JP2011082883A - Audio signal processing apparatus, hands-free phone call device, and method of controlling audio signal processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain a predetermined phone call sound quality regardless of actual communication condition. <P>SOLUTION: A hands-free phone call device 10 connected with a communication terminal device 20 includes: a signal processing unit 15 providing an audio signal processing for adjusting a phone call sound quality to an utterance audio signal to transmit to a communication terminal device side; a signal level detection unit 16 detecting a signal level of a received audio signal corresponding to a received phone call audio of other communication party; an input level adjusting value setting part 17 setting an input level adjusting value for adjusting a signal level of the utterance audio signal so that the signal level of the utterance audio signal input to the signal processing unit 15 on the basis of the signal level of the received audio signal is the predetermined input level; and an input level adjustment unit 13b adjusting the signal level of the utterance audio signal on the basis of the set input level adjusting value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an audio signal processing device, a hands-free call device, and an audio signal processing that are connected to a communication terminal device that performs a voice call via a communication line and that performs signal processing on an audio signal transmitted to the communication terminal device side. The present invention relates to an apparatus control method.

2. Description of the Related Art In recent years, hands-free communication devices that allow users to talk without holding a mobile phone (communication terminal device) in vehicles such as automobiles have become widespread. Such a hands-free call device collects a user's utterance voice with a microphone and transmits the collected utterance voice to a communication partner's telephone via a mobile phone. Also, the received voice from the communication partner received by the mobile phone is output from the speaker into the vehicle.
In this type of hands-free call device, there is a case where the received voice output from the speaker is picked up by a microphone and an echo is generated. In addition, when a call is made while the vehicle is running, noise such as a running sound of the vehicle may be collected by the microphone. For this reason, conventionally, this type of hands-free communication device has an echo canceller device that cancels the generated echo (see, for example, “Patent Document 1”), and reduces noise such as vehicle running noise. Some have a noise reduction device.

JP 2007-36679 A

However, in the above-described conventional hands-free call device, the parameter values used for echo cancellation processing and noise reduction processing are set in advance according to the vehicle type on which the hands-free call device is mounted. Yes.
However, for example, aspects of echo and noise generated during a call are the volume level of the received voice input from the mobile phone connected to the hands-free call device, the installation position of the microphone and the speaker arranged in the vehicle, the vehicle It depends on the actual call situation such as the running state of the car. Therefore, even if parameter values set in advance for each vehicle type are used, the performance of the echo canceller device and noise reduction device cannot be fully demonstrated, and echo and noise may remain depending on the actual call situation. There are cases where the predetermined call sound quality assumed at times cannot be maintained.
The present invention has been made in view of the above-described circumstances, and controls an audio signal processing device, a hands-free call device, and an audio signal processing device capable of maintaining a predetermined call sound quality regardless of an actual call situation. It aims to provide a method.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a hands-free call device connected to a communication terminal device that performs a voice call via a communication line, the spoken voice corresponding to a user's spoken voice. A signal processing unit that receives the signal, performs voice signal processing for adjusting speech quality on the speech signal, and transmits the speech signal to the communication terminal device side; and the communication terminal device side A signal level detecting unit for detecting a signal level of a received voice signal corresponding to the received voice of the communication partner received from the signal processing unit based on the signal level of the received voice signal detected by the signal level detecting unit An input for setting an input level adjustment value for adjusting the signal level of the utterance voice signal so that the signal level of the utterance voice signal inputted to the input signal becomes a predetermined input level. A bell adjustment value setting unit, and an input level adjustment unit that adjusts the signal level of the speech signal based on the input level adjustment value set by the input level adjustment value setting unit. An audio signal processing apparatus is provided.
According to the above configuration, the signal level of the received voice signal received from the communication terminal apparatus connected to the voice signal processing apparatus is detected by the signal level detection unit. The input level adjustment value setting unit is configured so that the signal level of the utterance voice signal input to the signal processing unit becomes a predetermined input level based on the signal level of the received voice signal detected by the signal level detection unit. An input level adjustment value for adjusting the signal level of the audio signal is set. Then, the input level adjustment unit adjusts the signal level of the speech signal based on the input level adjustment value set by the input level adjustment value setting unit.
Therefore, the actual communication such as the carrier and model of the communication terminal device connected to the voice signal processing device, the carrier and model of the communication terminal device on the communication partner side, the utterance volume of the communication partner, the vehicle type equipped with the voice processing device, etc. Even when the signal level of the received voice signal varies depending on the situation, the signal level of the speech voice signal input to the signal processing unit and the signal level of the echo component and noise component are the predetermined input levels assumed at the time of design. Can be adjusted as follows. For this reason, the performance of the signal processing unit can be sufficiently exerted regardless of the call situation, and a predetermined call sound quality designed in advance can be maintained.

