system performed in steps 518 and 520 The amount is registered (step 522). Then, the volume detection mode of the mobile phone control unit 207 of the mobile phone 2 is canceled via the mobile phone interface unit 110 (step 524), and the process returns to step 502. In addition, after the volume detection mode is canceled, the mobile telephone 2 is connected to the telephone of the call destination via the mobile telephone network 3 by the mobile telephone 2 and is in a call state between both telephones by the voice communication line established thereby. When it becomes, the operation at the time of the normal hands-free call described above is performed.

The second embodiment of the present invention has been described above.
By the way, in the above second embodiment, the mobile telephone 2 transmits a transmission volume notification sound of a predetermined volume level, and the vehicle-mounted device 1 detects the volume level of the transmission volume notification sound in step 514, and in step 520, step 514 The volume gain of the receiving system of the in-vehicle device 1 is adjusted according to the volume level detected in step S1. This is because the transmission volume notification unit 205 of the mobile phone 2 adjusts the predetermined volume level separately from the transmission volume notification sound. Thus, the volume level of the adjustment voice input from the mobile telephone 2 is detected by the in-vehicle device 1 in step 514, and the volume level of the adjustment voice detected in step 514 is detected in step 520. Accordingly, the volume gain of the receiving system of the in-vehicle device 1 may be adjusted.

Hereinafter, a third embodiment of the present invention will be described.
FIG. 6 shows the configuration of the hands-free call system according to the third embodiment.
As shown in the drawing, the configuration of the hands-free call system according to the third embodiment is the same as the configuration of the hands-free call system according to the second embodiment, except for the transmission volume detection unit 204 and the transmission volume notification unit 205 of the mobile phone 2. The volume notification selector 206 is eliminated, and the mobile phone 2 is provided with a loopback selector 210 instead.

  In such a configuration, the operations of the in-vehicle device 1 and the mobile phone 2 at the time of a normal hands-free call with an arbitrary call destination started by an incoming call or user call operation are the same as the operations of the second embodiment. The same. However, at the time of this normal hands-free call, the mobile telephone control unit 207 of the mobile telephone 2 causes the call voice processing unit 202 to output the received voice input from the mobile telephone network interface 203 to the loopback selector 210.

Next, the operation of the hands-free call system when the mobile phone 2 is connected to the vehicle-mounted device 1 will be described.
FIG. 7 illustrates a transmission / reception voice adjustment process performed by the control unit 115 when the in-vehicle device 1 of the mobile telephone 2 is connected in the third embodiment.
As shown in the figure, this process waits for the mobile telephone 2 to be connected to the mobile telephone interface unit 110 by the user (step 702), similar to the transmission / reception voice adjustment process in the first embodiment. If the mobile telephone 2 is connected, the mobile telephone 2 phone number and the telephone model information registered in the mobile telephone 2 are read out as the mobile telephone identifier from the mobile telephone 2 via the mobile telephone interface unit 110. (Step 704). Then, it is checked whether or not the read mobile phone identifier is registered in the volume gain adjustment table (step 706). If the read mobile phone identifier is registered in the volume gain adjustment table, the volume gain adjustment table is checked. The transmission system volume gain and reception system volume gain described in the entry in which the read mobile telephone identifier is registered are read out, and the transmission of the vehicle-mounted device 1 is used as the readout transmission system volume gain and reception system volume gain. The volume gain of the system and the volume gain of the reception system of the in-vehicle device 1 are adjusted (step 720), and the process returns to step 702.

On the other hand, if the read mobile phone identifier is not registered in the volume gain adjustment table (step 706), the loopback mode is set in the mobile phone control unit 207 of the mobile phone 2 via the mobile phone interface unit 110. (Step 708).
Then, the voice data of the reference voice stored in advance in the reference voice data storage unit 116 is output to the selector 109, and the voice data from the control unit 115 is sent to the selector 109 to be transmitted from the linear codec 108. The reference voice is output to the mobile telephone 2 by causing the mobile telephone interface unit 110 to output the voice instead of the voice (step 710). Further, the selector 109 causes the control unit 115 to output the received voice input from the mobile telephone 2 via the mobile telephone interface unit 110 instead of the linear codec 108.

  Returning to FIG. 6, the mobile phone control unit 207 of the mobile phone 2 causes the mobile phone 2 to perform the following operation when the loopback mode is set by the in-vehicle device 1. In other words, the call voice processing unit 202 performs voice processing on the reference voice received from the in-vehicle device 1 via the host interface 201 as a transmission voice and outputs it. The loopback selector 210 outputs the reference voice output as the transmitted voice by the call voice processing unit 202 to the call voice processing unit 202 instead of the received voice input from the mobile telephone network interface 203. The call voice processing unit 202 processes the reference voice input from the loopback selector 210 as received voice, and outputs the received voice to the in-vehicle device 1 via the host interface 201.

As a result, in the mobile telephone 2, after the voice processing is performed in the transmission system of the call voice processing unit 202, the reference voice subjected to the voice processing in the reception system of the call voice processing unit 202 is sent to the in-vehicle device 1.
Returning to FIG. 7, when the reference unit 115 outputs the reference voice to the mobile phone 2, the control unit 115 of the in-vehicle device 1 detects the volume level of the reference voice received from the mobile phone 2 as a loopback volume level (step 712). . And according to the detected loopback volume level, the volume gain of the transmission system of the vehicle-mounted device 1 and the volume gain of the reception system of the vehicle-mounted device 1 are adjusted (step 714). Note that the loopback volume level detected in step 712 and the volume gain adjustment amounts of the reception system and transmission system of the in-vehicle device 1 are set in the control unit 115 in advance.

When the gains of the transmission system and the reception system of the vehicle-mounted device 1 are adjusted in step 714, a new entry is created in the volume gain adjustment table, and the created entry is previously received from the mobile telephone 2 in step 704. The acquired mobile phone identifier (model and phone number of the mobile phone 2) and the amount of adjustment of the transmission system gain and the amount of reception system gain of the in-vehicle device 1 performed in step 714 are registered (step 716). Then, the loopback mode is canceled in the mobile phone control unit 207 of the mobile phone 2 via the mobile phone interface unit 110 (step 718), and the process returns to step 702. In addition, after the loopback mode is canceled, the mobile phone 2 makes a call connection with the destination phone via the mobile telephone network 3 and enters a call state on both phones via the established voice communication line. In this case, the above-described operation during the normal hands-free call is performed. Here, the loopback volume level detected in step 712 is the gain of the transmission voice and the gain of the reception voice in the call voice processing unit 202 of the mobile phone 2. Increase or decrease according to the sum of In general, the tendency of deviation between the gain of the transmission voice and the gain of the reception voice in the call voice processing unit 202 of the mobile telephone 2 from the standard gain characteristic often coincides.

  Therefore, by adjusting the volume gain of the transmission system and reception system of the in-vehicle device 1 according to the loopback volume level detected in step 712 as described above, the transmission voice and reception voice of the mobile telephone 2 are adjusted. The gain characteristics of the transmission system and the reception system of the in-vehicle device 1 can be adjusted so as to cancel the deviation from the standard gain characteristics assumed in advance.

