CN107181997A - A kind of audio de-noising circuit and with wheat audio amplifier - Google Patents
A kind of audio de-noising circuit and with wheat audio amplifier Download PDFInfo
- Publication number
- CN107181997A CN107181997A CN201710480074.3A CN201710480074A CN107181997A CN 107181997 A CN107181997 A CN 107181997A CN 201710480074 A CN201710480074 A CN 201710480074A CN 107181997 A CN107181997 A CN 107181997A
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- audio
- module
- input
- electric capacity
- circuit
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
-
- 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
- H04R2410/00—Microphones
- H04R2410/05—Noise reduction with a separate noise microphone
Abstract
The invention belongs to audio frequency control technical field there is provided a kind of audio de-noising circuit and with wheat audio amplifier.Audio de-noising circuit connection audio input circuit and audio output circuit provided by the present invention, including power supply module, power amplifier module, timing_delay estimation module and path control module；The input of power amplifier module connects the output end of audio input circuit, and the output end of power supply module connects the input of timing_delay estimation module, the input of the output end wired power amplifier module of timing_delay estimation module；The output end and the input of audio output circuit of input and output end the difference wired power amplifier module of path control module, the control end of path control module connect the output end of timing_delay estimation module.Due to timing_delay estimation module circuit work after Delayed conducting, postpone to provide predetermined reference voltage and the conducting of path control module to audio input circuit, so that noise produced during power amplifier module work can not be by path control module, and then noise is eliminated, lift the usage experience of user.
Description
Technical field
The invention belongs to audio frequency control technical field, more particularly to a kind of audio de-noising circuit and with wheat audio amplifier.
Background technology
Audio amplifier is generally used for family's playback, is characterized in that playback matter exquisiteness is soft, external form is more exquisite, attractive in appearance, playback sound
Arbitrarily downgrade less high, the power born is relatively fewer.Professional sound box is generally used for dancing hall, Karaoke, cinema, hall and physical culture
The specialty entertainment such as venue place.The sensitivity of general Professional sound box is higher, and playback acoustic pressure is high, and dynamics is good, power is born greatly, with family
Compared with audio amplifier, its tonequality is partially hard, external form is also not very exquisite.Monitor speaker in Professional sound box, its performance and domestic loudspeaker box compared with
It is close, external form is typically also exquisiter, compact, so this kind of monitor speaker is also often used by family expenses HI-FI sound systems.
Current band wheat audio amplifier has current sound or interference noise in playing audio signal or collection audio signal,
Bad usage experience is brought to user.
The content of the invention
It is an object of the invention to provide a kind of audio de-noising circuit, it is intended to solves existing band wheat audio amplifier and there is noise
Problem.
To solve the above problems, the technical solution used in the present invention is as follows：
A kind of audio de-noising circuit, connection audio input circuit and audio output circuit, including power supply module and power amplifier mould
Block, the input of the power amplifier module connects the output end of the audio input circuit, it is characterised in that：The audio de-noising electricity
Road also includes timing_delay estimation module and path control module；
The output end of the power supply module connects the input of the timing_delay estimation module, the timing_delay estimation module it is defeated
Go out the input of the end connection power amplifier module；
The input, output end of the path control module and control end connect the output of the power amplifier module respectively
The output end at end, the input of the audio output circuit and the timing_delay estimation module.
As the improvement of above-mentioned technical proposal, the audio de-noising circuit also include be serially connected with the audio input circuit with
Audio frequency filtration module between the power amplifier module；The input and output end of the audio frequency filtration module connect the sound respectively
The input of the output end of frequency input circuit and the power amplifier module.
As the improvement of above-mentioned technical proposal, the audio de-noising circuit also include be serially connected with the timing_delay estimation module with
Current filtering module between the power amplifier module；When the input and input of the current filtering module connect described respectively
Prolong the output end of control module and the input of the power amplifier module.
