CN205232439U - Denoising circuit and audio amplifier - Google Patents
Denoising circuit and audio amplifier Download PDFInfo
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- CN205232439U CN205232439U CN201520926825.6U CN201520926825U CN205232439U CN 205232439 U CN205232439 U CN 205232439U CN 201520926825 U CN201520926825 U CN 201520926825U CN 205232439 U CN205232439 U CN 205232439U
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Abstract
The utility model belongs to audio frequency design field especially relates to the denoising circuit and audio amplifier that can eliminate audio amplifier puff noise. This denoising circuit is connected between the audio output device and power amplifier in the audio amplifier, including unidirectional flux module, time delay module and the switch module that meets in proper order. As preferred, still can be provided with a current -limiting module between the control end of the output of unidirectional flux module and time delay module. According to the embodiment of the utility model provides an audio amplifier and denoising circuit in of the signal output of the audio output of audio amplifier device, utilize the time delay effect of switching on of time delay module, have eliminated the puff noise of audio amplifier as far as possible, can improve the life and the quality of audio amplifier on the one hand, and on the other hand also can improve user's sense organ comfort level.
Description
Technical field
The utility model belongs to Audio Design field, particularly relates to a kind of noise canceller circuit and the audio amplifier of eliminating audio amplifier puff puff noise.
Background technology
Puff puff noise refer to audio parts powering on, shutdown transient and power on stable after, the explosion sound that the transient impact that various operation brings produces.Audio system comprises the parts such as source of sound, power amplifier, loudspeaker usually, if wherein there is a ring layout improper, all can produce puff puff noise.Especially audio amplifier, if in addition unsuitable protection, the impact of this puff puff noise can reduce the quality of audio amplifier, even likely burns audio amplifier, shortens its useful life.Transient impact in acoustic source system, after audio amplifier, also can produce the ear-drum of the sound film of speaker, people and impact, affect sense organ comfort level.
Utility model content
Namely the purpose of this utility model is to provide a kind of noise canceller circuit and audio amplifier, and the puff puff noise being intended to solve existing audio parts can reduce audio amplifier quality, even shorten its useful life, and affects the technical problem of user's sense organ comfort level.
On the one hand, the noise canceller circuit that the utility model embodiment provides, is connected between audio output device in audio amplifier and power amplifier, comprises the one-way conduction module, time delay module and the switch module that connect successively; The signal output part of audio output device described in the input termination of described one-way conduction module; The control end of time delay module described in the output termination of described one-way conduction module, the control end of switch module described in the output termination of described time delay module, the power supply termination operating voltage output of described switch module, the input of power amplifier described in the output termination of described switch module.
Further, a current limliting module is also provided with between the output of described one-way conduction module and the control end of described time delay module.
Particularly, described one-way conduction module comprises diode D1; The anode of described diode D1 connects the signal output part of described audio output device, and the negative electrode of described diode D1 connects the input of described current limliting module.
Particularly, described current limliting module comprises a current-limiting resistance R4; Between the output that described current-limiting resistance R4 is connected to described one-way conduction module and the control end of described time delay module.
Particularly, described time delay module comprises triode Q1 and resistance R1; The output of current limliting module described in the control termination of described triode Q1, the control end of switch module described in the high potential termination of described triode Q1, the cold end ground connection of described triode Q1, between the control end that described resistance R1 is connected to described triode Q1 and cold end.
More specifically, described triode Q1 is NPN type triode; The base stage of described NPN type triode, collector and emitter are respectively the control end of described triode Q1, hot end and cold end; Or described triode Q1 is PNP type triode; The base stage of described PNP type triode, emitter and collector are respectively the control end of described triode Q1, hot end and cold end.
Further, described switch module comprises metal-oxide-semiconductor Q2 and resistance R2, resistance R3; The control end of described metal-oxide-semiconductor Q2 connects the hot end of described triode Q1 by described resistance R2, the high potential termination operating voltage output of described metal-oxide-semiconductor Q2, the cold end of described metal-oxide-semiconductor Q2 is the output of described switch module, the input connecing described power amplifier; Between the control end that described resistance R3 is connected to described metal-oxide-semiconductor Q2 and hot end.