Heretofore, the third embodiment of the present invention has been described.
By the way, in the third embodiment described above, the reference voice input from the vehicle-mounted device 1 in the mobile telephone 2 is output from the host interface 201 to the call voice processing unit 202 as the received voice from the mobile telephone 2. The in-vehicle device 1 is configured to output a reference voice that has been subjected only to the reception voice processing of the call voice processing unit 202, and in the in-vehicle device 1, from the volume level of the reference voice input from the mobile phone 2, The gain of the receiving system of the mobile phone 2 is calculated, and the gain of the receiving system of the in-vehicle device 1 is canceled so as to cancel the deviation of the calculated gain from the standard gain of the receiving system of the mobile phone 2 according to the calculated gain. May be adjusted. In addition, the reference voice input from the in-vehicle device 1 in the mobile telephone 2 is output as the transmission voice from the host interface 201 to the call voice processing unit 202, and the call voice processing unit 202 outputs the voice after the voice processing of the transmission system. By outputting the reference voice directly to the host interface 201 as the received voice, the reference voice that has been subjected only to the transmission voice processing of the call voice processing unit 202 is output from the mobile telephone 2 to the in-vehicle device 1. In addition, in the in-vehicle device 1, the gain of the transmission system of the mobile phone 2 is calculated from the volume level of the reference voice input from the mobile phone 2, and the mobile phone 2 having the calculated gain is calculated according to the calculated gain. The transmission system gain of the in-vehicle device 1 may be adjusted so as to cancel the deviation from the standard transmission system gain.

In each of the above embodiments, the linear codec 108 of the in-vehicle device 1 is not necessary when the mobile telephone 2 outputs received voice or transmitted voice as analog voice.
In addition, detection of each volume level and adjustment of the transmission system gain and reception system gain of the in-vehicle device 1 in each of the above embodiments are performed for each frequency band, so that the transmission system of the in-vehicle device 1 is performed. Or the frequency characteristics of the reception system may be adjusted so as to cancel the deviation from the standard frequency characteristics of the transmission system and the frequency characteristics of the reception system of the call voice processing unit 202 of the mobile telephone 2. Good.

  Each of the above embodiments can be similarly applied to a case where a hands-free communication device that is not installed in a vehicle other than the vehicle-mounted device 1 is used instead of the vehicle-mounted device 1. In this case, the telephone to which the hands-free call device provides the hands-free function may be a telephone other than the mobile telephone 2, for example, a fixed telephone.

It is a block diagram which shows the structure of the hands-free call system which concerns on 1st Embodiment of this invention. It is a flowchart which shows the transmission / reception volume adjustment process which concerns on 1st Embodiment of this invention. It is a figure which shows the content of the volume gain adjustment table used in 1st Embodiment of this invention. It is a block diagram which shows the structure of the hands-free call system which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the transmission / reception volume adjustment process which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the hands-free call system which concerns on 3rd Embodiment of this invention. It is a flowchart which shows the transmission / reception volume adjustment process which concerns on 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle equipment, 2 ... Mobile telephone, 3 ... Mobile telephone network, 4 ... Server apparatus, 41 ... Telephone function part, 42 ... Received sound volume detection part, 43 ... Received sound volume notification part, 44 ... Server control part, 101 ... Microphone 102 ... Input amplifier 103 ... User side echo canceller 104 ... First transmission amplifier 105 ... Noise canceller 106 ... Second transmission amplifier 107 ... Line side echo canceller 108 ... Linear codec 109 ... Selector 110 DESCRIPTION OF SYMBOLS ... Mobile telephone interface part 111 ... 1st receiver amplifier, 112 ... 2nd receiver amplifier, 113 ... Output amplifier, 114 ... Speaker, 115 ... Control part, 116 ... Reference voice data storage part, 201 ... Host interface, 202 ... Call Voice processing unit 203 ... mobile telephone network interface, 204 ... transmission volume detection unit, 205 ... transmission volume notification unit, 2 6 ... volume notification selector, 207 ... mobile telephone control section, 210 ... loopback selector.