As the improvement of above-mentioned technical proposal, the timing_delay estimation module includes first resistor, second resistance, the 3rd electricity
Resistance, the first electric capacity, PNP triode and NPN triode；The colelctor electrode of the PNP triode is the timing_delay estimation module
The first end of output end, the emitter stage of the PNP triode and the 3rd resistor connects to form the timing_delay estimation module altogether
The first end of input, the second end of the 3rd resistor and first electric capacity is connected to the first end of the second resistance altogether,
Second end of the second resistance connects the base stage of the NPN triode, the colelctor electrode connection described first of the NPN triode
The first end of resistance, the second end of the first resistor connects the base stage of the PNP triode, the second end of first electric capacity
It is connected to ground altogether with the emitter stage of the NPN triode.
As the improvement of above-mentioned technical proposal, the audio frequency filtration module includes the second electric capacity, the 3rd electric capacity, the 4th electricity
Appearance, the 5th electric capacity and inductance；The of the first end of second electric capacity, the first end of the 3rd electric capacity and the inductance
One end connects the input to form the audio frequency filtration module, the first end of the 4th electric capacity, the first of the 5th electric capacity altogether
End and the second end of the inductance connect the output end to form the audio frequency filtration module altogether, the second end of second electric capacity,
The second end, the second end of the 4th electric capacity and the second end of the 5th electric capacity of 3rd electric capacity are connected to ground altogether.
As the improvement of above-mentioned technical proposal, the current filtering module includes the 4th resistance, the 6th electric capacity and the 7th
Electric capacity；The first end of 4th resistance is the input of the current filtering module, the second end of the 4th resistance, described
The first end of 6th electric capacity and the first end of the 7th electric capacity connect the output end to form the current filtering module altogether, described
Second end of the 6th electric capacity and the second end of the 7th electric capacity are connected to ground altogether.
As the improvement of above-mentioned technical proposal, the path control module is set to NMOS tube；The drain electrode of the NMOS tube,
Source electrode and grid are input, output end and the control end of the path control module respectively.
A kind of band wheat audio amplifier, including audio input circuit and audio output circuit, it is characterised in that：The band wheat audio amplifier is also
Including the audio de-noising circuit according to any one of claim 1 to 9.
Compared with prior art, implementation result of the invention is as follows by the present invention：
It is an object of the invention to provide a kind of audio de-noising circuit, it is intended to solves existing band wheat audio amplifier and there is noise
Problem.Due to timing_delay estimation module circuit work after Delayed conducting, postpone give audio input circuit provide predetermined reference voltage
With the conducting of path control module so that when power amplifier module works produced noise can not by path control module, and then
Noise is eliminated, the usage experience of user is lifted.
Brief description of the drawings
Fig. 1 is the function structure chart for the audio de-noising circuit that first embodiment of the invention is provided；
Fig. 2 is the function structure chart for the audio de-noising circuit that second embodiment of the invention is provided；
Fig. 3 is the exemplary circuit structure chart for the audio de-noising circuit that second embodiment of the invention is provided；
Fig. 4 is the exemplary circuit structure chart of the noise reduction chip for the audio de-noising circuit that third embodiment of the invention is provided.
Embodiment
Illustrate present disclosure below in conjunction with specific embodiments.
Embodiment 1：
Fig. 1 shows the modular structure for the audio de-noising circuit that the present embodiment is provided, and for convenience of description, illustrate only
Part related to the present embodiment, details are as follows：
Audio de-noising circuit connection audio input circuit 10 and audio output circuit 20 that the present embodiment is provided.
Further, audio de-noising circuit can also include power supply module 30 and power amplifier module 40, power amplifier module 40 it is defeated
Enter the output end of end connection audio input circuit 10.
In the present embodiment, power supply module 30 can power for other circuit modules, and power amplifier module 40 is by multiple computings
The amplifying circuit that amplifier is constituted.
Further, audio de-noising circuit also includes timing_delay estimation module 50 and path control module 60.
Specifically, the input of the output end connection timing_delay estimation module 50 of power supply module 30, timing_delay estimation module 50
The input of output end wired power amplifier module 40.The input, output end of path control module 60 and control end are connected respectively
The output end of the output end of power amplifier module 40, the input of audio output circuit 20 and timing_delay estimation module 50.
