CN206743524U - Bluetooth module audio mute circuit - Google Patents
Bluetooth module audio mute circuit Download PDFInfo
- Publication number
- CN206743524U CN206743524U CN201720426989.1U CN201720426989U CN206743524U CN 206743524 U CN206743524 U CN 206743524U CN 201720426989 U CN201720426989 U CN 201720426989U CN 206743524 U CN206743524 U CN 206743524U
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- CN
- China
- Prior art keywords
- npn triode
- bluetooth
- module
- triode
- power amplifier
- Prior art date
- 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.)
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Abstract
It is applied to the decoded data signal of bluetooth changing into simulated audio signal the utility model discloses one kind, and effectively filters the bluetooth module audio mute circuit of various noises.It includes the filter circuit being sequentially connected electrically and mute circuit, filter circuit includes being sequentially connected in series the electric capacity I and resistance I at Bluetooth audio frequency module DACR ends and power amplifier module VOUTR ends and is sequentially connected in series electric capacity II and resistance II at Bluetooth audio frequency module DACL ends and power amplifier module VOUTL ends, mute circuit includes triode I and triode II, the base stage of triode I and triode II is electrically connected by current-limiting resistance with the I/O ends of Bluetooth audio frequency module, the emitter stage of triode I and triode II electrically connects with the AGND ends of power amplifier module, the colelctor electrode of triode I and triode II corresponds to the VOUTR ends and VOUTL ends of wired power amplifier module.The utility model can be widely applied to Bluetooth audio signals transmission field.
Description
Technical field
It the utility model is related to a kind of bluetooth module audio mute that can be widely applied to Bluetooth audio signals transmission field
Circuit.
Background technology
With the continuous progress of science and technology, the bluetooth on mobile phone（Bluetooth）Function has turned into instantly most popular wireless
Music mode.Audio is received by bluetooth module to listen music more and more convenient；Naturally, the sound equipment with Bluetooth function
Also it is more and more.However, bluetooth receiving module of the prior art is receiving digital and is decoding and be converted to analog signal output
During to power amplifier or loudspeaker, noise caused by Bluetooth chip digital-to-analogue conversion is also that obviously, why this is also
The most important reason that note matter cannot ensure is listened using Bluetooth function, particularly in bluetooth initial phase, or even has phase
When obvious poop.In addition, when being matched using the power amplifier module of some different parameters with bluetooth module, machine is above established by cable
During also easily produce more obvious rush of current sound, when power amplifier power is bigger, impulsive sound is also more obvious.
Utility model content
Technical problem to be solved in the utility model is overcome the deficiencies in the prior art, there is provided one kind is applied to bluetooth
Decoded data signal changes into simulated audio signal, and can effectively filter out the bluetooth module of various noise and rush of current sounds
Audio mute circuit.
Technical scheme is used by the utility model：The utility model is electrically connected to Bluetooth audio frequency module and power amplifier module
Between, the bluetooth module audio mute circuit includes the filter circuit and mute circuit being sequentially connected electrically, the filter circuit
Including be sequentially connected in series electric capacity I and resistance I at the Bluetooth audio frequency module DACR ends and the power amplifier module VOUTR ends and according to
The secondary electric capacity II and resistance II for being connected on the Bluetooth audio frequency module DACL ends and the power amplifier module VOUTL ends, it is described Jing Yin
Circuit includes NPN triode I and NPN triode II, and the base stage of the NPN triode I and the NPN triode II passes through limit
Leakage resistance electrically connects with the I/O ends of the Bluetooth audio frequency module, the emitter stage of the NPN triode I and the NPN triode II
Electrically connected with the AGND ends of the power amplifier module, the colelctor electrode of the NPN triode I and the NPN triode II correspondingly connects
Connect the VOUTR ends and VOUTL ends of the power amplifier module.
Further, the bluetooth module audio mute circuit also includes reserving dividing voltage regulator circuit, the reserved partial pressure
Regulation circuit includes the reserved resistance I in parallel with the NPN triode I and the reserved resistance in parallel with the NPN triode II
Ⅱ。
Further, the mute circuit also includes ground capacity, the ground capacity respectively with the NPN triode I
Electrically connected with the emitter stage of the NPN triode II.
Further, the electric capacity I and electric capacity II are 105 patch capacitors, and the NPN triode I and NPN triode II are
9014 triodes, the ground capacity are 10uf electric capacity.
