CN1797544A - Method and device for voice process at wireless terminal - Google Patents
Method and device for voice process at wireless terminal Download PDFInfo
- Publication number
- CN1797544A CN1797544A CN 200410103578 CN200410103578A CN1797544A CN 1797544 A CN1797544 A CN 1797544A CN 200410103578 CN200410103578 CN 200410103578 CN 200410103578 A CN200410103578 A CN 200410103578A CN 1797544 A CN1797544 A CN 1797544A
- Authority
- CN
- China
- Prior art keywords
- sound pressure
- resistor
- signal
- sound
- wireless terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 20
- 230000005236 sound signal Effects 0.000 claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000003672 processing method Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 description 25
- 101000893549 Homo sapiens Growth/differentiation factor 15 Proteins 0.000 description 22
- 101000692878 Homo sapiens Regulator of MON1-CCZ1 complex Proteins 0.000 description 22
- 102100026436 Regulator of MON1-CCZ1 complex Human genes 0.000 description 22
- 102000008482 12E7 Antigen Human genes 0.000 description 18
- 108010020567 12E7 Antigen Proteins 0.000 description 18
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 102220007331 rs111033633 Human genes 0.000 description 1
- 102220330008 rs1555864377 Human genes 0.000 description 1
- 102220012898 rs397516346 Human genes 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
- G10L2021/02166—Microphone arrays; Beamforming
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Telephone Function (AREA)
Abstract
本发明公开了一种无线终端语音处理的方法，包括：接收来自语音方向的声音信号并将该声音信号转换成声压信号，同时接收来自第二方向的声音信号并将该声音信号转换成声压信号，分别对接收到的不同方向的声压信号进行放大处理；对经过放大处理后的不同方向的声压信号进行差分处理后输出。本发明同时公开了一种无线终端语音处理的装置，除了包括一支麦克风和一套模拟放大电路外，还包括另一支麦克风、另一套模拟放大电路和一套差分处理电路，两支麦克风分别将接收到的不同方向的声音信号转换成声压信号后输入模拟放大电路，然后差分电路对来自不同模拟放大电路的输出信号进行差分处理，保证了无线终端即使在强噪声环境下，也能大大降低噪声，具有良好的通话质量。
The invention discloses a voice processing method of a wireless terminal, comprising: receiving a sound signal from a voice direction and converting the sound signal into a sound pressure signal, and simultaneously receiving a sound signal from a second direction and converting the sound signal into a sound pressure signal. The pressure signal is amplified respectively for the received sound pressure signals in different directions; the amplified sound pressure signals in different directions are differentially processed and then output. The invention also discloses a voice processing device for a wireless terminal. In addition to a microphone and a set of analog amplifying circuits, it also includes another microphone, another set of analog amplifying circuits, and a set of differential processing circuits. Two microphones The received sound signals from different directions are converted into sound pressure signals and then input to the analog amplifier circuit, and then the differential circuit performs differential processing on the output signals from different analog amplifier circuits, ensuring that the wireless terminal can work even in a strong noise environment. Greatly reduce noise, with good call quality.
Description
技术领域technical field
本发明涉及音频处理技术，尤指一种无线终端语音处理的方法及装置。The invention relates to audio processing technology, in particular to a method and device for wireless terminal voice processing.
背景技术Background technique
目前，无线终端中语音处理方案参见图1所示，图1是现有技术无线终端语音处理电路图。At present, the speech processing solution in the wireless terminal is shown in FIG. 1 , which is a circuit diagram of the speech processing of the wireless terminal in the prior art.
图1中，电阻R4与电源VCC相连接，为麦克风(MIC)提供偏置电压；电阻R1＝电阻R2，电阻R1和电阻R2对电源VCC分压，为运算放大器A1提供偏置工作电压，且此时运算放大器的动态范围最大；电容C1用于隔直，电容C2用于滤波；该模拟放大电路运算放大器A1的放大倍数是电阻Rf与电阻R3之比，即放大倍数β＝Rf/R3。这里，MIC在无线终端中的安装方向是MIC接收声音信号的受话端对着人，接收来自人声方向的声音信号。In Fig. 1, the resistor R4 is connected with the power supply VCC to provide a bias voltage for the microphone (MIC); the resistor R1=resistor R2, the resistor R1 and the resistor R2 divide the voltage of the power supply VCC, and provide a bias operating voltage for the operational amplifier A1, and At this time, the dynamic range of the operational amplifier is the largest; the capacitor C1 is used for DC blocking, and the capacitor C2 is used for filtering; the magnification of the operational amplifier A1 of the analog amplifier circuit is the ratio of the resistor Rf to the resistor R3, that is, the magnification β=Rf/R3. Here, the installation direction of the MIC in the wireless terminal is that the receiving end of the MIC that receives the voice signal faces the person, and receives the voice signal from the direction of the voice of the person.
