CN203537555U - Audio device - Google Patents
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- CN203537555U CN203537555U CN201320605079.1U CN201320605079U CN203537555U CN 203537555 U CN203537555 U CN 203537555U CN 201320605079 U CN201320605079 U CN 201320605079U CN 203537555 U CN203537555 U CN 203537555U
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Abstract
The utility model discloses an audio device which comprises an audio input end, a blocking capacitor C0, an audio processing module, ad an audio noise-reduction circuit. The audio input end, the blocking capacitor C0 and the audio processing module are sequentially connected. The audio noise-reduction circuit is connected with the blocking capacitor C0 and the output end of the audio processing module. The audio noise-reduction circuit comprises an amplification unit, a rectification filter unit, and a control unit which is used for control the output end of the audio processing module to be grounded or not to be grounded according to the voltage amplitude of an input signal of an audio input end. The blocking capacitor C0, the amplification unit, the rectification filter unit, the control unit and the output end of the audio processing module are sequentially connected. The audio device is used for comparing the voltage amplitude of an audio signal through the audio noise-reduction circuit, so as to judge whether the signal is noise or not. When the signal is judged to be noise, the subsequent transmission and playing of the audio signal are stopped, thereby avoiding the noise playing of a loudspeaker.
Description
Technical field
The utility model relates to a kind of audio devices, particularly a kind of audio devices with Dolby circuit.
Background technology
Along with household electrical appliances, mobile phone, computer etc., have in recent years electronic product universal of voice play function, the development in audio-visual broadcasting field is also more and more faster, and people are also more and more higher to the requirement of tonequality simultaneously.Conventionally when inputting without source of sound, that is to say while there is no audio plays, loud speaker should be in mute state in theory, voiceless sound output.Yet circuit self difficulty of actual audio devices can be exempted to produce noise and can receive noise signal unavoidably, cause under the state without source of sound input, loud speaker still plays out noise.
Nowadays, the mode of noise signal when filtering is inputted without source of sound is varied, but the principle realizing and circuit structure are complicated, is unfavorable for the requirement of signal debugging and audio frequency apparatus miniaturization.
Utility model content
Based on this, be necessary to provide a kind of audio devices simple in structure.
A kind of audio devices, comprise: audio input end, capacitance C0, audio processing modules and audio defeat circuit, described audio input end, described capacitance C0 is connected successively with described audio processing modules, described audio defeat circuit is connected with the output of described capacitance C0 and described audio processing modules respectively, described audio defeat circuit comprises: amplifying unit, rectification filtering unit and for the output of controlling described audio processing modules according to the voltage amplitude of the described audio input end input signal control unit of ground connection whether, described capacitance C0, described amplifying unit, described rectification filtering unit, the output of described control unit and described audio processing modules is connected successively.
In one of them embodiment, described amplifying unit comprises: resistance R 1 and R2, triode Q1, power supply VCC1, the base stage of described triode Q1 is connected with described power supply VCC1 with described resistance R 2 through described resistance R 1 respectively with collector electrode, the grounded emitter of described triode Q1, the base stage of described triode Q1 is connected with described capacitance C0, and the collector electrode of described triode Q1 is connected with described rectification filtering unit.
In one of them embodiment, described rectification filtering unit comprises: diode D1 and filter capacitor C2, the positive pole of described diode D1 is connected with described amplifying unit, and negative pole is connected with described control unit, and described filter capacitor C2 connects respectively negative pole and the ground of described diode D1.
In one of them embodiment, described control unit comprises: triode Q2 and Q3, power supply VCC2, resistance R 3, R4, R5, R6 and R7, described rectification filtering unit, described resistance R 3 and the base stage of described triode Q2 are connected successively, and described resistance R 4 connects respectively base stage and the ground of described triode Q2; The grounded emitter of described triode Q2, described resistance R 5 is connected between the collector electrode and described power supply VCC2 of described triode Q2; Described resistance R 6 is connected between the collector electrode of triode Q2 and the base stage of triode Q3, and described resistance R 7 is connected between the base stage and ground of described triode Q3; The grounded emitter of described triode Q3, the collector electrode of described triode Q3 is connected with the output of described audio processing modules.