Claims (7)

A hands-free call device that provides a hands-free call function to a connected telephone,
With a microphone,
Speakers,
A transmission voice processing unit that amplifies the voice input from the microphone with a set transmission voice gain, and outputs to the connected telephone as a transmission voice to be transmitted by the telephone;
A reception voice processing unit that amplifies a reception voice received by the telephone input from a connected telephone by a set reception voice gain, and outputs the amplified voice to the speaker;
The telephone connects a voice communication line with a server device that performs a reception volume level notification service that transmits a volume level notification sound that represents a volume level of voice received via the voice communication line via the voice communication line. Server device connection means to be established in the telephone when
A reference sound sending means for outputting a reference sound prepared in advance in the telephone as the transmission voice when a voice communication line is established between the telephone and the server device;
The value of the transmission voice gain set in the transmission voice processing unit is set according to the volume level represented by the volume level notification sound received by the telephone set from the server device. A hands-free call device comprising: a transmission-type volume gain adjusting means for adjusting. A hands-free call device that provides a hands-free call function to a connected telephone,
With a microphone,
Speakers,
A transmission voice processing unit that amplifies the voice input from the microphone with a set transmission voice gain, and outputs to the connected telephone as a transmission voice to be transmitted by the telephone;
A reception voice processing unit that amplifies a reception voice received by the telephone input from a connected telephone by a set reception voice gain, and outputs the amplified voice to the speaker;
Server device connection for establishing a voice communication line with a server device that provides a calibration sound transmission service for transmitting a calibration sound at a predetermined volume level via a voice communication line when the phone is connected Means,
The volume level of the calibration sound input from the mobile phone as received voice is detected by the telephone set from the server device, and is set in the received voice processing unit according to the detected volume level of the calibration sound. A hands-free call device comprising: a reception-system volume gain adjustment means for adjusting the value of the reception voice gain. The hands-free call device according to claim 1,
The volume level of the volume level notification sound received by the telephone set from the server device, which is input as the received voice from the mobile telephone, is set in the reception voice processing unit according to the detected volume level notification sound. A hands-free call device characterized by having a reception volume gain adjustment means for adjusting a value of a reception voice gain.   4. A voice gain adjustment system for a hands-free call device, comprising: the hands-free call device according to claim 1, 2 or 3; and the server device. A hands-free call device that provides a hands-free call function to a connected telephone,
With a microphone,
Speakers,
A transmission voice processing unit that amplifies the voice input from the microphone with a set transmission voice gain, and outputs to the connected telephone as a transmission voice to be transmitted by the telephone;
A reception voice processing unit that amplifies a reception voice received by the telephone input from a connected telephone by a set reception voice gain, and outputs the amplified voice to the speaker;
When the telephone is connected, the telephone causes the telephone to output a calibration sound having a volume level corresponding to the volume level of the received voice that the telephone outputs to the hands-free telephone apparatus, and the telephone Volume level adjustment means for detecting the volume level of the calibration sound output from the voice signal and adjusting the value of the received voice gain set in the received voice processing unit according to the detected volume level of the calibration sound. A hands-free call device characterized by that. A hands-free call device that provides a hands-free call function to a connected telephone,
With a microphone,
Speakers,
A transmission voice processing unit that amplifies the voice input from the microphone with a set transmission voice gain, and outputs to the connected telephone as a transmission voice to be transmitted by the telephone;
A reception voice processing unit that amplifies a reception voice received by the telephone input from a connected telephone by a set reception voice gain, and outputs the amplified voice to the speaker;
Received speech processed by the telephone from the transmitted voice processing system for processing the transmitted voice in the telephone, and the transmitted voice input from the handsfree call device to the telephone connected when the telephone is connected Loopback control means for looping back to the voice processing system;
When the telephone is connected, the reference sound prepared in advance is output to the telephone as the transmission voice, and the volume level of the reference sound output as the reception voice from the telephone is detected, and the detected reference sound is detected. And a volume gain adjusting means for adjusting the value of the received voice gain set in the received voice processing unit according to the volume level of the receiver. The hands-free communication device according to claim 1, 2, 3, 5 or 6,
The hands-free call device is an in-vehicle hands-free call device mounted on an automobile, and the telephone is a mobile phone.