根据图1，MIC将接收到的声音信号转换成声音电信号，即声压信号。设MIC输出的声压信号为Vi，Vi中包括人声声压信号V1和环境噪声声压信号Vcm，则经过该模拟放大电路后的输出电压信号为：According to Figure 1, the MIC converts the received sound signal into a sound electrical signal, that is, a sound pressure signal. Let the sound pressure signal output by the MIC be Vi, and Vi includes the human voice sound pressure signal V1 and the environmental noise sound pressure signal Vcm, then the output voltage signal after passing through the analog amplifier circuit is:
Vo＝(V1+Vcm)×Rf/R3+(R2/(R1+R2))×VCC由于R1＝R2，所以，Vo=(V1+Vcm)×Rf/R3+(R2/(R1+R2))×VCC Since R1=R2, so,
Vo＝β×(V1+Vcm)+VCC/2 ...(1)Vo＝β×(V1+Vcm)+VCC/2 ...(1)
从公式(1)可以看出，在MIC输出的声压信号中，同时包括人声声压信号和环境噪声声压信号，现有技术没有对人声和环境噪声进行分离，而是同时将它们接入模拟放大电路进行放大后送入音频编码器。It can be seen from formula (1) that the sound pressure signal output by the MIC includes both the human voice sound pressure signal and the environmental noise sound pressure signal. The prior art does not separate the human voice and the environmental noise, but simultaneously separates them Connect to the analog amplifier circuit for amplification and send it to the audio encoder.
从图1可以看出，现有技术中，无线终端只采用一支MIC接收声音信号，且使用一套模拟放大电路对MIC输出的声压信号进行放大后即送入音频编码器。It can be seen from FIG. 1 that in the prior art, the wireless terminal only uses one MIC to receive the sound signal, and uses a set of analog amplifier circuits to amplify the sound pressure signal output by the MIC and then sends it to the audio encoder.
这样，在强噪声环境下，比如工地、车间、公交车上等使用无线终端，由于没有对环境噪声进行必要的处理，会造成大量的环境噪声掺杂在人声中，在经过现有的无线终端语音处理后，会使接收方听不清楚对方的说话声；同时通话者要提高嗓门，以增大人声声压强度，吃力地进行通话才能保证对方能勉强听清。In this way, when wireless terminals are used in strong noise environments, such as construction sites, workshops, and buses, due to the lack of necessary processing of environmental noise, a large amount of environmental noise will be mixed in human voices. After the voice processing of the terminal, the receiving party will not be able to hear the other party's voice clearly; at the same time, the caller must raise his voice to increase the sound pressure intensity of the human voice, and only by making a difficult call can the other party be able to hear clearly.
发明内容Contents of the invention
有鉴于此，本发明的主要目的在于提供一种无线终端语音处理的方法，该方法能够减少环境噪声对通话的影响，大大降低噪声，从而很好地保证无线终端的通话质量。In view of this, the main purpose of the present invention is to provide a voice processing method for a wireless terminal, which can reduce the impact of environmental noise on calls, greatly reduce the noise, and thus ensure the call quality of the wireless terminal well.
本发明的另一目的在于提供一种无线终端语音处理的装置，该装置结构简单，能够方便地减少环境噪声对通话的影响，大大削弱环境噪声声压信号，从而很好地保证无线终端的通话质量。Another object of the present invention is to provide a wireless terminal voice processing device, which has a simple structure, can easily reduce the impact of environmental noise on calls, and greatly weaken the sound pressure signal of environmental noise, thereby ensuring the call of the wireless terminal well. quality.
为达到上述目的，本发明的技术方案具体是这样实现的：In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:
一种无线终端语音处理的方法，包括以下步骤：A method for wireless terminal voice processing, comprising the following steps:
A.接收来自语音方向的声音信号并将该声音信号转换成声压信号，同时接收来自另一方向的声音信号并将该声音信号转换成声压信号，分别对接收到的不同方向的声压信号进行放大处理；A. Receive the sound signal from the voice direction and convert the sound signal into a sound pressure signal, and at the same time receive the sound signal from the other direction and convert the sound signal into a sound pressure signal, respectively for the received sound pressure in different directions The signal is amplified;
B.对经过放大处理后的不同方向的声压信号进行差分处理后输出。B. Perform differential processing on the amplified sound pressure signals in different directions before outputting.
该方法步骤A中所述放大处理的放大倍数相等。The magnification factors of the magnification treatment in step A of the method are equal.
该方法步骤B所述差分处理包括：对所述不同方向的声压信号进行模拟/数字转换后作数字差分处理。The differential processing in step B of the method includes: performing analog/digital conversion on the sound pressure signals in different directions and performing digital differential processing.
该方法步骤A中所述另一方向是与无线终端的声音输入方向相反的方向。The other direction in step A of the method is a direction opposite to the sound input direction of the wireless terminal.
一种无线终端语音前端处理的装置，该装置包括第一麦克风MIC，用于接收来自无线终端的语音输入方向的声音信号并将该声音信号转换成声压信号；第一模拟放大电路，用于放大来自第一MIC的声压信号；其特征在于，该装置还包括：A device for wireless terminal voice front-end processing, the device includes a first microphone MIC for receiving a sound signal from a voice input direction of a wireless terminal and converting the sound signal into a sound pressure signal; a first analog amplifying circuit for Amplify the sound pressure signal from the first MIC; It is characterized in that the device also includes:
第二MIC，用于接收来自无线终端的语音输入方向以外的方向的声音信号并将该声音信号转换成声压信号；The second MIC is used to receive a sound signal from a direction other than the voice input direction of the wireless terminal and convert the sound signal into a sound pressure signal;
第二模拟放大电路，用于放大来自第二MIC的声压信号；The second analog amplifying circuit is used to amplify the sound pressure signal from the second MIC;
差分处理电路，用于接收分别来自第一模拟放大电路和第二模拟放大电路放大后的输出声压信号，并对两路声压信号进行差分处理。The differential processing circuit is used to receive the amplified output sound pressure signals from the first analog amplifier circuit and the second analog amplifier circuit respectively, and perform differential processing on the two channels of sound pressure signals.
