CN110719547A - Audio circuit assembly - Google Patents

Audio circuit assembly Download PDF

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Publication number
CN110719547A
CN110719547A CN201810772382.8A CN201810772382A CN110719547A CN 110719547 A CN110719547 A CN 110719547A CN 201810772382 A CN201810772382 A CN 201810772382A CN 110719547 A CN110719547 A CN 110719547A
Authority
CN
China
Prior art keywords
audio
electrically connected
resistor
capacitor
circuit assembly
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810772382.8A
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Chinese (zh)
Inventor
肖倩
孙君
王太诚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hongfujin Precision Industry Wuhan Co Ltd
Hon Hai Precision Industry Co Ltd
Original Assignee
Hongfujin Precision Industry Wuhan Co Ltd
Hon Hai Precision Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hongfujin Precision Industry Wuhan Co Ltd, Hon Hai Precision Industry Co Ltd filed Critical Hongfujin Precision Industry Wuhan Co Ltd
Priority to CN201810772382.8A priority Critical patent/CN110719547A/en
Publication of CN110719547A publication Critical patent/CN110719547A/en
Pending legal-status Critical Current

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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

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

Abstract

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.

Description

Audio circuit assembly
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
Audio connector 10
Signal processing unit 20
First filter unit 30
Electrostatic protection unit 40
Second filter unit 50
Audio circuit assembly 100
Electronic device 200
Peripheral audio equipment 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 audio circuit assembly 100, which can be applied to an electronic device 200, where the electronic device 200 can be a mobile phone, a computer, a portable multimedia player, or other devices with an audio playing function.
The audio circuit assembly 100 includes an audio connector 10, a signal processing unit 20, a first filtering unit 30 and an electrostatic protection unit 40. The audio connector 10 is used for plugging with a peripheral audio device 300.
In one embodiment, the audio connector 10 is preferably a headphone jack, such as a 3.5mm standard headphone jack, a 2.5mm standard headphone jack, a Lightning Dock jack, or the like. The peripheral audio device 300 may be a headset, a microphone, a sound box, or the like.
The signal processing unit 20 is electrically connected to the audio connector 10, and the signal processing unit 20 is configured to output a first audio signal to the audio connector 10 or receive a second audio signal input by the audio connector 10.
In an embodiment, the signal processing unit 20 preferably includes an audio processing chip, and the audio processing chip can process the first audio signal and the second audio signal.
The first filtering unit 30 is electrically connected between the signal processing unit 20 and the audio connector 10, and the first filtering unit 30 is configured to filter noise signals included in the first audio signal or the second audio signal. The noise signal may include audio noise, electromagnetic interference noise, spike noise, and the like.
The electrostatic protection unit 40 is electrically connected to a common end of the first filtering unit 30 and the audio connector 10, and the electrostatic protection unit 40 is configured to perform electrostatic protection on the signal processing unit 20 and the first filtering unit 30. The electrostatic protection unit 40 can absorb the electrostatic pulse to implement electrostatic protection on the electronic component at the rear end.
In an embodiment, the audio circuit assembly 100 further includes a second filtering unit 50, and the second filtering unit 50 is electrically connected to a common end of the first filtering unit 30 and the electrostatic protection unit 40, and is configured to further filter an interference signal included in the first audio signal or the second audio signal, so as to improve high audio quality of the electronic device 200.
Fig. 3 is a circuit diagram of an audio circuit device 100 according to an embodiment of the invention.
The audio connector 10 includes a left channel pin LP1, a right channel pin RP1, and a ground pin GND. The ground pin GND is grounded. The signal processing unit 20 includes an audio processing chip U1, the audio processing chip U1 includes a left channel signal pin LL1 and a right channel signal pin LR1, the left channel signal pin LL1 is used for processing a left channel audio signal, and the right channel signal pin LR1 is used for processing a right channel audio signal. The first filtering unit 30 includes a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a first magnetic bead FB1, and a second magnetic bead FB 2. One end of the first capacitor C1 is electrically connected to the left channel signal pin LL1 of the audio processing chip U1, the other end of the first capacitor C1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to one end of the first magnetic bead FB1, and the other end of the first magnetic bead FB1 is electrically connected to the left channel pin LP1 of the audio connector 10. One end of the second capacitor C2 is electrically connected to the right channel signal pin LR1 of the audio processing chip U1, the other end of the second capacitor C2 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to one end of the second magnetic bead FB2, and the other end of the second magnetic bead FB2 is electrically connected to the right channel pin RP1 of the audio connector 10.
The second filtering unit 50 includes a third capacitor C3 and a fourth capacitor C4. One end of the third capacitor C3 is electrically connected to the common terminal of the first magnetic bead FB1 and the left channel pin LP1, and the other end of the third capacitor C3 is grounded. One end of the fourth capacitor C4 is electrically connected to the common terminal of the second magnetic bead FB2 and the right channel pin RP1, and the other end of the fourth capacitor C4 is grounded.
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 esd protection unit 40 includes a first TVS transistor D11 and a second TVS transistor D12. One end of the first TVS tube D11 is electrically connected to the common terminal of the third capacitor C3 and the left channel pin LP1, and the other end of the first TVS tube D11 is grounded. One end of the second TVS tube D12 is electrically connected to the common terminal of the fourth capacitor C4 and the right channel pin RP1, and the other end of the second TVS tube D12 is grounded. When an electrostatic high voltage pulse flows into the audio connector 10, the first TVS tube D11 and the second TVS tube D12 are subjected to avalanche, and an instantaneous current generated by the electrostatic high voltage pulse is led to the ground through the first TVS tube D11 and/or the second TVS tube D12, thereby implementing ESD protection on a rear-end component; after the transient high voltage pulse is over, the first TVS transistor D11 and the second TVS transistor D12 automatically return to the high impedance state, which does not affect the audio signal input/output of the audio circuit assembly 100.
In one embodiment, the first TVS tube D11 and the second TVS tube D12 are preferably bidirectional TVS tubes.
In an embodiment, the electrostatic protection unit 40 may also be a circuit structure as shown in fig. 4. The esd protection unit 40 includes a third resistor R3, a fourth resistor R4, a first regulator D21 and a second regulator D22. The cathode of the first voltage regulator tube D21 is electrically connected to the common end of the third capacitor C3 and the left channel pin LP1, the anode of the first voltage regulator tube D21 is electrically connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded. The cathode of the second voltage regulator tube D22 is electrically connected to the common end of the fourth capacitor C4 and the right channel pin RP1, the anode of the second voltage regulator tube D22 is electrically connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded. When electrostatic high-voltage pulses flow into the audio connector 10, the first voltage regulator tube D21 and the second voltage regulator tube D22 are subjected to avalanche, and instantaneous current generated by the electrostatic high-voltage pulses can be led to the ground through the first voltage regulator tube D21, the third resistor R3 and/or the second voltage regulator tube D22 and the fourth resistor R4, so that ESD protection is performed on rear-end components; after the transient high voltage pulse is over, the first and second voltage-regulator diodes D21 and D22 automatically return to a high-impedance state, and the input/output of the audio signal of the audio circuit module 100 is not affected.
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.

