Audio circuit assembly
阅读说明:本技术 音频电路组件 (Audio circuit assembly ) 是由 肖倩 孙君 王太诚 于 2018-07-13 设计创作,主要内容包括:一种音频电路组件,包括音频连接器、信号处理单元、第一滤波单元及静电防护单元。所述音频连接器用于与外设音频设备进行插接。所述信号处理单元电连接于所述音频连接器,用于输出第一音频信号至所述音频连接器或接收所述音频连接器输入的第二音频信号。所述第一滤波单元电连接于所述信号处理单元与所述音频连接器之间,用于滤除所述第一音频信号或所述第二音频信号中包含的噪声信号。所述静电防护单元电连接于所述第一滤波单元与所述音频连接器的公共端,用于对所述信号处理单元及所述第一滤波单元进行静电防护。上述音频电路组件,可有效地避免噪音干扰及静电损害。(An audio circuit assembly comprises an audio connector, a signal processing unit, a first filtering unit and an electrostatic protection unit. The audio connector is used for being plugged with peripheral audio equipment. The signal processing unit is electrically connected to the audio connector and is used for outputting a first audio signal to the audio connector or receiving a second audio signal input by the audio connector. The first filtering unit is electrically connected between the signal processing unit and the audio connector and is used for filtering noise signals contained in the first audio signal or the second audio signal. The electrostatic protection unit is electrically connected to the first filtering unit and the common end of the audio connector and is used for performing electrostatic protection on the signal processing unit and the first filtering unit. The audio circuit assembly can effectively avoid noise interference and electrostatic damage.)
1. An audio circuit assembly comprising an audio connector for mating with a peripheral audio device, the audio circuit assembly further comprising:
the signal processing unit is electrically connected with the audio connector and is used for outputting a first audio signal to the audio connector or receiving a second audio signal input by the audio connector;
the first filtering unit is electrically connected between the signal processing unit and the audio connector and is used for filtering noise signals contained in the first audio signal or the second audio signal; and
and the electrostatic protection unit is electrically connected with the first filtering unit and the public end of the audio connector and is used for performing electrostatic protection on the signal processing unit and the first filtering unit.
2. The audio circuit assembly of claim 1, wherein the signal processing unit comprises an audio processing chip, the audio processing chip comprises a left channel signal pin and a right channel signal pin, and the left channel signal pin and the right channel signal pin are electrically connected to the first filtering unit, respectively.
3. The audio circuit assembly of claim 2, wherein the first filtering unit comprises:
one end of the first capacitor is electrically connected to the left channel signal pin;
one end of the first resistor is electrically connected to the other end of the first capacitor, and the other end of the first resistor is electrically connected to a left sound channel pin of the audio connector;
one end of the second capacitor is electrically connected to the right channel signal pin; and
and one end of the second resistor is electrically connected to the other end of the second capacitor, and the other end of the second resistor is electrically connected to the right sound channel pin of the audio connector.
4. The audio circuit assembly of claim 3, wherein the first filter unit further comprises a first magnetic bead electrically connected between the first resistor and the left channel pin and a second magnetic bead electrically connected between the second resistor and the right channel pin.
5. The audio circuit assembly of claim 3, wherein the electrostatic protection unit comprises:
one end of the first TVS tube is electrically connected to the common end of the first resistor and the audio connector, and the other end of the first TVS tube is grounded; and
and one end of the second TVS tube is electrically connected to the common end of the second resistor and the audio connector, and the other end of the second TVS tube is grounded.
6. The audio circuit assembly of claim 5, further comprising a second filtering unit, wherein the second filtering unit comprises a third capacitor and a fourth capacitor, one end of the third capacitor is electrically connected to the common terminal of the first TVS transistor and the first resistor, the other end of the third capacitor is grounded, one end of the fourth capacitor is electrically connected to the common terminal of the second TVS transistor and the second resistor, and the other end of the fourth capacitor is grounded.
7. The audio circuit assembly of claim 6, wherein the capacitance value of the third capacitor is substantially less than the capacitance value of the first capacitor, and the capacitance value of the fourth capacitor is substantially less than the capacitance value of the second capacitor.
8. The audio circuit assembly of claim 3, wherein the electrostatic protection unit comprises:
the cathode of the first voltage-stabilizing tube is electrically connected with the common end of the first resistor and the audio connector;
one end of the third resistor is electrically connected to the anode of the first voltage-stabilizing tube, and the other end of the third resistor is grounded;
the cathode of the second voltage-regulator tube is electrically connected with the common end of the second resistor and the audio connector; and
and one end of the fourth resistor is electrically connected to the anode of the second voltage-regulator tube, and the other end of the fourth resistor is grounded.
Technical Field
The invention relates to the technical field of electronic equipment, in particular to an audio circuit assembly with an electrostatic protection function.
Background
With the rapid development of modern electronic technologies and integrated circuits, electronic devices are becoming more miniaturized, multifunctional, and intelligent. Various electronic products have audio playing functions, such as mobile phones, portable multimedia players, notebook computers, desktop computers, radios, and the like. These electronic products are generally provided with an earphone interface, so that Static electricity can easily enter a gateway of the whole electronic device, and the harm of electro Static discharge (esd) needs to be reduced to ensure high audio quality of the electronic device.