In one of them embodiment, also comprise power amplifier module and loud speaker, described audio processing modules, described power amplifier module and described loud speaker are connected successively.
In one of them embodiment, described audio defeat circuit also comprises capacitance C1, and described amplifying unit is connected with described capacitance C0 by described capacitance C1.
Compared to prior art, above-mentioned audio devices judges by the voltage amplitude of audio defeat circuit comparing audio signal whether it is noise, and when being judged as noise, stops subsequent transmission and the broadcasting of this audio signal, avoids loud speaker to play noise.Above-mentioned audio defeat circuit structure is simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is the structural representation of the audio devices of the utility model one preferred embodiment;
Fig. 2 is the circuit theory diagrams of audio defeat circuit shown in Fig. 1.
Embodiment
As shown in Figure 1, it is the structural representation of the audio devices 10 of the utility model one preferred embodiment, comprising: audio input end 100, capacitance C0, audio processing modules 102, power amplifier module 103, loud speaker 104 and audio defeat circuit 200.Audio input end 100, capacitance C0, audio processing modules 102, power amplifier module 103 and loud speaker 104 are connected successively; Audio defeat circuit 200 is connected with the output of audio processing modules 102 with capacitance C0 respectively.
Capacitance C0 is for the audio signal of audio reception input 100 inputs, and isolation flip-flop wherein is also exported.Audio processing modules 102 carries out audio processing output for receiving the audio signal of capacitance C0 output.
In the present embodiment, audio processing modules 102 receives capacitance C0 every the straight audio signal of processing and need to carry out to described signal a series of processing such as A/D conversion, DSP, volume adjusting according to system.Power amplifier module 103, for the audio signal of audio reception processing module 102 outputs, carries out power amplification to audio signal, and output.
In the present embodiment, the audio signal of power amplifier module 103 audio reception processing module 102 outputs, because the audio signal underpower of audio processing modules 102 outputs is sounded with driving loud speaker 104, the audio signal of 103 pairs of receptions of required power amplification module is carried out power amplification processing, and exports high-power audio signal.Loud speaker 104 is for the high-power audio signal of received power amplification module 103 outputs, output sound signal.
Capacitance C0, capacitance C1, amplifying unit 202, rectification filtering unit 203, control unit 204 and the output of audio processing modules 102 are connected successively.
Amplifying unit 202 comprises: resistance R 1 and R2, triode Q1 and power supply VCC1.
The base stage of described triode Q1 is connected with described power supply VCC1 with described resistance R 2 through described resistance R 1 respectively with collector electrode, the grounded emitter of described triode Q1, the base stage of described triode Q1 is also connected with capacitance C0 by capacitance C1, and the collector electrode of described triode Q1 is also connected with described rectification filtering unit 203.
The positive pole of diode D1 is connected with the collector electrode of triode Q1, and negative pole is connected with control unit 204.Filter capacitor C2 connects respectively negative pole and the ground of described diode D1.
The negative pole of diode D1 is connected to the base stage of described triode Q2 through resistance R 3, resistance R 4 is connected between the base stage and ground of triode Q2.The grounded emitter of triode Q2, resistance R 5 is connected between the collector electrode and power supply VCC2 of triode Q2.Resistance R 6 is connected between the collector electrode of triode Q2 and the base stage of triode Q3, and resistance R 7 is connected between the base stage and ground of triode Q3.The grounded emitter of triode Q3, the collector electrode of triode Q3 is connected with the output of audio processing modules 102.
