JP2004128751A - Hands-free speech device and program for hands-free speech - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hands-free speech device in which optimum echo cancellation is realized by registering various setting values for echo cancellation beforehand, and by enabling a user to arbitrarily or automatically execute the echo cancellation on the basis of the setting values, and also to provide a program for hands-free speech. <P>SOLUTION: A telephone communication control unit 9 and an acoustic control unit 40 are connected to a navigation system. A portable telephone 8 is provided connectably to the telephone communication control unit 9. A microphone 51 to input transmission voices to the portable telephone 8, and a speaker 50 to output reception voices from the portable telephone 8 are connected to the acoustic control part 40. An echo cancellation part 31 to cancel echoes in the transmission voices and the reception voices, a flash memory 34 to register the setting values for the echo cancellation corresponding to the type of the portable telephone 8, and a CPU 32 to select the setting values as the reference for the echo cancellation, are provided to the telephone communication control unit 9. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hands-free call device and a hands-free call program capable of canceling generated echo based on a set value when making a call with a handset such as a mobile phone hands-free.
[0002]
[Prior art]
2. Description of the Related Art In recent years, mobile communication devices such as mobile phones and PHSs have become very popular, and various related devices have been developed to assist the calls. In particular, a so-called hands-free communication device including a speaker and a microphone (microphone) has been developed and is becoming popular as a device for enabling a telephone call or the like to be safely performed in a car. With this hands-free communication device, when a mobile phone is set, a user can talk by inputting a transmission voice from a microphone while listening to a reception voice from a speaker without holding the mobile phone. .
[0003]
By the way, when such a hands-free communication device is used in a relatively narrow space such as a vehicle interior, a phenomenon in which a part of the reception sound converted from electric to voice through a speaker is transferred to a microphone and converted into sound to electric, that is, Acoustic echo is likely to occur. When such an echo occurs, the received sound deteriorates and it becomes difficult to hear. When the echo component increases, a state close to so-called howling may occur. Also, there is a problem of a line echo in which a delay generated in the middle of the line returns as an echo due to a hybrid impedance match or the like.
[0004]
In order to cope with this, a general hands-free communication device is provided with an echo canceller for suppressing and reducing such echo. An example of a hands-free communication device having such an echo canceller is shown in a block diagram of FIG. That is, in FIG. 11, 1 is an echo canceling unit, 2 is a navigation system, 3 is a CPU for communicating with the navigation system 3 and controlling the echo canceling unit 1, 4 is an SRAM (Static RAM) which is a work area of the system, Reference numeral 5 denotes a flash memory as a program storage area, 6 denotes a speaker, 7 denotes a microphone, and 8 denotes a mobile phone. In such a hands-free communication device, when the navigation system is activated or when the device is reset, an initial setting value is input from the navigation system. These initial setting values include setting values for echo cancellation. The echo canceling unit 1 cancels the echo based on the set value.
[0005]
By the way, there are various methods of echo cancellation, and as an example, there is the following (for example, see Patent Document 1). That is, the adaptive signal processing unit generates a signal corresponding to the echo component in a pseudo manner based on the reception signal, and subtracts the generated echo component from the input signal by the adder (subtractor). The echo component is generated as a sum signal obtained by sequentially delaying the received signal in a stepwise manner and multiplying each delayed signal by a corresponding coefficient. Further, in the related art, a sound volume adjustment unit and a frequency characteristic adjustment unit that adjusts a sound volume and a frequency characteristic according to an output from a vehicle speed sensor or an acceleration sensor so that noise of an output sound is suppressed and a sound volume is optimized. In addition, the sound volume and frequency characteristics can be adjusted by the sound volume adjustment unit and the frequency characteristic adjustment unit so that the residual echo component after the echo cancellation processing is minimized.
[0006]
Next, FIG. 12 shows an example in which the echo canceling means is configured in an in-vehicle information terminal connected to a sound source other than a telephone (for example, a radio, a CD player, an MD player, a DVD player, a television, a navigation device, and the like). . That is, the in-vehicle information terminal 101 includes a buffer (Buffer) 103, an attenuator circuit (ATT) 104, a CODEC 105, a digital signal processor (DSP) 106, and a CODEC 107 as circuits for processing audio input from the microphone 102. ATT 108 and Buffer 109 are provided as a circuit for outputting voice to a mobile phone terminal 110 such as a mobile phone, and a buffer 111 and ATT 112 are provided as a circuit for receiving voice from the mobile phone terminal 110, and voice is output to a speaker 115. A volume (Volume) 113 and an amplifier (Amp.) 114 are provided as a circuit for performing the operation.
[0007]
Further, the in-vehicle information terminal 101 includes a CPU 116 for controlling the DSP 106 and the like, an operation key (Key) 117 for the user to adjust the volume and the like, and the CPU 116, the volume 113, the DSP 106 and the operation key 117. Are connected by control signal lines 118 to 120.
[0008]
The operation of the in-vehicle information terminal 101 as described above will be described. That is, the voice input from the microphone 102 is taken into the ATT 104 via the buffer 103. At this time, the gain of the ATT 104 is a fixed value adjusted at the development stage. The output of the ATT 104 is converted from an analog signal to a digital signal by the A / D converter of the CODEC 105 and input to the DSP 106. The DSP 106 compares the microphone audio signal input from the A / D converter of the CODEC 105 with the reception audio signal input from the A / D converter of the CODEC 107, and performs echo cancellation processing.
[0009]
The microphone audio that has been subjected to the echo cancellation processing by the DSP 106 is input as a digital audio signal to the D / A converter of the CODEC 107 and converted into an analog signal. This signal is transmitted to the mobile telephone terminal via the ATT 108 and the buffer 109 as a transmission voice signal. At this time, the gain of the ATT 108 is a fixed value adjusted at the development stage.