According to a second aspect of the present invention, in the first aspect, the signal level of the received voice signal is adjusted so that the signal level of the received voice signal detected by the signal level detection unit becomes a predetermined output level. An output level adjustment value setting unit for setting an output level adjustment value for output, and an output level adjustment unit for adjusting the signal level of the received voice signal based on the output level adjustment value set by the output level adjustment value setting unit And.
According to the above configuration, even when the signal level of the received voice signal received from the communication terminal connected to the voice signal processing device fluctuates, the signal level of the received voice signal is set to the predetermined level by the output level adjustment value setting unit. The output level adjustment value for adjusting the signal level of the received voice signal is set so that the output level becomes the following output level. Then, based on the output level adjustment value set by the output level adjustment value setting unit, the output level adjustment unit adjusts the signal level of the received voice signal. Therefore, when the received voice is output based on the received voice signal, the signal level of the echo component at the time of sound collection even if the received voice is output as an echo component together with the user's uttered voice. Can be adjusted. When this echo component is input to the signal processing unit together with the speech signal, the input level adjustment unit adjusts the echo component to a predetermined input level. In this manner, the signal level of the echo component input to the signal processing unit can be adjusted to a signal level assumed in advance at the time of design. For this reason, it is possible to maintain the predetermined speech quality designed in advance by fully exhibiting the performance of the signal processing unit regardless of the call status.

According to a third aspect of the present invention, in the first aspect or the second aspect, the digital reception voice signal output from the communication terminal device side is converted into an analog reception voice signal; A reception voice signal output unit that outputs an analog reception voice signal output from the D / A conversion unit to a speaker, and the signal level detection unit is connected to the reception voice signal output unit from the D / A conversion unit. And detecting a signal level of an analog reception voice signal to be output.
According to the above configuration, the signal level detection unit can detect the signal level of the received voice signal converted from digital to analog in the D / A (Digital / Analog) conversion unit. Thereby, it is sufficient that the signal level of the analog audio signal can be detected, and the circuit configuration can be simplified. Further, since the D / A converter is provided for outputting an analog audio signal to the speaker, it is not necessary to provide the D / A converter only for the purpose of detecting the signal level, and thus can be easily realized. .

According to a fourth aspect of the present invention, in the third aspect, the received voice signal output unit includes a volume adjusting unit for adjusting a volume when the received voice signal is output through a speaker. The input level adjustment value setting unit is connected to the signal processing unit based on the signal level of the analog reception voice signal detected by the signal level detection unit and the volume of the reception voice signal adjusted by the reception volume adjustment unit. The input level adjustment value is set so that the signal level of the input speech signal is the predetermined input level.
According to the above configuration, the input level adjustment value setting unit is a signal level detection unit when the user or the like adjusts the volume of the received voice that is output through the speaker according to the actual call situation such as noisy surroundings. Based on the signal level of the received voice signal detected by the volume adjusting unit and the volume of the received voice signal adjusted by the volume adjusting unit, the signal level of the spoken voice signal input to the signal processing unit is a predetermined input assumed at the time of design. Set the input level adjustment value so that it becomes level. Then, based on the input level adjustment value set by the input level adjustment value setting unit, the input level adjustment unit adjusts the signal level of the speech audio signal. Further, even when noise is collected by the input level adjustment unit, the signal level of the noise component can be adjusted together with the speech signal. Therefore, the signal level of the speech signal input to the signal processing unit and the signal level of the echo component and the noise component can be adjusted so as to be a predetermined input level assumed at the time of design. Therefore, if a hands-free call device is configured using this audio signal processing device, it is possible to maintain a predetermined call sound quality designed in advance regardless of the call state.

According to a fifth aspect of the present invention, in the aspect according to any one of the first to fourth aspects, the signal processing unit may perform preset echo cancellation as the voice signal processing on the speech voice signal. Echo cancellation processing for removing an echo component included in the speech audio signal is performed using a parameter value for use.
According to the above configuration, when the signal processing unit performs echo cancellation processing for removing the echo component included in the utterance voice signal, the echo cancellation preset at the time of design or the like is performed on the utterance voice signal. Even when the parameter value is used, it is possible to input the utterance voice signal to the signal processing unit by adjusting the signal level so that it becomes a predetermined input level assumed at the time of design. Therefore, if a hands-free call device is configured using this audio signal processing device, a predetermined call sound quality can be maintained regardless of the actual call situation.

According to a sixth aspect of the present invention, in the aspect according to any one of the first to fifth aspects, the signal processing unit is configured to perform noise reduction set in advance as the audio signal processing for the speech audio signal. Noise reduction processing for removing a noise component included in the utterance voice signal is performed using a parameter value for the above.
According to the above configuration, when performing noise reduction processing for removing the noise component included in the utterance voice signal with respect to the utterance voice signal, the parameter value for noise reduction set in advance at the time of design or the like is used. Even in such a case, it is possible to input the utterance voice signal by adjusting the signal level so as to be a predetermined input level assumed at the time of design. Therefore, if a hands-free call device is configured using this audio signal processing device, a predetermined call sound quality can be maintained regardless of the actual call situation.

