CN108200518A - A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise - Google Patents
A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise Download PDFInfo
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- CN108200518A CN108200518A CN201810184296.5A CN201810184296A CN108200518A CN 108200518 A CN108200518 A CN 108200518A CN 201810184296 A CN201810184296 A CN 201810184296A CN 108200518 A CN108200518 A CN 108200518A
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- 230000005236 sound signal Effects 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 2
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 108091006146 Channels Proteins 0.000 description 52
- 230000008030 elimination Effects 0.000 description 6
- 238000003379 elimination reaction Methods 0.000 description 6
- 238000004880 explosion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
-
- 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
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
A kind of voicefrequency circuit for eliminating powered on moment noise, it includes the audio socket with L channel terminal, right channel terminal and ground terminal, two switch modules being connect respectively with the L channel terminal of audio socket, right channel terminal, two Audio Input Modules being correspondingly connected with respectively with two switch modules, two audio output modules being correspondingly connected with respectively with two switch modules, it is connect with working power and two switch modules, the main control module also being connect with L channel terminal or right channel terminal.Voltage signal is powered on by detect audio socket, its conducting is driven by software control switch module again after voltage stabilization is powered on, effectively eliminate the noise of audio frequency apparatus powered on moment, improve acoustical quality, and it takes into account audio input, export optional, realization audio input, the shared audio socket of output.
Description
Technical field
The invention belongs to voicefrequency circuit technical field more particularly to a kind of voicefrequency circuits and sound for eliminating powered on moment noise
Frequency equipment.
Background technology
At present, display equipment can facilitate connection earphone or sound equipment with audio output, still, audio output power on it is (logical
Electricity) or upper signal moment, the supply voltage of feeder ear would generally generate acute variation, cause to show the audio in equipment
Output sends out explosion noise in powered on moment, so as to influence acoustical quality.
Therefore, the audio output deposited in traditional technical solution on the display device sends out explosion noise in powered on moment
Problem.
Invention content
The present invention provides a kind of voicefrequency circuit for eliminating powered on moment noise, it is intended to solve to exist in traditional technical solution
Audio frequency apparatus on audio output powered on moment sends out explosion noise the problem of.
The invention is realized in this way a kind of voicefrequency circuit for eliminating powered on moment noise, including：
Audio socket with L channel terminal, right channel terminal and ground terminal；
Two connect respectively with the L channel terminal of the audio socket, right channel terminal, for controlling audio signal defeated
Enter the switch module of output；
Two are correspondingly connected with respectively with two switch modules, for the Audio Input Modules of input audio signal；
Two are correspondingly connected with respectively with two switch modules, for the audio output module of exports audio signal；
It connect with working power and two switch modules, also connects with the L channel terminal or the right channel terminal
It connects, detects powering on voltage signal and voltage signal control two being powered on according to this for the L channel terminal or the right channel terminal
The main control module of a switch module break-make.
In addition, additionally providing a kind of audio frequency apparatus, include the voicefrequency circuit of above-mentioned elimination powered on moment noise.
The voicefrequency circuit of above-mentioned elimination powered on moment noise, by main control module to the L channel terminal of audio socket or
The voltage value that powers on of person's right channel terminal is detected, and the break-make that voltage value controls two switch modules can be powered on according to this, on
Electric moment can disconnect switch module, explosion noise caused by moment supply voltage acute variation be avoided, so as to influence sound quality
Effect realizes the purpose for eliminating audio frequency apparatus in powered on moment noise.Exist in addition, said program can not only eliminate audio frequency apparatus
Noise caused by powered on moment, improve acoustical quality, and take into account audio input, output it is optional, can by the voicefrequency circuit
It identifies audio input or output, an audio socket is shared so as to fulfill audio input, output.
Description of the drawings
Fig. 1 is the audio circuit module schematic diagram provided in an embodiment of the present invention for eliminating powered on moment noise；
Fig. 2 is the voicefrequency circuit schematic diagram of elimination powered on moment noise that one embodiment of the invention provides；
Fig. 3 is the voicefrequency circuit schematic diagram of elimination powered on moment noise that another embodiment of the present invention provides.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the audio circuit module schematic diagram of elimination powered on moment noise that present pre-ferred embodiments provide,
For convenience of description, part related to the present embodiment is illustrated only, details are as follows：
With reference to figure 1, a kind of voicefrequency circuit for eliminating powered on moment noise, including：Two switch modules (11,12), audios
Socket 20,30, two Audio Input Modules (41,42) of main control module, two audio output modules (51,52).
