CN2802865Y - Silent circuit of earphone - Google Patents
Silent circuit of earphone Download PDFInfo
- Publication number
- CN2802865Y CN2802865Y CN 200520084737 CN200520084737U CN2802865Y CN 2802865 Y CN2802865 Y CN 2802865Y CN 200520084737 CN200520084737 CN 200520084737 CN 200520084737 U CN200520084737 U CN 200520084737U CN 2802865 Y CN2802865 Y CN 2802865Y
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- China
- Prior art keywords
- earphone
- power amplifier
- silencing
- audio
- circuit
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Abstract
The utility model discloses an earphone silencing circuit for televisions. The utility model comprises an earphone socket and a power amplifying chip, wherein one end of a mechanical switch in the earphone socket is connected with a positive 5V DC power supply, and the other end of the mechanical switch is connected with silencing pins of the power amplifying chip through switching elements; when an earphone is inserted, the power supply controls the switching elements to be switched on and the electrical level of the silencing pins is lowered so as to achieve the silencing of the power amplifying chip. The earphone silencing circuit of the utility model is simple in circuit structure and eliminates thoroughly switching popping sound when the earphone is inserted, the switching transition is smooth and natural, and short-distance circuit connection effectively avoids the introduction of high-frequency interference and ensures the high-quality output of sound. Besides, when the power amplifying chip works in a silencing mode, power consumption can be effectively reduced and power energy can be economized.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of television set that is used for and realizes the quiet control circuit of earphone plug.
Background technology
At present, along with the develop rapidly of TV tech,, on many television sets, all be equipped with head circuit for satisfying the growing multiple demand of consumer.When the user appreciates TV programme,, can realize quiet to audio amplifier by earphone being inserted earphone socket on the television set for other people have a rest around not influencing.The earphone socket of existing television set generally is that the break-make by the control mechanical switch realizes the output of audio amplifier and quiet, during operate as normal power amplifier output and loud speaker are connected, disconnect its connection when earphone inserts, sound is exported by earphone, and its circuit connecting relation is referring to shown in the accompanying drawing 1.Adopt this quiet mode, earphone is in the process of plug, and sonic boom is switched in the output of audio amplifier regular meeting, has caused adverse influence for user's the sense of hearing.And this connected mode needs the output signal that sound accompaniment is handled is guided on the earphone socket when the PCB routing more complicated, draws back the input of power amplifier again, and this makes cable run distance long, has increased the difficulty of setting type.And, because cabling is circuitous, in the time of near the digital high-frequency signal of process, very easily in audio signal, introduces and disturb, influence the normal output of sound.
Summary of the invention
The utility model can produce the switching sonic boom in order to solve in the prior art television set earphone audio amplifier when the plug, influence the problem of user's auditory effect, a kind of novel earphone mute circuit is provided, realized the thoroughly quiet of audio amplifier by simple circuit configuration, avoided the generation of sonic boom, and switch the slick and sly nature of transition, be difficult for introducing High-frequency Interference.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of earphone mute circuit comprises earphone socket and audio-frequency power amplifier, it is characterized in that: the quiet end of described audio-frequency power amplifier be connected with one when earphone inserts the control circuit of output mute signal.
As the further qualification to technique scheme, in described earphone socket, an end of mechanical switch connects DC power supply, and the other end links to each other with the quiet end of described audio-frequency power amplifier by switch element.
As the further qualification again to technique scheme, described switch element adopts triode to realize that wherein, the base stage of triode links to each other with mechanical switch, and collector electrode links to each other grounded emitter with the quiet end of audio-frequency power amplifier.
As the further qualification again to technique scheme, the base stage of described triode links to each other with the mute signal output of television set inside by a diode, and collector electrode links to each other with a direct current power supply through resistance.
As to further the limiting again of technique scheme, on the line of the base stage of described triode and mechanical switch, also be connected with a diode, it is the power amplifier chip realization of TDA7297 that described audio-frequency power amplifier then adopts a model.
Compared with prior art, advantage of the present utility model with good effect is: the utility model is connected mechanical switch one end of earphone socket+the 5V DC power supply, and the other end connects the quiet pin of power amplifier chip by switch element.When earphone inserts, power control switch element closure, and then the level of described quiet pin dragged down, thus realized quiet to the power amplifier chip.This earphone mute circuit is simple in structure, has thoroughly eliminated the switching sonic boom when earphone inserts, and switches the slick and sly nature of transition, and short-range circuit connects the introducing of effectively having avoided High-frequency Interference, has guaranteed the high-quality output of sound.In addition, the power amplifier chip operation can effectively reduce the loss of power at silent mode, and saves energy has wide application.
Description of drawings
Fig. 1 is the schematic diagram of employed earphone mute circuit in the existing television set;
Fig. 2 is the concrete circuit connection diagram of earphone mute circuit of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Among Fig. 2, earphone socket XS08 comprises that 11 connect pin, wherein, 1 pin and 4 pin are connected the R channel output HP_MAIN_OUTR and the L channel output HP_MAIN_OUTL of the inner sound accompaniment circuit of television set respectively, and 6 pin of its mechanical switch link to each other with+5V DC power supply through resistance R 045.When not having earphone to insert, 6 pin of mechanical switch link to each other with 7 pin, and 8 pin link to each other with the base stage of NPN type triode V513 through diode VD501, resistance R 651.When not having quiet instruction to send, triode V513 is in cut-off state, and the 12V DC power supply affacts the quiet end MUTE of audio-frequency power amplifier N6 through resistance R 653 and resistance R 650, and described quiet end MUTE low level is effective, therefore, Ci Shi voice signal is normally exported by loud speaker.