In order to achieve the above object, according to a seventh aspect of the present invention, there is provided a hands-free communication device including the voice signal processing device according to any one of the first to sixth aspects. The signal processing unit receives an utterance voice signal corresponding to a user's utterance voice picked up in a vehicle equipped with the hands-free call device, and receives a reception voice signal output from the communication terminal device side. Provides a hands-free call device characterized in that sound is output through a speaker arranged in the vehicle.
According to the above configuration, when the hands-free call device is mounted in the vehicle and a call is made in the vehicle, the received voice signal input from the communication terminal device side connected to the hands-free call device according to the call state Even when the signal level fluctuates, the signal processing unit can input the uttered voice signal by adjusting the signal level so as to be a predetermined input level assumed at the time of design. For this reason, the signal processing unit can perform voice signal processing for adjusting the speech quality on the digital utterance voice signal adjusted to a predetermined signal level. Thereby, it is possible to maintain a predetermined call sound quality regardless of the call situation.

In order to achieve the above object, an eighth aspect of the present invention is connected to a communication terminal device that performs a voice call via a communication line, and an utterance voice signal corresponding to a user's utterance voice is input, A speech signal processing for adjusting speech quality is performed on the speech signal, and a signal processing unit that transmits the speech signal to the communication terminal device side, and a communication partner received from the communication terminal device side In the control method of the audio signal processing device for controlling the audio signal processing device, comprising: a signal level detection unit that detects a signal level of the received audio signal corresponding to the received audio; the communication received from the communication terminal device side Based on the process of detecting the signal level of the received voice signal corresponding to the received voice of the other party, and the signal level of the received voice signal detected by the signal level detecting unit, the signal A process of setting an input level adjustment value for adjusting the signal level of the utterance voice signal so that the signal level of the utterance voice signal input to the processing section becomes a predetermined input level; and the adjustment value setting section And a step of adjusting the signal level of the speech signal based on the input level adjustment value set in step (1).
According to the above configuration, since the configuration substantially similar to that of the first aspect of the present invention is provided, the operation and effect substantially similar to those of the first aspect of the present invention are exhibited.

  According to the present invention, the performance of the signal processing unit can be sufficiently exhibited regardless of the actual call situation, and the predetermined call sound quality assumed at the time of design can be maintained.

It is a figure which shows the aspect of use of the vehicle equipment (audio | voice signal processing apparatus, hands-free call apparatus) which concerns on embodiment of this invention. It is a block diagram which shows the functional structure of vehicle equipment. It is a flowchart which shows operation | movement of vehicle equipment.

Embodiments of an audio signal processing device and a hands-free call device according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the audio signal processing device and the hands-free communication device according to the present embodiment will be described by taking as an example an apparatus configured as an in-vehicle device 10 mounted on a vehicle 100 such as an automobile. The in-vehicle device 10 is connected to a mobile phone 20 (communication terminal device) owned by a driver or a passenger who drives the vehicle 100. The in-vehicle device 10 and the mobile phone 20 communicate according to a predetermined communication protocol.

  Audio signals can be transmitted and received between the in-vehicle device 10 and the mobile phone 20 by wireless communication using, for example, Bluetooth (registered trademark, the same applies hereinafter), which is one of short-range wireless communication. By transmitting and receiving audio signals between the in-vehicle device 10 and the mobile phone 20, the in-vehicle device 10 controls the hands-free call so that the mobile phone can make a call in a hands-free manner. Note that a configuration using a wireless LAN as short-range wireless communication may be used, and not limited to wireless communication, but may be wired communication. In the present embodiment, the following description will be made assuming that wireless communication is performed.

  FIG. 2 is a block diagram showing a functional configuration of the in-vehicle device 10 together with the mobile phone 20. The mobile phone 20 receives or transmits a mobile terminal carrier with a base station (not shown) via a mobile communication network (communication line) (not shown), and performs call communication with other mobile terminals and landline phones. In addition, the mobile phone 20 includes a general mobile phone 20 such as a built-in loudspeaker, a built-in microphone, a communication unit for telephone communication, and a communication terminal for voice communication and data communication. A communication module for short-range wireless communication (for example, a Bluetooth module) (not shown) for short-range wireless communication is provided.