[0010]
Next, the received voice signal input from the mobile telephone terminal 110 is input to the CODEC 107 via the buffer 111 and the ATT 112. At this time, the gain of the ATT 112 is a fixed value adjusted at the development stage. The output of the ATT 112 is converted from an analog signal to a digital signal by the A / D converter of the CODEC 107 and input to the DSP 106. This signal is used by the DSP 106 for echo cancellation processing, and is input as a digital audio signal to the D / A converter of the CODEC 105 and converted into an analog signal. The gain of the audio signal converted into the analog signal is determined by the volume 113 in accordance with the input operation of the operation key 117 by the user, and is input to the amplifier 114. The output signal of the amplifier 114 is input to an externally connected speaker 115, and a received voice is output from the speaker 115.
[0011]
When the user operates the operation keys 117 to change the gain of the volume 113, the signal is detected by the CPU 116 and the volume 113 is controlled according to a predetermined setting. Further, in order to normally operate the DSP 106 in advance, control such as initial setting is performed by the CPU 116.
[0012]
In the in-vehicle information terminal 101 described above, the gains of the ATTs 104, 108, and 112, the echo cancellation processing parameters in the DSP 106, and the like are fixed values adjusted at the development stage. The function that can be operated by the user is only the operation of the volume 113 for increasing or decreasing the output sound level from the speaker 115.
[0013]
[Patent Document 1]
JP-A-7-321729
[0014]
[Problems to be solved by the invention]
The echo component generated during a hands-free call differs greatly depending on the type of mobile phone used by both parties (near-end talker, far-end talker) and the time and place of use. For example, when the far-end speaker is fixed to the land of a fixed station (ordinary ordinary line), the mobile phones used by the near-end speaker are changed to a company d, a company, J company, T company and a carrier ( When a call is made by changing to a different mobile phone service provider), the receiving volume of the near end speaker becomes larger when using the mobile phone of company a, based on company d, A phenomenon occurs in which the size is smaller when mobile phones of companies J and T are used. In particular, there is a model in which the reception voice level of the mobile telephone terminal 110 connected to the above-mentioned in-vehicle information terminal differs by about 20 dB depending on the type of telephone.
[0015]
Also, on a Friday night or the like, the lines are crowded and the communication rate falls to a half rate, thereby deteriorating the call sound quality. This is also true of the distance between the two parties. If the distance is too large, the sound quality will deteriorate while passing through the base station, and the echo may be severe. Furthermore, even when the near-end speaker is in the car, the environment inside the vehicle is completely different between when the vehicle is stopped and when the vehicle is running. For example, if the mobile phone of company d is the optimal setting while the vehicle is stopped, the echo will increase if a mobile phone of another manufacturer is used. Could be
[0016]
Other examples of factors that may affect the difference in the echo canceling effect, including the volume, include the difference in the telephone type of the far end talker, the difference in the size of the vehicle, and the utterance in the vehicle. Difference in the volume generated by the other party (affects the echo canceling effect including the reception volume of the other party's telephone).
[0017]
However, in the above-described related art, various setting values for performing the echo cancellation are often fixed in advance. The set values include, for example, a delay time for generating a pseudo echo component, a coefficient by which each delay signal is multiplied, and the like. It was set to the optimal value when applied to the land of a fixed station. For this reason, if the use conditions are different, as in the case of using a mobile phone of another company, there is a possibility that the echo will increase or the sound quality will deteriorate. In the communication device disclosed in Patent Literature 1, an optimal signal is generated by performing successive corrections using various algorithms based on the residual echo components after the echo cancellation processing. If the reference value for echo cancellation is fixed, it is not always possible to generate an optimal signal according to each company.
[0018]
Further, in the in-vehicle information terminal 101 provided with the above-described echo canceling means, a sound source other than the telephone is used as a sound source of the sound output from the speaker 115. In some cases, an appropriate setting value of the volume 113 is largely different. However, since the volume is controlled only by the volume 113, if the reception volume is lower than that of the other sound sources, if the reception volume is increased, the volume of the other sound sources becomes unnecessarily high. Therefore, even when the reception volume is difficult to hear, it may not be possible to set the reception volume high.
[0019]
The present invention has been proposed in order to solve the above-mentioned problems of the prior art. The purpose of the present invention is to register various setting values for echo cancellation in advance and allow a user to arbitrarily or automatically register the setting values. It is another object of the present invention to provide a hands-free communication device and a hands-free communication program capable of realizing optimum echo cancellation by enabling echo cancellation based on the set value.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that a handset for making a call is provided so as to be connectable, voice input means for inputting a voice to be transmitted to the handset, and In a hands-free communication device having voice output means for outputting a reception voice and echo cancellation means for canceling the transmission voice and echo in the reception voice, a setting value for echo cancellation according to the type of the handset A registration unit for registering the handset, and a setting value which is a reference for echo cancellation by the echo cancellation unit among the setting values registered in the registration unit for the handset is selected according to the handset to be connected. And a handset-specific set value selecting means.
[0021]
According to a fifth aspect of the present invention, the invention of the first aspect is grasped from the viewpoint of a program executable by a computer. By controlling the computer, it is possible to input a transmission voice to a handset for making a call. In the hands-free call program for outputting the received voice and canceling the echo in the transmitted voice and the received voice, the computer registers the set value for echo cancellation according to the type of the handset, and the registered It is characterized in that, among the set values, a set value serving as a reference for echo cancellation is selected according to the handset.
[0022]
According to the first and fifth aspects of the present invention, the optimum setting value is selected according to the type of the handset, and the echo cancellation is performed based on the selected setting value.
[0023]
According to a second aspect of the present invention, in the hands-free communication device according to the first aspect, a speed detecting means for detecting a traveling speed of the moving body and a set value for echo cancellation according to the traveling speed of the moving body are registered. A speed-dependent register, and among the set values registered in the speed-dependent register, a set value serving as a reference for echo cancellation by the echo canceler, according to the speed of the moving object detected by the speed detector. And a speed-specific set value selecting means.