Disclosure of Invention
In view of the above, there is a need for an audio circuit assembly that effectively eliminates ESD damage.
An embodiment of the present invention provides an audio circuit assembly, which includes an audio connector for plugging with a peripheral audio device. The audio circuit assembly further comprises: the signal processing unit is electrically connected with the audio connector and is used for outputting a first audio signal to the audio connector or receiving a second audio signal input by the audio connector; the first filtering unit is electrically connected between the signal processing unit and the audio connector and is used for filtering noise signals contained in the first audio signal or the second audio signal; and the electrostatic protection unit is electrically connected with the first filtering unit and the public end of the audio connector and is used for performing electrostatic protection on the signal processing unit and the first filtering unit.
Preferably, the signal processing unit includes an audio processing chip, the audio processing chip includes a left channel signal pin and a right channel signal pin, and the left channel signal pin and the right channel signal pin are electrically connected to the first filtering unit, respectively.
Preferably, the first filtering unit includes: one end of the first capacitor is electrically connected to the left channel signal pin; one end of the first resistor is electrically connected to the other end of the first capacitor, and the other end of the first resistor is electrically connected to a left sound channel pin of the audio connector; one end of the second capacitor is electrically connected to the right channel signal pin; and one end of the second resistor is electrically connected to the other end of the second capacitor, and the other end of the second resistor is electrically connected to the right sound channel pin of the audio connector.
Preferably, the first filter unit further includes a first magnetic bead and a second magnetic bead, the first magnetic bead is electrically connected between the first resistor and the left channel pin, and the second magnetic bead is electrically connected between the second resistor and the right channel pin.
Preferably, the electrostatic protection unit includes: one end of the first TVS tube is electrically connected to the common end of the first resistor and the audio connector, and the other end of the first TVS tube is grounded; and one end of the second TVS tube is electrically connected with the common end of the second resistor and the audio connector, and the other end of the second TVS tube is grounded.
Preferably, the filter further includes a second filtering unit, the second filtering unit includes a third capacitor and a fourth capacitor, one end of the third capacitor is electrically connected to a common end of the first TVS tube and the first resistor, the other end of the third capacitor is grounded, one end of the fourth capacitor is electrically connected to a common end of the second TVS tube and the second resistor, and the other end of the fourth capacitor is grounded.
Preferably, the capacitance value of the third capacitor is much smaller than that of the first capacitor, and the capacitance value of the fourth capacitor is much smaller than that of the second capacitor.
Preferably, the electrostatic protection unit includes: the cathode of the first voltage-stabilizing tube is electrically connected with the common end of the first resistor and the audio connector; one end of the third resistor is electrically connected to the anode of the first voltage-stabilizing tube, and the other end of the third resistor is grounded; the cathode of the second voltage-regulator tube is electrically connected with the common end of the second resistor and the audio connector; and one end of the fourth resistor is electrically connected to the anode of the second voltage-stabilizing tube, and the other end of the fourth resistor is grounded.
Compared with the prior art, the audio circuit assembly can effectively avoid noise interference and electrostatic damage, improves the tone quality and stability of audio products, and is low in cost.
Drawings
FIG. 1 is a diagram of an operating environment of an audio circuit assembly according to an embodiment of the present invention.
Fig. 2 is a functional block diagram of one embodiment of an audio circuit assembly of the present invention.
Fig. 3 is a circuit diagram of an embodiment of an audio circuit assembly of the present invention.
Fig. 4 is a circuit diagram of another embodiment of the audio circuit assembly of the present invention.
Description of the main elements
10
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30
40
50
100
200
300
First to fourth capacitors
C1、C2、C3、C4
First to fourth resistors
R1、R2、R3、R4
First to second magnetic beads
FB1、FB2
First to second TVS tubes
D11、D12
First to second voltage regulator tubes
D21、D22
Left sound track pin
LP1
Right sound channel pin
RP1
Grounding pin
GND
Audio processing chip
U1
Left sound channel signal pin
LL1
Right sound channel signal pin
LR1
Detailed Description
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Referring to fig. 1-2, an embodiment of the invention provides an
The
In one embodiment, the
The
In an embodiment, the
The
The
In an embodiment, the
Fig. 3 is a circuit diagram of an
The
The
In one embodiment, the capacitance of the third capacitor C3 is much smaller than that of the first capacitor C1, and the capacitance of the fourth capacitor C4 is much smaller than that of the second capacitor C2. The capacitance value of the first capacitor C1 is preferably 22uF, and the capacitance value of the third capacitor C3 is preferably 470 PF. The capacitance value of the second capacitor C2 is preferably 22uF, and the capacitance value of the fourth capacitor C4 is preferably 470 PF.
In one embodiment, the
In one embodiment, the first TVS tube D11 and the second TVS tube D12 are preferably bidirectional TVS tubes.
In an embodiment, the
The audio circuit assembly can effectively avoid noise interference and electrostatic damage, improves the tone quality and stability of audio products, and has low cost.
It will be apparent to those skilled in the art that other variations and modifications may be made in accordance with the invention and its spirit and scope in accordance with the practice of the invention disclosed herein.
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