  On the other hand, the in-vehicle device 10 is connected to the sound collection device 30 and the speaker 40 arranged in the vehicle 100, and as shown in FIG. A voice signal input unit 12 that receives an analog voice signal (speech voice signal) corresponding to a user's voice collected by the sound pickup device 30, and a user's voice inputted from the voice signal input unit 12 A PCM codec 13 that converts an analog voice signal to be converted into a digital voice signal, and also converts a digital voice signal corresponding to the received voice received from the mobile phone 20 via the communication I / F unit 11 into an analog voice signal; 13 is a voice signal output unit (received voice signal) for outputting an analog voice signal corresponding to the received voice converted in 13 to the speaker 40. 14), a hands-free engine (signal processing unit) 15 that performs voice signal processing for adjusting the voice quality during hands-free calling on these voice signals, and the PCM codec 13 to the voice signal output unit 14 A signal level detector 16 that detects the signal level of an analog voice signal (received voice signal) corresponding to the received voice that is output to the receiver, and a control unit 17 (input level adjustment value setting unit, output level adjustment value setting) that controls the signal level Part).

  The communication I / F unit 11 is a communication connection unit for performing short-distance wireless communication with the mobile phone 20 in the vehicle 100 according to a predetermined communication protocol under the control of the control unit 17. If the incoming call trigger signal is received, the digital signal corresponding to the received voice transmitted from the mobile phone 20 is received and output to the hands-free engine 15. In addition, a digital audio signal corresponding to the user's uttered voice output from the hands-free engine 15 is transmitted to the mobile phone 20.

  The sound collection device 30 is a stationary microphone disposed in the vehicle 100, and is configured using a small omnidirectional microphone. The sound collection device 30 converts voice uttered by a user (driver or passenger) into an analog voice signal and outputs the voice signal to the voice signal input unit 12.

  The audio signal input unit 12 is connected to the control unit 17 via a control line (not shown) and operates under the control of the control unit 17. The audio signal input unit 12 includes a microphone amplifier 12 a configured by a gain adjustment circuit or the like, amplifies the audio signal output from the sound collection device 30 according to a preset microphone gain, and outputs the amplified signal to the PCM codec 13. The microphone gain value is set in advance according to the vehicle type on which the in-vehicle device 10 is mounted.

The PCM codec 13 includes a conversion unit 13a, an input level adjustment unit 13b, and an output level adjustment unit 13c.
An analog audio signal corresponding to the user's uttered voice is input from the audio signal input unit 12 to the conversion unit 13a via the input level adjustment unit 13b. The conversion unit 13 a has a function of performing A / D conversion processing for converting the analog audio signal input from the input level adjustment unit 13 b into a digital audio signal, and outputting the converted digital audio signal to the hands-free engine 15. . Further, a digital audio signal corresponding to the received voice received by the mobile phone 20 is input from the hands-free engine 15 to the conversion unit 13a. The conversion unit 13a performs D / A conversion processing for converting the digital audio signal input from the hands-free engine 15 into an analog audio signal, and outputs the converted analog audio signal to the output level adjustment unit 13c. That is, the conversion unit 13a includes a functional unit that performs A / D conversion processing and a functional unit that performs D / A conversion processing, and corresponds to the D / A conversion unit of the present application because it performs D / A conversion.

  The input level adjustment unit 13b is a digital audio signal (speech) corresponding to the user's utterance voice input to the hands-free engine 15 based on an input level adjustment value appropriately set by the control unit 17 according to the call state or the like. The audio signal is adjusted so that the signal level becomes a predetermined input level. In the present embodiment, the conversion is performed by adjusting the signal level of the analog voice signal corresponding to the user's uttered voice input from the voice signal input unit 12 based on the input level adjustment value set by the control unit 17. The signal level of the digital audio signal corresponding to the user's speech input to the handsfree engine 15 from the unit 13a is adjusted. The input level adjustment unit 13b includes, for example, a variable amplification circuit that amplifies an audio signal input from the audio signal input unit 12 based on a gain (amplification factor) that is appropriately set by the control unit 17 according to a call situation or the like. Can be configured.

  The output level adjustment unit 13c is an analog voice corresponding to the received voice output from the PCM codec 13 to the voice signal output unit 14 based on the output level adjustment value appropriately set by the control unit 17 according to the call state or the like. The signal (received voice signal) is adjusted so that the signal level becomes a predetermined output level. In the present embodiment, the signal level of the analog voice signal corresponding to the received voice output from the conversion unit 13a is adjusted. The output level adjustment unit 13c uses, for example, a variable amplification circuit that amplifies the analog audio signal output from the conversion unit 13a based on a gain (amplification factor) appropriately set according to the call state or the like by the control unit 17. Can be configured.