In the present embodiment, due to timing_delay estimation module 50 circuit work after Delayed conducting, postpone electricity to audio input
Road 10 provides the conducting of predetermined reference voltage and path control module 60 so that the noise produced when working of power amplifier module 40 without
Method is by path control module 60, so as to eliminate noise in noise source.
Embodiment 2：
The implementation of the present embodiment is set up on the basis of a upper embodiment.
Fig. 2 shows the modular structure for the audio de-noising circuit that the present embodiment is provided, and for convenience of description, illustrate only
Part related to the present embodiment, details are as follows：
In the present embodiment, audio de-noising circuit also includes being serially connected between audio input circuit 10 and power amplifier module 40
Audio frequency filtration module 70, and the current filtering module 80 being serially connected between timing_delay estimation module 50 and power amplifier module 40；
Specifically, the input and output end of audio frequency filtration module 70 connect respectively audio input circuit 10 output end and
The input of power amplifier module 40.The input and input of current filtering module 80 connect the output of timing_delay estimation module 50 respectively
End and the input of power amplifier module 40.
In the present embodiment, the ambient noise signal exported by audio frequency filtration module 70 to audio input circuit 10 is done
Filtering process, to suppress current spike.The current spike that power supply module 30 is exported is filtered out by current filtering module 80.
Further, as shown in figure 3, timing_delay estimation module 50 can include：
First resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1, PNP triode Q1 and NPN triode
Q2；
PNP triode Q1 colelctor electrode is the output end of timing_delay estimation module 50, PNP triode Q1 emitter stage and the 3rd
Resistance R3 first end connects the input to form timing_delay estimation module 50 altogether, 3rd resistor R3 the second end and the first electric capacity C1's
First end is connected to second resistance R2 first end, second resistance R2 the second end connection NPN triode Q2 base stage, NPN tri- altogether
Pole pipe Q2 colelctor electrode connection first resistor R1 first end, first resistor R1 the second end connection PNP triode Q1 base stage,
First electric capacity C1 the second end and NPN triode Q2 emitter stage are connected to ground altogether.
In the present embodiment, the electric current that power supply module 30 is exported is the first electric capacity C1 chargings after 3rd resistor R3.
Due to 3rd resistor R3 metering function, the first electric capacity C1 charging interval is long, as long as setting 3rd resistor R3 resistance
With the first electric capacity C1 capacitance, it is possible to change the first electric capacity C1 charging interval.In the first electric capacity C1 charging process, the
Voltage in one electric capacity C1 first end slowly increases, and NPN triode Q2 base voltage also slowly increases, until meeting NPN
Triode Q2 on state threshold voltage, NPN triode Q2 conductings.Low level signal is exported after NPN triode Q2 conductings to PNP tri-
Pole pipe Q1, is turned it on.So as to which the electric current that power supply module 30 is exported can be audio input by current filtering module 80
Circuit 10 provides predetermined reference voltage and control access control module 60 is turned on.
Further, as shown in figure 3, audio frequency filtration module 70 can include：
Second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and inductance L1；
Second electric capacity C2 first end, the 3rd electric capacity C3 first end and inductance L1 first end connects to form audio filter altogether
The input of ripple module 70, the 4th electric capacity C4 first end, the 5th electric capacity C5 first end and inductance L1 the second end connect altogether
Form the output end of audio frequency filtration module 70, the second electric capacity C2 the second end, the 3rd electric capacity C3 the second end, the 4th electric capacity C4
Second end and the 5th electric capacity C5 the second end are connected to ground altogether.
Further, as shown in figure 3, current filtering module 80 can include：
4th resistance R4, the 6th electric capacity C6 and the 7th electric capacity C7；
4th resistance R4 first end is the input of current filtering module 80, the 4th resistance R4 the second end, the 6th electricity
Hold C6 first end and the 7th electric capacity C7 first end connects the output end to form current filtering module 80 altogether, the 6th electric capacity C6's
Second end and the 7th electric capacity C7 the second end are connected to ground altogether.
Further, as shown in figure 3, path control module 60 can be NMOS tube Q3；
NMOS tube Q3 drain electrode, source electrode and grid is input, output end and the control of path control module 60 respectively
End processed.
Embodiment 3：
The implementation of the present embodiment is set up on the basis of any of the above-described embodiment.
In the present embodiment, as shown in figure 4, power amplifier module 40 and power supply module 30 are integrated in a noise reduction chip U1.
Specifically, noise reduction chip U1 power output end MICS is the output end of power supply module 30, noise reduction chip U1 letter
Number input MICL and signal output part QMICL is the input and output end of power amplifier module 40 respectively.
Further, as shown in figure 4, audio de-noising circuit can also include the 8th electric capacity C8 and the 9th electric capacity C9；
8th electric capacity C8 first end connection noise reduction chip U1 power output end MICS, the 8th electric capacity C8 the second termination
Ground, the 9th electric capacity C9 is serially connected with before noise reduction chip U1 signal input part MICL.
Another object of the present invention also resides in a kind of band wheat audio amplifier of offer, including audio input circuit 10 and audio output electricity
Road 20, in addition to the audio de-noising circuit provided such as above-mentioned any embodiment.
Audio de-noising circuit connection audio input circuit and audio output circuit provided by the present invention, including power supply mould
Block, power amplifier module, timing_delay estimation module and path control module；Wherein, the input connection audio input circuit of power amplifier module
Output end, the output end of power supply module connects the input of timing_delay estimation module, the output end connection work(of timing_delay estimation module
The input of amplification module；The input and output end of path control module distinguish the output end and audio output of wired power amplifier module
The input of circuit, the control end of path control module connects the output end of timing_delay estimation module.Because timing_delay estimation module exists
Delayed conducting after circuit work, postpones to provide predetermined reference voltage and the conducting of path control module to audio input circuit, makes
Obtaining noise produced during power amplifier module work can not be by path control module, and then eliminates noise, lifts the use of user
Experience.
Above content is made for the present invention in conjunction with specific embodiments describes in detail, it is impossible to assert that the present invention is specific real
Apply and be only limitted to these explanations.For those skilled in the art, before present inventive concept is not departed from
Put, some simple deduction or replace can also be made, the scope of protection of the invention should be all considered as belonging to.
Claims (8)
1. a kind of audio de-noising circuit, connection audio input circuit and audio output circuit, including power supply module and power amplifier module,
The input of the power amplifier module connects the output end of the audio input circuit, it is characterised in that：The audio de-noising circuit
Also include timing_delay estimation module and path control module；
The output end of the power supply module connects the input of the timing_delay estimation module, the output end of the timing_delay estimation module
Connect the input of the power amplifier module；
The input, output end of the path control module and control end connect the output end of the power amplifier module, institute respectively
State the input of audio output circuit and the output end of the timing_delay estimation module.
2. audio de-noising circuit according to claim 1, it is characterised in that：The audio de-noising circuit also includes being serially connected with
Audio frequency filtration module between the audio input circuit and the power amplifier module；The input of the audio frequency filtration module and defeated
Go out end and connect the output end of the audio input circuit and the input of the power amplifier module respectively.
3. audio de-noising circuit according to claim 1, it is characterised in that：The audio de-noising circuit also includes being serially connected with
Current filtering module between the timing_delay estimation module and the power amplifier module；The input of the current filtering module and defeated
Enter end and connect the output end of the timing_delay estimation module and the input of the power amplifier module respectively.
4. audio de-noising circuit according to claim 1, it is characterised in that：The timing_delay estimation module includes the first electricity
Resistance, second resistance, 3rd resistor, the first electric capacity, PNP triode and NPN triode；The colelctor electrode of the PNP triode is
The first end of the output end of the timing_delay estimation module, the emitter stage of the PNP triode and the 3rd resistor connects to be formed altogether
The first end of the input of the timing_delay estimation module, the second end of the 3rd resistor and first electric capacity is connected to described altogether
The first end of second resistance, the second end of the second resistance connects the base stage of the NPN triode, the NPN triode
Colelctor electrode connects the first end of the first resistor, and the second end of the first resistor connects the base stage of the PNP triode, institute
State the second end of the first electric capacity and the emitter stage of the NPN triode is connected to ground altogether.