The operation principle of above-mentioned audio devices 10 is as follows:
The audio signal of capacitance C0 audio reception input 100 inputs, and the flip-flop in filtering audio signal.The signal of capacitance C0 output divides two-way output: a road enters audio processing modules 102, and audio processing modules 102 need to carry out to signal a series of processing such as A/D conversion, DSP, volume adjusting according to system; Separately lead up to capacitance C1, through the signal of triode Q1, amplify, wherein, resistance R 2 is biasing resistors of the collector electrode of triode Q1, and the effect of R2 is for amplifying unit 202 arranges rational quiescent point, makes the stable output of amplifying signal.The audio signal of amplifying is through the rectifying and wave-filtering effect by diode D1 and filter capacitor C2, the direct current signal that output ripple is level and smooth, the base stage that described direct current signal enters triode Q2 through resistance R 3, the combination of resistance R 4 and resistance R 3 is that the base stage for triode Q2 provides bias voltage.
When the signal of capacitance C0 reception input is noise signal, because the voltage amplitude of noise signal is very little, amplification, rectification through amplifying unit 102, rectification filtering unit 103 are processed, the direct current signal of output is still very little, causes the bias voltage deficiency that is added in triode Q2 base stage so that Q2 conducting.Now, triode Q2 cut-off, is equivalent to open circuit.The base stage that is combined as triode Q3 of resistance R 6 and resistance R 7 provides bias voltage, makes triode Q3 conducting.The signal of audio processing modules 102 outputs, by the collector and emitter of triode Q3, flows to ground, and no longer through power amplifier module 103, flows to loud speaker 104, has reduced the noise that loud speaker 104 sends.
When the signal of capacitance C0 reception input is audio signal, because the voltage amplitude of audio signal is larger, amplification, rectification through amplifying unit 102, rectification filtering unit 103 are processed, and the direct current signal of output is also larger, and the bias voltage that is added in triode Q2 base stage makes Q2 conducting.Now, the base stage of triode Q3 is low-voltage, and triode Q3 cut-off, is equivalent to open circuit.The audio signal of audio processing modules 102 output is after the power amplification of power amplifier module 103, by loud speaker 104 signal of sounding.
Feature according to the voltage amplitude of noise signal lower than the voltage amplitude of audio signal, arranges the component parameter in circuit.When the voltage amplitude of the signal receiving as capacitance C0 is greater than decision threshold, triode Q2 conducting, loud speaker 104 is sounded.Like this, whether the audio signal that Dolby circuit 200 receives according to identification is that noise is controlled audio processing modules 102 and whether audio signal exported to power amplifier module 103, reaches the object of filtering noise.
Above-mentioned audio devices 10 judges by the voltage amplitude of audio defeat circuit 200 comparing audio signals whether it is noise, and when being judged as noise, stops subsequent transmission and the broadcasting of this audio signal, avoids loud speaker 104 to play noise.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (6)
1. an audio devices, is characterized in that, comprising: audio input end, capacitance C0, audio processing modules and audio defeat circuit,
Described audio input end, described capacitance C0 are connected successively with described audio processing modules, and described audio defeat circuit is connected with the output of described capacitance C0 and described audio processing modules respectively,
Described audio defeat circuit comprises: amplifying unit, rectification filtering unit and for the output of controlling described audio processing modules according to the voltage amplitude of the described audio input end input signal control unit of ground connection whether,
The output of described capacitance C0, described amplifying unit, described rectification filtering unit, described control unit and described audio processing modules is connected successively.
2. audio devices according to claim 1, is characterized in that, described amplifying unit comprises: resistance R 1 and R2, triode Q1, power supply VCC1,
The base stage of described triode Q1 is connected with described power supply VCC1 with described resistance R 2 through described resistance R 1 respectively with collector electrode, the grounded emitter of described triode Q1, the base stage of described triode Q1 is connected with described capacitance C0, and the collector electrode of described triode Q1 is connected with described rectification filtering unit.
3. audio devices according to claim 1, it is characterized in that, described rectification filtering unit comprises: diode D1 and filter capacitor C2, the positive pole of described diode D1 is connected with described amplifying unit, negative pole is connected with described control unit, and described filter capacitor C2 connects respectively negative pole and the ground of described diode D1.