The audio signal output unit 14 is connected to the control unit 17 via a control line (not shown). Under the control of the control unit 17, an analog audio signal corresponding to the received voice output from the PCM codec 13 is input to the vehicle 100. Is output to one or a plurality of speakers 40 installed in the.
The audio signal output unit 14 includes an electronic volume 14a (volume adjustment unit) and a power amplifier 14b. The electronic volume 14a includes an operator not shown. The user can perform a volume adjustment operation for adjusting the volume of the received voice that is output into the vehicle via the speaker 40 via this operator. The electronic volume 14a adjusts the volume of the received analog audio signal output from the PCM codec 13 according to the user's volume adjustment operation, and outputs it to the power amplifier 14b. The power amplifier 14b amplifies an analog audio signal corresponding to the received voice after the volume is adjusted in the electronic volume 14a with a preset gain, and outputs the amplified signal to the speaker 40. This gain value is set in advance according to the vehicle type on which the in-vehicle device 10 is mounted.
The speaker 40 is a speaker that converts an audio signal into a sound wave, and one or a plurality of speakers 40 are installed in the vehicle 100 on which the in-vehicle device 10 is mounted.

Under the control of the control unit 17, the hands-free engine 15 performs a predetermined process on a digital audio signal corresponding to the user's uttered voice input from the sound collection device 30 via the audio signal input unit 12 and the PCM codec 13. In accordance with the voice processing program, voice signal processing for adjusting the call sound quality to a predetermined state is performed.
Specifically, the hands-free engine 15 includes a so-called echo canceller device or a noise reduction device, and the received voice output through the audio signal output unit 14 and the speaker 40 is collected by the sound collecting device 30 or the vehicle. A signal for removing or reducing echo components or noise components included in the audio signal by collecting 100 running sounds (engine noise, road noise, wind noise, etc.), air conditioning sound of the air conditioner, etc. Processing (audio signal processing) is performed on the audio signal. When performing signal processing on the audio signal, the hands-free engine 15 performs echo cancellation processing and noise reduction processing using the parameter values for echo cancellation and noise reduction set by the control unit 17. .

  The signal level detection unit 16 detects the signal level of the analog voice signal corresponding to the received voice output from the PCM codec 13 to the voice signal output unit 14 and outputs the detection signal to the control unit 17. In the present embodiment, the signal level detection unit 16 is connected to an audio signal output line connecting the output level adjustment unit 13c and the electronic volume 14a, and an analog corresponding to the received voice output from the output level adjustment unit 13c. The signal level of the audio signal is detected.

  The control unit 17 includes a CPU (not shown), a RAM (not shown) that functions as a work area of the CPU, and a storage device 17a such as a ROM that stores various control programs executed by the CPU in a nonvolatile manner. Yes. In the storage device 17a such as a ROM, in addition to various control programs, the parameter information and the signal level of the audio signal input from the audio signal input unit 12 in the input level adjustment unit 13b provided in the PCM codec 13 are adjusted. When determining whether or not the signal level needs to be adjusted when the output level adjustment unit 13c adjusts the input level information to be referred to or the signal level of the audio signal output from the PCM codec 13 to the audio signal output unit 14. The output level information to be referred to is stored. Further, when an input level adjustment value and an output level adjustment value are set according to a setting operation described later, these input level adjustment value and output level value are also stored in the storage device 17a.

The parameter information includes parameter values for echo cancellation and noise reduction used when the hands-free engine 15 performs audio signal processing such as echo cancellation processing and noise reduction processing on a digital audio signal corresponding to the user's speech. Information about parameter values.
In the parameter information, according to the carrier or model of the mobile phone 20 that is connected for communication, a parameter value that optimizes call quality is set in advance and associated for each vehicle type of the vehicle 100 in which the in-vehicle device 10 is installed. It has been. The parameter values set by the user may be set by the user, and the parameter values set by the user may be stored in the storage device 17a as parameter information.

  The input level information is a user's utterance to be input to the hands-free engine 15 for each vehicle type of the vehicle 100 in which the in-vehicle device 10 is installed, according to the carrier or model of the mobile phone 20 that is communicatively connected to the in-vehicle device 10. This is information relating to the signal level of a digital audio signal corresponding to audio. In the present embodiment, as the input level information, specifically, whether the signal level of the analog audio signal corresponding to the user's speech input from the audio signal input unit 12 to the PCM codec 13 is a predetermined signal level. Information on the signal level that is a reference value for determining whether or not is included is included. Whether the control unit 17 needs to adjust the signal level of the analog audio signal corresponding to the user's speech input from the audio signal input unit 12 to the PCM codec 13 based on the information about the signal level serving as the reference value. And an input level adjustment value to be described later can be set.

