WO2013010487A1 - 一种音频信号转接装置、音频信号传输系统 - Google Patents

一种音频信号转接装置、音频信号传输系统 Download PDF

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Publication number
WO2013010487A1
WO2013010487A1 PCT/CN2012/078834 CN2012078834W WO2013010487A1 WO 2013010487 A1 WO2013010487 A1 WO 2013010487A1 CN 2012078834 W CN2012078834 W CN 2012078834W WO 2013010487 A1 WO2013010487 A1 WO 2013010487A1
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Prior art keywords
pin
audio signal
audio
output
usb
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PCT/CN2012/078834
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English (en)
French (fr)
Inventor
李东声
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天地融科技股份有限公司
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Application filed by 天地融科技股份有限公司 filed Critical 天地融科技股份有限公司
Priority to EP20120814990 priority Critical patent/EP2736265A4/en
Priority to CA2842254A priority patent/CA2842254C/en
Priority to US14/233,422 priority patent/US9357297B2/en
Publication of WO2013010487A1 publication Critical patent/WO2013010487A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00Details of connection covered by H04R, not provided for in its groups
    • H04R2420/09Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/04Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments

Definitions

  • Audio signal switching device audio signal transmission system
  • the present invention relates to the field of electronic technologies, and in particular, to an audio signal switching device and an audio signal transmission system. Background technique
  • the electronic device may be connected to the mobile communication device through a port (for example, a headphone interface) of the mobile communication device (for example, a mobile phone), receive an audio signal output by the mobile communication device, or receive the mobile communication device through a microphone (MIC). Or the audio signal output by the speaker of the fixed telephone device.
  • a port for example, a headphone interface
  • the mobile communication device for example, a mobile phone
  • receive an audio signal output by the mobile communication device or receive the mobile communication device through a microphone (MIC).
  • MIC microphone
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an audio signal switching device that can output an audio signal output by a speaker to an electronic device through a USB interface and a corresponding audio signal receiving device.
  • the present invention provides an audio signal transmission system for receiving an audio signal
  • the system includes: an audio signal switching device, an audio signal receiving device;
  • the audio signal switching device includes: a microphone, an amplifying unit a USB transfer interface;
  • the microphone is configured to receive an audio signal and output through an audio pin;
  • the amplifying unit includes an audio input pin and an audio output pin for receiving through the audio input pin
  • the audio signal is amplified, and the amplified audio signal is output through the audio output pin;
  • the USB transfer interface is coupled to the audio signal receiving device Connecting, and including an audio signal pin;
  • an audio pin of the microphone is connected to an audio input pin of the amplifying unit;
  • an audio output pin of the amplifying unit is connected to an audio signal pin of the USB adapter interface
  • the audio signal receiving device includes: a USB interface, an audio receiving module;
  • the USB interface includes an audio signal pin; and an audio signal pin of the USB interface is connected to an audio signal pin of the USB adapter interface;
  • the audio receiving module is
  • the microphone further includes a ground pin;
  • the amplifying unit further includes a ground pin;
  • the USB transfer interface and the USB interface further include a reference signal pin; the reference signal pin of the USB transfer interface Connected to a ground pin of the microphone, and/or a ground pin of the amplifying unit; the reference signal pin is another of the D+ and D- pins of the USB transfer interface and the USB interface One.
  • the audio receiving module further includes: a comparator; a positive pole and a negative pole of the comparator are respectively connected to an audio signal pin and a reference signal pin of the USB interface, and an output pin of the comparator is used for outputting a square wave corresponding to the input audio signal; or, the positive and negative poles of the comparator are respectively connected to a reference signal pin and an audio signal pin of the USB interface, and an output pin of the comparator is used for output A square wave corresponding to the input audio signal.
  • the audio receiving module further includes: a DC signal isolation unit, a first DC bias unit, a second DC bias unit, a comparator; an audio input of the DC signal isolation unit and the USB interface a signal pin is connected, and the output end is connected to the second DC bias unit for isolating a DC level in the audio signal received through the audio signal pin of the USB interface, and outputting through the output end thereof;
  • An input end of the second DC bias unit is connected to the DC signal isolation unit, and an output end is connected to the negative pole of the comparator for adding a DC offset to the audio signal input through the input end thereof, and passing through the output end thereof Outputting an audio signal after DC offset;
  • an output of the first DC bias unit is connected to a positive terminal of the comparator for outputting a reference level; and the comparator is used for a reference current input at a positive pole and a negative pole thereof Under the action of the flat audio signal, the square wave corresponding to the audio signal is output through its output terminal.
  • the output of the comparator is connected to the
  • the first DC bias unit includes: a resistor (R3), a resistor (R4); one end of the resistor (R3) is connected to the power source, and the other end is connected to the resistor (R4); One end of R4) is connected to the resistor (R3) and the output end of the first DC bias unit, and the other end is grounded;
  • the second DC bias unit comprises: a resistor (R5), a resistor (R6); One end of the resistor (R5) is connected to the power source, and the other end is connected to the resistor (R6); one end of the resistor (R6) and the output of the resistor (R5) and the second DC bias unit Connected, the other end is grounded; the output voltage of the power supply connected to the first DC bias unit, the resistance of the resistor (R3), the resistance of the resistor (R4) and the second DC bias respectively The output voltage of the power source connected to the unit, the resistance of the resistor (R5), and the resistance of the resistor (R6) are the same.