The beneficial effects of the utility model are：Because the utility model is to belong to set up in Bluetooth audio frequency module and power amplifier mould
A kind of tonequality optimization circuit between block, its filter circuit, mute circuit and reserved partial pressure for mainly including being sequentially connected electrically are adjusted
Economize on electricity road, filter circuit can tentatively filter out clutter, make the reduction of output voltage ripple coefficient, waveform is become more smooth；It is quiet
Sound circuit is using NPN triode as analog switch pipe, when I/O ends are high level, analog switch pipe（NPN triode）It is full
Ground is bypassed to, audio signal, it is Jing Yin so as to realize；It is reserved to divide voltage regulator circuit further to regulate and control shunting voltage, it can match somebody with somebody
Close mute circuit and realize more preferable muting function, so, the utility model can effectively filter out various noises and initial current
Impulsive sound, music tonequality is improved, meet that the audio of music-lover's high standard plays experience.In addition, for different ginsengs
When several power amplifier modules is matched with bluetooth module, the mute circuit can also play more obvious effect, and this just breaks
The limitation that special parameter power amplifier module matches with bluetooth module, so as to effectively reduce production cost, improve final products
Cost performance.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in figure 1, in the present embodiment, the utility model is electrically connected between Bluetooth audio frequency module and power amplifier module,
The bluetooth module audio mute circuit includes the filter circuit 1 and mute circuit 2 being sequentially connected electrically, and the filter circuit 1 wraps
Include be sequentially connected in series electric capacity I11 and resistance I12 at the Bluetooth audio frequency module DACR ends and the power amplifier module VOUTR ends and
It is sequentially connected in series the electric capacity II 13 and resistance II 14 at the Bluetooth audio frequency module DACL ends and the power amplifier module VOUTL ends, institute
It is 105 patch capacitors to state electric capacity I11 and electric capacity II 13, and filter circuit 1 can tentatively filter out clutter, make output voltage ripple coefficient
Reduce, waveform is become more smooth, the mute circuit 2 includes NPN triode I21 and NPN triode II 22, the NPN
Triode I21 and the base that NPN triode II 22 is 9014 triodes, the NPN triode I21 and the NPN triode II 22
Extremely electrically connected by current-limiting resistance 23 with the I/O ends of the Bluetooth audio frequency module, the NPN triode I21 and the NPN tri-
The emitter stage of pole pipe II 22 electrically connects with the AGND ends of the power amplifier module, NPN triode I21 and the NPN tri- pole
The colelctor electrode of pipe II 22 correspondingly connects the VOUTR ends and VOUTL ends of the power amplifier module；The mute circuit 2 is using the poles of NPN tri-
Pipe is as analog switch pipe, when I/O ends are high level, analog switch pipe（NPN triode）Saturation, audio signal are bypassed to
Ground, it is Jing Yin so as to realize；The utility model also include it is reserved divide voltage regulator circuit 3, it is described it is reserved divide voltage regulator circuit 3 include with
The NPN triode I21 reserved resistance I31 in parallel and the reserved resistance II 32 in parallel with the NPN triode II 22, it is described
It is reserved to divide voltage regulator circuit 3 further to regulate and control shunting voltage, mute circuit can be coordinated to realize more preferable muting function；It is described quiet
Sound circuit 2 also includes ground capacity 24, the ground capacity 24 respectively with the NPN triode I21 and the NPN triode II
22 emitter stage electrical connection；The ground capacity 24 is 10uf electric capacity.
The utility model can be widely applied to Bluetooth audio signals transmission field.
Although embodiment of the present utility model is described with practical solution, do not form the utility model is contained
The limitation of justice, for those skilled in the art, according to modification of this specification to its embodiment and the group with other schemes
Conjunction will be apparent from.
Claims (4)
1. a kind of bluetooth module audio mute circuit, is electrically connected between Bluetooth audio frequency module and power amplifier module, it is characterised in that：
The bluetooth module audio mute circuit includes the filter circuit being sequentially connected electrically（1）And mute circuit（2）, the filter circuit
（1）Including being sequentially connected in series the electric capacity I at the Bluetooth audio frequency module DACR ends and the power amplifier module VORTR ends（11）And resistance
I（12）And it is sequentially connected in series the electric capacity II at the Bluetooth audio frequency module DACL ends and the power amplifier module VORTL ends（13）With
Resistance II（14）, the mute circuit（2）Including NPN triode I（21）And NPN triode II（22）, the NPN triode I
（21）With the NPN triode II（22）Base stage pass through current-limiting resistance（23）With the I/O ends electricity of the Bluetooth audio frequency module
Connection, the NPN triode I（21）With the NPN triode II（22）AGND end of the emitter stage with the power amplifier module
Electrical connection, the NPN triode I（21）With the NPN triode II（22）Colelctor electrode correspondingly connect the power amplifier module
VORTR ends and VORTL ends.
2. bluetooth module audio mute circuit according to claim 1, it is characterised in that：The bluetooth module audio mute
Circuit also includes reserving dividing voltage regulator circuit（3）, it is described reserved to divide voltage regulator circuit（3）Including with the NPN triode I（21）
Reserved resistance I in parallel（31）And with the NPN triode II（22）Reserved resistance II in parallel（32）.
3. bluetooth module audio mute circuit according to claim 1, it is characterised in that：The mute circuit（2）Also wrap
Include ground capacity（24）, the ground capacity（24）Respectively with the NPN triode I（21）With the NPN triode II（22）
Emitter stage electrical connection.
4. bluetooth module audio mute circuit according to claim 3, it is characterised in that：The electric capacity I（11）And electric capacity
Ⅱ（13）For 105 patch capacitors, the NPN triode I（21）With NPN triode II（22）For 9014 triodes, the ground connection
Electric capacity（24）For 10uf electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720426989.1U CN206743524U (en) | 2017-04-21 | 2017-04-21 | Bluetooth module audio mute circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720426989.1U CN206743524U (en) | 2017-04-21 | 2017-04-21 | Bluetooth module audio mute circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206743524U true CN206743524U (en) | 2017-12-12 |
Family
ID=60560639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720426989.1U Active CN206743524U (en) | 2017-04-21 | 2017-04-21 | Bluetooth module audio mute circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206743524U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107889016A (en) * | 2017-12-22 | 2018-04-06 | 宁波向往智能科技有限公司 | A kind of double Bluetooth audio frequency circuits and its audio amplifier |
-
2017
- 2017-04-21 CN CN201720426989.1U patent/CN206743524U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107889016A (en) * | 2017-12-22 | 2018-04-06 | 宁波向往智能科技有限公司 | A kind of double Bluetooth audio frequency circuits and its audio amplifier |
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