  Similarly, the output level information is a communication to be output from the PCM codec 13 for each vehicle type of the vehicle 100 in which the in-vehicle device 10 is installed, according to the carrier or model of the mobile phone 20 that is communicably connected to the in-vehicle device 10. This is information relating to the signal level of an analog voice signal corresponding to the received voice from the other party. In the present embodiment, as the output level information, specifically, the signal level of the analog audio signal corresponding to the received voice from the communication partner output from the PCM codec 13 to the audio signal output unit 14 is within a predetermined signal level range. Information on a signal level that is a reference value for determining whether or not the signal is within the range is included. The control unit 17 needs to adjust the signal level of the analog audio signal corresponding to the received voice from the communication partner that is output from the PCM codec 13 to the audio signal output unit 14 based on the information related to the signal level serving as the reference value. And an output level adjustment value to be described later can be set.

Next, various setting operations related to the audio signal processing of the hands-free engine 15 in the in-vehicle device 10 of the present embodiment will be described. The flowchart shown in FIG. 3 shows various parameter settings, input level adjustment values, and output level adjustment value settings when the hands-free engine 15 performs audio signal processing on a digital audio signal corresponding to a user's speech. This shows the setting operation.
First, when the hands-free communication device is turned on (step S1; Y), the control unit 17 refers to the parameter information stored in the storage device 17a (step S2), and performs echo cancellation in the hands-free engine 15. Parameter values for performing audio signal processing such as processing and noise reduction processing are set (step S3). At this time, if the parameter value set by the user is stored in the storage device 17a, the parameter value set by the user is set as the parameter value used when the hands-free engine 15 performs the audio signal processing. .

  Next, it is determined whether or not the signal level adjustment values of the input level adjustment value and the output level adjustment value are already set (step S4). When the signal level value of the input level value or the output level value has already been set (step S4; Y), the control unit 17 follows the input level adjustment value or the output level adjustment value stored in the storage device 17a. The input level adjustment unit 13b and the output level adjustment unit 13c are set so as to adjust the signal level. For example, when the input level adjustment unit 13b is configured using a variable amplifier circuit, the control unit 17 reads a gain as an input level adjustment value stored in the storage device 17a, and uses this gain as an audio signal input unit. 12, the analog audio signal input to the PCM codec 13 is amplified to adjust the signal level, and the input level adjustment unit 13 b is set so that the analog audio signal of a predetermined input level is input to the PCM codec 13. I do. Similarly, when the output level adjustment unit 13c is configured using a variable amplifier circuit, the control unit 17 reads a gain as an output level adjustment value stored in the storage device 17a, and uses this gain from the PCM codec 13. The output of the output level adjusting unit 13c is such that the analog audio signal corresponding to the received voice to be output is amplified, the signal level is adjusted, and the analog audio signal of a predetermined output level is output to the audio signal output unit 14. Set up.

On the other hand, when it is determined that the input level adjustment value and the output level adjustment value are not yet set (step S4; N), the process proceeds to step S6. In step S5, the input level adjustment unit 13b and the output level adjustment unit 13c set the input level adjustment value and the output level adjustment value, respectively (step S5). It waits until there is an incoming call to the connected mobile phone 20 (step S6).
When the control unit 17 receives the incoming trigger signal and determines that the mobile phone 20 has received an incoming call (step S6; Y), the signal level detection unit 16 causes the analog voice signal corresponding to the received voice of the communication partner to be received. The signal level is detected (step S7).

  Next, based on the signal level of the analog voice signal corresponding to the received voice of the communication partner detected in step S7, the control unit 17 causes the input level adjustment unit 13b and the output level adjustment unit 13c to each of the PCM codecs 13. It is determined whether or not it is necessary to adjust the signal level of the input / output analog audio signal (step S8). If it is determined in step S8 that the signal level needs to be adjusted, the control unit 17 refers to the input level information and the output level information stored in the storage device 17a, respectively, and determines the input level adjustment value and the output level adjustment value. (Re) set respectively, and based on these input adjustment value and output level adjustment value, the input level adjustment unit 13b and the output level adjustment unit 13c are set so as to adjust the signal level of the analog audio signal, respectively (step) S9).

In step S9, specifically, the control unit 17 refers to the input level information, and determines the difference between the signal level of the analog voice signal corresponding to the received voice detected in step S7 and the signal level serving as the reference value. Based on this, an input level adjustment value for adjusting the signal level of the analog audio signal corresponding to the user's uttered voice input from the audio signal input unit 12 to the PCM codec 13 is set in the input level adjustment unit 13b. As a result, the signal level of the digital audio signal corresponding to the user's speech input to the hands-free engine 15 becomes a predetermined input level.
Similarly, the control unit 17 refers to the output level information, and the communication input from the PCM codec 13 to the audio signal output unit 14 based on the signal level of the analog audio signal corresponding to the received voice detected in step S7. Based on the difference between the signal level of the analog voice signal corresponding to the other party's received voice and the signal level serving as the reference value, the signal level of the analog voice signal corresponding to the user's voice is adjusted by the output level adjusting unit 13c. Set the output level adjustment value.

