CN206686365U - A kind of circuit of noise during suppression plug audio frequency apparatus - Google Patents
A kind of circuit of noise during suppression plug audio frequency apparatus Download PDFInfo
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- CN206686365U CN206686365U CN201720317997.2U CN201720317997U CN206686365U CN 206686365 U CN206686365 U CN 206686365U CN 201720317997 U CN201720317997 U CN 201720317997U CN 206686365 U CN206686365 U CN 206686365U
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Abstract
It the utility model is related to ear speaker device field, more particularly to a kind of circuit for suppressing the noise during plug audio frequency apparatus.In the circuit of noise during the suppression plug audio frequency apparatus of the present embodiment, the voltage status that voltage detecting circuit inserted/extracted audio frequency apparatus according to audio connector sends voltage change signal and is given to logic control circuit, the control chip U1 of logic control circuit has recognized audio connector insertion or extracted, comparator output high level is controlled immediately, single-pole double-throw switch (SPDT) recognizes the high level signal of comparator output, connection is turned off, so as to cut off audio signal of the output to loudspeaker.When audio connector inserts or extracted audio frequency apparatus, Current Voltage is during change, logic switch between loudspeaker is disconnected by control chip U1, cuts off audio output, is solved the problems, such as because occurring the sound of " puff puff " in loudspeaker caused by spread of voltage.
Description
Technical field
It the utility model is related to ear phone technology field, more particularly to a kind of noise suppressed during plug audio frequency apparatus
Circuit.
Background technology
With the fast development of mobile network and Intelligent mobile equipment, people become increasingly dependent on intelligence in work, life
Mobile device, in the public transport such as subway, public transport, high ferro, the public arena such as dining room, coffee-house, it is seen everywhere with earphone
Listen song or see the people of video.The audio frequency apparatus that earphone is commonly used as people, it is broadly divided into the simulation ear using 3.5mm interfaces
Machine, the digital earphone using lightning interfaces and the simulation earphone or digital earphone using TYPE-C interfaces.
But whether which kind of type the interface of earphone is, Earphone joint is being inserted audio frequency apparatus or from audio frequency apparatus
During taking off, because the position voltage that Earphone joint and audio frequency apparatus contact is unstable, the sound of " puff puff " is always heard
Sound, influence Consumer's Experience.
The content of the invention
The purpose of this utility model is to avoid above-mentioned weak point of the prior art and provide a kind of simple in construction, energy
It is enough to solve the problems, such as because occurring the circuit of the sound of " puff puff " in loudspeaker caused by spread of voltage.
The purpose of this utility model is achieved through the following technical solutions：
A kind of circuit for suppressing the noise during plug audio frequency apparatus, including audio connector, the sound being sequentially connected are provided
Audio signalprocessing circuit and loudspeaker, on-off circuit, institute are connected between the audio signal processing circuit and the loudspeaker
The signal input part for stating audio signal processing circuit is also associated with voltage detecting circuit, the signal output of the voltage detecting circuit
End is connected to the signal input part of the on-off circuit by logic control circuit；The voltage detecting circuit is according to the audio
The voltage status that joint inserted/extracted audio frequency apparatus sends voltage change signal and is given to logic control circuit, the logic control
Circuit sends control signal according to the voltage change signal received and is given to on-off circuit, and the on-off circuit is according to what is received
Control signal disconnects.
Wherein, the on-off circuit includes the comparator for being connected to the logic control circuit signal output part, Yi Jitong
The single-pole double-throw switch (SPDT) of the outputs level signals control of the comparator is crossed, the single-pole double-throw switch (SPDT) is connected to the audio letter
Number between process circuit and the loudspeaker.
Wherein, the signal output part of the logic control circuit is also associated with voltage hold circuit, and the voltage keeps electricity
The signal difference output end on road is connected to the signal input part of the loudspeaker.
Wherein, the full bridge driving circuit that the voltage hold circuit is made up of four FETs, the full-bridge driving
The positive and negative signal output part of circuit connects the positive and negative signal input part of the loudspeaker respectively.
Wherein, the logic control circuit includes control chip U1, and the full bridge driving circuit connects respectively including grid
To p-type FET Q1, Q2 and N-type FET Q3, Q4 of the signal output pin of the control chip U1, the p-type field
Effect pipe Q1, Q2 source electrode are connected to the positive pole of input voltage, described N-type FET Q3, Q4 source ground, the p-type
The positive signal input of the loudspeaker, the p-type field effect are connected to after FET Q1 and N-type FET Q4 drain electrode connection
The negative signal input of the loudspeaker should be connected to after pipe Q2 and N-type FET Q3 drain electrode connection.
Wherein, the audio connector is 3.5mm interfaces or TYPE-C analog interfaces.
Wherein, the audio signal processing circuit includes analog signal receiving circuit and D/A converting circuit.
Wherein, the audio connector is lightning interfaces or TYPE-C digital interfaces.
Wherein, the audio signal processing circuit includes digital signal receiving circuit and signal demodulating circuit.
The beneficial effects of the utility model：The circuit of noise during suppression plug audio frequency apparatus, is examined by voltage
Slowdown monitoring circuit detection audio connector inserts/extracted the voltage status of audio frequency apparatus, sends voltage change signal and is given to logic control electricity
Road, logic control circuit have recognized audio connector insertion or extracted, and controlling switch circuit disconnects immediately, so as to cut off
The audio signal to loudspeaker is exported, is solved because occurring asking for the sound of " puff puff " in loudspeaker caused by spread of voltage
Topic.And the circuit structure of the noise during suppression plug audio frequency apparatus is simple, easy processing and manipulation.
Brief description of the drawings
Fig. 1 be suppress plug audio frequency apparatus during noise circuit structural representation；
Fig. 2 be suppress plug audio frequency apparatus during noise circuit switching circuit structure schematic diagram；
Fig. 3 be suppress plug audio frequency apparatus during noise circuit voltage hold circuit structural representation.
Embodiment
The circuit of noise during the suppression plug audio frequency apparatus of the present embodiment is as shown in figure 1, including being sequentially connected
Audio connector, audio signal processing circuit, on-off circuit and loudspeaker, the signal input part of audio signal processing circuit are also connected with
There is a voltage detecting circuit, the signal that the signal output part of voltage detecting circuit is connected to on-off circuit by logic control circuit is defeated
Enter end.The signal output part of logic control circuit is also associated with voltage hold circuit as shown in Figure 3, the letter of voltage hold circuit
Number poor output end is connected to the signal input part of loudspeaker.For the simulation using 3.5mm interfaces or TYPE-C analog interfaces
Earphone, audio signal processing circuit include analog signal receiving circuit and signal demodulating circuit, and analog signal receiving circuit receives
Audio signal be transferred to loudspeaker after signal demodulating circuit enhanced processing；For using lightning interfaces or
The digital earphone of TYPE-C digital interfaces, audio signal processing circuit include digital signal receiving circuit and D/A converting circuit,
The audio signal that digital signal receiving circuit receives is after D/A converting circuit is converted to analog signal and reconciles enhanced processing
It is transferred to loudspeaker.
As shown in Fig. 2 on-off circuit includes the comparator for being connected to logic control circuit signal output part, and it is connected to
Single-pole double-throw switch (SPDT) between audio signal processing circuit and loudspeaker.Logic control circuit includes control chip U1, and voltage is protected
Hold the full bridge driving circuit that circuit is made up of four FETs, including grid be connected respectively to control chip U1 signal it is defeated
Go out p-type FET Q1, Q2 and N-type FET Q3, Q4 of pin, p-type FET Q1, Q2 source electrode are connected to input electricity
The positive pole of pressure, N-type FET Q3, Q4 source ground, after p-type FET Q1 and N-type FET Q4 drain electrode connects
The positive signal input of loudspeaker is connected to, loudspeaker is connected to after p-type FET Q2 and N-type FET Q3 drain electrode connection
Negative signal input.When voltage hold circuit works, under the pwm signal control of control chip U1 outputs, V1, V4 are led simultaneously
Lead to, or V2, V3 are simultaneously turned on, V1, V4 and V2, V3 alternate conductions, so as to be the signal of loudspeaker when logic switch disconnects
Input provides stable voltage.
When the moment audio connector insertion or extraction audio frequency apparatus, when audio connector is contacted or separated with audio frequency apparatus
Spread of voltage, the sound for occurring " puff puff " in loudspeaker can be caused.During the suppression plug audio frequency apparatus of the present embodiment
In the circuit of noise, the voltage status that voltage detecting circuit inserted/extracted audio frequency apparatus according to audio connector sends voltage change
Signal is given to logic control circuit, and the control chip U1 of logic control circuit has recognized audio connector insertion or extracted, stood
Comparator output high level is controlled, single-pole double-throw switch (SPDT) recognizes the high level signal of comparator output, turns off connection,
So as to cut off audio signal of the output to loudspeaker.When audio connector inserts or extracts audio frequency apparatus, Current Voltage is changing
During, the logic switch between loudspeaker is disconnected by control chip U1, cuts off audio output, solve because
Occurs the problem of sound of " puff puff " in loudspeaker caused by spread of voltage.Meanwhile control chip U1 keeps electricity by voltage
Road has added a stable voltage in the signal input part of loudspeaker, has served as 1 second or so, the voltage of audio connector part becomes
Logic switch is connected again when stablizing.The burning voltage size that voltage hold circuit applies detects close to voltage detecting circuit
The voltage swing arrived, this can reduce the surge voltage that logic switch connects moment, ensure electricity when logic switch is connected
Pressing is steady excessive, and improving causes occur the problem of sound of " puff puff " in loudspeaker because voltage difference is excessive.
The circuit of noise during the suppression plug audio frequency apparatus of the present embodiment, is detecting the electric current at audio jack
Cut off audio output during voltage change, and by voltage hold circuit be power speakers for a period of time, can thus mitigate electricity
Influence when current voltage changes to audio output, eliminate " puff puff " sound occurred in loudspeaker.
Claims (9)
1. it is a kind of suppress plug audio frequency apparatus during noise circuit, including be sequentially connected audio connector, audio signal
Process circuit and loudspeaker, it is characterised in that：Switch electricity is connected between the audio signal processing circuit and the loudspeaker
Road, the signal input part of the audio signal processing circuit are also associated with voltage detecting circuit, the letter of the voltage detecting circuit
Number output end is connected to the signal input part of the on-off circuit by logic control circuit；The voltage detecting circuit is according to institute
State audio connector and insert/extract the voltage status of audio frequency apparatus and send voltage change signal and be given to logic control circuit, it is described to patrol
Volume control circuit sends control signal according to the voltage change signal received and is given to on-off circuit, and the on-off circuit is according to receiving
The control signal disconnect.
2. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 1, it is characterised in that：Institute
The comparator that on-off circuit includes being connected to the logic control circuit signal output part is stated, and passes through the defeated of the comparator
Go out the single-pole double-throw switch (SPDT) of level signal control, the single-pole double-throw switch (SPDT) is connected to the audio signal processing circuit and described
Between loudspeaker.
3. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 1, it is characterised in that：Institute
The signal output part for stating logic control circuit is also associated with voltage hold circuit, the signal difference output end of the voltage hold circuit
It is connected to the signal input part of the loudspeaker.
4. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 3, it is characterised in that：Institute
State the full bridge driving circuit that voltage hold circuit is made up of four FETs, the positive and negative signal of the full bridge driving circuit
Output end connects the positive and negative signal input part of the loudspeaker respectively.
5. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 4, it is characterised in that：Institute
Stating logic control circuit includes control chip U1, and the full bridge driving circuit is connected respectively to the control chip U1 including grid
Signal output pin p-type FET Q1, Q2 and N-type FET Q3, Q4, described p-type FET Q1, Q2 source electrode
It is connected to the positive pole of input voltage, described N-type FET Q3, Q4 source ground, the p-type FET Q1 and N-type field
The positive signal input of the loudspeaker, the p-type FET Q2 and N-type field-effect are connected to after effect pipe Q4 drain electrode connection
The negative signal input of the loudspeaker is connected to after pipe Q3 drain electrode connection.
6. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 1, it is characterised in that：Institute
It is 3.5mm interfaces or TYPE-C analog interfaces to state audio connector.
7. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 6, it is characterised in that：Institute
Stating audio signal processing circuit includes analog signal receiving circuit and signal demodulating circuit.
8. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 1, it is characterised in that：Institute
It is lightning interfaces or TYPE-C digital interfaces to state audio connector.
9. the circuit of the noise during a kind of suppression plug audio frequency apparatus according to claim 8, it is characterised in that：Institute
Stating audio signal processing circuit includes digital signal receiving circuit and D/A converting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720317997.2U CN206686365U (en) | 2017-03-29 | 2017-03-29 | A kind of circuit of noise during suppression plug audio frequency apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720317997.2U CN206686365U (en) | 2017-03-29 | 2017-03-29 | A kind of circuit of noise during suppression plug audio frequency apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206686365U true CN206686365U (en) | 2017-11-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720317997.2U Active CN206686365U (en) | 2017-03-29 | 2017-03-29 | A kind of circuit of noise during suppression plug audio frequency apparatus |
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| Country | Link |
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| CN (1) | CN206686365U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381409A (en) * | 2019-08-13 | 2019-10-25 | 京东方科技集团股份有限公司 | A kind of control panel of display, its driving method and display |
| CN113110241A (en) * | 2021-05-13 | 2021-07-13 | 中科可控信息产业有限公司 | Electronic equipment and audio control method thereof |
| CN116962953A (en) * | 2023-09-21 | 2023-10-27 | 荣耀终端有限公司 | Equipment connection detection circuit, audio channel switching method and electronic equipment |
-
2017
- 2017-03-29 CN CN201720317997.2U patent/CN206686365U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381409A (en) * | 2019-08-13 | 2019-10-25 | 京东方科技集团股份有限公司 | A kind of control panel of display, its driving method and display |
| CN113110241A (en) * | 2021-05-13 | 2021-07-13 | 中科可控信息产业有限公司 | Electronic equipment and audio control method thereof |
| CN116962953A (en) * | 2023-09-21 | 2023-10-27 | 荣耀终端有限公司 | Equipment connection detection circuit, audio channel switching method and electronic equipment |
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