[0024]
According to a sixth aspect of the present invention, in the hands-free call program according to the fifth aspect, the computer is caused to detect a traveling speed of the moving body and register a set value for echo cancellation according to the traveling speed of the moving body. In addition, among the registered setting values, a setting value serving as a reference for echo cancellation is selected according to the detected speed of the moving object.
[0025]
According to the second and sixth aspects of the present invention, the optimum setting value is selected according to the traveling speed of the moving object, and the echo cancellation is performed based on the selected setting value. .
[0026]
According to a third aspect of the present invention, in the hands-free communication device according to the first or second aspect, the echo canceling unit includes an acoustic echo canceling unit and a line echo canceling unit.
According to the third aspect of the present invention, the acoustic echo and the line echo can be canceled.
[0027]
According to a fourth aspect of the present invention, in the hands-free communication device according to any one of the first to third aspects, the echo canceling unit includes at least one of a noise canceling unit and a volume control unit. .
According to the fourth aspect of the present invention, since the noise can be reduced and the volume can be controlled, the quality of the call voice can be further improved.
[0028]
The invention according to claim 7, wherein a handset for making a call is provided so as to be connectable, a voice input means for inputting a voice transmitted to the handset, and a voice output for outputting a voice received from the handset. Means and echo canceling means for canceling echoes in the transmitted voice and the received voice, wherein the echo cancellation adjusting means adjusts at least one echo canceling amount in the transmitted voice and the received voice. And setting registering means for registering a setting value corresponding to the echo cancellation amount adjusted by the echo canceling adjusting means, wherein the echo canceling means, based on the setting value registered in the setting registering means, It is configured to cancel at least one echo in the transmitted voice and the received voice. Characterized in that it is.
[0029]
According to a tenth aspect of the present invention, the invention of the seventh aspect is captured from the viewpoint of a program executable by a computer, and a voice input for inputting a transmission voice to a handset for making a telephone call to the computer. Means, a voice output means for outputting a received voice from the handset, and a hands-free call program functioning as an echo canceling means for canceling at least one echo in the transmitted voice and the received voice. Functioning as echo cancellation adjusting means for adjusting at least one echo cancellation amount in the transmission voice and the reception voice, and setting registration means for registering a setting value corresponding to the echo cancellation amount adjusted by the echo cancellation adjustment means. And the echo canceling means Based on the registered setting value in the setting registration means, so as to cancel at least one echo in the transmitted voice and the received voice, it is characterized by causing the computer to function.
[0030]
According to the seventh and tenth aspects of the present invention, when the echo canceling amount is adjusted by the echo canceling adjusting means, the optimum echo canceling amount is set even in the subsequent call based on the set value at that time. Can be realized.
[0031]
The invention according to claim 8 is the hands-free communication device according to claim 7, wherein the registration of the setting value in the setting registration means and the echo cancellation by the echo canceling means are performed for each handset or with the handset. It is set to be executed for each combination with the handset of the other party.
[0032]
The invention according to claim 11 captures the invention according to claim 8 from the viewpoint of a program executable by a computer. In the hands-free call program according to claim 10, the setting value of the setting value by the setting registration unit is set. The computer is operated such that registration and echo cancellation by the echo canceling unit are executed for each handset or each combination of the handset and the other handset that is talking to the handset. .
[0033]
According to the above-described inventions of the eighth and eleventh aspects, the setting value for echo cancellation is registered for each handset or each combination of the handset and the handset of the other party talking to the handset. Since echo cancellation is performed based on this, optimum echo cancellation can be automatically realized according to different handsets and different parties.
[0034]
According to a ninth aspect of the present invention, in the hands-free communication device according to the seventh or eighth aspect, the echo canceling unit controls at least one of a reception sound volume and a transmission sound volume based on the set value. It is characterized by including a part.
[0035]
According to a twelfth aspect of the present invention, the invention of the ninth aspect is viewed from the viewpoint of a computer-executable program. However, the computer is caused to function so as to include a volume control unit that controls at least one of a reception volume and a transmission volume based on the set value.
[0036]
According to the ninth and twelfth aspects of the present invention described above, the transmission and reception sound volumes that affect the echo canceling effect can be set to appropriate values according to the model of the transmission / reception device and the transmission / reception device of the other party. It is possible to automatically obtain the optimum volume even when combined with another sound source.
[0037]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention (hereinafter, referred to as “embodiments”) will be specifically described with reference to the drawings. In addition, the present embodiment can be understood as a hands-free communication device, a method and a program for realizing these by a computer, and a recording medium on which the program is recorded.
[0038]
Further, the present embodiment can be realized by controlling a computer with software including a program and data.However, in this case, the way of realizing hardware and software can be variously changed. Virtual circuit blocks that realize the functions of the present embodiment are used.
[0039]
[First Embodiment]
[Constitution]
First, a first embodiment will be described. That is, as shown in FIG. 1, in the present embodiment, a main CPU 10, a memory 11, a display control unit 12, a display device 13, an ASIC 20, a recording medium control device 21, an input device 22, It comprises a position / direction detection unit 23, a vehicle speed detection unit 24, an absolute position / direction detection unit 25, a telephone communication control unit 30, a sound control unit 40 connected to the navigation system, a speaker 50, a microphone 51, and the like. . The handset described in the claims is a mobile phone 8 in the present embodiment.
[0040]
[Configuration of navigation system]
The main CPU 10 configuring the navigation system is a control device that controls the entire system. The memory 11 is a storage unit that stores a work area of the system, programs, and the like. For example, an SRAM or an SDRAM (Synchronous DRAM) with a high access speed can be used. The display control unit 12 is a control unit that draws a map, a menu button, and the like to be displayed on the display device 13. The display device 13 is, for example, a liquid crystal or organic EL display device.