  According to the above-described embodiment, the signal level detection unit 16 detects the signal level of the analog voice signal corresponding to the received voice of the communication partner received from the mobile phone 20 connected to the in-vehicle device 10. Based on the signal level of the analog voice signal corresponding to the received voice of the communication partner detected by the signal level detection unit 16, the control unit 17 performs digital processing corresponding to the user's uttered voice input to the handsfree engine 15. With reference to the input level information, an input level adjustment value for adjusting the signal level of the analog voice signal corresponding to the user's uttered voice is set so that the signal level of the voice signal becomes a predetermined input level. Then, the input level adjustment unit 13 b adjusts the signal level of the analog voice signal corresponding to the user's uttered voice input from the voice signal input unit 12 based on the input level adjustment value set by the control unit 17. Therefore, in the present embodiment, the carrier and model of the mobile phone 20 connected to the in-vehicle device 10, the carrier and model of the mobile phone of the communication partner, the vehicle type in which the in-vehicle device 10 is mounted, and the sound collection in the vehicle 100 Even if the signal level of the analog audio signal corresponding to the received voice output to the audio signal output unit 14 varies according to the actual call situation such as the positional relationship between the device 30 and the speaker 40 and the running state, the input level The adjustment unit 13b can adjust the signal level of the digital audio signal corresponding to the user's uttered voice input to the hands-free engine 15 to a predetermined input level assumed at the time of design. Therefore, according to the in-vehicle device 10, the handsfree engine 15 can always be input with a digital audio signal adjusted to a predetermined input level regardless of the actual call situation. The performance can be fully exhibited and a predetermined speech quality designed in advance can be maintained.

  Further, according to the above embodiment, the control unit 17 is detected by the signal level detection unit 16 even when the signal level of the analog audio signal corresponding to the received voice of the communication partner received from the mobile phone 20 side fluctuates. Based on the signal level of the analog voice signal corresponding to the received voice of the communication partner, the signal level of the analog voice signal corresponding to the received voice of the communication partner input from the PCM codec 13 to the voice signal output unit 14 is a predetermined output. The output level adjustment value for adjusting the signal level of the analog voice signal corresponding to the received voice from the communication partner is set with reference to the output level information so as to be the level. Based on the output level adjustment value, the output level adjustment unit 13c adjusts the signal level of the analog audio signal corresponding to the received voice. Therefore, when the received voice is output through the speaker 40, the signal level of the echo component at the time of sound collection is adjusted even when the received voice is collected as an echo component together with the user's uttered voice. Can do. When this echo component is input to the handsfree engine 15 together with the user's uttered voice, it is adjusted to a predetermined input level by the input level adjusting unit 13b. Thus, the signal level of the echo component input to the hands-free engine 15 can be adjusted to the signal level assumed in advance at the time of design. Therefore, according to the in-vehicle device 10, the handsfree engine 15 performs the audio signal processing on the digital audio signal corresponding to the uttered voice whose signal level is adjusted to the predetermined input level, regardless of the call situation. It is possible to maintain a predetermined speech quality designed in advance.

  Further, according to the above embodiment, when the hands-free engine 15 performs the echo cancellation processing for removing the echo component included in the audio signal on the digital audio signal corresponding to the user's speech. Even when a parameter value for echo cancellation set in advance at the time of design or the like is used, the hands-free engine 15 receives a digital audio signal whose signal level is adjusted so as to be a predetermined input level assumed at the time of design. Can be entered. Similarly, according to the above-described embodiment, when the hands-free engine 15 performs a noise reduction process for removing a noise component included in the audio signal on the digital audio signal corresponding to the user's uttered voice. In addition, even when a noise reduction parameter value set in advance at the time of design or the like is used, the hands-free engine 15 has a digital audio signal whose signal level is adjusted so as to be a predetermined input level assumed at the time of design. Can be entered. For this reason, according to the in-vehicle device 10, it is possible to remove the echo component to the extent assumed at the time of design or reduce the noise component to maintain a predetermined call sound quality regardless of the actual call situation. In the present embodiment, since the signal level of the analog audio signal converted into the analog signal by the conversion unit 13a is detected, the circuit configuration can be simplified. Further, the configuration for detecting the signal level of the analog audio signal output to the speaker 40 can be easily realized.

However, the above-described embodiment described above is one aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, in accordance with the signal level of the analog voice signal corresponding to the received voice detected by the signal level detection unit 16, the control unit 17 displays the input level information and output level information stored in the storage device 17a. With reference to the configuration in which the input level adjustment value and the output level adjustment value are respectively set, the volume adjusted in the electronic volume 14a may be further referred to when setting the input level adjustment value and the output level adjustment value. . That is, when the user adjusts the volume of the reception voice of the communication partner that is output through the speaker 40, the control unit 17 is adjusted in the electronic volume 14a together with the signal level detected by the signal level detection unit 16. Based on the volume of the analog voice signal corresponding to the received voice, the input level is set so that the signal level of the digital voice signal corresponding to the uttered voice input to the hands-free engine 15 becomes the predetermined input level assumed at the time of design. The level adjustment value may be set. In this way, by setting the input level adjustment value, it is possible to maintain a predetermined call sound quality designed in advance regardless of the actual call situation such as noisy surroundings.