5. audio de-noising circuit according to claim 2, it is characterised in that：The audio frequency filtration module includes the second electricity
Appearance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and inductance；The first of the first end of second electric capacity, the 3rd electric capacity
The first end of end and the inductance connects the input to form the audio frequency filtration module altogether, the first end of the 4th electric capacity,
The first end of 5th electric capacity and the second end of the inductance connect the output end to form the audio frequency filtration module altogether, described
Second end of the second electric capacity, the second end of the 3rd electric capacity, the second end of the 4th electric capacity and the 5th electric capacity
Second end is connected to ground altogether.
6. audio de-noising circuit according to claim 3, it is characterised in that：The current filtering module includes the 4th electricity
Resistance, the 6th electric capacity and the 7th electric capacity；The first end of 4th resistance is the input of the current filtering module, described
The first end at the second end of four resistance, the first end of the 6th electric capacity and the 7th electric capacity connects to form the electric current filter altogether
The output end of ripple module, the second end of the 6th electric capacity and the second end of the 7th electric capacity are connected to ground altogether.
7. audio de-noising circuit according to claim 1, it is characterised in that：The path control module is set to NMOS
Pipe；Drain electrode, source electrode and the grid of the NMOS tube are input, output end and the control of the path control module respectively
End.
8. a kind of band wheat audio amplifier, including audio input circuit and audio output circuit, it is characterised in that：The band wheat audio amplifier is also wrapped
Include the audio de-noising circuit according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710480074.3A CN107181997A (en) | 2017-06-21 | 2017-06-21 | A kind of audio de-noising circuit and with wheat audio amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710480074.3A CN107181997A (en) | 2017-06-21 | 2017-06-21 | A kind of audio de-noising circuit and with wheat audio amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107181997A true CN107181997A (en) | 2017-09-19 |
Family
ID=59844432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710480074.3A Pending CN107181997A (en) | 2017-06-21 | 2017-06-21 | A kind of audio de-noising circuit and with wheat audio amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107181997A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862467A (en) * | 2017-11-30 | 2019-06-07 | 深圳市冠旭电子股份有限公司 | A kind of power amplifier and sound equipment applied to sound equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07249976A (en) * | 1994-03-10 | 1995-09-26 | Fujitsu Ltd | Noise reducing circuit by simultaneous change output |
| CN203933898U (en) * | 2014-04-14 | 2014-11-05 | 深圳市冠旭电子有限公司 | A kind of VGA CARD is eliminated circuit and active noise reduction earphone |
| CN204009463U (en) * | 2014-08-12 | 2014-12-10 | 北京华录天维科技有限公司 | A kind of power on and power off muffling circuit |
| CN205232439U (en) * | 2015-11-18 | 2016-05-11 | 深圳市冠旭电子有限公司 | Denoising circuit and audio amplifier |
-
2017
- 2017-06-21 CN CN201710480074.3A patent/CN107181997A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07249976A (en) * | 1994-03-10 | 1995-09-26 | Fujitsu Ltd | Noise reducing circuit by simultaneous change output |
| CN203933898U (en) * | 2014-04-14 | 2014-11-05 | 深圳市冠旭电子有限公司 | A kind of VGA CARD is eliminated circuit and active noise reduction earphone |
| CN204009463U (en) * | 2014-08-12 | 2014-12-10 | 北京华录天维科技有限公司 | A kind of power on and power off muffling circuit |
| CN205232439U (en) * | 2015-11-18 | 2016-05-11 | 深圳市冠旭电子有限公司 | Denoising circuit and audio amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862467A (en) * | 2017-11-30 | 2019-06-07 | 深圳市冠旭电子股份有限公司 | A kind of power amplifier and sound equipment applied to sound equipment |
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Application publication date: 20170919 |
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