On the other hand, the utility model embodiment also provides a kind of audio amplifier, and as improvement, described audio amplifier comprises the noise canceller circuit under arbitrary form as above.
The audio amplifier provided according to the utility model embodiment and noise canceller circuit thereof, when the signal of the audio output device of audio amplifier exports, utilize the Delayed conducting effect of time delay module, eliminate the puff puff noise of audio amplifier as much as possible, useful life and the quality of audio amplifier can be improved on the one hand, also can improve the sense organ comfort level of user on the other hand.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the noise canceller circuit that the utility model preferred embodiment provides;
Fig. 2 is the structural representation of the noise canceller circuit that the utility model preferred embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 is the structured flowchart of the noise canceller circuit that the utility model preferred embodiment provides; For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:
A kind of noise canceller circuit, is connected between audio output device 100 in audio amplifier and power amplifier 200, comprises one-way conduction module 10, time delay module 20 and switch module 30.Particularly, the signal output part of the input termination audio output device 100 of one-way conduction module 10; The control end of the output termination time delay module 20 of one-way conduction module 10, the control end of the output termination switch module 30 of time delay module 20, the power supply termination operating voltage output VCC of switch module 30, the input of the output termination power amplifier 200 of switch module 30.
See Fig. 1, as a preferred embodiment, between the output of one-way conduction module 10 and the control end of time delay module 20, a current limliting module 40 also can be provided with.
According to the noise canceller circuit that the utility model embodiment provides, when the signal of audio output device exports, utilize the Delayed conducting effect of time delay module, eliminate the puff puff noise of audio amplifier as much as possible.
Fig. 2 is the structural representation of the noise canceller circuit that the utility model preferred embodiment provides.Same, for convenience of explanation, again illustrate only part related to the present embodiment, as shown in the figure:
As a preferred embodiment, one-way conduction module 10 comprises diode D1.The anode of diode D1 connects the signal output part of audio output device 100, and the negative electrode of diode D1 connects the input of current limliting module 40.
As a preferred embodiment, current limliting module 40 comprises a current-limiting resistance R4; Current-limiting resistance R4 is connected between the output of one-way conduction module 10 and the control end of time delay module 20.
As a preferred embodiment, time delay module 20 comprises triode Q1 and resistance R1; The output of the control termination current limliting module 40 of triode Q1, the control end of the high potential termination switch module 30 of triode Q1, the cold end ground connection of triode Q1, between the control end that resistance R1 is connected to triode Q1 and cold end.
In illustrated the present embodiment, what triode Q1 selected is NPN type triode.The base stage of this NPN type triode, collector and emitter correspond to the control end of described triode Q1, hot end and cold end respectively.In fact, in specific implementation process, triode Q1 also can select PNP type triode; The base stage of PNP type triode, emitter and collector correspond to the control end of described triode Q1, hot end and cold end respectively.
As a preferred embodiment, switch module 30 comprises metal-oxide-semiconductor Q2 and resistance R2, resistance R3; The control end of metal-oxide-semiconductor Q2 connects the hot end of triode Q1 by resistance R2, the high potential termination operating voltage output VCC of metal-oxide-semiconductor Q2, and the cold end of metal-oxide-semiconductor Q2 is the output of switch module 30, the input connecing power amplifier 200; Between the control end that resistance R3 is connected to metal-oxide-semiconductor Q2 and hot end.
On the other hand, the utility model embodiment also provides a kind of audio amplifier, and as improvement, described audio amplifier comprises the noise canceller circuit under arbitrary form as above.Because the structure of built-in noise canceller circuit is identical, just repeat no more at this.
In sum, the audio amplifier provided according to the utility model embodiment and noise canceller circuit thereof, when the signal of the audio output device of audio amplifier exports, utilize the Delayed conducting effect of time delay module, eliminate the puff puff noise of audio amplifier as much as possible, useful life and the quality of audio amplifier can be improved on the one hand, also can improve the sense organ comfort level of user on the other hand.