Claims (8)

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.
CN201810772382.8A 2018-07-13 2018-07-13 Audio circuit assembly Pending CN110719547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810772382.8A CN110719547A (en) 2018-07-13 2018-07-13 Audio circuit assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810772382.8A CN110719547A (en) 2018-07-13 2018-07-13 Audio circuit assembly

Publications (1)

Publication Number Publication Date
CN110719547A true CN110719547A (en) 2020-01-21

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CN201810772382.8A Pending CN110719547A (en) 2018-07-13 2018-07-13 Audio circuit assembly

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Country Link
CN (1) CN110719547A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022042138A1 (en) * 2020-08-31 2022-03-03 杭州海康威视数字技术股份有限公司 Audio processing system and network camera

Citations (10)

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Publication number Priority date Publication date Assignee Title
WO2004084580A1 (en) * 2003-03-20 2004-09-30 Bse Co., Ltd. Condenser microphone employing wide band stop filter and having improved resistance to electrostatic discharge
US20110116657A1 (en) * 2009-11-19 2011-05-19 Richtek Technology Corp. Electrostatic transducer loudspeaker
EP2515434A1 (en) * 2011-04-18 2012-10-24 Research In Motion Limited Electronic device with increased immunity to audio noise from system ground currents
CN203015094U (en) * 2012-12-26 2013-06-19 泉州豪杰信息科技发展有限公司 Audio frequency amplification circuit
CN103369430A (en) * 2012-04-02 2013-10-23 鸿富锦精密工业（深圳）有限公司 Earphone interface circuit and audio playing device
WO2014000556A1 (en) * 2012-06-29 2014-01-03 深圳凯虹移动通信有限公司 Earphone interface circuit and electronic equipment
CN203416396U (en) * 2013-07-12 2014-01-29 沈阳华立德电子科技有限公司 Intelligent terminal earphone association circuit
CN204741518U (en) * 2015-05-19 2015-11-04 深圳创维数字技术有限公司 Jam -proof control circuit
US20170223457A1 (en) * 2016-02-03 2017-08-03 Lg Electronics Inc. Main speaker, sub speaker and system including the same
CN107565530A (en) * 2017-08-31 2018-01-09 广东欧珀移动通信有限公司 Electrostatic protection apparatus, radio circuit and electronic equipment

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004084580A1 (en) * 2003-03-20 2004-09-30 Bse Co., Ltd. Condenser microphone employing wide band stop filter and having improved resistance to electrostatic discharge
US20110116657A1 (en) * 2009-11-19 2011-05-19 Richtek Technology Corp. Electrostatic transducer loudspeaker
EP2515434A1 (en) * 2011-04-18 2012-10-24 Research In Motion Limited Electronic device with increased immunity to audio noise from system ground currents
CN103369430A (en) * 2012-04-02 2013-10-23 鸿富锦精密工业（深圳）有限公司 Earphone interface circuit and audio playing device
WO2014000556A1 (en) * 2012-06-29 2014-01-03 深圳凯虹移动通信有限公司 Earphone interface circuit and electronic equipment
CN203015094U (en) * 2012-12-26 2013-06-19 泉州豪杰信息科技发展有限公司 Audio frequency amplification circuit
CN203416396U (en) * 2013-07-12 2014-01-29 沈阳华立德电子科技有限公司 Intelligent terminal earphone association circuit
CN204741518U (en) * 2015-05-19 2015-11-04 深圳创维数字技术有限公司 Jam -proof control circuit
US20170223457A1 (en) * 2016-02-03 2017-08-03 Lg Electronics Inc. Main speaker, sub speaker and system including the same
CN107565530A (en) * 2017-08-31 2018-01-09 广东欧珀移动通信有限公司 Electrostatic protection apparatus, radio circuit and electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022042138A1 (en) * 2020-08-31 2022-03-03 杭州海康威视数字技术股份有限公司 Audio processing system and network camera

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