该装置所述第一MIC的受话端与第二MIC的受话端面向相反的方向。In the device, the receiving end of the first MIC and the receiving end of the second MIC face in opposite directions.
该装置所述第一模拟放大电路的放大倍数与第二模拟放大电路的放大倍数相等。The magnification of the first analog amplifying circuit of the device is equal to the magnification of the second analog amplifying circuit.
该装置所述差分处理电路包括第一电阻R5、第二电阻R6、第三电阻R7、第四电阻R8和运算放大器A3；The differential processing circuit of the device includes a first resistor R5, a second resistor R6, a third resistor R7, a fourth resistor R8 and an operational amplifier A3;
第一电阻R5的一端连接至第一模拟放大电路输出端，另一端同时连接在运算放大器A3的反向输入端和第三电阻R7的一端，第三电阻R7的另一端接地；One end of the first resistor R5 is connected to the output end of the first analog amplifying circuit, and the other end is simultaneously connected to the inverting input end of the operational amplifier A3 and one end of the third resistor R7, and the other end of the third resistor R7 is grounded;
第二电阻R6的一端连接至第二模拟放大电路输出端，另一端同时连接在运算放大器A3的同向输入端和第四电阻R8的一端，电阻R8的另一端连接在运算放大器A3的输出端上；One end of the second resistor R6 is connected to the output end of the second analog amplifier circuit, and the other end is simultaneously connected to the same input end of the operational amplifier A3 and one end of the fourth resistor R8, and the other end of the resistor R8 is connected to the output end of the operational amplifier A3 superior;
其中，第一电阻R5与第二电阻R6阻值相等；第三电阻R7与第四电阻R8阻值相等。Wherein, the resistance values of the first resistor R5 and the second resistor R6 are equal; the resistance values of the third resistor R7 and the fourth resistor R8 are equal.
该装置所述运算放大器A3为单电源供电运算放大器。The operational amplifier A3 of the device is a single power supply operational amplifier.
该装置所述差分处理电路是数字信号处理器DSP。The differential processing circuit of the device is a digital signal processor DSP.
由上述技术方案可见，本发明方法采用两支MIC接收声音信号并将该声音信号转换成声压信号后输出，其中一支MIC主要输出人声声压信号，另一支MIC主要输出环境噪声声压信号；并分别对输出的人声声压信号和环境噪声声压信号进行放大，之后再对放大后的结果进行差分处理后送入音频编码器。本发明方法提高了无线终端在强噪声环境下的通话质量。本发明装置采用两支MIC、两套模拟放大电路和一套差分处理电路来完成对无线终端语音前端的处理。本发明装置结构简单，方便灵活地实现了分离无线终端MIC接收到的人声声压信号和环境噪声声压信号，尤其能保证无线终端在强噪声环境下的通话质量。It can be seen from the above technical scheme that the method of the present invention adopts two MICs to receive sound signals and convert the sound signals into sound pressure signals for output, wherein one MIC mainly outputs human voice sound pressure signals, and the other MIC mainly outputs environmental noise sounds. pressure signal; and respectively amplify the output human voice sound pressure signal and environmental noise sound pressure signal, and then send the amplified result to the audio encoder after differential processing. The method of the invention improves the communication quality of the wireless terminal in the strong noise environment. The device of the invention uses two MICs, two sets of analog amplifier circuits and a set of differential processing circuits to complete the processing of the voice front end of the wireless terminal. The device of the invention has a simple structure, conveniently and flexibly realizes the separation of the human voice sound pressure signal and the environmental noise sound pressure signal received by the wireless terminal MIC, and can especially ensure the communication quality of the wireless terminal in a strong noise environment.
附图说明Description of drawings
图1是现有技术无线终端语音处理电路图；Fig. 1 is a prior art wireless terminal voice processing circuit diagram;
图2是本发明无线终端语音处理框图；Fig. 2 is a block diagram of wireless terminal voice processing of the present invention;
图3是本发明无线终端语音处理电路结构示意图。FIG. 3 is a schematic structural diagram of a voice processing circuit of a wireless terminal according to the present invention.
具体实施方式Detailed ways
本发明的核心思想是：采用两支MIC来接收声音信号，其中一支MIC主要接收人声声音信号并将该信号转换成声压信号，经过模拟放大电路放大后输入差分处理电路的一端；另一支MIC主要接收环境噪声声音信号并将该信号转换成噪声声压信号，经过模拟放大电路后输入差分处理电路的另一端；差分电路对两个输入信号进行差分处理，大大削弱了环境噪声声压信号，使差分处理电路的输出声压信号主要是人声声压信号，这样送入音频编码器的声压信号主要是人声声压信号。通过这样的处理，保证了通话双方的通话质量。The core idea of the present invention is: adopt two MICs to receive the sound signal, wherein one MIC mainly receives the vocal sound signal and converts the signal into a sound pressure signal, which is amplified by the analog amplifier circuit and input to one end of the differential processing circuit; A MIC mainly receives the environmental noise sound signal and converts the signal into a noise sound pressure signal, which is input to the other end of the differential processing circuit after passing through the analog amplifier circuit; the differential circuit performs differential processing on the two input signals, which greatly weakens the environmental noise. Pressure signal, so that the output sound pressure signal of the differential processing circuit is mainly the human voice sound pressure signal, so the sound pressure signal sent to the audio encoder is mainly the human voice sound pressure signal. Through such processing, the call quality of both parties in the call is guaranteed.
图2是本发明无线终端语音处理框图，从图2中可见，本发明装置除了包括现有的一支MIC1和一套模拟放大电路1外，还包括另一支MIC2；另一套模拟放大电路2和一套差分处理电路。Fig. 2 is the wireless terminal voice processing block diagram of the present invention, as can be seen from Fig. 2, the device of the present invention except comprising existing MIC1 and a cover of analog amplifying circuit 1, also comprises another MIC2; Another cover of analog amplifying circuit 2 and a set of differential processing circuits.
MIC1，用于接收声音信号并将该声音信号转换成声压信号后输出，接收的主要是声音信号中的人声声音信号；模拟放大电路1，用于放大来自MIC1的声压信号；MIC1 is used to receive the sound signal and convert the sound signal into a sound pressure signal and output it, mainly receiving the human voice sound signal in the sound signal; the analog amplifier circuit 1 is used to amplify the sound pressure signal from MIC1;
MIC2，用于接收声音信号并将该声音信号转换成声压信号后输出，接收的主要是声音信号中的环境噪声声音信号；MIC2 is used to receive the sound signal and convert the sound signal into a sound pressure signal and output it, mainly receiving the environmental noise sound signal in the sound signal;
模拟放大电路2，用于放大来自MIC2的声压信号；Analog amplifier circuit 2, for amplifying the sound pressure signal from MIC2;
差分处理电路，用于接收分别来自模拟放大电路1和模拟放大电路2放大后的输出声压信号，并对两种声压信号进行差分处理。The differential processing circuit is used to receive the amplified output sound pressure signals from the analog amplifier circuit 1 and the analog amplifier circuit 2 respectively, and perform differential processing on the two sound pressure signals.
这里，为了保证其中一支MIC1主要接收人声声音信号，而另一支MIC2主要接收环境噪声声音信号，可以采用两支MIC背靠背安装的方式，比如，MIC1接收声音信号的受话端对着人，接收来自人声方向的声音信号，与现有MIC的安装方向一致，而MIC2与MIC1背靠背安装，MIC2接收声音信号的受话端背对着人，即MIC1的受话端与MIC2的受话端面向相反的方向。由于人声的方向性较强，那么，正对人的MIC1接收到的人声声音信号较强，而背面的MIC2接收到的人声声音信号较弱；而环境噪声的方向性较差，所以MIC1和MIC2接收到的环境噪声声音相差不大。Here, in order to ensure that one of the MIC1 mainly receives the human voice signal, while the other MIC2 mainly receives the environmental noise sound signal, two MICs can be installed back to back, for example, the receiving end of the MIC1 receiving the sound signal faces the human , to receive the sound signal from the direction of the human voice, which is consistent with the installation direction of the existing MIC, while MIC2 and MIC1 are installed back to back, and the receiving end of MIC2 receiving the sound signal is facing away from the person, that is, the receiving end of MIC1 and the receiving end of MIC2 The ends face in opposite directions. Since the directionality of the human voice is strong, the human voice signal received by the MIC1 facing the person is strong, while the human voice signal received by the MIC2 on the back is weak; and the directionality of the environmental noise is poor, so The environmental noises received by MIC1 and MIC2 are not much different.
下面参照图2，对本发明方法描述如下：Below with reference to Fig. 2, the inventive method is described as follows:
首先，分别用MIC1和MIC2输出的不同的声压信号：设MIC1输出的声压信号为Vi1，其中人声声压信号为V1，环境噪声声压信号为Vcm1；设MIC2输出的声压信号为Vi2，其中人声声压信号为V2，环境噪声声压信号为Vcm2。按照上述的MIC1、MIC2安装方式，那么，V1＞＞V2，Vcm1≈Vcm2。First, use different sound pressure signals output by MIC1 and MIC2 respectively: Let the sound pressure signal output by MIC1 be Vi1, where the sound pressure signal of human voice is V1, and the sound pressure signal of environmental noise is Vcm1; let the sound pressure signal output by MIC2 be Vi2, where the human voice sound pressure signal is V2, and the environmental noise sound pressure signal is Vcm2. According to the above installation method of MIC1 and MIC2, then, V1>>V2, Vcm1≈Vcm2.
然后，分别对Vi1和Vi2进行放大，这里，模拟放大电路1与模拟放大电路2的参数可以一致，即两个电路的放大倍数一致，即β1＝β2＝β。Vi1经过模拟放大电路1进行放大后输出声压信号为Vo1，Vi2经过模拟放大电路2进行放大后输出声压信号为Vo2，Then, Vi1 and Vi2 are respectively amplified. Here, the parameters of the analog amplifier circuit 1 and the analog amplifier circuit 2 can be consistent, that is, the amplification factors of the two circuits are consistent, that is, β1=β2=β. After Vi1 is amplified by the analog amplifier circuit 1, the output sound pressure signal is Vo1, and after Vi2 is amplified by the analog amplifier circuit 2, the output sound pressure signal is Vo2.
则有，Vo1＝β(V1+Vcm1)，Vo2＝β(V2+Vcm2)Then there is, Vo1=β(V1+Vcm1), Vo2=β(V2+Vcm2)
最后，将模拟放大电路1的输出声压信号Vo1输入差分处理电路的反向输入端，即+端；将模拟放大电路2的输出声压信号Vo2输入差分处理电路的同向输入端，即-端，这里假设差分处理电路的运算放大器A3的放大倍数为β3，则Vo＝β3×(Vo1-Vo2)，Finally, the output sound pressure signal Vo1 of the analog amplifier circuit 1 is input to the reverse input terminal of the differential processing circuit, that is, the + terminal; the output sound pressure signal Vo2 of the analog amplifier circuit 2 is input to the same input terminal of the differential processing circuit, namely - Assuming here that the amplification factor of the operational amplifier A3 of the differential processing circuit is β3, then Vo=β3×(Vo1-Vo2),
即Vo＝β3×(β(V1+Vcm1)-β(V2+Vcm2))，That is, Vo=β3×(β(V1+Vcm1)-β(V2+Vcm2)),
也即Vo≈β3×(β×V1-β×V2)≈β3×β×V1 ...(2)That is, Vo≈β3×(β×V1-β×V2)≈β3×β×V1 ...(2)
从公式(2)可以看出，经过本发明方法及其装置的处理后，送入音频编码器的声压信号几乎只有MIC1输出的人声声压信号V1经过放大处理后的声压信号，而环境噪声声压信号在经过差分处理电路后被大大抵消，这样就保证了无线终端即使在强噪声环境下，也能具有良好的通话质量，通话者也不必再提高嗓门费力地通话了。As can be seen from formula (2), after the processing of the inventive method and its device, the sound pressure signal sent into the audio encoder almost only has the sound pressure signal of the human voice sound pressure signal V1 output by MIC1 through the amplified sound pressure signal, and The sound pressure signal of ambient noise is greatly canceled after passing through the differential processing circuit, which ensures that the wireless terminal can have a good call quality even in a strong noise environment, and the caller does not need to raise his voice to talk laboriously.
另外，对于差分处理电路，还可以采用数字信号处理器(DSP)来实现：In addition, for the differential processing circuit, a digital signal processor (DSP) can also be used to realize:
将模拟放大电路1的输出声压信号Vo1和模拟放大电路2的输出声压信号Vo2输入DSP的模拟/数字转换(A/D)端口，然后DSP对转换后的Vo1和Vo2数字信号进行数字差分处理，处理方法也是Vo＝β3×(Vo1-Vo2)，只是这里的信号都是数字信号。最后DSP将处理后的Vo数字信号经过数字/模拟转换(D/A)后输出给音频编码器。这样处理能更好地保证信号精度。The output sound pressure signal Vo1 of the analog amplifier circuit 1 and the output sound pressure signal Vo2 of the analog amplifier circuit 2 are input to the analog/digital conversion (A/D) port of the DSP, and then the DSP performs digital difference on the converted Vo1 and Vo2 digital signals Processing, the processing method is also Vo=β3×(Vo1-Vo2), but the signals here are all digital signals. Finally, the DSP outputs the processed Vo digital signal to the audio encoder after digital/analog conversion (D/A). This processing can better guarantee the signal accuracy.
这里需要说明一点：A/D转换和D/A转换可以是采用DSP自身带有的转换功能，也可以是采用专用的A/D转换芯片或D/A转换芯片。One point needs to be explained here: A/D conversion and D/A conversion can use the conversion function of DSP itself, or use a dedicated A/D conversion chip or D/A conversion chip.
图3是本发明无线终端语音处理电路结构示意图，作为一实施例，下面对本发明方法及其装置进行详细描述：Fig. 3 is a schematic structural diagram of the voice processing circuit of the wireless terminal of the present invention. As an embodiment, the method and the device of the present invention are described in detail below:
图3中包括两支麦克风，MIC1和MIC2，其中MIC1方向对着人，主要用于接收人声声音信号并将该信号转换成人声声压信号后输出；MIC2与MIC1背靠背安装，主要用于接收环境噪声声音信号并将该信号转换成声压信号后输出。Figure 3 includes two microphones, MIC1 and MIC2, in which MIC1 is facing the person, and is mainly used to receive the human voice signal and convert the signal to the human voice sound pressure signal for output; MIC2 and MIC1 are installed back to back, mainly for receiving The environmental noise sound signal is converted into a sound pressure signal and output.
图3中还包括，模拟放大电路1，用于放大MIC1输出的人声声压信号，模拟放大电路2，用于放大MIC2输出的环境噪声声压信号。假设模拟放大电路1与模拟放大电路2的电路参数一致：Figure 3 also includes an analog amplifier circuit 1 for amplifying the human voice sound pressure signal output by MIC1, and an analog amplifier circuit 2 for amplifying the environmental noise sound pressure signal output by MIC2. Assume that the circuit parameters of analog amplifier circuit 1 and analog amplifier circuit 2 are the same:
电阻R14或R24与电源VCC相连接，为MIC1或MIC2提供偏置电压；电阻R11＝电阻R12，电阻R11和电阻R12对电源VCC分压，为运算放大器A1提供偏置工作电压，且此时运算放大器的动态范围最大；同样，电阻R21＝电阻R22，电阻R21和电阻R22对电源VCC分压，为运算放大器A2提供偏置工作电压，且此时运算放大器的动态范围最大。Resistor R14 or R24 is connected with power supply VCC to provide bias voltage for MIC1 or MIC2; resistor R11=resistor R12, resistor R11 and resistor R12 divide the power supply VCC to provide bias operating voltage for operational amplifier A1, and at this time the operation The dynamic range of the amplifier is the largest; similarly, resistor R21=resistor R22, the resistor R21 and the resistor R22 divide the voltage of the power supply VCC, and provide the bias operating voltage for the operational amplifier A2, and the dynamic range of the operational amplifier is the largest at this time.
电容C11或电容C21用于隔直，电容C12或电容C22用于滤波；模拟放大电路1的放大倍数是电阻Rf1与电阻R13之比，即放大倍数β1＝Rf1/R13；模拟放大电路2的放大倍数是电阻Rf2与电阻R23之比，即放大倍数β2＝Rf2/R23。由于两套模拟放大电路参数保持一致，那么，Capacitor C11 or capacitor C21 is used for DC blocking, capacitor C12 or capacitor C22 is used for filtering; the magnification of the analog amplifier circuit 1 is the ratio of the resistor Rf1 to the resistor R13, that is, the magnification factor β1=Rf1/R13; the amplification of the analog amplifier circuit 2 The multiple is the ratio of the resistor Rf2 to the resistor R23, that is, the magnification factor β2=Rf2/R23. Since the parameters of the two sets of analog amplifier circuits are consistent, then,
β1＝β2＝Rf1/R13＝Rf2/R23，这里，设β1＝β2＝ββ1=β2=Rf1/R13=Rf2/R23, here, set β1=β2=β
之外，图3中还包括差分处理电路，用于对分别来自模拟放大电路1和模拟放大电路路2的输出声压信号进行差分处理，经过差分处理后，保留人声声压信号，抵消环境噪声声压信号。In addition, Fig. 3 also includes a differential processing circuit, which is used to perform differential processing on the output sound pressure signals from the analog amplifier circuit 1 and the analog amplifier circuit 2 respectively. After differential processing, the human voice sound pressure signal is retained to offset the environmental Noise sound pressure signal.
差分处理电路中电阻R5的一端接收来自模拟放大电路1输出声压信号，另一端同时连接在运算放大器A3的反向输入端和电阻R7的一端，电阻R7的另一端接地；One end of the resistor R5 in the differential processing circuit receives the output sound pressure signal from the analog amplifier circuit 1, and the other end is simultaneously connected to the inverting input end of the operational amplifier A3 and one end of the resistor R7, and the other end of the resistor R7 is grounded;
电阻R6的一端接收来自模拟放大电路2输出声压信号，另一端同时连接在运算放大器A3的同向输入端和电阻R8的一端，电阻R8的另一端连接在运算放大器A3的输出端上；One end of the resistor R6 receives the output sound pressure signal from the analog amplifying circuit 2, and the other end is simultaneously connected to the same input end of the operational amplifier A3 and one end of the resistor R8, and the other end of the resistor R8 is connected to the output end of the operational amplifier A3;
其中，电阻R5＝电阻R6，电阻R7＝电阻R8，运算放大器A3的放大倍数β3＝R7/R5。Wherein, resistor R5=resistor R6, resistor R7=resistor R8, amplification factor β3 of operational amplifier A3=R7/R5.
假设MIC1输出的声压信号为Vi1，其中人声声压信号为V1，环境噪声声压信号为Vcm1；MIC2输出的声压信号为Vi2，其中人声声压信号为V2，环境噪声声压信号为Vcm2。由于MIC1方向对着人，而MIC2与MIC1背靠背安装，那么有，Assume that the sound pressure signal output by MIC1 is Vi1, where the sound pressure signal of human voice is V1, and the sound pressure signal of environmental noise is Vcm1; the sound pressure signal output by MIC2 is Vi2, where the sound pressure signal of human voice is V2, and the sound pressure signal of environmental noise is Vcm1. is Vcm2. Since MIC1 faces people, and MIC2 and MIC1 are installed back to back, then yes,
V1＞＞V2，Vcm1≈Vcm2。V1>>V2, Vcm1≈Vcm2.
分别将Vi1和Vi2输入给模拟放大电路1和模拟放大电路2，则有，Input Vi1 and Vi2 to analog amplifier circuit 1 and analog amplifier circuit 2 respectively, then there are,
Vo1＝β(V1+Vcm1)+VCC/2，Vo2＝β(V2+Vcm2)+VCC/2Vo1=β(V1+Vcm1)+VCC/2, Vo2=β(V2+Vcm2)+VCC/2
最后，将模拟放大电路1的输出电压Vo1输入差分处理电路的运算放大器A3的反向输入端，即+端；将模拟放大电路2的输出电压Vo2输入差分处理电路的运算放大器A3的同向输入端，即-端，则Finally, the output voltage Vo1 of the analog amplifier circuit 1 is input to the inverting input terminal of the operational amplifier A3 of the differential processing circuit, that is, the + terminal; the output voltage Vo2 of the analog amplifier circuit 2 is input to the same input of the operational amplifier A3 of the differential processing circuit end, that is - end, then
Vo＝β3×(Vo1-Vo2)，Vo=β3×(Vo1-Vo2),
即Vo＝β3×(β(V1+Vcm1)+VCC/2-β(V2+Vcm2)-VCC/2)，That is Vo=β3×(β(V1+Vcm1)+VCC/2-β(V2+Vcm2)-VCC/2),
也即Vo≈β3×(β×V1-β×V2)≈β3×β×V1That is, Vo≈β3×(β×V1-β×V2)≈β3×β×V1
这样，经过本发明方法及其装置的处理后，送入音频编码器的声压信号几乎只有MIC1输出的人声声压信号V1经过放大处理后的声压信号，而环境噪声信号在经过差分处理电路后被大大抵消，这样保证了无线终端即使在强噪声环境下，也能具有良好的通话质量，通话者也不必再提高嗓门费力地通话了。In this way, after being processed by the method of the present invention and its device, the sound pressure signal sent into the audio encoder is almost only the amplified sound pressure signal of the human voice sound pressure signal V1 output by MIC1, while the environmental noise signal is processed by differential processing. The back of the circuit is greatly offset, which ensures that the wireless terminal can have good call quality even in a strong noise environment, and the caller does not need to raise his voice to talk laboriously.
为了保证差分处理电路的精度，这里运算放大器A3为单电源供电运算放大器，例如德州仪器(TI)公司的TLV2472运算放大器。同时为了保证差分处理电路的正常工作，必须保证电阻R5＝电阻R6，电阻R7＝电阻R8。In order to ensure the accuracy of the differential processing circuit, the operational amplifier A3 here is a single power supply operational amplifier, such as the TLV2472 operational amplifier of Texas Instruments (TI). At the same time, in order to ensure the normal operation of the differential processing circuit, it must be ensured that the resistor R5=the resistor R6, and the resistor R7=the resistor R8.
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2004101035786A CN100407293C (en) | 2004-12-30 | 2004-12-30 | Method and device for voice processing of wireless terminal |
| PCT/CN2005/002399 WO2006069546A1 (en) | 2004-12-30 | 2005-12-30 | A speech processing approach and device of a wireless terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2004101035786A CN100407293C (en) | 2004-12-30 | 2004-12-30 | Method and device for voice processing of wireless terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1797544A true CN1797544A (en) | 2006-07-05 |
| CN100407293C CN100407293C (en) | 2008-07-30 |
Family
ID=36614510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2004101035786A Expired - Lifetime CN100407293C (en) | 2004-12-30 | 2004-12-30 | Method and device for voice processing of wireless terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100407293C (en) |
| WO (1) | WO2006069546A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188875A (en) * | 2006-10-27 | 2008-05-28 | 安华高科技无线Ip（新加坡）私人有限公司 | Piezoelectric microphones |
| WO2013107307A1 (en) * | 2012-01-16 | 2013-07-25 | 华为终端有限公司 | Noise reduction method and device |
| US8824698B2 (en) | 2008-05-20 | 2014-09-02 | Funai Electric Advanced Applied Technology Research Institute Inc. | Integrated circuit device, voice input device and information processing system |
| CN104505099A (en) * | 2014-12-08 | 2015-04-08 | 北京云知声信息技术有限公司 | Method and equipment for removing known interference in voice signal |
| WO2015131634A1 (en) * | 2014-10-11 | 2015-09-11 | 中兴通讯股份有限公司 | Audio noise reduction method and terminal |
| CN105049970A (en) * | 2014-04-15 | 2015-11-11 | 快捷半导体(苏州)有限公司 | AUDIO ACCESSORY system, advanced slave circuit and audio jack ACCESSORY COMMUNICATION method |
| CN105635866A (en) * | 2016-02-26 | 2016-06-01 | 深圳市优科威科技有限公司 | Method and device for removing noise by adopting multiple microphones |
| CN107331407A (en) * | 2017-06-21 | 2017-11-07 | 深圳市泰衡诺科技有限公司 | Descending call noise-reduction method and device |
| CN108337353A (en) * | 2014-07-28 | 2018-07-27 | 华为技术有限公司 | The audio signal processing method and equipment of communication equipment |
| CN111356908A (en) * | 2017-09-29 | 2020-06-30 | 深圳传音通讯有限公司 | Noise reduction method and terminal |
| CN112086101A (en) * | 2020-08-19 | 2020-12-15 | 广州亚美智造科技有限公司 | Noise reduction circuit, voice recognition module and electronic equipment |
| CN114279625A (en) * | 2021-12-03 | 2022-04-05 | 北京晨晶精仪电子有限公司 | Vacuum degree detection circuit, vacuum degree detection method and vacuum gauge |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109378009B (en) * | 2018-09-21 | 2023-06-27 | 中国航空无线电电子研究所 | Airborne warning voice output device |
| CN118826736A (en) * | 2024-07-09 | 2024-10-22 | 武汉市亚桥国际贸易有限公司 | A data processing method and system based on dual ADC |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6145638A (en) * | 1984-08-09 | 1986-03-05 | Mitsubishi Electric Corp | Portable type radio set |
| JPH04216597A (en) * | 1990-12-17 | 1992-08-06 | Nec Eng Ltd | Background noise eliminating circuit of voice recognition device |
| CN1209889C (en) * | 2003-04-21 | 2005-07-06 | 徐忠义 | Phoneme background noise inhibitor |
| JP2004361938A (en) * | 2003-05-15 | 2004-12-24 | Takenaka Komuten Co Ltd | Noise reduction device |
-
2004
- 2004-12-30 CN CN2004101035786A patent/CN100407293C/en not_active Expired - Lifetime
-
2005
- 2005-12-30 WO PCT/CN2005/002399 patent/WO2006069546A1/en not_active Application Discontinuation
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8369555B2 (en) | 2006-10-27 | 2013-02-05 | Avago Technologies Wireless Ip (Singapore) Pte. Ltd. | Piezoelectric microphones |
| CN101188875A (en) * | 2006-10-27 | 2008-05-28 | 安华高科技无线Ip（新加坡）私人有限公司 | Piezoelectric microphones |
| CN101188875B (en) * | 2006-10-27 | 2016-06-08 | 安华高科技通用Ip(新加坡)公司 | Piezoelectric microphones |
| US8824698B2 (en) | 2008-05-20 | 2014-09-02 | Funai Electric Advanced Applied Technology Research Institute Inc. | Integrated circuit device, voice input device and information processing system |
| WO2013107307A1 (en) * | 2012-01-16 | 2013-07-25 | 华为终端有限公司 | Noise reduction method and device |
| CN105049970A (en) * | 2014-04-15 | 2015-11-11 | 快捷半导体(苏州)有限公司 | AUDIO ACCESSORY system, advanced slave circuit and audio jack ACCESSORY COMMUNICATION method |
| CN105049970B (en) * | 2014-04-15 | 2019-02-15 | 快捷半导体(苏州)有限公司 | It is attachment earphone system, advanced from circuit and audio jack accessory communication method |
| CN108337353A (en) * | 2014-07-28 | 2018-07-27 | 华为技术有限公司 | The audio signal processing method and equipment of communication equipment |
| CN108337353B (en) * | 2014-07-28 | 2021-08-03 | 荣耀终端有限公司 | Sound signal processing method and device for communication equipment |
| WO2015131634A1 (en) * | 2014-10-11 | 2015-09-11 | 中兴通讯股份有限公司 | Audio noise reduction method and terminal |
| CN104505099A (en) * | 2014-12-08 | 2015-04-08 | 北京云知声信息技术有限公司 | Method and equipment for removing known interference in voice signal |
| CN105635866A (en) * | 2016-02-26 | 2016-06-01 | 深圳市优科威科技有限公司 | Method and device for removing noise by adopting multiple microphones |
| CN107331407A (en) * | 2017-06-21 | 2017-11-07 | 深圳市泰衡诺科技有限公司 | Descending call noise-reduction method and device |
| CN111356908A (en) * | 2017-09-29 | 2020-06-30 | 深圳传音通讯有限公司 | Noise reduction method and terminal |
| CN112086101A (en) * | 2020-08-19 | 2020-12-15 | 广州亚美智造科技有限公司 | Noise reduction circuit, voice recognition module and electronic equipment |
| CN114279625A (en) * | 2021-12-03 | 2022-04-05 | 北京晨晶精仪电子有限公司 | Vacuum degree detection circuit, vacuum degree detection method and vacuum gauge |
| CN114279625B (en) * | 2021-12-03 | 2024-05-10 | 北京晨晶电子有限公司 | Vacuum degree detection circuit, vacuum degree detection method and vacuum gauge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100407293C (en) | 2008-07-30 |
| WO2006069546A1 (en) | 2006-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1797544A (en) | Method and device for voice process at wireless terminal | |
| ES2719323T3 (en) | Mobile phone and method to process call signal from it | |
| CN101047408A (en) | Digital radio microphone system | |
| US9792926B2 (en) | Use of sensors for noise suppression in a mobile communication device | |
| CN1976501A (en) | Apparatus and method for transmitting/receiving data of mobile communication terminal | |
| CN211792016U (en) | Noise reduction voice device and electronic device | |
| CN105530391A (en) | Method and system for perfecting hands-free call echo of mobile terminal | |
| CN101056322A (en) | A device and method for overlapping the background sound at the mobile communication terminal | |
| CN106453792B (en) | voice processing method and device | |
| CN106953961A (en) | A mobile phone voice application device with dual microphones and its application method | |
| CA2213429A1 (en) | Intelligent acoustic systems peripheral | |
| CN1874389A (en) | Terminal for broadcast and literal speech communicationg method for the same | |
| CN114724565A (en) | Call noise reduction method, call noise reduction device and headset based on voiceprint recognition | |
| CN1779780A (en) | Audio mixing method based on portable terminal | |
| CN1628453A (en) | Trans mitter-receiver | |
| CN212572939U (en) | Linear microphone array device based on DSP | |
| CN205666067U (en) | Microphone array speech enhancement circuit | |
| CN1926773A (en) | Circuit board for mobile communication terminal having ultrasonic wave speaker system | |
| CN1237846C (en) | Frequency conversion micro platform sound device | |
| TW201304565A (en) | Portable device with hearing aid | |
| CN1968545A (en) | Voice recording device and voice audio compiler | |
| CN101771390B (en) | Sound output and input system and its volume output adjustment method | |
| CN201278553Y (en) | Telephone terminal for meeting | |
| CN1233196C (en) | It has a hands-free handset device that provides mobile phones and external Bluetooth modules at the same time | |
| CN207460500U (en) | Microphone structure for mobile phone instant voice translation for travel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080730 |