It should be noted that in above-described embodiment, included unit is carry out dividing according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit, also just for the ease of mutual differentiation, is not limited to protection range of the present utility model.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, although carried out comparatively detailed description with reference to previous embodiment to the utility model, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments or carry out equivalent replacement to wherein portion of techniques feature.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a noise canceller circuit, be connected between audio output device in audio amplifier and power amplifier, it is characterized in that, described noise canceller circuit comprises the one-way conduction module, time delay module and the switch module that connect successively;
The signal output part of audio output device described in the input termination of described one-way conduction module; The control end of time delay module described in the output termination of described one-way conduction module, the control end of switch module described in the output termination of described time delay module, the power supply termination operating voltage output of described switch module, the input of power amplifier described in the output termination of described switch module.
2. noise canceller circuit as claimed in claim 1, is characterized in that, be also provided with a current limliting module between the output of described one-way conduction module and the control end of described time delay module.
3. noise canceller circuit as claimed in claim 2, it is characterized in that, described one-way conduction module comprises diode D1;
The anode of described diode D1 connects the signal output part of described audio output device, and the negative electrode of described diode D1 connects the input of described current limliting module.
4. noise canceller circuit as claimed in claim 2, it is characterized in that, described current limliting module comprises a current-limiting resistance R4;
Between the output that described current-limiting resistance R4 is connected to described one-way conduction module and the control end of described time delay module.
5. noise canceller circuit as claimed in claim 3, it is characterized in that, described time delay module comprises triode Q1 and resistance R1;
The output of current limliting module described in the control termination of described triode Q1, the control end of switch module described in the high potential termination of described triode Q1, the cold end ground connection of described triode Q1, between the control end that described resistance R1 is connected to described triode Q1 and cold end.
6. noise canceller circuit as claimed in claim 5, it is characterized in that, described triode Q1 is NPN type triode;
The base stage of described NPN type triode, collector and emitter are respectively the control end of described triode Q1, hot end and cold end.
7. noise canceller circuit as claimed in claim 5, it is characterized in that, described triode Q1 is PNP type triode;
The base stage of described PNP type triode, emitter and collector are respectively the control end of described triode Q1, hot end and cold end.
8. the noise canceller circuit as described in any one of claim 5-7, is characterized in that, described switch module comprises metal-oxide-semiconductor Q2 and resistance R2, resistance R3;
The control end of described metal-oxide-semiconductor Q2 connects the hot end of described triode Q1 by described resistance R2, the high potential termination operating voltage output of described metal-oxide-semiconductor Q2, the cold end of described metal-oxide-semiconductor Q2 is the output of described switch module, the input connecing described power amplifier; Between the control end that described resistance R3 is connected to described metal-oxide-semiconductor Q2 and hot end.
9. an audio amplifier, is characterized in that, described audio amplifier comprises the noise canceller circuit as described in any one of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520926825.6U CN205232439U (en) | 2015-11-18 | 2015-11-18 | Denoising circuit and audio amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520926825.6U CN205232439U (en) | 2015-11-18 | 2015-11-18 | Denoising circuit and audio amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN205232439U true CN205232439U (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520926825.6U Active CN205232439U (en) | 2015-11-18 | 2015-11-18 | Denoising circuit and audio amplifier |
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| CN (1) | CN205232439U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181997A (en) * | 2017-06-21 | 2017-09-19 | 滁州学院 | A kind of audio de-noising circuit and with wheat audio amplifier |
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2015
- 2015-11-18 CN CN201520926825.6U patent/CN205232439U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181997A (en) * | 2017-06-21 | 2017-09-19 | 滁州学院 | A kind of audio de-noising circuit and with wheat audio amplifier |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee after: SHENZHE GUANXU ELECTRONIC CO., LTD. Address before: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee before: Shenzhen Grandsun Electronic Co., Ltd. |