  • the present invention also provides an audio signal switching device, comprising: a microphone; the device further includes an amplifying unit and a USB switching interface; wherein: the microphone is configured to receive an audio signal and output through an audio pin;
  • the amplifying unit includes an audio input pin and an audio output pin, configured to amplify an audio signal received through the audio input pin, and output an amplified audio signal through the audio output pin;
  • the interface is connected to the audio signal receiving device, and includes: an audio signal pin; an audio pin of the microphone is connected to an audio input pin of the amplifying unit; an audio output pin of the amplifying unit is connected to the USB The audio signal pins of the interface are connected; wherein the audio signal pins of the USB adapter interface are one of D+ and D- pins.
  • the microphone further includes a ground pin;
  • the amplifying unit further includes a ground pin;
  • the USB transfer interface further includes a reference signal pin; a reference signal pin of the USB transfer interface and the A ground pin of the microphone, and/or a ground pin of the amplifying unit; the reference signal pin being the other of the D+ and D- pins of the USB transfer interface.
  • the present invention realizes the function of the electronic device (audio signal receiving device) receiving the audio signal output by the speaker through the USB interface at a lower hardware cost; and the audio signal switching device of the present invention When used together with (for example, audio cable), the electronic device can receive the audio signal output by the speaker through the USB interface, without setting a separate port, and without setting the MIC function module, reducing the cost of the electronic device and reducing the electronic The volume of the device. Attachment 3 ⁇ 4
  • FIG. 1 is a schematic structural view of a first embodiment of an audio signal switching device of the present invention
  • FIG. 2 is a schematic structural view of a first embodiment of an audio signal receiving apparatus of the present invention
  • FIG. 3 is a schematic structural view of a second embodiment of an audio signal switching device of the present invention.
  • FIG. 4 is a schematic structural view of a third embodiment of an audio signal switching device of the present invention.
  • Figure 5 is a block diagram showing the structure of a third embodiment of the audio signal receiving apparatus of the present invention.
  • FIG. 6 is a schematic structural view of a fourth embodiment of an audio signal switching device of the present invention.
  • Figure 7 is a block diagram showing the structure of a fourth embodiment of the audio signal receiving apparatus of the present invention. With a 'body'* way
  • the audio signal switching device in the present invention may be an audio line, an audio patch cord, an audio adapter, or the like.
  • FIG. 1 is a schematic structural view of a first embodiment of an audio signal switching device of the present invention; as shown in FIG.
  • the audio signal switching device comprises: a microphone (MIC), an amplifying unit (such as the amplifier shown in FIG. 1), a USB transfer interface (such as the USB plug shown in FIG. 1);
  • Microphone an audio signal for receiving (output) a speaker of an audio signal transmitting device (for example, a mobile phone or a landline telephone).
  • the MIC contains the following pins: the audio pin (the AUDIO pin shown in Figure 1) and the ground (GND) pin.
  • the audio pin of the MIC is used to output the audio signal; the ground pin of the MIC is grounded.
  • An amplifier for amplifying the received audio signal and outputting the amplified audio signal contains the following pins: audio input pin, audio output pin, power input pin (VCC), ground (GND) pin.
  • the audio input pin of the amplifier is connected to the audio pin of the MIC to receive the audio signal output from the MIC pin.
  • the audio output pin of the amplifier is used to output the amplified audio signal.
  • the amplifier's power input pin is used to connect to the power supply; the amplifier's ground pin is grounded.
  • the MIC's ground pin can also be connected to the amplifier's ground pin.
  • a USB plug for connecting to the USB slot of the audio signal receiving device to output an audio signal thereto.
  • the USB plug contains: power supply pin (VBUS pin), D+ pin, D- pin, ground pin.
  • the audio output pin of the amplifier is connected to the D+ pin of the USB plug; the ground pin of the MIC, and/or the ground pin of the amplifier are connected to the D- pin of the USB plug. That is to say, in the embodiment, the audio signal switching device uses the D+ pin of the USB plug as an audio signal pin and the D- pin as a reference signal pin to output an audio signal to the audio signal receiving device in a differential manner.
  • the audio signal pins of the USB transfer interface and the USB interface are one of D+ and D- pins
  • the reference signal pins are D+ and D of the USB transfer interface and the USB interface. - The other of the pins.
  • Audio signal switching device and electronic device can be brought close to the speaker of the audio signal transmitting device (for example, a mobile phone, a fixed telephone) to receive the audio signal played by the speaker, the USB plug/slot of the audio signal switching device and the electronic device USB slot/plug connection, audio signal switching device uses the D+ pin of the plug/slot (collectively referred to as USB transfer interface) as the audio signal pin, and uses the D- pin as the reference signal pin, so that The audio signal received by the MIC is amplified and transmitted to an electronic device (audio signal receiving device) connected thereto.
  • 2 is a schematic structural diagram of a first embodiment of an audio signal receiving apparatus according to the present invention; as shown in FIG. 2, the apparatus includes: a USB interface (such as the USB slot shown in FIG. 2), and an audio receiving module.
  • USB slot for connecting to the USB plug of the audio signal switching device to receive the audio signal output from it.
  • the USB slot contains: power supply pin (VBUS pin), D+ pin, D- pin, ground pin.
  • the audio receiving module is connected to the D+ pin and the D- pin of the USB slot, and the D+ pin of the USB slot is used as an audio signal pin, and the D- pin is used as a reference signal pin, which is received through the D+ pin and D. - Audio signal transmitted by the pin.
  • the audio receiving module includes a comparator, and the positive and negative poles of the comparator are respectively connected to the D+ and D- pins, the grounding pin is grounded, the power pin is connected to the power source, and the output pin is used for the output pin.
  • a square wave corresponding to the input audio signal is output.
  • the positive and negative poles of the comparator can also be connected to the D- and D+ bows, respectively.
  • the first embodiment of the audio signal transmission system of the present invention is composed of the above audio signal switching device and audio signal receiving device. Second embodiment
  • FIG. 3 is a schematic structural view of a second embodiment of the audio signal switching device of the present invention. As shown in FIG. 3, the second embodiment of the audio signal switching device of the present invention is different from the first embodiment in that:
  • the audio signal switching device uses the D-pin of the USB plug as an audio signal.
  • the pin is connected to the audio output pin of the amplifier, and the D+ pin is connected as a reference signal pin to the ground pin of the MIC, and/or the ground pin of the amplifier, and outputs an audio signal to the audio signal receiving device.
  • the second embodiment of the audio signal receiving apparatus is the same as the first embodiment.
  • the second embodiment of the audio signal transmission system of the present invention is composed of the above-described audio signal switching device and audio signal receiving device.
  • Third embodiment is composed of the above-described audio signal switching device and audio signal receiving device.
  • FIG. 4 is a schematic structural view of a third embodiment of the audio signal switching device of the present invention. As shown in FIG. 4, the third embodiment of the audio signal switching device of the present invention is different from the first embodiment in that:
  • FIG. 5 is a schematic structural diagram of a third embodiment of an audio signal receiving apparatus according to the present invention; as shown in FIG. 5, the apparatus includes: a USB interface (such as a USB slot shown in FIG. 5), and an audio receiving module.
  • a USB interface such as a USB slot shown in FIG. 5
  • USB slot for connecting to the USB plug of the audio signal switching device to receive the audio signal output from it.
  • the USB slot contains: power supply pin (VBUS pin), D+ pin, D- pin, ground pin.
  • the input of the audio receiving module is connected to the audio signal pin (D+ pin) for receiving the audio signal through the audio signal pin (D+ pin) and outputting through its output.
  • the audio receiving module includes: a DC signal isolation unit, a first DC bias unit, a second DC bias unit, and a comparator.
  • the audio receiving module includes: a DC signal isolation unit, a first DC bias unit, a second DC bias unit, and a comparator.
  • the DC signal isolation unit includes a capacitor C1 for isolating the DC level, the capacitor One end of the CI (the input of the DC signal isolation unit) is connected to the audio signal pin, and the other end (the output of the DC signal isolation unit) is connected to the second DC bias unit.
  • the capacitance of capacitor C1 can be 0.1 F.
  • the output of the first DC bias unit is coupled to the positive terminal of the comparator for outputting a reference level to the comparator.
  • the first DC biasing unit includes: a resistor R3 and a resistor R4; one end of the resistor R3 is connected to the power source, and the other end is connected to the resistor R4; one end of the resistor R4 is connected to the resistor R3 and the first DC bias unit. The outputs are connected and the other end is grounded.
  • the input end of the second DC bias unit is connected to the output end of the DC signal isolation unit, and the output end is connected to the negative pole of the comparator for adding a DC offset to the audio signal input to the input end thereof, and boosting the minimum voltage of the audio signal Up to 0 volts or more, and output the dc biased audio signal through its output.
  • the second DC biasing unit includes: a resistor R5 and a resistor R6; one end of the resistor R5 is connected to the power source, and the other end is connected to the resistor R6; one end of the resistor R6 is connected to the input end of the second DC bias unit, and the resistor R5 is connected to the output of the second DC bias unit, and the other end is grounded.
  • the output voltage of the power supply of the first DC bias unit, the resistance of the resistor R3, and the resistance of the resistor R4 are respectively the same as the output voltage of the power source of the second DC bias unit, the resistance of the resistor R5, and the resistance of the resistor R6. .
  • the resistance of the resistor R3 and the resistor R5 may be 150K ohms
  • the resistance of the resistor R4 and the resistor R6 may be 15K ohms.
  • the anode of the comparator is connected to the output of the first DC bias unit
  • the cathode of the comparator is connected to the output of the second DC bias unit
  • the output of the comparator is connected to the output of the audio receiving module. (ie as the output of the audio receiving module), the square wave corresponding to the audio signal is output.
  • the output of the comparator is connected to its positive terminal via a resistor R7 to form a loop, and the output of the comparator is connected to a pull-up resistor R8.
  • a third embodiment of the audio signal transmission system of the present invention is composed of the above-described audio signal switching device and audio signal receiving device. Fourth embodiment
  • FIG. 6 is a schematic structural view of a fourth embodiment of the audio signal switching device of the present invention. As shown in FIG. 6, the fourth embodiment of the audio signal switching device of the present invention is different from the third embodiment in that:
  • the audio signal switching device connects the D- pin of the USB plug as an audio signal pin to the audio output pin of the amplifier, and outputs an audio signal to the audio signal receiving device.
  • Figure 7 is a block diagram showing the structure of a fourth embodiment of the audio signal receiving apparatus of the present invention; as shown in Figure 7, the fourth embodiment of the audio signal receiving apparatus of the present invention is different from the third embodiment in that:
  • the input end of the audio receiving module is connected to the D-pin for receiving an audio signal through the D-pin and outputting through the output terminal thereof.
  • a fourth embodiment of the audio signal transmission system of the present invention is composed of the above-described audio signal switching device and audio signal receiving device.
  • the present invention realizes a function of an electronic device (audio signal receiving device) receiving an audio signal output by a speaker through a USB interface at a lower hardware cost; and an audio signal switching device (for example, an audio line) of the present invention.
  • the electronic device can receive the audio signal output by the speaker through the USB interface, and does not need to set a separate rabi interface, and does not need to set the MIC module, which reduces the cost of the electronic device and reduces the size of the electronic device.
  • connection should be understood broadly, and may be either a fixed connection or a detachable connection, or Connected integrally; may be mechanically connected or electrically connected; may be directly connected, or may be indirectly connected through an intermediate medium. It will be understood by those skilled in the art that the above terms are specific in the present invention. Further, in the description of the present invention, “multiple” means two or more unless otherwise stated.
  • any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a particular logical function or process.
  • the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an opposite order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present invention pertain. The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope of the present disclosure. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

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Abstract

本发明公开了一种音频信号转接装置、音频信号传输系统;上述系统包含音频信号转接装置,音频信号接收装置;音频信号转接装置包含麦克风,放大单元,USB转接接口;麦克风用于接收音频信号并通过音频引脚输出;放大器包含音频输入引脚和音频输出引脚,用于对音频信号进行放大并通过音频输出引脚输出;USB转接接口与音频信号接收装置相连,包含音频信号引脚;麦克风的音频引脚与放大器的音频输入引脚相连;放大器的音频输出引脚与USB转接接口的音频信号引脚相连;音频信号接收装置中包含USB接口,音频接收模块;USB接口包含音频信号引脚;音频接收模块与USB接口的音频信号引脚相连,通过USB接口的音频信号引脚接收音频信号。

Description

一种音频信号转接装置、 音频信号传输系统 技术领域
本发明涉及电子技术领域, 尤其涉及一种音频信号转接装置、 音频信号传 输系统。 背景技术
随着音频信号编码 /解码技术的发展,通过音频接口传输数据的电子设备越 来越多。 例如, 电子设备可以通过移动通信装置(例如, 手机)的喇八接口(例 如, 耳机接口) 与移动通信装置相连, 接收移动通信装置输出的音频信号, 也 可以通过麦克风(MIC )接收移动通讯装置或固定电话装置的扬声器输出的音 频信号。
此外, 随着 USB接口的普及, 大量的电子设备设置有 USB接口, 因此如 何通过电子设备的 USB接口接收移动通信装置或固定电话装置的扬声器输出 的音频信号是目前需要解决的技术问题。 发明内容
本发明所要解决的技术问题是, 克服现有技术的不足, 提供一种可以通过 USB接口将扬声器输出的音频信号输出至电子设备的音频信号转接装置以及 相应的音频信号接收装置。
为了解决上述问题, 本发明提供一种音频信号传输系统, 用于接收音频信 号, 该系统包含: 音频信号转接装置, 音频信号接收装置; 所述音频信号转接 装置中包含: 麦克风, 放大单元, USB转接接口; 所述麦克风用于接收音频信 号, 并通过音频引脚输出; 所述放大单元包含音频输入引脚和音频输出引脚, 用于对通过所述音频输入引脚接收到的音频信号进行放大, 并通过所述音频输 出引脚输出放大后的音频信号;所述 USB转接接口与所述音频信号接收装置相 连, 且包含音频信号引脚; 所述麦克风的音频引脚与所述放大单元的音频输入 引脚相连;所述放大单元的音频输出引脚与所述 USB转接接口的音频信号引脚 相连; 所述音频信号接收装置包含: USB接口, 音频接收模块; 所述 USB接 口包含音频信号引脚; 所述 USB接口的音频信号引脚与所述 USB转接接口的 音频信号引脚相连; 所述音频接收模块与所述 USB接口的音频信号引脚相连, 通过所述 USB接口的音频信号引脚接收音频信号; 其中, 所述 USB转接接口 和所述 USB接口的音频信号引脚为 D+和 D-引脚中的一个。
此外, 所述麦克风还包含地线引脚; 所述放大单元还包含地线引脚; 所述 USB转接接口和 USB接口还包含参考信号引脚; 所述 USB转接接口的参考信 号引脚与所述麦克风的地线引脚、 和 /或所述放大单元的地线引脚相连; 所述参 考信号引脚为所述 USB转接接口和 USB接口的 D+和 D-引脚中的另一个。
此外, 所述音频接收模块还包含: 比较器; 所述比较器的正极和负极分别 与所述 USB接口的音频信号引脚和参考信号引脚相连,所述比较器的输出引脚 用于输出与输入的音频信号相对应的方波; 或者, 所述比较器的正极和负极分 别与所述 USB接口的参考信号引脚和音频信号引脚相连,所述比较器的输出引 脚用于输出与输入的音频信号相对应的方波。
此外, 所述音频接收模块中还包含: 直流信号隔离单元, 第一直流偏置单 元, 第二直流偏置单元, 比较器; 所述直流信号隔离单元的输入端与所述 USB 接口的音频信号引脚相连, 输出端与所述第二直流偏置单元相连, 用于隔离通 过所述 USB接口的音频信号引脚接收到的音频信号中的直流电平,并通过其输 出端输出; 所述第二直流偏置单元的输入端与所述直流信号隔离单元相连, 输 出端与所述比较器的负极相连, 用于对通过其输入端输入的音频信号增加直流 偏置, 并通过其输出端输出增加直流偏置后的音频信号; 所述第一直流偏置单 元的输出端与比较器的正极相连, 用于输出参考电平; 所述比较器用于在其正 极和负极输入的参考电平和音频信号的作用下, 通过其输出端输出音频信号所 对应的方波。 此外, 所述比较器的输出端与正极通过电阻(R7 )相连, 且所述比较器的 输出端与上拉电阻(R8 )相连。
此外,所述第一直流偏置单元包含:电阻(R3 ),电阻(R4 );所述电阻(R3 ) 的一端与电源相连, 另一端与所述电阻(R4 )相连; 所述电阻(R4 )的一端与 所述电阻 (R3)及所述第一直流偏置单元的输出端相连, 另一端接地; 所述第二 直流偏置单元包含: 电阻 (R5), 电阻 (R6); 所述电阻(R5 )的一端与电源相连, 另一端与所述电阻(R6 )相连; 所述电阻(R6 )的一端与所述电阻(R5 )及所 述第二直流偏置单元的输出端相连, 另一端接地; 所述第一直流偏置单元所接 电源的输出电压、 所述电阻(R3 )的阻值、 所述电阻(R4 )的阻值分别与所述 第二直流偏置单元所接电源的输出电压、所述电阻( R5 )的阻值、所述电阻( R6 ) 的阻值相同。
本发明还提出了一种音频信号转接装置, 包含: 麦克风; 所述装置还包含 放大单元和 USB转接接口; 其中: 所述麦克风用于接收音频信号, 并通过音频 引脚输出; 所述放大单元包含音频输入引脚和音频输出引脚, 用于对通过所述 音频输入引脚接收到的音频信号进行放大, 并通过所述音频输出引脚输出放大 后的音频信号; 所述 USB转接接口与音频信号接收装置相连, 包含: 音频信号 引脚; 所述麦克风的音频引脚与所述放大单元的音频输入引脚相连; 所述放大 单元的音频输出引脚与所述 USB 转接接口的音频信号引脚相连; 其中, 所述 USB转接接口的音频信号引脚为 D+和 D-引脚中的一个。
此外, 所述麦克风还包含地线引脚; 所述放大单元还包含地线引脚; 所述 USB转接接口还包含参考信号引脚; 所述 USB转接接口的参考信号引脚与所 述麦克风的地线引脚、 和 /或所述放大单元的地线引脚相连; 所述参考信号引脚 为所述 USB转接接口的 D+和 D-引脚中的另一个。 综上所述,本发明以较低的硬件成本实现了电子设备 (音频信号接收装置) 通过 USB接口接收扬声器输出的音频信号的功能;与本发明的音频信号转接装 置(例如, 音频线)配合使用时, 电子设备可以通过 USB接口接收扬声器输出 的音频信号, 无需设置独立的喇八接口, 也无需设置 MIC功能模块, 降低了电 子设备的成本, 减小了电子设备的体积。 附¾说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例描述中所需 要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的 一些实施例,对于本领域的普通技术人员来讲,在不付出创造性劳动的前提下, 还可以根据这些附图获得其他附图。
图 1是本发明的音频信号转接装置第一实施例的结构示意图;
图 2是本发明的音频信号接收装置第一实施例的结构示意图;
图 3是本发明的音频信号转接装置第二实施例的结构示意图;
图 4是本发明的音频信号转接装置第三实施例的结构示意图;
图 5是本发明的音频信号接收装置第三实施例的结构示意图;
图 6是本发明的音频信号转接装置第四实施例的结构示意图;
图 7是本发明的音频信号接收装置第四实施例的结构示意图。 具'体实 it*方式
下面结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部 的实施例。 基于本发明的实施例, 本领域普通技术人员在没有做出创造性劳动 前提下所获得的所有其他实施例, 都属于本发明的保护范围。
下面将结合附图对本发明实施例作进一步地详细描述。
本发明中的音频信号转接装置可以是音频线、音频转接线、音频转接头等。 第一实施例
图 1是本发明的音频信号转接装置第一实施例的结构示意图;如图 1所示, 该音频信号转接装置包含: 麦克风(MIC ),放大单元(如图 1所示的放大器), USB转接接口 (如图 1所示的 USB插头); 其中:
麦克风(MIC ), 用于接收音频信号发送装置(例如, 手机或固定电话)的 扬声器播放(输出) 的音频信号。
MIC包含以下引脚:音频引脚(如图 1所示的 AUDIO引脚),地线(GND ) 引脚。
MIC的音频引脚用于输出音频信号; MIC的地线引脚接地。
放大器, 用于对接收到的音频信号进行放大, 并输出放大后的音频信号。 放大器包含以下引脚:音频输入引脚,音频输出引脚,电源输入引脚(VCC ), 地线(GND ) 引脚。
放大器的音频输入引脚与 MIC的音频引脚相连, 接收 MIC引脚输出的音 频信号。
放大器的音频输出引脚用于输出放大后的音频信号。
放大器的电源输入引脚用于与电源相连; 放大器的地线引脚接地。
此外, MIC的地线引脚还可以与放大器的地线引脚相连。
USB插头, 用于与音频信号接收装置的 USB插槽相连, 向其输出音频信 号。
USB插头中包含: 电源引脚( VBUS引脚), D+引脚, D-引脚, 地线引脚。 本实施例中, 放大器的音频输出引脚与 USB插头的 D+引脚相连; MIC的 地线引脚、 和 /或放大器的地线引脚与 USB插头的 D-引脚相连。 也就是说, 本 实施例中, 音频信号转接装置将 USB插头的 D+引脚作为音频信号引脚, 将 D- 引脚作为参考信号引脚, 以差分方式向音频信号接收装置输出音频信号。
在本发明的一个实施例中, USB转接接口和 USB接口的音频信号引脚为 D+和 D-引脚中的一个, 参考信号引脚为所述 USB转接接口和 USB接口的 D+ 和 D-引脚中的另一个。
将本发明第一实施例的音频信号转接装置与电子设备(音频信号接收装置 ) 配合使用时, 可将音频信号转接装置的 MIC靠近音频信号发送装置(例如, 手 机、 固定电话) 的扬声器以便接收扬声器播放的音频信号, 音频信号转接装置 的 USB插头 /插槽与电子设备的 USB插槽 /插头连接,音频信号转接装置将插头 /插槽(统称为 USB转接接口) 的 D+引脚作为音频信号引脚, 将 D-引脚作为 参考信号引脚使用,以便将 MIC接收到的音频信号经过放大后发送给与其连接 的电子设备(音频信号接收装置)。 图 2是本发明的音频信号接收装置第一实施例的结构示意图;如图 2所示, 该装置包含: USB接口 (如图 2所示的 USB插槽), 音频接收模块。
USB插槽, 用于与音频信号转接装置的 USB插头相连, 接收其输出的音 频信号。
USB插槽中包含: 电源引脚( VBUS引脚), D+引脚, D-引脚, 地线引脚。 音频接收模块, 与 USB插槽的 D+引脚和 D-引脚相连, 将 USB插槽的 D+ 引脚作为音频信号引脚, D-引脚作为参考信号引脚, 接收通过 D+引脚和 D-引 脚传输的音频信号。
本实施例中,音频接收模块中包含比较器, 比较器的正极和负极分别与 D+ 和 D-引脚相连, 其地线引脚接地, 其电源引脚与电源相连, 其输出引脚用于输 出与输入的音频信号相对应的方波。
此外, 比较器的正极和负极也可以分别与 D-和 D+弓 I脚相连。 本发明音频信号传输系统的第一实施例由上述音频信号转接装置和音频信 号接收装置组成。 第二实施例
图 3是本发明的音频信号转接装置第二实施例的结构示意图;如图 3所示, 本发明的音频信号转接装置第二实施例与第一实施例的不同之处是:
第二实施例中, 音频信号转接装置将 USB插头的 D-引脚作为音频信号引 脚与放大器的音频输出引脚相连, 将 D+引脚作为参考信号引脚与 MIC的地线 引脚、 和 /或放大器的地线引脚相连, 向音频信号接收装置输出音频信号。 音频信号接收装置第二实施例与第一实施例相同。
本发明音频信号传输系统的第二实施例由上述音频信号转接装置和音频信 号接收装置组成。 第三实施例
图 4是本发明的音频信号转接装置第三实施例的结构示意图;如图 4所示, 本发明的音频信号转接装置第三实施例与第一实施例的不同之处是:
第三实施例中, 仅将放大器的音频输出引脚与 USB插头的 D+引脚相连, MIC的地线引脚和放大器的地线引脚无需与 USB插头的 D-引脚相连。 也就是 说,本实施例中,音频信号转接装置将 USB插头的 D+引脚作为音频信号引脚, 以非差分方式向音频信号接收装置输出音频信号。 图 5是本发明的音频信号接收装置第三实施例的结构示意图;如图 5所示, 该装置包含: USB接口 (如图 5所示的 USB插槽), 音频接收模块。
USB插槽, 用于与音频信号转接装置的 USB插头相连, 接收其输出的音 频信号。
USB插槽中包含: 电源引脚( VBUS引脚), D+引脚, D-引脚, 地线引脚。 音频接收模块的输入端与音频信号引脚(D+引脚)相连, 用于通过音频信 号引脚(D+引脚)接收音频信号, 并通过其输出端输出。
音频接收模块中包含: 直流信号隔离单元, 第一直流偏置单元, 第二直流 偏置单元, 比较器。
音频接收模块中包含: 直流信号隔离单元, 第一直流偏置单元, 第二直流 偏置单元, 比较器。
本实施例中, 直流信号隔离单元包含电容器 C1 , 用于隔离直流电平, 电容 器 CI的一端(直流信号隔离单元的输入端)与音频信号引脚相连, 另一端(直 流信号隔离单元的输出端)与第二直流偏置单元相连。
电容器 C1的电容值可以是 0.1 F。
第一直流偏置单元的输出端与比较器的正极相连, 用于向比较器输出参考 电平。
本实施例中, 第一直流偏置单元包含: 电阻 R3 , 电阻 R4; 电阻 R3的一端 与电源相连, 另一端与电阻 R4相连; 电阻 R4的一端与电阻 R3及第一直流偏 置单元的输出端相连, 另一端接地。
第二直流偏置单元的输入端与直流信号隔离单元的输出端相连, 输出端与 比较器的负极相连, 用于对其输入端输入的音频信号增加直流偏置, 将音频信 号的最小电压提升至 0伏以上, 并通过其输出端输出增加直流偏置后的音频信 号。
本实施例中, 第二直流偏置单元包含: 电阻 R5 , 电阻 R6; 电阻 R5的一端 与电源相连, 另一端与电阻 R6相连; 电阻 R6的一端与第二直流偏置单元的输 入端、 电阻 R5及第二直流偏置单元的输出端相连, 另一端接地。
第一直流偏置单元的电源的输出电压、 电阻 R3的阻值、 电阻 R4的阻值分 别与第二直流偏置单元的电源的输出电压、 电阻 R5的阻值、 电阻 R6的阻值相 同。
本实施例中, 电阻 R3和电阻 R5的阻值可以是 150K欧姆, 电阻 R4和电 阻 R6的阻值可以是 15K欧姆。
如上所述, 比较器的正极与第一直流偏置单元的输出端相连, 比较器的负 极与第二直流偏置单元的输出端相连, 比较器的输出端与音频接收模块的输出 端相连(即作为音频接收模块的输出端), 输出音频信号所对应的方波。
本实施例中, 为了使比较器输出稳定的信号, 比较器的输出端与其正极通 过电阻 R7相连, 形成回路, 且比较器的输出端与一上拉电阻 R8相连。
电阻 R7的阻值可以是 1.5M欧姆, 电阻 R8的阻值可以是 20K欧姆。 本发明音频信号传输系统的第三实施例由上述音频信号转接装置和音频信 号接收装置组成。 第四实施例
图 6是本发明的音频信号转接装置第四实施例的结构示意图;如图 6所示, 本发明的音频信号转接装置第四实施例与第三实施例的不同之处是:
第四实施例中, 音频信号转接装置将 USB插头的 D-引脚作为音频信号引 脚与放大器的音频输出引脚相连, 向音频信号接收装置输出音频信号。 图 7是本发明的音频信号接收装置第四实施例的结构示意图;如图 7所示, 本发明的音频信号接收装置第四实施例与第三实施例的不同之处是:
第四实施例中, 音频接收模块的输入端与 D-引脚相连, 用于通过 D-引脚 接收音频信号, 并通过其输出端输出。 本发明音频信号传输系统的第四实施例由上述音频信号转接装置和音频信 号接收装置组成。 综上所述,本发明以较低的硬件成本实现了电子设备 (音频信号接收装置) 通过 USB接口接收扬声器输出的音频信号的功能;与本发明的音频信号转接装 置(例如, 音频线)配合使用时, 电子设备可以通过 USB接口接收扬声器输出 的音频信号, 无需设置独立的喇八接口, 也无需设置 MIC模块, 降低了电子设 备的成本, 减小了电子设备的体积。 以上参考附图描述的实施例是示例性的, 仅用于解释本发明, 而不能理解 为对本发明的限制。 相反, 本发明的实施例包括落入所附加权利要求书的精神 和内涵范围内的所有变化、 修改和等同物。 在本发明的描述中, 需要理解的是, 术语 "第一"、 "第二 "等仅用于描述目 的,而不能理解为指示或暗示相对重要性。在本发明的描述中,需要说明的是, 除非另有明确的规定和限定, 术语 "相连,,、 "连接 "应做广义理解, 例如, 可以 是固定连接, 也可以是可拆卸连接, 或一体地连接; 可以是机械连接, 也可以 是电连接; 可以是直接相连, 也可以通过中间媒介间接相连。 对于本领域的普 通技术人员而言, 可以具体情况理解上述术语在本发明中的具体含义。 此外, 在本发明的描述中, 除非另有说明, "多个"的含义是两个或两个以上。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为, 表 示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码 的模块、 片段或部分, 并且本发明的优选实施方式的范围包括另外的实现, 其 中可以不按所示出或讨论的顺序, 包括根据所涉及的功能按基本同时的方式或 按相反的顺序, 来执行功能, 这应被本发明的实施例所属技术领域的技术人员 所理解。 以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不局 限于此, 任何熟悉本技术领域的技术人员在本发明披露的技术范围内, 可轻易 想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应该以权利要求书的保护范围为准。

Claims

权利要求书
1、 一种音频信号传输系统, 用于接收音频信号, 该系统包含: 音频信号转 接装置, 音频信号接收装置; 其特征在于:
所述音频信号转接装置中包含: 麦克风, 放大单元, USB转接接口; 所述麦克风用于接收音频信号, 并通过音频引脚输出;
所述放大单元包含音频输入引脚和音频输出引脚, 用于对通过所述音频输 入引脚接收到的音频信号进行放大, 并通过所述音频输出引脚输出放大后的音 频信号;
所述 USB转接接口与所述音频信号接收装置相连, 且包含音频信号引脚; 所述麦克风的音频引脚与所述放大单元的音频输入引脚相连; 所述放大单 元的音频输出引脚与所述 USB转接接口的音频信号引脚相连;
所述音频信号接收装置包含: USB接口, 音频接收模块;
所述 USB接口包含音频信号引脚; 所述 USB接口的音频信号引脚与所述
USB转接接口的音频信号引脚相连;
所述音频接收模块与所述 USB接口的音频信号引脚相连, 通过所述 USB 接口的音频信号引脚接收音频信号;
其中, 所述 USB转接接口和所述 USB接口的音频信号引脚为 D+和 D-引 脚中的一个。
2、 如权利要求 1所述的系统, 其特征在于,
所述麦克风还包含地线引脚;
所述放大单元还包含地线引脚;
所述 USB转接接口和 USB接口还包含参考信号引脚;
所述 USB转接接口的参考信号引脚与所述麦克风的地线引脚、 和 /或所述 放大单元的地线引脚相连;
所述参考信号引脚为所述 USB转接接口和 USB接口的 D+和 D-引脚中的 另一个。
3、 如权利要求 2所述的系统, 其特征在于,
所述音频接收模块还包含: 比较器;
所述比较器的正极和负极分别与所述 USB接口的音频信号引脚和参考信 号引脚相连,所述比较器的输出引脚用于输出与输入的音频信号相对应的方波; 或者,所述比较器的正极和负极分别与所述 USB接口的参考信号引脚和音 频信号引脚相连, 所述比较器的输出引脚用于输出与输入的音频信号相对应的 方波。
4、 如权利要求 1所述的系统, 其特征在于,
所述音频接收模块中还包含: 直流信号隔离单元, 第一直流偏置单元, 第 二直流偏置单元, 比较器;
所述直流信号隔离单元的输入端与所述 USB接口的音频信号弓 I脚相连,输 出端与所述第二直流偏置单元相连,用于隔离通过所述 USB接口的音频信号引 脚接收到的音频信号中的直流电平, 并通过其输出端输出;
所述第二直流偏置单元的输入端与所述直流信号隔离单元相连, 输出端与 所述比较器的负极相连, 用于对通过其输入端输入的音频信号增加直流偏置, 并通过其输出端输出增加直流偏置后的音频信号;
所述第一直流偏置单元的输出端与比较器的正极相连,用于输出参考电平; 所述比较器用于在其正极和负极输入的参考电平和音频信号的作用下, 通 过其输出端输出音频信号所对应的方波。
5、 如权利要求 4所述的系统, 其特征在于,
所述比较器的输出端与正极通过电阻 R7相连, 且所述比较器的输出端与 上拉电阻 R8相连。
6、 如权利要求 4所述的系统, 其特征在于,
所述第一直流偏置单元包含: 电阻 R3 , 电阻 R4;
所述电阻 R3的一端与电源相连, 另一端与所述电阻 R4相连; 所述电阻 R4的一端与所述电阻 R3及所述第一直流偏置单元的输出端相连, 另一端接地;
所述第二直流偏置单元包含: 电阻 R5, 电阻 R6;
所述电阻 R5的一端与电源相连, 另一端与所述电阻 R6相连;
所述电阻 R6的一端与所述电阻 R5及所述第二直流偏置单元的输出端相连, 另一端接地;
所述第一直流偏置单元所接电源的输出电压、 所述电阻 R3 的阻值、 所述 电阻 R4 的阻值分别与所述第二直流偏置单元所接电源的输出电压、 所述电阻 R5的阻值、 所述电阻 R6的阻值相同。
7、 一种音频信号转接装置, 包含: 麦克风; 其特征在于: 所述装置还包含 放大单元和 USB转接接口; 其中:
所述麦克风用于接收音频信号, 并通过音频引脚输出;
所述放大单元包含音频输入引脚和音频输出引脚, 用于对通过所述音频输 入引脚接收到的音频信号进行放大, 并通过所述音频输出引脚输出放大后的音 频信号;
所述 USB转接接口与音频信号接收装置相连, 包含: 音频信号引脚; 所述麦克风的音频引脚与所述放大单元的音频输入引脚相连; 所述放大单 元的音频输出引脚与所述 USB转接接口的音频信号引脚相连;
其中, 所述 USB转接接口的音频信号引脚为 D+和 D-引脚中的一个。
8、 如权利要求 7所述的装置, 其特征在于,
所述麦克风还包含地线引脚;
所述放大单元还包含地线引脚;
所述 USB转接接口还包含参考信号引脚;
所述 USB转接接口的参考信号引脚与所述麦克风的地线引脚、 和 /或所述 放大单元的地线引脚相连;
所述参考信号引脚为所述 USB转接接口的 D+和 D-引脚中的另一个。
PCT/CN2012/078834 2011-07-18 2012-07-18 一种音频信号转接装置、音频信号传输系统 WO2013010487A1 (zh)

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