Wherein, audio socket 20 has L channel terminal (1,2), right channel terminal (3,4) and ground terminal 5；Two switches
Module (11,12) is connect respectively with the L channel terminal of audio socket 20 (1,2), right channel terminal (3,4), for controlling audio
Signal input and output；Two Audio Input Modules (41,42) are correspondingly connected with respectively with two switch modules (11,12), for defeated
Enter audio signal；Two audio output modules (51,52) are correspondingly connected with respectively with two switch modules (11,12), for exporting
Audio signal；Main control module 30 is connect with working power and two switch modules (11,12), also with L channel terminal (1,2) or
Right channel terminal (3,4) connection, detection L channel terminal (1,2) or right channel terminal (3,4) power on voltage signal and basis
This powers on voltage signal and controls two switch module (11,12) break-makes.
In one of the embodiments, with reference to figure 2, by taking a wherein switch module 11 as an example, which includes the
The output terminal of one switch chip Q1, first switch chip Q1 are connect, first switch with the L channel terminal of audio socket 20 (1,2)
The input terminal of chip Q1 connects with the wherein input terminal of an Audio Input Modules 41 and the output terminal of a wherein audio output module 51
It connects, the control terminal of first switch chip Q1 is connect with the driving end of main control module 30.Above description is to be arranged on L channel end
Illustrate related embodiment for switch module 11 in the L channel output input channel of son 1, and on the right side of right channel terminal 4
Another switch module 12 in sound channel output input channel is in addition to being the difference being connect with right channel terminal (3,4), circuit
Structure is identical with the switch module 10 in L channel output input channel.Specifically, another switch module 12 includes third
The output terminal of switch chip Q3, third switch chip Q3 are connect with the right channel terminal of audio socket 20 (3,4), third switch core
The input terminal of piece Q3 is connect with the input terminal of another Audio Input Modules 42 and the output terminal of another audio output module 52, the
The control terminal of three switch chip Q3 is connect with the driving end of main control module 30.
With reference to figure 2 or 3, main control module 30 include 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
The first of third capacitance C3, triode Q5 and main control chip (not shown), the first end of 3rd resistor R3 and the 5th resistance R5
End connect with the anode of working power, the second end of 3rd resistor R3, the collector of triode Q5 and third capacitance C3
First end connects the driving end as main control module 30 and is connect with switch module 10 altogether, emitter and the third capacitance of triode Q5
The second end of C3 is grounded altogether, and the base stage of triode Q5 is connect with the first end of the 4th resistance R4, the second end of the 4th resistance R4 with
The driving pin connection of main control chip, the second end of the 5th resistance R5 are connected to audio socket 20 altogether with the first end of the 6th resistance R6
L channel terminal 2 or right channel terminal (3,4), the detection pin of the second end of the 6th resistance R6 and main control chip connect.Work
It can be 5V to make power supply.
As above-mentioned, when audio socket accesses earphone, main control module 30 detects L channel terminal (1,2) or right channel end
The upper piezoelectric voltage of sub (3,4), and when this powers on voltage value as audio output voltage value, controlled by the switch of triode Q5
Make the first switch chip Q1 being connect with L channel terminal (1,2) and the third switch core being connect with right channel terminal (3,4)
The break-make of piece Q3.Due to audio socket, audio output to be made in powered on moment to send out explosion in the voltage acute variation of powered on moment miscellaneous
Sound, the present embodiment can control first switch chip Q1 and third switch chip Q3 Delayed conductings by main control module 30, wait to power on
After voltage stabilization, then first switch chip Q1 is driven to be connected, which can effectively eliminate the noise of powered on moment generation, carry
High tone quality effect.
In a further embodiment, with reference to figure 3, by taking a wherein switch module 11 as an example, which further includes
The output terminal of second switch chip Q2, first switch chip Q1 are connect with the output terminal of second switch chip Q2, second switch core
The input terminal of piece Q2 is connect with the L channel terminal (1,2) of audio socket 20, and the control terminal of second switch chip Q2 and first is opened
The control terminal for closing chip Q1 is connected to the driving end of main control module 30 altogether.Another switch module 12 further includes the 4th switch chip
The output terminal of Q4, the 4th switch chip Q4 are connect with the output terminal of third switch chip Q3, the input terminal of the 4th switch chip Q4
It is connect with the right channel terminal (3,4) of audio socket 20, the control terminal of the 4th switch chip Q4 and the control of third switch chip Q3
End processed is connected to the driving end of main control module 30 altogether.In the present embodiment, first switch chip Q1, second switch chip Q2, third
Switch chip Q3 and the 4th switch chip Q4 is connected up using symmetric design and difference cabling, not only eliminates differential mode string
It disturbs, and takes into account audio input, exports optional, a shared audio socket.
It should be noted that first switch chip Q1, second switch chip Q2, the switches of third switch chip Q3 and the 4th
Chip Q4 is N-type metal-oxide-semiconductor, first switch chip Q1, second switch chip Q2, third switch chip Q3 and the 4th switch core
The input, output end of piece Q4 and control terminal are respectively drain electrode, source electrode and the grid of metal-oxide-semiconductor.
With reference to figure 2 or 3, by taking a wherein Audio Input Modules 41 as an example, which includes first resistor R1
With the first capacitance C1, the first end of the first end of first resistor R1 and the first capacitance C1 are connect altogether as the defeated of Audio Input Modules 41
Enter end and connect with switch module 11 (being specifically the input terminal of first switch chip Q1), the second end of the first capacitance C1 is as sound
The output terminal of frequency input module 41, the second end ground connection of first resistor R1.Above description is to be arranged on the left sound of L channel terminal 1
Illustrate related embodiment for Audio Input Modules 41 in road output input channel, and in right channel output input channel
Another Audio Input Modules 42 in addition to being the difference being connect with switch module 12, circuit structure be with L channel export it is defeated
The Audio Input Modules 41 entered on channel are identical.Specifically, another Audio Input Modules 42 include the electricity of the tenth resistance R10 and the 6th
Hold C6, the first end of the tenth resistance R10 and the first end of the 6th capacitance C6 connect altogether as Audio Input Modules 42 input terminal simultaneously
It is connect with switch module 12 (being specifically the input terminal of third switch chip Q3), the second end of the 6th capacitance C6 is as audio input
The output terminal of module 42, the second end ground connection of the tenth resistance R10.
With reference to figure 2 or 3, by taking a wherein audio output module 51 as an example, which includes second resistance R2
With the second capacitance C2, the first end of second resistance R2 as audio output module 51 output terminal and with switch module 11 it is (specific
It is the input terminal of first switch chip Q1) it connects, the second end of second resistance R2 is connect with the first end of the second capacitance C2, and second
Input terminal of the second end of capacitance C2 as audio output module 51.Above description is to be arranged on the L channel of L channel terminal 1
Illustrate related embodiment for audio output module 51 in output input channel, and in right channel output input channel
For another audio output module 52 in addition to being the difference being connect with switch module 12, circuit structure is to export to input with L channel
Audio output module 51 on channel is identical.Specifically, another audio output module 52 includes the electricity of the 11st resistance R11 and the 7th
Hold C7, the first end of the 11st resistance R11 as audio output module 52 output terminal and with (the specifically third of switch module 12
The input terminal of switch chip Q3) it connects, the second end of the 11st resistance R11 is connect with the first end of the 7th capacitance C7, the 7th electricity
Hold input terminal of the second end of C7 as audio output module 52.
With reference to figure 2 or 3, the voicefrequency circuit for eliminating powered on moment noise further includes filter module 60, and filter module 60 connects
Between audio socket 20 and switch module (11,12), filter module 60 is filtered the audio-frequency information for inputting or exporting
Processing.Wherein, the filter module 60 includes the 4th capacitance C4, the 5th capacitance C5, the 8th resistance R8 and the 9th resistance R9, the
The first end of four resistance R4, first end, the first end of the 8th resistance R8 and the first end of the 9th resistance R9 of the 5th capacitance C5
Ground connection altogether, the second end of the 4th capacitance C4 and the second end of the 8th resistance R8 with the L channel terminal of audio socket 20 (1,2)
Connection, the second end of the 5th capacitance C5 and the second end of the 9th resistance R9 connect with the right channel terminal of audio socket 20 (3,4)
It connects.
It should be noted that with reference to figure 1 or 2 or 3, two switch modules (11,12), two Audio Input Modules (41,
42) and two audio output modules (51,52) are in symmetrical connection.
In addition, also providing a kind of audio frequency apparatus, which includes the voicefrequency circuit of above-mentioned elimination powered on moment noise.
Beneficial effects of the present invention：
(1) increase switch module (Q1, Q2, Q3, Q4) and main control module, main control module are treated by software control switch module
It powers on after voltage stabilization that driving switch module is connected again, effectively eliminates the noise of powered on moment.
(2) Q1, Q2, Q3 and Q4 are connected up using symmetric design and difference, eliminate differential mode crosstalk, and it is defeated to take into account audio
Enter, export optional, an audio socket can be shared.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of voicefrequency circuit for eliminating powered on moment noise, which is characterized in that the voicefrequency circuit includes：
Audio socket with L channel terminal, right channel terminal and ground terminal；
Two connect respectively with the L channel terminal of the audio socket, right channel terminal, for controlling audio signal input defeated
The switch module gone out；
Two are correspondingly connected with respectively with two switch modules, for the Audio Input Modules of input audio signal；
Two are correspondingly connected with respectively with two switch modules, for the audio output module of exports audio signal；
It connect with working power and two switch modules, is also connect with the L channel terminal or the right channel terminal,
Detect powering on voltage signal and voltage signal is powered on according to this and controlling two for the L channel terminal or the right channel terminal
The main control module of the switch module break-make.