When earphone inserts earphone socket XS08,6 pin of mechanical switch and 8 pin are connected, + 5V DC power supply affacts the base stage of triode V513 through resistance R 045, diode VD501 and resistance R 651, control its conducting, because the grounded emitter of triode V513, and then the current potential that will be connected the quiet end MUTE on its collector electrode drags down, and control audio power amplifier N6 enters silent mode, the audio frequency output of blocking-up loud speaker.At this moment, the left and right acoustic channels audio signal of sound accompaniment circuit output is exported by the earphone that is connected on the earphone socket XS08, and then has realized the quiet of audio amplifier.
In addition, in audio signal in the process of the normal output of loud speaker, if the user sends quiet instruction by remote controller, at this moment, the quiet control signal MUTE1 of high level affacts the base stage of triode V513 by diode VD504 and resistance R 651, control its conducting, and then drag down the level of quiet end MUTE, realize the quiet of loud speaker.
It is the power amplifier chip realization of TDA7297 that audio-frequency power amplifier N6 of the present utility model adopts model, because its inner mute function has characteristics such as volume gradual change and cut-out amplifying circuit, therefore can thoroughly eliminate and insert the switching sonic boom of earphone when quiet, and, the power amplifier chip operation also can effectively reduce power loss, saves energy at silent mode.
Above-mentioned earphone mute circuit is simple in structure, and wiring is convenient, has avoided in the existing television set earphone mute circuit cabling circuitous, the deficiency of distance.Therefore, can effectively avoid the introducing of high-frequency interferencing signal, guarantee the high-quality output of audio signal, satisfy user's hearing enjoying, have higher utility and wide application.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (8)
1. an earphone mute circuit comprises earphone socket and audio-frequency power amplifier, it is characterized in that: the quiet end of described audio-frequency power amplifier be connected with one when earphone inserts the control circuit of output mute signal.
2. earphone mute circuit according to claim 1 is characterized in that: in described earphone socket, an end of mechanical switch connects DC power supply, and the other end links to each other with the quiet end of described audio-frequency power amplifier by switch element.
3. earphone mute circuit according to claim 2 is characterized in that: described switch element adopts triode to realize that wherein, the base stage of triode links to each other with mechanical switch, and collector electrode links to each other grounded emitter with the quiet end of audio-frequency power amplifier.
4. earphone mute circuit according to claim 3 is characterized in that: the base stage of described triode links to each other with the mute signal output of television set inside.
5. earphone mute circuit according to claim 3 is characterized in that: the collector electrode of described triode links to each other with DC power supply through resistance.
6. earphone mute circuit according to claim 2 is characterized in that: be connected with a diode on the line of the base stage of described triode and mechanical switch.
7. earphone mute circuit according to claim 3 is characterized in that: be connected with a diode on the line of the mute signal output of the base stage of described triode and television set inside.
8. earphone mute circuit according to claim 3 is characterized in that: it is the power amplifier chip realization of TDA7297 that described audio-frequency power amplifier adopts a model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520084737 CN2802865Y (en) | 2005-06-27 | 2005-06-27 | Silent circuit of earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520084737 CN2802865Y (en) | 2005-06-27 | 2005-06-27 | Silent circuit of earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2802865Y true CN2802865Y (en) | 2006-08-02 |
Family
ID=36847569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520084737 Expired - Fee Related CN2802865Y (en) | 2005-06-27 | 2005-06-27 | Silent circuit of earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2802865Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768558A (en) * | 2011-05-05 | 2012-11-07 | 鸿富锦精密工业（深圳）有限公司 | All-in-one computer having function of muting loudspeaker |
| CN101937681B (en) * | 2009-06-29 | 2013-06-05 | 深圳富泰宏精密工业有限公司 | Surge eliminating device and method |
| CN101453198B (en) * | 2007-12-07 | 2015-08-05 | 瑞昱半导体股份有限公司 | The popping inhibition method of exchange audio power amplifier |
| CN108391203A (en) * | 2018-02-27 | 2018-08-10 | Tcl通力电子（惠州）有限公司 | Audio playing control method and device, audio playing equipment and system |
| CN114051193A (en) * | 2021-08-11 | 2022-02-15 | 安克创新科技股份有限公司 | Earphone set |
-
2005
- 2005-06-27 CN CN 200520084737 patent/CN2802865Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101453198B (en) * | 2007-12-07 | 2015-08-05 | 瑞昱半导体股份有限公司 | The popping inhibition method of exchange audio power amplifier |
| CN101937681B (en) * | 2009-06-29 | 2013-06-05 | 深圳富泰宏精密工业有限公司 | Surge eliminating device and method |
| CN102768558A (en) * | 2011-05-05 | 2012-11-07 | 鸿富锦精密工业（深圳）有限公司 | All-in-one computer having function of muting loudspeaker |
| CN108391203A (en) * | 2018-02-27 | 2018-08-10 | Tcl通力电子（惠州）有限公司 | Audio playing control method and device, audio playing equipment and system |
| CN108391203B (en) * | 2018-02-27 | 2021-08-24 | Tcl通力电子（惠州）有限公司 | Audio playing control method and device, audio playing equipment and system |
| CN114051193A (en) * | 2021-08-11 | 2022-02-15 | 安克创新科技股份有限公司 | Earphone set |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |