WO2015113473A1 - 智能密钥设备及音频信号传输系统 - Google Patents

智能密钥设备及音频信号传输系统 Download PDF

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Publication number
WO2015113473A1
WO2015113473A1 PCT/CN2015/071202 CN2015071202W WO2015113473A1 WO 2015113473 A1 WO2015113473 A1 WO 2015113473A1 CN 2015071202 W CN2015071202 W CN 2015071202W WO 2015113473 A1 WO2015113473 A1 WO 2015113473A1
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Prior art keywords
voltage
dividing unit
processing circuit
voltage dividing
smart key
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PCT/CN2015/071202
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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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Publication of WO2015113473A1 publication Critical patent/WO2015113473A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones

Definitions

  • the present invention relates to the field of electronic technologies, and in particular, to a smart key device and an audio signal transmission system.
  • smart key devices keyboards
  • terminals such as mobile phones and tablet computers can communicate through an audio interface.
  • the audio signal is sent to the terminal, and the terminal needs to perform AD (Alternate-Direct) sampling on the received audio signal. If the voltage amplitude is too large and exceeds the AD sampling range, an overshoot will occur, causing the sampled signal to be distorted compared to the original transmitted audio signal, and the terminal cannot obtain the correct signal, and the data transmission fails.
  • AD Alternate-Direct
  • the present invention provides a smart key device and an audio signal transmission system to solve at least one of the above problems.
  • a smart key device includes: a security chip, a first voltage dividing unit, a second voltage dividing unit, a voltage processing circuit, and an audio interface, wherein one end of the first voltage dividing unit is respectively Connected to the output end of the security chip and the power supply, and the other end is connected to the second voltage dividing unit and the input end of the voltage processing circuit; one end of the second voltage dividing unit and the first partial voltage The two terminals of the voltage processing circuit are respectively connected to the microphone pin and the ground pin of the audio interface; wherein the voltage of the first voltage dividing unit is greater than the first The voltage consumed by the two-divider unit.
  • the voltage processing circuit includes: a first processing circuit and a second processing circuit, wherein the first processing circuit and the second processing circuit are mutually attenuating circuits, and an input end of the first processing circuit and the first The inputs of the two processing circuits are connected.
  • the first processing circuit employs a filter circuit and/or a voltage divider circuit
  • the second processing circuit employs a filter circuit and/or a voltage divider circuit
  • a smart key device including: a security chip, a first voltage dividing unit, a second voltage dividing unit, a third voltage dividing unit, a voltage processing circuit, and an audio interface, One end of the voltage dividing unit is connected to the power source, and the other end is connected to the second voltage dividing unit and the output end of the security chip respectively; one end of the second voltage dividing unit is connected to the first voltage dividing unit, The other end is respectively connected to the third voltage dividing unit and the voltage An input end of the processing circuit is connected; one end of the third voltage dividing unit is connected to the second voltage dividing unit, and the other end is grounded; two output ends of the voltage processing circuit are respectively connected with the microphone pins of the audio interface Connected to the ground pin; wherein, the voltage consumed by the first voltage dividing unit is equal to a sum of a voltage consumed by the second voltage dividing unit and a voltage consumed by the third voltage dividing unit, and the second point The voltage consumed by the voltage unit is greater than the
  • the voltage processing circuit includes: a first processing circuit and a second processing circuit, wherein the first processing circuit and the second processing circuit are mutually attenuating circuits, and an input end of the first processing circuit and the first The inputs of the two processing circuits are connected.
  • the first processing circuit employs a filter circuit and/or a voltage divider circuit
  • the second processing circuit employs a filter circuit and/or a voltage divider circuit
  • an audio signal transmission system comprising any of the above-described smart key devices and a terminal with an audio interface, an audio interface of the smart key device and an audio interface of the terminal Matching, the smart key device is connected to and communicates with the terminal via its audio interface.
  • the present invention provides a smart key device and an audio signal transmission system.
  • the smart key device divides the audio uplink signal to be sent by the voltage dividing unit, and further passes the voltage processing.
  • the circuit reduces the voltage amplitude input to the microphone pin of the smart key device audio interface, that is, reduces the voltage amplitude of the signal received by the microphone pin of the terminal audio interface, so that it does not exceed the AD sampling range, thereby avoiding The occurrence of overshoot.
  • FIG. 1 is a schematic diagram of a smart key device according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a smart key device according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic structural diagram 1 of a voltage processing circuit according to Embodiment 1 of the present invention.
  • FIG. 4 is a second schematic structural diagram of a voltage processing circuit according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of a smart key device according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a smart key device according to Embodiment 2 of the present invention.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • Connected, or integrally connected can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components.
  • the specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • the smart key device includes: a security chip, a first voltage dividing unit, a second voltage dividing unit, a voltage processing circuit, and an audio interface (which may be audio). plug).
  • One end of the first voltage dividing unit is respectively connected to the output end of the safety chip and the power supply (VCC), and the other end is connected to the input end of the second voltage dividing unit and the voltage processing circuit respectively; one end of the second voltage dividing unit and the first minute The voltage unit is connected and the other end is grounded; the two output terminals of the voltage processing circuit are respectively connected to the microphone pin (MIC) and the ground pin (GND) of the audio interface (the left channel tube of the audio interface is not shown in FIG. 1) Foot and right channel pins).
  • the voltage consumed by the first voltage dividing unit is greater than the voltage consumed by the second voltage dividing unit.
  • the grounded end of the second voltage dividing unit can be connected to the grounding pin of the audio interface, that is, the grounded end of the second voltage dividing unit is shared with the grounding pin of the audio interface, thereby reducing welding. Point to reduce the size of the board.
  • the audio interface of the smart key device may be provided by the smart key device itself, and the smart key device may further include a USB interface, and the audio interface is connected through the extension cable.
  • the security chip, the first voltage dividing unit and the second voltage dividing unit constitute an audio uplink signal generating device, and the voltage processing circuit is configured to attenuate the uplink signal sent by the audio uplink signal generating device, and the audio uplink signal passes through the first voltage dividing unit, After the two-divider unit and the voltage processing circuit, the appropriate signal amplitude is obtained and sent to the terminal to realize the uplink of the audio signal. transmission.
  • the first voltage dividing unit and the second voltage dividing unit are power consuming components, such as resistors and/or diodes.
  • the circuit shown in FIG. 2 will be described below as an example.
  • FIG. 2 is a schematic structural diagram of a smart key device according to Embodiment 1 of the present invention.
  • a resistor is used as a voltage dividing unit as an example.
  • the first voltage dividing unit is a resistor R1
  • the second voltage dividing unit is Resistor R2.
  • One end of the resistor R1 is respectively connected to the output end of the safety chip and the power source, and the other end is connected to the resistor R2 and the input end of the voltage processing circuit respectively; one end of the resistor R2 is connected to the resistor R1, and the other end is grounded.
  • the resistance of the resistor R1 is greater than the resistance of the resistor R2, that is, the voltage consumed by R1 is greater than the voltage consumed by R2, and the ratio of the resistor R1 to the resistor R2 is not specifically limited.
  • the voltage division by the resistor reduces the amplitude of the signal voltage input to the voltage processing circuit, and further reduces the voltage amplitude input to the microphone pin of the audio interface through the voltage processing circuit, when the audio plug of the smart key device is inserted into the terminal
  • the microphone pin of the audio plug is connected to the microphone pin of the audio jack, that is, the voltage amplitude of the signal received by the microphone pin of the terminal audio jack is reduced, thereby ensuring that the AD sampling range is not exceeded and avoiding Overshoot phenomenon.
  • the first voltage dividing unit and the second voltage dividing unit are not limited to the circuit shown in FIG. 2, as long as the circuit capable of achieving voltage dividing by the power consuming element is within the scope of the present invention, for example,
  • the first voltage dividing unit and the second voltage dividing unit are respectively a resistor and a diode.
  • the voltage processing circuit includes: a first processing circuit and a second processing circuit, wherein the first processing circuit and the second processing circuit are mutually attenuating circuits, and an input end of the first processing circuit is connected to an input end of the second processing circuit (ie, the first processing The circuit and the second processing circuit have a common input terminal, and the output end of the first processing circuit and the output end of the second processing circuit are respectively connected to the microphone pin and the ground pin of the audio interface.
  • the first processing circuit may employ a filter circuit and/or a voltage dividing circuit
  • the second processing circuit may employ a filter circuit and/or a voltage dividing circuit, which will be separately described below in conjunction with FIGS. 3 and 4.
  • the voltage processing circuit can be implemented by a voltage dividing circuit, including a capacitor C1, a capacitor C2, and a capacitor C3.
  • the audio uplink signal generating device composed of the security chip, the first voltage dividing unit and the second voltage dividing unit is connected to the microphone pin of the audio interface through the capacitor C1 and the capacitor C2, and is connected to the ground of the audio interface through the capacitor C1 and the capacitor C3. Pin.
  • the first processing circuit includes C1 and C2
  • the second processing circuit includes C1 and C3.
  • the audio signal after being divided by the first voltage dividing unit and the second voltage dividing unit (that is, the audio uplink signal sent by the smart key device to the terminal) is further divided by C1 and C2, and the signal amplitude is reduced, and sent to the microphone.
  • the pin, and thus the amplitude of the audio signal received by the terminal does not exceed the AD sampling range.
  • the voltage processing circuit can be a symmetric circuit, that is, the capacitance of C2 and C3 is equivalent; or it can be an asymmetric circuit, that is, the capacitances of C2 and C3 are not equal.
  • a resistor to implement a voltage divider circuit.
  • a resistor is used to achieve the division.
  • the voltage circuit can be a symmetrical circuit or an asymmetric circuit, which will not be described here.
  • the voltage processing circuit is implemented by a filter circuit, and includes a capacitor C4, a resistor R3, and a resistor R4.
  • the audio uplink signal generating device composed of the security chip, the first voltage dividing unit and the second voltage dividing unit is connected to the microphone pin through the capacitor C4 and the resistor R3, and is connected to the ground pin through the capacitor C4 and the resistor R4.
  • the first processing circuit includes C4 and R3, and the second processing circuit includes C4 and R4.
  • the audio signal after being divided by the first voltage dividing unit and the second voltage dividing unit (that is, the audio uplink signal sent by the smart key device to the terminal) is further filtered by C4 and R3, and the signal amplitude is reduced, and sent to the microphone tube.
  • the foot, and thus the amplitude of the audio signal received by the terminal does not exceed the AD sampling range.
  • the voltage processing circuit can be a symmetric circuit or an asymmetric circuit.
  • the voltage processing circuit is not limited to the circuit shown in FIG. 3 and FIG. 4 in the present embodiment, as long as the circuit capable of achieving the attenuation purpose is within the scope of the present invention.
  • the voltage processing circuit can also be implemented by a combination of a filter circuit and a voltage dividing circuit.
  • the smart key device provided in this embodiment divides the audio uplink signal to be sent by the first voltage dividing unit and the second voltage dividing unit, and further reduces the microphone pin input to the audio interface of the smart key device through the voltage processing circuit.
  • the magnitude of the voltage on the voltage that is, the voltage amplitude of the signal received by the microphone pin of the terminal audio interface, ensures that the AD sampling range is not exceeded and overshoot is avoided.
  • the smart key device of the embodiment includes three voltage dividing units.
  • the voltage dividing unit is a power consuming component, such as a resistor and/or a diode.
  • the smart key device of this embodiment includes: a security chip, a first voltage dividing unit, a second voltage dividing unit, a third voltage dividing unit, a voltage processing circuit, and an audio interface.
  • One end of the first voltage dividing unit is connected to the power source (VCC), and the other end is connected to the second voltage dividing unit and the output end of the safety chip respectively; one end of the second voltage dividing unit is connected to the first voltage dividing unit, and the other end is respectively connected with
  • the third voltage dividing unit is connected to the input end of the voltage processing circuit; one end of the third voltage dividing unit is connected to the second voltage dividing unit, and the other end is grounded; the two output ends of the voltage processing circuit are respectively connected with the microphone pins of the audio interface The grounding pins are connected.
  • the voltage consumed by the first voltage dividing unit is equal to the sum of the voltage consumed by the second voltage dividing unit and the voltage consumed by the third voltage dividing unit, and the voltage consumed by the second voltage dividing unit is greater than the voltage consumed by the
  • the grounded end of the third voltage dividing unit can be connected to the grounding pin of the audio interface, that is, the grounded end of the third voltage dividing unit is shared with the grounding pin of the audio interface, thereby reducing welding. Point to reduce the size of the board.
  • the voltage dividing unit is described as an example.
  • the first voltage dividing unit is a resistor R1
  • the second voltage dividing unit is a resistor R2
  • the third voltage dividing unit is a resistor R3.
  • One end of R1 is connected to the power supply (VCC), and the other end is connected to R2 and the output end of the security chip respectively;
  • one end of R2 is connected to R1, and the other end is connected to the input end of R3 and the voltage processing circuit respectively;
  • one end of R3 is connected with R2 The other end is grounded.
  • the resistance of R1 is equal to the sum of the resistance values of R2 and R3, and the resistance of R2 is greater than the resistance of R3, that is, the voltage consumed by R1 is equal to the sum of the voltage consumed by R2 and the voltage consumed by R3, and the voltage consumed by R2 is greater than the consumption of R3.
  • the voltage, the ratio of R2 to R3 is not specifically limited.
  • the first voltage dividing unit, the second voltage dividing unit, and the third voltage dividing unit are not limited to the circuit shown in FIG. 6, as long as the circuit capable of achieving voltage dividing by the power consuming element is used as the present invention.
  • the voltage processing circuit is the same as that in the first embodiment, and details are not described herein again.
  • the smart key device provided in this embodiment divides the audio uplink signal to be sent by the first voltage dividing unit, the second voltage dividing unit, and the third voltage dividing unit, and further reduces the input to the smart key device through the voltage processing circuit.
  • the voltage amplitude on the microphone pin of the audio interface reduces the voltage amplitude of the signal received by the microphone pin of the terminal audio interface, thereby ensuring that the AD sampling range is not exceeded and overshoot is avoided.
  • the voltage consumed by the first voltage dividing unit is equal to the sum of the voltage consumed by the second voltage dividing unit and the voltage consumed by the third voltage dividing unit, so that the voltage value at the junction of the first voltage dividing unit and the output end of the safety chip is 0.5. VCC, so that voltage rise can be avoided and DC jitter occurs.
  • the present embodiment provides an audio signal transmission system, which includes a smart key device and a terminal with an audio interface, wherein the smart key device is the smart key device described in the first embodiment or the second embodiment.
  • the audio interface of the smart key device matches the audio interface of the terminal, and the smart key device is connected to and communicates with the terminal through its audio interface.
  • each pin of the audio interface (which may be an audio plug) of the smart key device (Left channel pins, right channel pins, microphone pins, and ground pins) are respectively connected to corresponding pins of the terminal's audio interface (which can be an audio jack) to achieve normal data transmission.
  • the voltage amplitude of the audio signal received by the terminal does not exceed the AD sampling range, thereby avoiding overshoot.
  • the terminal can be a device with an audio interface such as a laptop, a tablet, a mobile phone, a smart watch, or a smart glasses.
  • portions of the invention may be implemented in hardware, software, firmware or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuit, ASIC with suitable combinational logic gate, Programmable Gate Array (PGA), now Field programmable gate array (FPGA), etc.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Telephone Function (AREA)

Abstract

本发明公开了一种智能密钥设备及音频信号传输系统，该智能密钥设备包括：安全芯片、第一分压单元、第二分压单元、电压处理电路和音频接口，第一分压单元的一端分别与安全芯片的输出端以及电源相连，另一端分别与第二分压单元以及电压处理电路的输入端相连；第二分压单元的一端与第一分压单元相连，另一端接地；电压处理电路的两个输出端分别与音频接口的麦克管脚和地线管脚相连；第一分压单元消耗的电压大于第二分压单元消耗的电压。通过分压单元和电压处理电路降低终端音频接口接收的信号电压幅值，使其不超出AD采样范围，避免过冲现象的发生。

Description

智能密钥设备及音频信号传输系统 技术领域
本发明涉及电子技术领域，尤其涉及一种智能密钥设备及音频信号传输系统。
背景技术
目前，智能密钥设备(key)与手机、平板电脑等终端可以通过音频接口进行通信。智能密钥设备与终端通过音频接口连接后，向终端发送音频信号，终端需要对接收的音频信号进行AD(Alternate-Direct)采样。如果电压幅值过大，超出AD采样范围，会出现过冲，导致采样得到的信号与原始发送的音频信号相比有所失真，进而终端不能得到正确的信号，数据传输失败。
发明内容
本发明提供了一种智能密钥设备及音频信号传输系统，以至少解决上述问题之一。
本发明的技术方案具体是这样实现的：
根据本发明的一个方面，提供了一种智能密钥设备，包括：安全芯片、第一分压单元、第二分压单元、电压处理电路和音频接口，所述第一分压单元的一端分别与所述安全芯片的输出端以及电源相连，另一端分别与所述第二分压单元以及所述电压处理电路的输入端相连；所述第二分压单元的一端与所述第一分压单元相连，另一端接地；所述电压处理电路的两个输出端分别与所述音频接口的麦克管脚和地线管脚相连；其中，所述第一分压单元消耗的电压大于所述第二分压单元消耗的电压。
此外，所述电压处理电路包括：第一处理电路和第二处理电路，所述第一处理电路和所述第二处理电路互为衰减电路，所述第一处理电路的输入端与所述第二处理电路的输入端相连。
此外，所述第一处理电路采用滤波电路和/或分压电路，所述第二处理电路采用滤波电路和/或分压电路。
根据本发明的另一个方面，提供了一种智能密钥设备，包括：安全芯片、第一分压单元、第二分压单元、第三分压单元、电压处理电路和音频接口，所述第一分压单元的一端与电源相连，另一端分别与所述第二分压单元以及所述安全芯片的输出端相连；所述第二分压单元的一端与所述第一分压单元相连，另一端分别与所述第三分压单元以及所述电压 处理电路的输入端相连；所述第三分压单元的一端与所述第二分压单元相连，另一端接地；所述电压处理电路的两个输出端分别与所述音频接口的麦克管脚和地线管脚相连；其中，所述第一分压单元消耗的电压等于所述第二分压单元消耗的电压与所述第三分压单元消耗的电压之和，且所述第二分压单元消耗的电压大于所述第三分压单元消耗的电压。
此外，所述电压处理电路包括：第一处理电路和第二处理电路，所述第一处理电路和所述第二处理电路互为衰减电路，所述第一处理电路的输入端与所述第二处理电路的输入端相连。
此外，所述第一处理电路采用滤波电路和/或分压电路，所述第二处理电路采用滤波电路和/或分压电路。
根据本发明的再一个方面，提供了一种音频信号传输系统，包括上述任一种智能密钥设备以及带有音频接口的终端，所述智能密钥设备的音频接口与所述终端的音频接口相匹配，所述智能密钥设备通过其音频接口与所述终端连接并进行通信。
由本发明提供的上述技术方案可以看出，本发明提供了一种智能密钥设备及音频信号传输系统，智能密钥设备通过分压单元对待发送的音频上行信号进行分压，并进一步通过电压处理电路降低输入到智能密钥设备音频接口的麦克管脚上的电压幅值，也就是降低了终端音频接口的麦克管脚接收的信号的电压幅值，使其不会超出AD采样范围，避免了过冲现象的出现。
附图说明
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是本发明实施例一提供的智能密钥设备的示意图；
图2是本发明实施例一提供的智能密钥设备的结构示意图；
图3是本发明实施例一提供的电压处理电路的结构示意图一；
图4是本发明实施例一提供的电压处理电路的结构示意图二；
图5是本发明实施例二提供的智能密钥设备的示意图；
图6是本发明实施例二提供的智能密钥设备的结构示意图。
具体实施方式
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。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或数量或位置。
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“安装”、“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，可以是两个元件内部的连通。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。
下面将结合附图对本发明实施例作进一步地详细描述。
实施例一
本实施例提供了一种智能密钥设备，如图1所示，该智能密钥设备包括：安全芯片、第一分压单元、第二分压单元、电压处理电路和音频接口(可以是音频插头)。
第一分压单元的一端分别与安全芯片的输出端以及电源(VCC)相连，另一端分别与第二分压单元以及电压处理电路的输入端相连；第二分压单元的一端与第一分压单元相连，另一端接地；电压处理电路的两个输出端分别与音频接口的麦克管脚(MIC)和地线管脚(GND)相连(图1中未示出音频接口的左声道管脚和右声道管脚)。第一分压单元消耗的电压大于第二分压单元消耗的电压。
需要说明的是，第二分压单元接地的那一端可以与音频接口的地线管脚相连，即第二分压单元接地的那一端与音频接口的地线管脚共地，这样可以减少焊点，减小电路板的体积。智能密钥设备的音频接口可以是智能密钥设备本身自带的，智能密钥设备还可以包括USB接口，通过转接线连接音频接口。
安全芯片、第一分压单元和第二分压单元构成音频上行信号发生装置，电压处理电路用于对音频上行信号发生装置发送的上行信号进行衰减，音频上行信号经过第一分压单元、第二分压单元和电压处理电路后，得到合适的信号幅值发送至终端，实现音频信号的上行 传输。
第一分压单元和第二分压单元是耗电元件，例如电阻和/或二极管等，下面以图2所示电路为例进行说明。
图2是本发明实施例一提供的智能密钥设备的结构示意图，如图2所示，以电阻作为分压单元为例进行说明，第一分压单元为电阻R1，第二分压单元为电阻R2。电阻R1的一端分别与安全芯片的输出端以及电源相连，另一端分别与电阻R2以及电压处理电路的输入端相连；电阻R2的一端与电阻R1相连，另一端接地。电阻R1的阻值大于电阻R2的阻值，即R1消耗的电压大于R2消耗的电压，电阻R1与电阻R2的比值并不做具体限定。
通过电阻进行分压，降低了输入到电压处理电路的信号电压幅值，进而通过电压处理电路进一步降低输入到音频接口的麦克管脚上的电压幅值，当智能密钥设备的音频插头插入终端的音频插口时，音频插头的麦克管脚与音频插口的麦克管脚相连，也就是降低了终端音频插口的麦克管脚接收的信号的电压幅值，从而保证不会超过AD采样范围，避免出现过冲现象。
当然，本实施例中第一分压单元和第二分压单元并不局限于图2所示的电路，只要通过耗电元件能实现分压目的的电路均作为本发明保护的范围，例如，第一分压单元与第二分压单元分别为电阻和二极管。
电压处理电路包括：第一处理电路和第二处理电路，第一处理电路和第二处理电路互为衰减电路，第一处理电路的输入端与第二处理电路的输入端相连(即第一处理电路和第二处理电路共输入端)，第一处理电路的输出端与第二处理电路的输出端则分别与音频接口的麦克管脚和地线管脚相连。
第一处理电路可以采用滤波电路和/或分压电路，第二处理电路可以采用滤波电路和/或分压电路，下面结合图3和图4分别进行说明。
如图3所示，电压处理电路可以采用分压电路实现，包括电容C1、电容C2和电容C3。由安全芯片、第一分压单元和第二分压单元构成的音频上行信号发生装置通过电容C1和电容C2连接至音频接口的麦克管脚，通过电容C1和电容C3连接至音频接口的地线管脚。在图3中，第一处理电路包括C1和C2，第二处理电路包括C1和C3。经过第一分压单元和第二分压单元分压后的音频信号(即智能密钥设备向终端发送的音频上行信号)进一步通过C1和C2的分压，信号幅值变小，发送至麦克管脚，进而保证终端接收的音频信号的幅值不会超出AD采样范围。
电压处理电路可以为对称电路，即C2和C3的电容等效；也可以为非对称电路，即C2和C3的电容不等。当然，还可以采用电阻实现分压电路，同样的，采用电阻实现的分 压电路可以是对称电路，也可以是非对称电路，此处不再赘述。
如图4所示，电压处理电路采用滤波电路实现，包括电容C4、电阻R3和电阻R4。由安全芯片、第一分压单元和第二分压单元构成的音频上行信号发生装置通过电容C4和电阻R3连接至麦克管脚，通过电容C4和电阻R4连接至地线管脚。在图4中，第一处理电路包括C4和R3，第二处理电路包括C4和R4。经过第一分压单元和第二分压单元分压后的音频信号(即智能密钥设备向终端发送的音频上行信号)进一步通过C4和R3的滤波，信号幅值变小，发送至麦克管脚，进而保证终端接收的音频信号的幅值不会超出AD采样范围。电压处理电路可以为对称电路，也可以为非对称电路。
当然，电压处理电路并不局限于本实施例中图3和图4所示的电路，只要能实现衰减目的的电路均作为本发明保护的范围。另外，电压处理电路也可以采用滤波电路和分压电路结合的方式实现。
本实施例提供的智能密钥设备通过第一分压单元和第二分压单元对待发送的音频上行信号进行分压，并进一步通过电压处理电路降低输入到智能密钥设备音频接口的麦克管脚上的电压幅值，也就是降低了终端音频接口的麦克管脚接收的信号的电压幅值，从而保证不会超过AD采样范围，避免出现过冲现象。
实施例二
本实施例与实施例一的区别在于，本实施例的智能密钥设备包括三个分压单元，同样的，分压单元是耗电元件，例如电阻和/或二极管等。
如图5所示，本实施例的智能密钥设备包括：安全芯片、第一分压单元、第二分压单元、第三分压单元、电压处理电路和音频接口。第一分压单元的一端与电源(VCC)相连，另一端分别与第二分压单元以及安全芯片的输出端相连；第二分压单元的一端与第一分压单元相连，另一端分别与第三分压单元以及电压处理电路的输入端相连；第三分压单元的一端与第二分压单元相连，另一端接地；电压处理电路的两个输出端分别与音频接口的麦克管脚和地线管脚相连。第一分压单元消耗的电压等于第二分压单元消耗的电压与第三分压单元消耗的电压之和，且第二分压单元消耗的电压大于第三分压单元消耗的电压。
需要说明的是，第三分压单元接地的那一端可以与音频接口的地线管脚相连，即第三分压单元接地的那一端与音频接口的地线管脚共地，这样可以减少焊点，减小电路板的体积。
下面以图6所示电路为例进行说明。
图6是本发明实施例二提供的智能密钥设备的结构示意图，如图6所示，以电阻作为 分压单元为例进行说明，第一分压单元为电阻R1，第二分压单元为电阻R2，第三分压单元为电阻R3。R1的一端与电源(VCC)相连，另一端分别与R2以及安全芯片的输出端相连；R2的一端与R1相连，另一端分别与R3以及电压处理电路的输入端相连；R3的一端与R2相连，另一端接地。R1的阻值等于R2与R3阻值之和，且R2的阻值大于R3的阻值，即R1消耗的电压等于R2消耗的电压与R3消耗的电压之和，且R2消耗的电压大于R3消耗的电压，R2与R3的比值并不做具体限定。
当然，本实施例中第一分压单元、第二分压单元和第三分压单元并不局限于图6所示的电路，只要通过耗电元件能实现分压目的的电路均作为本发明保护的范围。
电压处理电路与实施例一中相同，此处不再赘述。
本实施例提供的智能密钥设备通过第一分压单元、第二分压单元和第三分压单元对待发送的音频上行信号进行分压，并进一步通过电压处理电路降低输入到智能密钥设备音频接口的麦克管脚上的电压幅值，也就是降低了终端音频接口的麦克管脚接收的信号的电压幅值，从而保证不会超过AD采样范围，避免出现过冲现象。另外，第一分压单元消耗的电压等于第二分压单元消耗的电压与第三分压单元消耗的电压之和，使得第一分压单元与安全芯片的输出端的连接处的电压值为0.5VCC，从而可以避免电压抬升，出现直流抖动。
实施例三
本实施例提供了一种音频信号传输系统，该系统包括智能密钥设备和带有音频接口的终端，其中，智能密钥设备是实施例一或实施例二描述的智能密钥设备。智能密钥设备的音频接口与终端的音频接口相匹配，智能密钥设备通过其音频接口与终端连接并进行通信，具体的，智能密钥设备的音频接口(可以是音频插头)的各个管脚(左声道管脚、右声道管脚、麦克管脚和地线管脚)分别与终端的音频接口(可以是音频插口)的对应管脚连接，以实现正常的数据传输。并且，音频信号通过该智能密钥设备中的电路处理后，可以保证终端接收的音频信号的电压幅值不会超过AD采样范围，避免出现过冲现象。
终端可以是笔记本电脑、平板电脑、手机、智能手表、智能眼镜等带有音频接口的设备。
应当理解，本发明的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现 场可编程门阵列(FPGA)等。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在不脱离本发明的原理和宗旨的情况下在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。本发明的范围由所附权利要求及其等同限定。

Claims (12)

  1. 一种智能密钥设备，其特征在于，包括：安全芯片、第一分压单元、第二分压单元、电压处理电路和音频接口，
    所述第一分压单元的一端分别与所述安全芯片的输出端以及电源相连，另一端分别与所述第二分压单元以及所述电压处理电路的输入端相连；
    所述第二分压单元的一端与所述第一分压单元相连，另一端接地；
    所述电压处理电路的两个输出端分别与所述音频接口的麦克管脚和地线管脚相连；
    其中，所述第一分压单元消耗的电压大于所述第二分压单元消耗的电压。
  2. 根据权利要求1所述的智能密钥设备，其特征在于，所述电压处理电路包括：第一处理电路和第二处理电路，所述第一处理电路和所述第二处理电路互为衰减电路，所述第一处理电路的输入端与所述第二处理电路的输入端相连。
  3. 根据权利要求2所述的智能密钥设备，其特征在于，所述第一处理电路采用滤波电路和/或分压电路，所述第二处理电路采用滤波电路和/或分压电路。
  4. 一种智能密钥设备，其特征在于，包括：安全芯片、第一分压单元、第二分压单元、第三分压单元、电压处理电路和音频接口，
    所述第一分压单元的一端与电源相连，另一端分别与所述第二分压单元以及所述安全芯片的输出端相连；
    所述第二分压单元的一端与所述第一分压单元相连，另一端分别与所述第三分压单元以及所述电压处理电路的输入端相连；
    所述第三分压单元的一端与所述第二分压单元相连，另一端接地；
    所述电压处理电路的两个输出端分别与所述音频接口的麦克管脚和地线管脚相连；
    其中，所述第一分压单元消耗的电压等于所述第二分压单元消耗的电压与所述第三分压单元消耗的电压之和，且所述第二分压单元消耗的电压大于所述第三分压单元消耗的电压。
  5. 根据权利要求4所述的智能密钥设备，其特征在于，所述电压处理电路包括：第一处理电路和第二处理电路，所述第一处理电路和所述第二处理电路互为衰减电路，所述第一处理电路的输入端与所述第二处理电路的输入端相连。
  6. 根据权利要求5所述的智能密钥设备，其特征在于，所述第一处理电路采用滤波电路和/或分压电路，所述第二处理电路采用滤波电路和/或分压电路。
  7. 一种音频信号传输系统，其特征在于，包括智能密钥设备以及带有音频接口的终端， 所述智能密钥设备的音频接口与所述终端的音频接口相匹配，所述智能密钥设备通过其音频接口与所述终端连接并进行通信，所述智能密钥设备包括：安全芯片、第一分压单元、第二分压单元、电压处理电路和音频接口，
    所述第一分压单元的一端分别与所述安全芯片的输出端以及电源相连，另一端分别与所述第二分压单元以及所述电压处理电路的输入端相连；
    所述第二分压单元的一端与所述第一分压单元相连，另一端接地；
    所述电压处理电路的两个输出端分别与所述音频接口的麦克管脚和地线管脚相连；
    其中，所述第一分压单元消耗的电压大于所述第二分压单元消耗的电压。
  8. 根据权利要求7所述的系统，其特征在于，所述电压处理电路包括：第一处理电路和第二处理电路，所述第一处理电路和所述第二处理电路互为衰减电路，所述第一处理电路的输入端与所述第二处理电路的输入端相连。
  9. 根据权利要求8所述的系统，其特征在于，所述第一处理电路采用滤波电路和/或分压电路，所述第二处理电路采用滤波电路和/或分压电路。
  10. 一种音频信号传输系统，其特征在于，包括智能密钥设备以及带有音频接口的终端，所述智能密钥设备的音频接口与所述终端的音频接口相匹配，所述智能密钥设备通过其音频接口与所述终端连接并进行通信，所述智能密钥设备包括：安全芯片、第一分压单元、第二分压单元、第三分压单元、电压处理电路和音频接口，
    所述第一分压单元的一端与电源相连，另一端分别与所述第二分压单元以及所述安全芯片的输出端相连；
    所述第二分压单元的一端与所述第一分压单元相连，另一端分别与所述第三分压单元以及所述电压处理电路的输入端相连；
    所述第三分压单元的一端与所述第二分压单元相连，另一端接地；
    所述电压处理电路的两个输出端分别与所述音频接口的麦克管脚和地线管脚相连；
    其中，所述第一分压单元消耗的电压等于所述第二分压单元消耗的电压与所述第三分压单元消耗的电压之和，且所述第二分压单元消耗的电压大于所述第三分压单元消耗的电压。
  11. 根据权利要求10所述的系统，其特征在于，所述电压处理电路包括：第一处理电路和第二处理电路，所述第一处理电路和所述第二处理电路互为衰减电路，所述第一处理电路的输入端与所述第二处理电路的输入端相连。
  12. 根据权利要求11所述的系统，其特征在于，所述第一处理电路采用滤波电路和/或分压电路，所述第二处理电路采用滤波电路和/或分压电路。
PCT/CN2015/071202 2014-01-28 2015-01-21 智能密钥设备及音频信号传输系统 WO2015113473A1 (zh)

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