[0041]
The ASIC (Application Specific Integrated Circuit) 20 is a circuit integrated with a function of controlling input / output of various data and integrated into one chip. The ASIC 20 in the present embodiment, for example, via the communication interface (IF) 20 a for controlling the mobile phone 8 connected to the telephone communication control unit 30 in the navigation system, and the speaker 50 connected to the sound control unit 40 A CODEC-IF 20b for inputting / outputting acoustic data and a sound volume of a sound output from the speaker 50 to output a guide sound of the navigation system or to input a command from the user to the navigation system via the microphone 51. It has a volume control IF 20c for outputting a control signal.
[0042]
Further, the ASIC 20 is connected to a relative position / azimuth detecting unit 23 such as a gyro sensor, a vehicle speed detecting unit 24 for detecting a vehicle speed pulse, a back signal, etc., and an absolute position / azimuth detecting unit 25 such as a GPS. A vehicle IF 20d to which data from the unit is input is provided. Further, the ASIC 20 is connected to a recording medium control device 21 that controls reading of data from a recording medium (for example, a CD-ROM, a DVD-ROM, an HDD, or the like). Data necessary for realizing the navigation system, such as map data, is recorded on the recording medium.
[0043]
The main CPU 10 and the ASIC 20 have components necessary for realizing a navigation system based on data input via the vehicle IF 20d, map data from a recording medium, and the like. Can be applied, and the description is omitted. Further, the ASIC 20 is connected to an input device 22 for the user to input various operations and settings to the navigation system, the telephone communication control unit 30 and the sound control unit 40. As the input device 22, a switch of a front panel, a remote control, a touch panel, or the like can be used, but is not limited to a specific device. The touch panel configured on the display device 13 can be used as an input device.
[0044]
[Configuration of telephone communication control unit]
The telephone communication control unit 30 is a control unit for realizing a telephone call via the mobile phone 8, and controls an echo cancel unit 31 for canceling an echo of a call voice, communication with a navigation system, and control of the echo cancel unit 31. The system includes a CPU 32, a level shift unit 33 for converting a signal exchanged with the navigation system to an appropriate level, an SRAM 34 as a work area, and a flash memory 34 as a storage area for control programs and set values.
[0045]
As shown in FIG. 2, the echo canceling unit 31 includes an acoustic echo canceling unit 31b, a noise canceling unit 31c, and a CODEC 31a, 31f that perform encoding and decoding suitable for signal processing on audio signals and data. A PAD 31d and a line echo canceling unit 31e are provided. The acoustic echo canceling unit 31b is a unit that cancels an acoustic echo that is returned from a signal output from the speaker as an echo and input to the microphone again. The line echo canceling unit 31e is a unit that cancels a line echo that is a signal in which a delay generated in the middle of the line returns as an echo due to a hybrid impedance match or the like. The noise canceling unit 31c is a unit that cancels noise such as high-frequency noise and running noise. The PAD 31d is means for suppressing the decibel value of the input signal to a value suitable for the output sound.
[0046]
The echo cancellation (including noise cancellation by the noise cancellation unit 31c and volume control by the PAD 31d) in the echo cancellation unit 31 can be basically performed using the above-described conventional technology and other known technologies. . However, in the present embodiment, various setting values for echo cancellation are registered in advance as unique setting values for each carrier of each mobile phone. For example, it is assumed that four companies d, a, J, and T are registered. Examples of the setting value include a delay time in the acoustic echo canceling unit 31b, a delay time in the line echo canceling unit 31e, a coefficient to be multiplied by the delayed signal, a frequency to be reduced or emphasized in the noise canceling unit 31c, and a decibel value in the PAD 31d. It is not limited to these.
[0047]
Then, when the user uses the system for the first time, or when the mobile phone is exchanged for another model, the user selects which company's mobile phone to use by using the input device 22. Note that it is convenient to select the set value by, for example, selecting a button for displaying each carrier displayed on the display device 13 with the input device 22. Also, a set value corresponding to the traveling speed of the vehicle is prepared in advance. For example, when the vehicle is stopped, traveling at a low speed, and traveling at a high speed, the noise level and the like are different from each other. Therefore, a set value pattern of echo cancellation corresponding to the noise level is registered.
[0048]
As described above, the storage area of the set value registered in advance or the set value to be selected functions as the handset register unit and the speed register unit of the first and second embodiments. It is free to use a storage medium. For example, a registration unit for each handset and a registration unit for each speed can be configured in a part of the memory 11 or the flash memory 34 to store the registered setting value and the selected setting value. The configuration is not limited to this. Further, the CPU 32 has a function of selecting a reference set value at the time of echo cancellation in the echo cancellation unit 31. In other words, when the user selects a set value selected by the user from among the set values set by the mobile company, the function functions as a handset-specific set value selecting means according to claim 1 and is based on the vehicle speed detected by the vehicle speed detection unit 7. When the set value is selected by the user, it functions as the set value selecting means for each speed.
[0049]
[Configuration of acoustic control unit]
Further, the acoustic control unit 40 includes an MIC-IF 41 for outputting an input voice from the microphone 51 to the navigation system and the telephone communication control unit 30, an amplifier 42 for amplifying an output signal from the speaker 50, and control from the navigation system. A volume controller 43 controls the output volume according to the signal, and a CODEC 44 encodes and decodes a signal exchanged with the navigation system.
[0050]
[Action]
The operation of the present embodiment as described above will be described below.
[Registration of settings according to the telephone company]
First, as described above, the user selects a setting value suitable for the mobile phone 8 used by the user from the unique setting values registered for each mobile phone. Since this set value is a set value tuned in a stopped state, the system uses this set value as it is when the user is actually in a stopped state when making a call. In addition, this setting value is fixed as a default after the first time unless there is a change request from the user.