10 In-vehicle equipment (voice signal processing device, hands-free communication device)
12 Audio signal input unit 13 PCM codec 13a Conversion unit (D / A conversion unit)
13b Input level adjustment unit 13c Output level adjustment unit 14 Voice signal output unit (received voice signal output unit)
14a Electronic volume (volume adjuster)
15 Hands-free engine (signal processor)
16 signal level detection unit 17 control unit (input level adjustment value setting unit, output level adjustment value setting unit)
20 Communication terminal device (mobile phone)
30 sound collecting device 40 speaker 100 vehicle

Claims (8)

An audio signal processing device connected to a communication terminal device that performs a voice call via a communication line,
A signal that receives a speech signal corresponding to a user's speech, performs speech signal processing for adjusting the speech quality on the speech signal, and transmits the speech signal to the communication terminal device side A processing unit;
A signal level detection unit for detecting a signal level of a received voice signal corresponding to the received voice of the communication partner received from the communication terminal device side;
Based on the signal level of the received voice signal detected by the signal level detector, the signal level of the uttered voice signal input to the signal processor is set to a predetermined input level. An input level adjustment value setting unit for setting an input level adjustment value for adjusting the signal level;
An input level adjustment unit that adjusts a signal level of the speech signal based on the input level adjustment value set by the input level adjustment value setting unit;
An audio signal processing device comprising: The audio signal processing device according to claim 1,
Output level adjustment value setting for setting an output level adjustment value for adjusting the signal level of the reception voice signal so that the signal level of the reception voice signal detected by the signal level detection unit becomes a predetermined output level And
An output level adjustment unit that adjusts the signal level of the received voice signal based on the output level adjustment value set by the output level adjustment value setting unit;
An audio signal processing device comprising: The audio signal processing device according to claim 1 or 2,
A D / A converter that converts a digital received voice signal output from the communication terminal device side into an analog received voice signal;
A received voice signal output unit that outputs an analog received voice signal output from the D / A converter to a speaker;
With
The signal level detection unit detects a signal level of an analog reception voice signal output from the D / A conversion unit to the reception voice signal output unit;
An audio signal processing device. The audio signal processing device according to claim 3,
The received voice signal output unit includes a volume adjusting unit for adjusting a volume when the received voice signal is output as voice through a speaker;
The input level adjustment value setting unit is based on the signal level of the analog reception voice signal detected by the signal level detection unit and the volume of the reception voice signal adjusted by the reception volume adjustment unit. Setting the input level adjustment value so that the signal level of the utterance voice signal input to the predetermined input level;
An audio signal processing device. In the audio signal processing device according to any one of claims 1 to 4,
The signal processing unit is an echo cancellation process for removing an echo component included in the speech signal by using a preset parameter value for echo cancellation as the speech signal processing for the speech signal. Applying
An audio signal processing device. In the audio signal processing device according to any one of claims 1 to 5,
The signal processing unit performs noise reduction processing for removing a noise component included in the utterance voice signal by using a preset noise reduction parameter value as the voice signal processing for the utterance voice signal. Applying
An audio signal processing device. A hands-free communication device comprising the audio signal processing device according to any one of claims 1 to 6,
The signal processing unit receives an utterance voice signal corresponding to the user's utterance voice collected in the vehicle equipped with the handsfree call device,
The received voice signal output from the communication terminal device side is output as voice via a speaker disposed in the vehicle;
Hands-free call device characterized by Connected to a communication terminal device that performs a voice call via a communication line, an utterance voice signal corresponding to a user's utterance voice is input, and voice signal processing for adjusting the voice quality of the utterance voice signal is performed. And a signal processing unit for transmitting the uttered voice signal to the communication terminal device side, and a signal level detecting unit for detecting the signal level of the received voice signal corresponding to the received voice of the communication partner received from the communication terminal device side. And a method for controlling an audio signal processing device for controlling an audio signal processing device comprising:
Detecting the signal level of the received voice signal corresponding to the received voice of the communication partner received from the communication terminal device side;
Based on the signal level of the received voice signal detected by the signal level detector, the signal level of the uttered voice signal input to the signal processor is set to a predetermined input level. A process of setting an input level adjustment value for adjusting the signal level;
Adjusting the signal level of the speech signal based on the input level adjustment value set by the adjustment value setting unit;
A method for controlling an audio signal processing apparatus comprising: