WO2014180287A1 - 一种移动终端的耳机线控电路及线控方法 - Google Patents

一种移动终端的耳机线控电路及线控方法 Download PDF

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Publication number
WO2014180287A1
WO2014180287A1 PCT/CN2014/076751 CN2014076751W WO2014180287A1 WO 2014180287 A1 WO2014180287 A1 WO 2014180287A1 CN 2014076751 W CN2014076751 W CN 2014076751W WO 2014180287 A1 WO2014180287 A1 WO 2014180287A1
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mobile terminal
pwm signal
pwm
frequency
resistor
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PCT/CN2014/076751
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English (en)
French (fr)
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陈彪
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广东欧珀移动通信有限公司
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Priority to US14/889,268 priority Critical patent/US9654859B2/en
Publication of WO2014180287A1 publication Critical patent/WO2014180287A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the invention relates to a headset wire control circuit and a wire control method for a mobile terminal such as a mobile phone and a tablet computer.
  • the technical problem to be solved by the present invention is to provide a headphone wire control circuit and a wire control method for a mobile terminal, which adopts a PWM signal transmitting different frequency signals to transmit key information, thereby avoiding POP sound during a call and improving call quality.
  • the present invention provides a headphone wire control circuit of a mobile terminal, a headphone wire control circuit of the mobile terminal, including a headphone end circuit and a mobile terminal end circuit connected by a signal line, the headphone end circuit
  • the utility model comprises a connected headphone MCU microcontroller and an attenuation and microphone circuit.
  • the mobile terminal circuit comprises an audio analog input channel and an amplifier connected in parallel, the amplifier is connected with a mobile terminal MCU microcontroller through a line, and the mobile terminal MCU micro control
  • the device is connected to the processor CPU through a line, and the headphone MCU microcontroller has a built-in button detection module and a PWM module, and the mobile terminal MCU microcontroller has a PWM signal detection and recognition module and a CPU communication interface module.
  • the attenuation and microphone circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3 and a microphone, and the resistor R1, the capacitor C1, the resistor R2, the resistor R3 and the capacitor C2 are connected in series, the capacitor C2 is grounded, and the microphone One end is connected to the input end of the resistor R3, and the other end is grounded. One end of the capacitor C3 is connected to the input end of the resistor R3, and the other end is connected to the microphone.
  • An ADC module is disposed in the audio analog input channel, and a resistor R4 is connected to the input end of the ADC module.
  • the PWM module is a PWM module capable of transmitting a PWM signal of a frequency of 100 kHz to 300 KHz.
  • the invention also provides a wire control method for a mobile terminal wire-controlled earphone, comprising the following steps:
  • the headphone MCU microcontroller detects that a button is pressed, and the PWM module sends a corresponding PWM signal;
  • PWM The signal enters the attenuation and the microphone circuit, and the PWM signal is attenuated to less than 100mV and superimposed with the voice signal generated by the microphone, and then enters the audio analog input channel and the amplifier;
  • the voice signal in the audio analog input channel whose frequency is below 20KHz is restored; the amplifier amplifies the PWM signal with a frequency above 100KHz and sends the amplified PWM signal to the MCU microcontroller of the mobile terminal;
  • the mobile terminal MCU microcontroller detects and recognizes the frequency of the PWM signal, and obtains a pressed button according to the PWM signal frequency, and the processor CPU performs a corresponding function according to the corresponding button.
  • the PWM signal sent by the PWM module is a PWM signal having a frequency of 100 kHz to 300 KHz.
  • the detecting that the button is pressed specifically includes: when the same button is pressed and released, each of the PWM signals having a different frequency is sent, and the frequency of the PWM signal sent when the different buttons are pressed is different, and the different buttons are pressed.
  • the frequency of the PWM signal sent when released is the same.
  • the invention adopts the PWM signal of different frequencies to transmit the button information, and solves the traditional four-stage wire-controlled earphone with the offset voltage-dividing mode detecting button, and pressing the button during the call causes the other party to hear the POP sound problem and improve the call quality. And user experience.
  • the conventional four-segment line-controlled earphone that uses the offset voltage-dividing method to detect the button the number of buttons can generally only be less than 10 due to the accuracy of the ADC and the prevention of false detection, and the technical solution of the present invention, the number of buttons Can do more than 10.
  • FIG. 1 is a schematic diagram of a circuit principle of the present invention
  • FIG. 2 is a schematic flow chart of the principle of the present invention.
  • a headphone wire control circuit for a mobile terminal a headphone wire control circuit of a mobile terminal, comprising a headphone end circuit and a mobile terminal end circuit connected by a signal line, the headphone end circuit comprising a connected headphone end MCU microcontroller
  • the mobile terminal circuit includes an audio analog input channel and an amplifier connected in parallel, the amplifier is connected with a mobile terminal MCU microcontroller through a line, and the mobile terminal MCU microcontroller is connected to the processor CPU through a line, the earphone
  • the MCU microcontroller has a built-in button detection module and a PWM module, and the mobile terminal MCU microcontroller has a PWM signal detection and recognition module and a CPU communication interface module.
  • the PWM module is a pulse width modulation module.
  • the button detection module in the headphone MCU microcontroller establishes a connection with the corresponding button, the number of buttons can be flexibly set, and the button detection module is used to detect whether a button is pressed.
  • the PWM module is used to send PWM signals, especially the transmission frequency is PWM signal from 100KHz to 300 KHz.
  • the amplifier is a conventional amplifier that can be used to amplify PWM signals above 100KHz.
  • the attenuation and microphone circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3 and a microphone.
  • the resistor R1, the capacitor C1, the resistor R2, the resistor R3 and the capacitor C2 are connected in series, the capacitor C2 is grounded, and the microphone is connected to one end.
  • the input end of the resistor R3 is connected, and the other end is grounded.
  • One end of the capacitor C3 is connected to the input end of the resistor R3, and the other end is connected to the microphone.
  • the attenuation and microphone circuit can effectively attenuate the PWM signal and attenuate the PWM signal to Below 100mV, the attenuated PWM signal is superimposed on the voice signal generated by the microphone and then transmitted to the mobile terminal through the signal line.
  • an analog-to-digital conversion ADC module is disposed in the audio analog input channel, and a resistor R4 is connected to the input end of the ADC module.
  • the audio analog input channel can filter and convert the PWM signal with the frequency below 20KHz, convert the analog signal into a digital signal, and finally restore the voice signal output.
  • the invention also provides a wire control method for a mobile terminal wire headset, comprising the following steps:
  • the headphone MCU microcontroller detects that a button is pressed, and the PWM module sends a corresponding PWM signal.
  • the button detection module in the MCU microcontroller of the headphone end detects whether a button is pressed in real time, and the PWM module sends a corresponding PWM signal according to the pressing and releasing of the button.
  • the detection of a button press specifically includes, when the same button is pressed and released, each sends a PWM signal having a different frequency, and the frequency of the PWM signal sent when different buttons are pressed is different, and the different buttons are pressed and released.
  • the frequency of the PWM signal sent is the same.
  • the PWM signal sent by the PWM module is a PWM signal with a frequency between 100KHz and 300KHz, and the voltage of the initial PWM signal sent by the PWM module is in the range of 1.7V to 2.5V.
  • the frequency of transmitting the corresponding signal is F1
  • the frequency of transmitting the corresponding signal is F2
  • the values of F1 and F2 are different.
  • the PWM signal will be sent again when the button is released.
  • the frequency of transmitting the corresponding signal when the button K1 is pressed and released is F0
  • the frequency of transmitting the corresponding signal when the button K12 is pressed and released is F0
  • the F0 is different from F1
  • F0 and F2 are also different.
  • the frequency of the corresponding signal pressed by each button is different, and the frequency of the corresponding signal is the same when each button is released.
  • the PWM signal enters the attenuation and the microphone circuit, and the PWM signal is attenuated to below 100 mV and superimposed with the voice signal generated by the microphone, and then enters the audio analog input channel and the amplifier. That is, the attenuation and microphone circuit attenuate the PWM signal with the original voltage amplitude between 1.7 and 2.5V to 100. After mV or less, it is superimposed with the voice signal generated by the microphone. After a part of the signal is amplified by the amplifier, the voltage amplitude of the part of the signal is amplified to be the same as or close to the power supply voltage of the MCU microcontroller of the mobile terminal.
  • the mobile terminal MCU microcontroller detects and recognizes the frequency of the PWM signal, and obtains a pressed button according to the PWM signal frequency, and the processor CPU executes the corresponding function according to the corresponding button.
  • the PWM signal detection and recognition module built in the mobile terminal end detects and recognizes the PWM signal, and obtains the frequency of the corresponding PWM signal. So to determine which key is pressed, and finally tell the CPU through the CPU communication interface module (via the I2C interface or the normal IO port interrupt), and finally by the CPU Perform the corresponding functions to realize the control of the device terminal by the wire headset.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)

Abstract

本发明公开了一种移动终端的耳机线控电路及线控方法，包括通过信号线连接的耳机端电路和移动终端端电路，所述耳机端电路包括相连接的耳机端MCU微控制器和衰减及麦克风电路，移动终端端电路包括并联连接的音频模拟输入通道和放大器，放大器通过线路连接有移动终端端MCU微控制器，移动终端端MCU微控制器通过线路与处理器CPU连接，耳机端MCU微控制器内置有按键检测模块和PWM模块。本发明有效解决通话过程中按下按键时产生的POP杂音，提升通话质量。

Description

一种移动终端的耳机线控电路及线控方法
技术领域
本发明涉及一种手机、平板电脑等移动终端的耳机线控电路及线控方法。
背景技术
人们在平时生活当中时常会利用闲暇的时间欣赏音乐，以此来舒缓情绪，达到降压的作用。人们经常会利用手机、MP3等移动终端来播放音乐，而手机作为人们随身携带最多的工具，其被使用的也最多。由于直接开启手机进行音乐的听取，音量太大会影响到其他人，尤其是在办公室午休或者其他多人的房间内时，此时需要用耳机插到手机上，利用耳机来听取音乐，这样就不会影响到其他人。为了使用方便，现在很多耳机都是线控式耳机，即在耳机线上可以直接进行音量的调节，快进或者下一首，以及对移动终端音乐功能的开启或者关闭。
目前大部分线控耳机都是采用电阻分压的方式进行按键检测，当正在使用线控耳机上的麦克风MIC通话时，如果按下按键调节音量，此时会引起MIC偏置电压的变化，从而产生很刺耳的噪音--- pop 声，影响通话质量。
发明内容
本发明要解决的技术问题是提供一种移动终端的耳机线控电路及线控方法，采取发送不同频率的PWM信号传送按键信息，避免通话过程中产生POP声，提升通话品质。
为了解决上述技述问题，本发明提供一种移动终端的耳机线控电路，一种移动终端的耳机线控电路，包括通过信号线连接的耳机端电路和移动终端端电路，所述耳机端电路包括相连接的耳机端MCU微控制器和衰减及麦克风电路，移动终端端电路包括并联连接的音频模拟输入通道和放大器，放大器通过线路连接有移动终端端MCU微控制器，移动终端端MCU微控制器通过线路与处理器CPU连接，耳机端MCU微控制器内置有按键检测模块和PWM模块，移动终端端MCU微控制器内置有PWM信号检测识别模块和CPU通信接口模块。
所述衰减及麦克风电路包括电阻R1、电阻R2、电阻R3、电容C1、电容C2、电容C3及麦克风，电阻R1、电容C1、电阻R2、电阻R3和电容C2依次串联连接，电容C2接地，麦克风一端与电阻R3输入端连接、另一端接地，电容C3一端与电阻R3输入端连接、另一端与麦克风连接。
所述音频模拟输入通道内设有一ADC模块，该ADC模块输入端并接有一电阻R4。
所述PWM模块为能够发送100KHz～300 KHz频率的PWM信号的PWM模块。
本发明还提供一种移动终端线控耳机的线控方法，包括以下步骤：
耳机端MCU微控制器检测到有按键按下，PWM模块发送相对应的PWM信号；
PWM 信号进入衰减及麦克风电路，将该PWM信号衰减到100mV以下后与麦克风产生的语音信号叠加，然后进入音频模拟输入通道及放大器；
音频模拟输入通道内的频率在20KHz以下的语音信号被还原输出；放大器将频率在100KHz以上的PWM信号放大并将该放大后的PWM信号送至移动终端端MCU微控制器；
移动终端端MCU微控制器检测识别PWM信号的频率，根据PWM信号频率得到按下的按键，处理器CPU根据相应的按键执行相应的功能。
所述PWM模块发送的PWM信号为频率在100KHz～300 KHz的PWM信号。
所述检测到有按键按下具体包括，同一按键按下和松开时各发送一次频率不相同的PWM信号，并且不同按键按下时发送的PWM信号的频率均不相同，不同按键按下后松开时发送的PWM信号的频率均相同。
本发明采用不同频率的PWM信号传送按键信息，解决传统采用偏置分压方式检测按键的四段式线控耳机，在通话过程中按下按键会导致对方听到POP声的问题，提升通话质量和用户体验。此外，传统采用偏置分压方式检测按键的四段式线控耳机，由于ADC精度和防止误检测的原因，按键数目一般只能做到10个以内，而本发明的技术方案，按键的数目能够做到10个以上。
附图说明
附图1为本发明电路原理示意图；
附图2为本发明的原理流程示意图。
具体实施方式
为了便于本领域技术人员的理解，下面结合附图对本发明作进一步的描述。
如附图1所示， 一种移动终端的耳机线控电路，一种移动终端的耳机线控电路，包括通过信号线连接的耳机端电路和移动终端端电路，所述耳机端电路包括相连接的耳机端MCU微控制器和衰减及麦克风电路，移动终端端电路包括并联连接的音频模拟输入通道和放大器，放大器通过线路连接有移动终端端MCU微控制器，移动终端端MCU微控制器通过线路与处理器CPU连接，耳机端MCU微控制器内置有按键检测模块和PWM模块,移动终端端MCU微控制器内置有PWM信号检测识别模块和CPU通信接口模块。PWM模块即脉冲宽度调制模块。耳机端MCU微控制器中的按键检测模块与相应的按键建立连接，按键的数量可以灵活设定，按键检测模块用来检测是否有按键按下。PWM模块用来发送PWM信号，尤其是发送频率在 100KHz ～ 300 KHz 的PWM信号。放大器为常规的放大器，能够用于放大100KHz以上的PWM信号。
此外， 衰减及麦克风电路包括电阻R1、电阻R2、电阻R3、电容C1、电容C2、电容C3及麦克风，电阻R1、电容C1、电阻R2、电阻R3和电容C2依次串联连接，电容C2接地，麦克风一端与电阻R3输入端连接、另一端接地，电容C3一端与电阻R3输入端连接、另一端与麦克风连接。该衰减及麦克风电路能对PWM信号进行有效的衰减，能够将PWM信号衰减到 100mV 以下，然后该衰减的 PWM 信号与麦克风产生的语音信号叠加，然后通过信号线传输到移动终端端。
此外，音频模拟输入通道内设有一模数转换ADC模块，该ADC模块输入端并接有一电阻R4。该音频模拟输入通道可以将频率在20KHz以下的PWM信号进行过滤和转换，由模拟信号转换为数字信号，并最终还原成语音信号输出。
本发明还提供了一种移动终端线控耳机的线控方法，包括以下步骤：
S1 ，耳机端MCU微控制器检测到有按键按下，PWM模块发送相对应的PWM信号。耳机端MCU微控制器内的按键检测模块实时检测是否有按键按下，PWM模块则根据按键的按下和松开来发送相应的PWM信号。 检测到有按键按下具体包括，同一按键按下和松开时各发送一次频率不相同的PWM信号，并且不同按键按下时发送的PWM信号的频率均不相同，不同按键按下后松开时发送的PWM信号的频率均相同。 PWM 模块发送的PWM信号为频率在100KHz～300 KHz的PWM信号，并且PWM模块发送的初始PWM信号的电压在1.7V～2.5V之间的范围。
在本实施例中，如附图1所示，按下按键K1，发送对应信号的频率是F1，按下按键K2，发送对应信号的频率是F2，F1与F2的值是不相同的。按下按键后松开该按键时又会再发送一PWM信号，如上述，按下按键K1后松开时发送对应信号的频率为F0，按下按键K12后松开时发送对应信号的频率为F0，该F0与F1不相同，F0与F2也不相同。以此类推，每个按键按下的对应信号的频率均不相同，每个按键松开时对应信号的频率全部相同。
S2 ，PWM信号进入衰减及麦克风电路，将该PWM信号衰减到100mV以下后与麦克风产生的语音信号叠加，然后进入音频模拟输入通道及放大器。即衰减及麦克风电路将原来的电压幅值在1.7～2.5V之间的PWM信号衰减到100 mV以下后与麦克风产生的语音信号叠加，一部分信号经过放大器放大后，该部分信号的电压幅值被放大到与移动终端端的MCU微控制器的供电电压相同或者临近。
S3 ，音频模拟输入通道内的频率在20KHz以下的语音信号被还原输出；放大器将频率在100KHz以上的PWM信号放大并将该放大后的PWM信号送至移动终端端MCU微控制器。
S4 ，移动终端端MCU微控制器检测识别PWM信号的频率，根据PWM信号频率得到按下的按键，处理器CPU根据相应的按键执行相应的功能。内置在移动终端端内部的PWM信号检测识别模块对PWM信号进行检测识别，得到相应PWM信号的频率， 从而判断是哪个键按下，最后通过 CPU 通信接口模块将按键状态告诉 CPU （通过 I2C 接口或者普通的 IO 口中断），最后由 CPU 执行相应的功能，实现线控耳机对设备终端的控制。

Claims (7)

  1. 一种移动终端的耳机线控电路，包括通过信号线连接的耳机端电路和移动终端端电路，其特征在于，所述耳机端电路包括相连接的耳机端MCU微控制器和衰减及麦克风电路，移动终端端电路包括并联连接的音频模拟输入通道和放大器，放大器通过线路连接有移动终端端MCU微控制器，移动终端端MCU微控制器通过线路与处理器CPU连接，耳机端MCU微控制器内置有按键检测模块和PWM模块，移动终端端MCU微控制器内置有PWM信号检测识别模块和CPU通信接口模块。
  2. 根据权利要求1所述的移动终端的耳机线控电路，其特征在于，所述衰减及麦克风电路包括电阻R1、电阻R2、电阻R3、电容C1、电容C2、电容C3及麦克风，电阻R1、电容C1、电阻R2、电阻R3和电容C2依次串联连接，电容C2接地，麦克风一端与电阻R3输入端连接、另一端接地，电容C3一端与电阻R3输入端连接、另一端与麦克风连接。
  3. 根据权利要求2所述的移动终端的耳机线控电路，其特征在于，所述音频模拟输入通道内设有一ADC模块，该ADC模块输入端并接有一电阻R4。
  4. 根据权利要求3所述的移动终端的耳机线控电路，其特征在于，所述PWM模块为能够发送100KHz～300 KHz频率的PWM信号的PWM模块。
  5. 一种根据权利要求1～4中任一项所述的移动终端的耳机线控电路的线控方法，其特征在于，所述方法包括以下步骤：
    耳机端MCU微控制器检测到有按键按下，PWM模块发送相对应的PWM信号；
    PWM 信号进入衰减及麦克风电路，将该PWM信号衰减到100mV以下后与麦克风产生的语音信号叠加，然后进入音频模拟输入通道及放大器；
    音频模拟输入通道内的频率在20KHz以下的语音信号被还原输出；放大器将频率在100KHz以上的PWM信号放大并将放大后的PWM信号送至移动终端端MCU微控制器；
    移动终端端MCU微控制器检测识别PWM信号的频率，根据PWM信号频率得到按下的按键，处理器CPU根据相应的按键执行相应的功能。
  6. 根据权利要求6所述的线控方法，其特征在于，所述PWM模块发送的PWM信号为频率在100KHz～300 KHz的PWM信号。
  7. 根据权利要求7所述的线控方法，其特征在于，所述检测到有按键按下具体包括，同一按键按下和松开时各发送一次频率不相同的PWM信号，并且不同按键按下时发送的PWM信号的频率均不相同，不同按键按下后松开时发送的PWM信号的频率均相同。
PCT/CN2014/076751 2013-05-08 2014-05-05 一种移动终端的耳机线控电路及线控方法 WO2014180287A1 (zh)

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