[0051]
For example, assuming that the diffusion rate of the mobile phone is the largest in the company d, the mobile phone of the company d is used for tuning, and the setting value is considered as a reference. Here, assuming that the actual reception volume tends to decrease in the order of company a, company d, company J, and company T, the reception volume increases when a mobile phone of company a is used, so that the echo increases. I do. In order to prevent this, the set value for company a is set so that the echo cancellation amount is increased. Also, in the case of Company J and Company T, the received sound volume is low, and it is difficult to hear the same volume. Therefore, the set values for the companies J and T are adjusted to the level at which the volume can be heard.
[0052]
[Set value according to running speed]
As the set value corresponding to the traveling speed, for example, N set values in consideration of noise during traveling are registered. The set value is, for example, a value obtained by changing a cancel pattern of the noise canceling unit 31c prepared in the echo canceling unit 31. For example, when N = 2, that is, when two patterns are used for the low speed and the high speed, the cancellation amount is set to be small for the low speed, the pattern is used to minimize the deterioration of sound quality, and the cancellation amount is set to be large for the high speed. It is set to a pattern that efficiently prevents noise from being mixed.
[0053]
[Echo cancellation procedure]
The processing procedure of echo cancellation when the set value according to the running speed is two patterns for low speed and high speed (N = 2) will be described with reference to the flowchart of FIG. First, the user selects a set value according to the model of the mobile phone 8 in advance (step 301). Then, the mobile phone 8 is set and connected to the telephone communication control unit 30 (step 302). When there is an outgoing call or an incoming call on the set mobile phone 8, a call is started (step 303).
[0054]
Based on the speed pulse input to the ASIC 20 via the vehicle IF 20d from the vehicle speed detector 24, a set value corresponding to the speed is selected. That is, when the vehicle is traveling (step 304) and the speed is within a preset low speed range (step 305), a set value for low speed traveling is read (step 306). If the vehicle is running (step 304) and the speed is within a preset high-speed range (step 305), a set value for high-speed running is read (step 307).
[0055]
Then, echo cancellation is performed by the echo canceling unit 31 based on the set value according to the preselected mobile model and the set value for low-speed or high-speed running (step 308). That is, the transmission voice signal input from the microphone 51 and the reception voice signal from the mobile phone 8 are input to the echo canceling unit 31. Then, echo cancellation is performed by the acoustic echo canceling unit 31b and the line echo canceling unit 31e. Noise such as running noise is canceled by the noise canceling unit 31c, and the decibel value of the audio signal is controlled to an appropriate value by the PAD 31d. Therefore, the output voice from the speaker 50 and the voice transmitted to the mobile phone 8 are easily heard. Further, when the call ends (step 309), the process ends.
[0056]
[effect]
According to the present embodiment as described above, echo cancellation with an optimum setting value is performed by selecting a pre-registered setting value according to an echo component different for each mobile phone company. The quality is improved. In particular, since echo cancellation according to the traveling speed is also taken into account based on company-specific set values, appropriate processing according to the use environment can be performed. Furthermore, noise cancellation and volume control can be performed in addition to cancellation of acoustic echo and line echo, so that the quality of call voice can be further improved.
[0057]
[Second embodiment]
[Constitution]
Next, a second embodiment will be described. As shown in FIG. 4, the present embodiment has basically the same configuration as the prior art shown in FIG. However, in the DSP 106 of the present embodiment, under the control of the CPU 116, the attenuator units (ATT) 201 to 204, which can change the gain setting, transmit the transmission voice from the microphone 102 to the transmission unit to the mobile telephone terminal 110. The output unit is configured to have a speech voice output unit, a reception voice input unit from the mobile telephone terminal 110, and a reception voice output unit to the speaker 115.
[0058]
Further, a memory 205 as a setting registration unit for storing various parameters, telephone numbers, mobile phone terminal specific information, and the like is connected to the CPU 206 via a control signal line 206. The operation key 117 has a function of performing various operation inputs described in the following operation. Further, the CPU 116 is connected to the mobile telephone terminal 110 via the control signal line 207 in order to instruct the mobile telephone terminal 110 to connect a telephone line and to obtain a telephone number, unique information, and the like from the mobile telephone terminal 110. ing.
[0059]
Each functional block between the microphone 102 and the mobile phone terminal 110 and between the mobile phone terminal 110 and the speaker 115 functions as an echo canceling unit, and ATTs 201 to 204, the volume 113, the CPU 116, and the like, which are part of them. Functions as an echo cancellation adjusting unit, but when the user adjusts the echo cancellation amount (including the volume) using the operation key 117, the operation key 117 is also included in the echo cancellation adjusting unit. The volume 113 may be used as a sound source other than the telephone, or may be used exclusively for the telephone.
[0060]
[Action]
[Overall processing]
The flow of the overall processing in this embodiment as described above will be described. That is, the voice input from the microphone 102 is taken into the ATT 104 via the buffer 103. At this time, the gain of the ATT 104 is a fixed value adjusted at the development stage. The output of the ATT 104 is converted from an analog signal to a digital signal by the A / D converter of the CODEC 105 and input to the DSP 106.
[0061]
The digital audio signal input to the DSP 106 is input to the ATT 201. At this time, the gain of the ATT 201 is a variable value controlled by the CPU 116. The DSP 106 compares the microphone audio signal input from the A / D converter of the CODEC 105 with the reception audio signal input from the A / D converter of the CODEC 107, and performs an echo cancellation process.
[0062]
The microphone sound that has been subjected to the echo cancellation processing by the DSP 106 is taken into the ATT 202 inside the DSP 106. At this time, the gain of the ATT 202 is a variable value controlled by the CPU 116. The output of the ATT 202 is input as a digital audio signal to the D / A converter of the CODEC 107 and is converted into an analog signal. This signal is transmitted to the mobile telephone terminal via the ATT 108 and the buffer 109 as a transmission voice signal.
[0063]
Next, the received voice signal input from the mobile telephone terminal 110 is input to the CODEC 107 via the buffer 111 and the ATT 112. The output of the ATT 112 is converted from an analog signal to a digital signal by the A / D converter of the CODEC 107 and input to the DSP 106. The digital audio signal input to the DSP 106 is input to the ATT 203. At this time, the gain of the ATT 203 is a variable value controlled by the CPU 116. This signal is used by the DSP 106 for echo cancellation processing, and is taken into the ATT 204. At this time, the gain of the ATT 204 is a variable value controlled by the CPU 116.
[0064]
Thereafter, the output of the ATT 204 is input as a digital audio signal to the D / A converter of the CODEC 105 and is converted into an analog signal. The gain of the audio signal converted into an analog signal is determined by a user's operation on the volume 113 and is input to the amplifier 114. The output signal of the amplifier 114 is input to a speaker 115 connected externally, and the speaker 115 outputs a received voice.
[0065]
The gain of the volume 113 is a variable value controlled by the CPU 116. The above-mentioned ATTs 201 to 204 and the volume 113 are controlled by the CPU 116 when the user operates the operation keys 117 and the signals are detected by the CPU 116, and are controlled in accordance with parameters which are set values in accordance with the signals. Further, the CPU 116 can automatically control based on the set values registered in the memory 205.
[0066]
[Reception volume registration processing]
Next, a processing procedure for registering the set value of the reception volume for each model of the mobile telephone terminal 110 will be described with reference to the flowchart of FIG. First, the user connects the mobile telephone terminal 110 to the in-vehicle information terminal 101 (step 501). Then, by operating the operation key 117, the reception volume adjustment mode is started (step 502). Further, by operating the operation keys 117, the mobile telephone terminal 110 is connected to the telephone line according to the instruction of the CPU 116 (step 503).
[0067]
At this time, for example, it is optimal to call the "time signal station" as a reference of the reception sound volume. When a call is made to the "time signal station", the sound of the time signal is output from the speaker 115 (step 504), and the user confirms the volume. Then, the user operates the operation key 117 to change the gain value of the ATT 204 via the CPU 116 so as to obtain the optimum volume (step 505). The reception volume may be set to be adjusted automatically. For example, when a line is connected to a specific telephone station (time signal station), the CPU 116 automatically controls the ATT 204 so that the volume of the time signal becomes an optimum value based on a reference value registered in the memory 205 in advance. May be changed.
[0068]
The value adjusted in this manner is stored in the memory 205 via the CPU 116 by operating the operation key 117 (step 506). At this time, the CPU 116 reads the unique information of the mobile telephone terminal 110 via the control signal line 207, links the information with the value of the ATT 204, and stores it in the memory 205.
[0069]
[Received sound volume reading process]
Next, a procedure for reading a stored value according to the model of the mobile telephone terminal 110 with which a call is made will be described with reference to the flowchart of FIG. First, the mobile telephone terminal 110 is connected to the in-vehicle information terminal 101 (step 601). Then, the CPU 116 reads the unique information from the mobile telephone terminal 110 via the control signal line 207 (step 602). Then, based on the unique information, the CPU 116 reads the gain setting value of the ATT 204 corresponding to the unique information from the memory 205 (Step 603). This value is transmitted from the CPU 116 to the DSP 106 via the control signal line 119, and is set in the ATT 204 (step 604). The above-described signal processing is performed based on the value thus set.
[0070]
[Transmission volume registration processing for each combination]
Next, a procedure of a process for setting the transmission volume for each combination of the model of the mobile telephone terminal 110 connected to the in-vehicle information terminal 101 and the model of the other party's telephone terminal will be described with reference to FIG. First, the mobile telephone terminal 110 is connected to the in-vehicle information terminal 101 (step 701). At this time, the CPU 116 acquires the unique information of the mobile phone terminal 110 via the control signal line 207. Then, the user operates the operation key 117 to activate the transmission volume adjustment mode (step 702). Next, by operating the operation keys 117, a call is made to a desired party and a telephone line is connected (step 703).
[0071]
At this time, the CPU 116 acquires the other party's telephone number from the mobile telephone terminal 110 via the control signal line 207 (step 704). The user confirms the reception volume of the telephone on the other side by making a telephone call (step 705). The user operates the operation key 117 in accordance with the level of the volume, and changes the gain value of the ATT 202 via the CPU 116 so as to obtain the optimum volume (step 706). By operating the operation key 117, the adjusted gain value of the ATT 202 is linked to the unique information of the mobile telephone terminal 110 and the telephone number of the other party via the CPU 116 and stored in the memory 205 (step 707).
[0072]
[Transmission volume reading process for each combination]
Next, a procedure for reading out the stored set values for each combination of the model of the mobile telephone terminal 110 connected to the in-vehicle information terminal 101 and the model of the other party's telephone terminal will be described with reference to the flowchart of FIG. First, the mobile telephone terminal 110 is connected to the in-vehicle information terminal 101 (step 801). Then, the CPU 116 reads the unique information from the mobile telephone terminal 110 via the control signal line 207 (step 802). When the user operates the operation key 117 to call the other party and connect the telephone line (step 803), the CPU 116 obtains the other party's telephone number via the control signal line 207 (step 804). CPU 116 reads the corresponding gain value of ATT 204 from memory 205 based on the acquired unique information of mobile telephone terminal 110 and the telephone number of the other party (step 805). This value is transmitted from the CPU 116 to the DSP 106 via the control signal line 119, and is set in the ATT 204 (step 806). The above-described signal processing is performed based on the value thus set.
[0073]
[Echo cancellation parameter registration processing for each combination]
Next, a procedure for registering the echo cancellation parameter for each combination of the model of the mobile telephone terminal 110 connected to the in-vehicle information terminal 101 and the model of the other party's telephone terminal will be described with reference to FIG. First, the mobile telephone terminal 110 is connected to the in-vehicle information terminal 101 (step 901). At this time, the CPU 116 acquires the unique information of the mobile phone terminal 110 via the control signal line 207. Then, by operating the operation key 117, the echo cancel parameter adjustment mode is activated (step 902). Next, by operating the operation keys 117, a call is made to a desired party and a telephone line is connected (step 903).
[0074]
At this time, the CPU 116 acquires the telephone number of the other party from the mobile telephone terminal 110 via the control signal line 207 (step 904). The user confirms the echo amount of the telephone call on the other side by talking (step 905). In accordance with the magnitude of the echo amount, the user operates the operation key 117 to change the value of the echo cancellation parameter processed by the ATTs 201 and 203 and the DSP 106 via the CPU 116 so that the optimal echo amount is obtained (step 906). By operating the operation key 117, the adjusted value of the echo cancellation parameter is linked to the unique information of the mobile telephone terminal 110 and the telephone number of the other party via the CPU 116, and stored in the memory 205 (step 907). .
[0075]
[Echo cancellation parameter reading process for each combination]
Next, a procedure for reading out the stored set values for each combination of the model of the mobile telephone terminal 110 connected to the in-vehicle information terminal 101 and the model of the other party's telephone terminal will be described with reference to the flowchart of FIG. First, the mobile telephone terminal 110 is connected to the in-vehicle information terminal 101 (step 1001). Then, the CPU 116 reads the unique information from the mobile telephone terminal 110 via the control signal line 207 (step 1002). When the user operates the operation key 117 to call the other party and connect the telephone line (step 1003), the CPU 116 obtains the other party's telephone number via the control signal line 207 (step 1004). The CPU 116 reads the corresponding values of the echo cancellation parameters processed by the ATTs 201 and 203 and the DSP 106 from the memory 205 based on the acquired unique information of the mobile telephone terminal 110 and the telephone number of the other party (step 1005). This value is transmitted from the CPU 116 to the DSP 106 via the control signal line 119, and is set in the ATTs 201 and 203 and the DSP 106 (step 1006). The above-described signal processing is performed based on the value thus set.
[0076]
[effect]
According to the above-described embodiment, the user adjusts the difference in the transmission and reception volumes depending on the model of the mobile telephone terminal 110 connected to the on-vehicle information terminal 101 for each product, and adjusts the adjusted result to the mobile telephone terminal 110. By registering the mobile phone terminal 110 by linking to the unique information, even if the mobile telephone terminal 110 is exchanged, an optimum volume according to the model is automatically obtained.
[0077]
Further, the user adjusts the difference in the echo cancellation effect including the transmission and reception volume depending on the type of the other party's telephone, for each of the other party's telephones, and links the adjusted result to the other party's telephone number or the like and registers the result. When talking to the other party's telephone again, an optimal volume and echo canceling effect can be obtained.
[0078]
Also, since the amount of echo cancellation including the sound volume can be adjusted according to the user and the other party, an optimum volume and echo canceling effect can be obtained according to the preference of the user and the other party. As a result, a sound volume and an echo canceling effect suitable for the size of the vehicle of the user can be obtained.
[0079]
Further, since the volume from the speaker 115 on the vehicle side is adjusted not by the volume 113 alone but by digital attenuation processing in the DSP 106, the difference in volume level from the sound source other than the telephone is reduced. can do.
[0080]
[Other embodiments]
The present invention is not limited to the above embodiment. For example, as the set value for each type of handset, it is possible to perform finer control not only for each mobile phone company but also for each type of mobile phone. Further, the setting value may be automatically selected when the mobile phone is set. In this case, a setting value registered in advance in the telephone communication control unit or the navigation system side may be automatically selected based on a signal for identifying a telephone company or a model from the mobile phone side, The setting value output from the mobile phone may be automatically registered and selected in the phone communication control unit or the navigation system.
[0081]
Also, the set value corresponding to the traveling speed of the vehicle is not limited to the one exemplified in the above embodiment. For example, instead of constantly monitoring the vehicle speed and changing the pattern, after selecting a cancel pattern based on the speed at the start of the call, the load on the CPU can be reduced by fixing the selected pattern. A method of preparing more patterns according to the speed and performing fine-grained control is also conceivable.
[0082]
Examples of the data to be adjusted and registered include various data such as information on the own mobile phone terminal, information on the other party's phone, parameters for the volume and the amount of echo cancellation, and any of these. Whether to register and use data in combination can be freely set. It is also possible to register and use set values for each type of automobile. A setting may be made so that the setting value information can be obtained or updated irregularly or periodically using a communication function and a network connection function of a mobile phone or a navigation system. The setting values for each telephone and each vehicle type may be manually input.
[0083]
As the sound output means and the sound input means, any known means such as headphones or earphones, or a microphone provided in a headset (which may be integrated with the headphones) can be applied. As the handset, any mobile communication device for voice communication, such as a mobile phone and a PHS, can be applied. Further, the moving object to which the present invention is applied is not limited to an automobile, but can be applied to any object such as a motorcycle, an airplane, a ship, and a railway vehicle. It is not limited to the combination with the navigation system. Furthermore, it can also be used in a stationary place indoors and outdoors instead of a mobile object.
[0084]
【The invention's effect】
As described above, according to the present invention, various setting values for echo cancellation are registered in advance, and the user can arbitrarily or automatically perform echo cancellation based on the setting values. It is possible to provide a hands-free communication device and a hands-free communication program that can realize optimal echo cancellation.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing a configuration of a first embodiment of the present invention.
FIG. 2 is a block diagram showing an echo canceling unit in the embodiment of FIG.
FIG. 3 is a flowchart showing a processing procedure in the embodiment of FIG. 1;
FIG. 4 is a functional block diagram showing a configuration of a second embodiment of the present invention.