2. the voicefrequency circuit of powered on moment noise is eliminated as described in claim 1, which is characterized in that wherein one switching molding
Block includes first switch chip, and the output terminal of the first switch chip is connect with the L channel terminal of the audio socket, institute
State the input terminal of first switch chip and the input terminal of wherein one Audio Input Modules and the wherein one audio output mould
The output terminal connection of block, the control terminal of the first switch chip and the driving end of main control module connect.
3. the voicefrequency circuit of powered on moment noise is eliminated as claimed in claim 2, which is characterized in that the switch module also wraps
Second switch chip is included, the output terminal of the first switch chip and the output terminal of the second switch chip connect altogether, and described
The input terminal of two switch chips is connect with the L channel terminal of the audio socket, the control terminal of the second switch chip and institute
The control terminal for stating first switch chip is connected to the driving end of the main control module altogether.
4. the voicefrequency circuit of powered on moment noise is eliminated as claimed in claim 3, which is characterized in that the first switch chip
It is N-type metal-oxide-semiconductor with the second switch chip, the input terminal of the first switch chip and the second switch chip, output
End and control terminal are respectively drain electrode, source electrode and the grid of metal-oxide-semiconductor.
5. the voicefrequency circuit as described in any one of claims 1 to 3 for eliminating powered on moment noise, which is characterized in that the sound
Frequency input module includes first resistor and the first capacitance, and the first end of the first end of the first resistor and first capacitance is total to
It connects the input terminal as the Audio Input Modules and is connect with the switch module, the second end of first capacitance is as institute
State the output terminal of Audio Input Modules, the second end ground connection of the first resistor.
6. the voicefrequency circuit as described in any one of claims 1 to 3 for eliminating powered on moment noise, which is characterized in that the sound
Frequency output module includes second resistance and the second capacitance, and the first end of the second resistance is as the defeated of the audio output module
Outlet is simultaneously connect with the switch module, and the second end of the second resistance is connect with the first end of second capacitance, described
Input terminal of the second end of second capacitance as the audio output module.
7. the voicefrequency circuit as described in any one of claims 1 to 3 for eliminating powered on moment noise, which is characterized in that the master
It controls module and includes 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, third capacitance, triode and main control chip, institute
It states the first end of 3rd resistor and the first end of the 5th resistance is connect with the anode of working power, the 3rd resistor
The first end of second end, the collector of the triode and the third capacitance connects the driving end as the main control module altogether
And connect with switch module, the emitter of the triode and the second end of the third capacitance are grounded altogether, the triode
Base stage is connect with the first end of the 4th resistance, and the second end of the 4th resistance is connect with the driving pin of the main control chip,
The second end of 5th resistance is connected to L channel terminal or the right side of the audio socket with the first end of the 6th resistance altogether
Sound channel terminal, the second end of the 6th resistance are connect with the detection pin of the main control chip.
8. the voicefrequency circuit of powered on moment noise is eliminated as described in claim 1, which is characterized in that two switching moldings
Block, two Audio Input Modules and two audio output modules are in symmetrical connection.
9. a kind of audio frequency apparatus, which is characterized in that eliminate powered on moment noise including claim 1 to 8 any one of them
Voicefrequency circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810184296.5A CN108200518B (en) | 2018-03-07 | 2018-03-07 | Audio circuit and audio equipment for eliminating instant noise during power-on |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810184296.5A CN108200518B (en) | 2018-03-07 | 2018-03-07 | Audio circuit and audio equipment for eliminating instant noise during power-on |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108200518A true CN108200518A (en) | 2018-06-22 |
| CN108200518B CN108200518B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810184296.5A Active CN108200518B (en) | 2018-03-07 | 2018-03-07 | Audio circuit and audio equipment for eliminating instant noise during power-on |
Country Status (1)
| Country | Link |
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| CN (1) | CN108200518B (en) |
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| CN112511953A (en) * | 2020-09-10 | 2021-03-16 | 美律电子(深圳)有限公司 | Playback apparatus and control method |
| CN113115180A (en) * | 2021-04-28 | 2021-07-13 | 广州朗国电子科技有限公司 | Plosive removing device of audio output end and audio equipment |
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| Publication number | Publication date |
|---|---|
| CN108200518B (en) | 2024-04-12 |
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