4. audio devices according to claim 1, is characterized in that, described control unit comprises: triode Q2 and Q3, power supply VCC2, resistance R 3, R4, R5, R6 and R7,
Described rectification filtering unit, described resistance R 3 and the base stage of described triode Q2 are connected successively, and described resistance R 4 is connected between the base stage and ground of described triode Q2; The grounded emitter of described triode Q2, described resistance R 5 is connected between the collector electrode and described power supply VCC2 of described triode Q2; Described resistance R 6 is connected between the collector electrode of triode Q2 and the base stage of triode Q3, and described resistance R 7 is connected between the base stage and ground of described triode Q3; The grounded emitter of described triode Q3, the collector electrode of described triode Q3 is connected with the output of described audio processing modules.
5. audio devices according to claim 1, is characterized in that, also comprises power amplifier module and loud speaker, and described audio processing modules, described power amplifier module and described loud speaker are connected successively.
6. audio devices according to claim 1, is characterized in that, described audio defeat circuit also comprises capacitance C1, and described amplifying unit is connected with described capacitance C0 by described capacitance C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320605079.1U CN203537555U (en) | 2013-09-27 | 2013-09-27 | Audio device |
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| CN201320605079.1U CN203537555U (en) | 2013-09-27 | 2013-09-27 | Audio device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469621A (en) * | 2014-12-09 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Anti-interference circuit and method of voice remote controller |
| CN104581530A (en) * | 2014-12-23 | 2015-04-29 | 福建星网视易信息系统有限公司 | Circuit, device and system for reducing signal noise |
| CN107889024A (en) * | 2017-11-21 | 2018-04-06 | 深圳市沃特沃德股份有限公司 | Voicefrequency circuit and vehicle control syetem |
| CN107979786A (en) * | 2017-11-03 | 2018-05-01 | 东莞市美之尊电子科技有限公司 | A kind of sound equipment for supporting more USB flash disks and the broadcasting of more bluetooths |
| CN109089185A (en) * | 2018-07-27 | 2018-12-25 | 成都信息工程大学 | A kind of intelligent earphone |
| CN109243480A (en) * | 2018-07-02 | 2019-01-18 | 深圳市泰和安科技有限公司 | Background noise circuit and its control method are eliminated for fire-fighting system |
| CN110913311A (en) * | 2019-05-23 | 2020-03-24 | 奥佳华智能健康科技集团股份有限公司 | Chair cushion and chair are competed to electricity |
-
2013
- 2013-09-27 CN CN201320605079.1U patent/CN203537555U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469621A (en) * | 2014-12-09 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Anti-interference circuit and method of voice remote controller |
| CN104469621B (en) * | 2014-12-09 | 2018-09-11 | 歌尔智能科技有限公司 | A kind of voice remote controller anti-jamming circuit and method |
| CN104581530A (en) * | 2014-12-23 | 2015-04-29 | 福建星网视易信息系统有限公司 | Circuit, device and system for reducing signal noise |
| CN107979786A (en) * | 2017-11-03 | 2018-05-01 | 东莞市美之尊电子科技有限公司 | A kind of sound equipment for supporting more USB flash disks and the broadcasting of more bluetooths |
| CN107889024A (en) * | 2017-11-21 | 2018-04-06 | 深圳市沃特沃德股份有限公司 | Voicefrequency circuit and vehicle control syetem |
| CN109243480A (en) * | 2018-07-02 | 2019-01-18 | 深圳市泰和安科技有限公司 | Background noise circuit and its control method are eliminated for fire-fighting system |
| CN109089185A (en) * | 2018-07-27 | 2018-12-25 | 成都信息工程大学 | A kind of intelligent earphone |
| CN110913311A (en) * | 2019-05-23 | 2020-03-24 | 奥佳华智能健康科技集团股份有限公司 | Chair cushion and chair are competed to electricity |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20210927 |
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| CF01 | Termination of patent right due to non-payment of annual fee |