FIG. 5 is a flowchart showing a received sound volume registration process in the embodiment of FIG. 4;
FIG. 6 is a flowchart showing a reception sound volume reading process in the embodiment of FIG. 4;
FIG. 7 is a flowchart showing a combination-based volume registration process in the embodiment of FIG. 4;
FIG. 8 is a flowchart showing a combination-specific volume reading process in the embodiment of FIG. 4;
FIG. 9 is a flowchart showing a combination-based echo cancellation parameter registration process in the embodiment of FIG. 4;
FIG. 10 is a flowchart showing a combination-based echo cancellation parameter reading process in the embodiment of FIG. 4;
FIG. 11 is a block diagram showing an example of a conventional hands-free communication device.
FIG. 12 is a block diagram showing an example of a hands-free communication device configured in a conventional in-vehicle information terminal.
[Explanation of symbols]
1,31 ... Echo cancellation part
3. Navigation system
7 ... Vehicle speed detector
8. Mobile phone
9: Telephone communication control unit
10: Main CPU
11, 205 ... memory
12 Display control unit
13 Display device
20… ASIC
20a: Communication IF
20b ... CODEC-IF
20c: Volume control IF
20d… Vehicle IF
21. Recording medium control device
22 input device
23: relative position / azimuth detection unit
24 ... Vehicle speed detector
25 ... Absolute position / azimuth detector
26 ... Vehicle speed detector
30 ... telephone communication control unit
31a, 31f ... CODEC
31b ... Acoustic echo canceling section
31c: Noise canceling section
31d… PAD
31e: Line echo cancel unit
33: Level shift unit
34 ... Flash memory
40 ... Sound control unit
41 ... MIC-IF
42,114 ... Amplifier
43 ... Volume control unit
50, 115 ... speaker
51,102… Microphone
101 ... In-vehicle information terminal
103, 109, 111 buffers
113 ... Volume
110 ... Mobile phone terminal
117 ... operation keys
118, 119, 120, 206, 207 ... control signal lines

Claims (12)

A handset for making a call is provided so as to be connectable, voice input means for inputting a voice transmitted to the handset, voice output means for outputting a voice received from the handset, A hands-free communication device having echo cancellation means for canceling an echo in the received voice,
A handset-specific registration unit that registers a setting value for echo cancellation according to the type of the handset,
Among the setting values registered in the handset-specific registration means, a handset-specific setting value selection means for selecting a setting value serving as a reference for echo cancellation by the echo cancellation means in accordance with the connected handset,
A hands-free communication device comprising: Speed detection means for detecting the traveling speed of the moving body,
Speed-specific registration means for registering a set value for echo cancellation according to the traveling speed of the moving object,
Among the set values registered in the speed-dependent registration unit, a set value according to speed for selecting a set value serving as a reference for echo cancellation by the echo cancellation unit in accordance with the speed of the moving object detected by the speed detection unit. The hands-free communication device according to claim 1, further comprising a selection unit. 3. The hands-free communication device according to claim 1, wherein the echo canceling unit includes an acoustic echo canceling unit and a line echo canceling unit. The hands-free communication device according to any one of claims 1 to 3, wherein the echo cancellation unit includes at least one of a noise cancellation unit and a volume control unit. By controlling the computer, in the hands-free call program for inputting the transmission voice to the handset for making a call, outputting the reception voice, and canceling the echo in the transmission voice and the reception voice,
To the computer,
Register the setting value for echo cancellation according to the type of handset,
A hands-free call program, wherein a set value serving as a reference for echo cancellation among registered set values is selected according to a handset. On the computer,
Detect the traveling speed of the moving object,
Register the setting value for echo cancellation according to the traveling speed of the moving object,
6. The program according to claim 5, wherein, among the registered setting values, a setting value serving as a reference for echo cancellation is selected according to the detected speed of the moving object. A handset for making a call is provided so as to be connectable, voice input means for inputting a voice transmitted to the handset, voice output means for outputting a voice received from the handset, An echo canceling means for canceling an echo in the received voice,
Echo cancellation adjustment means for adjusting at least one echo cancellation amount in the transmission voice and the reception voice,
Setting registration means for registering a setting value corresponding to the echo cancellation amount adjusted by the echo cancellation adjustment means,
With
Wherein the echo canceling means is configured to cancel at least one of the echoes in the transmitted voice and the received voice based on the setting value registered in the setting registering means. apparatus. The registration of the setting value in the setting registration unit and the echo cancellation by the echo canceling unit are set to be performed for each handset or each combination of the handset and the other handset that is talking to the handset. The hands-free communication device according to claim 7, wherein: 9. The hands-free communication device according to claim 7, wherein the echo canceling unit includes a sound volume control unit that controls at least one of a reception sound volume and a transmission sound volume based on the set value. A computer, voice input means for inputting a transmission voice to a handset for making a call, voice output means for outputting a reception voice from the handset, and at least one of the transmission voice and the reception voice In a hands-free call program that functions as an echo canceling unit that cancels echo,
To the computer,
Echo cancellation adjustment means for adjusting at least one echo cancellation amount in the transmission voice and the reception voice,
Functioning as setting registration means for registering a setting value corresponding to the echo cancellation amount adjusted by the echo cancellation adjustment means,
A hand that causes the computer to function so that the echo canceling means cancels at least one echo in the transmission voice and the reception voice based on the setting value registered in the setting registration means. Free call program. The computer so that the registration of the setting value by the setting registration unit and the echo cancellation by the echo canceling unit are executed for each handset or each combination of the handset and the other handset that is talking to the handset. 11. The program for hands-free communication according to claim 10, wherein 12. The computer according to claim 10, wherein the echo canceling unit causes the computer to function so as to include a sound volume control unit that controls at least one of a reception sound volume and a transmission sound volume based on the set value. Hands-free calling program described.

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