CN205232334U - Audio frequency noise suicide circuit and audio -visual equipment - Google Patents
Audio frequency noise suicide circuit and audio -visual equipment Download PDFInfo
- Publication number
- CN205232334U CN205232334U CN201521019093.9U CN201521019093U CN205232334U CN 205232334 U CN205232334 U CN 205232334U CN 201521019093 U CN201521019093 U CN 201521019093U CN 205232334 U CN205232334 U CN 205232334U
- Authority
- CN
- China
- Prior art keywords
- resistance
- output
- voltage pull
- down circuits
- switching tube
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses an audio frequency noise suicide circuit and audio -visual equipment, this audio frequency denoising circuit include power supply, be used for making the drive circuit that drives drop -down circuit conduction of first voltage and the drop -down circuit conduction of second voltage can hold no control signal to input the time, being used for when switching on the first voltage pull -down circuit of audio frequency L channel output voltage ground connection and being used for with audio frequency R channel output voltage ground connection second voltage pull -down circuit when switching on, power supply is connected with drive circuit's power end, and drive circuit's messenger can hold and be used for receiving external control signal, and drive circuit's output is connected with the controlled end of first voltage pull -down circuit and the controlled end of second voltage pull -down circuit respectively, the output and the audio frequency L channel output of first voltage pull -down circuit are connected, the output and the audio frequency R channel output of second voltage pull -down circuit are connected. The utility model discloses reduce the noise among last electricity or the outage in -process audio circuit, improved the output audio quality.
Description
Technical field
The utility model relates to audio signal processing technique field, and particularly a kind of audio noise is eliminated circuit and comprised the audio-visual equipment that this audio-frequency noise eliminates circuit.
Background technology
The requisite part of voice output every platform TV, except Speaker is as the main body voice output part of television system, other such as HDMI voice output, AVLINEOUT voice output, SPDIF voice output and headphones sound export, also be a requisite part of TV system, its performance directly has influence on the sound performance of a TV system.Speaker is as a part for TV system complete machine, and often its performance mixes up, and can not go out too large problem, but other voice output part, because user is random large, its device category connected is widely, therefore, the voice output performance of this part seems extremely important.Such as, when AVLINEOUT is connected to a HIFI power amplification system by user, some nibs are all likely exaggerated, and cause serious impact.
Concrete, on a television set in electricity or power process, because the reasons such as audio interface voltage jump can produce noise, noise, POP sound etc., because external equipment is with power amplifier, these noises, noise, POP sound can be exaggerated, and user will be made to feel uncomfortable.
Utility model content
Main purpose of the present utility model is to provide a kind of audio noise and eliminates circuit, is intended to reduce the noise in voicefrequency circuit, improves output audio quality.
For achieving the above object, the audio noise that the utility model proposes eliminates circuit, comprises power supply, drive circuit, the first voltage pull-down circuits and the second voltage pull-down circuits; Described power supply is connected with the power end of described drive circuit, the Enable Pin of described drive circuit is for receiving external control signal, and the output of described drive circuit is connected with the controlled end of described first voltage pull-down circuits and the controlled end of the second voltage pull-down circuits respectively; The output of described first voltage pull-down circuits is connected with audio frequency L channel output; The output of described second voltage pull-down circuits is connected with audio frequency R channel output; Wherein,
Described drive circuit, for driving described first voltage pull-down circuits and described second voltage pull-down circuits conducting and driving described first voltage pull-down circuits and described second voltage pull-down circuits cut-off when Enable Pin input control signal when Enable Pin inputs without control signal;
Described first voltage pull-down circuits, exports for described audio frequency L channel output end voltage ground connection being ended when conducting and when ending, described audio frequency L channel output is normally exported;
Described second voltage pull-down circuits, exports for described audio frequency R channel output end voltage ground connection being ended when conducting and when ending, described audio frequency R channel output is normally exported.
Preferably, described drive circuit comprises field effect transistor or triode, described field effect transistor or triode when inputting without control signal conducting and export high level to described first voltage pull-down circuits and described second voltage pull-down circuits and when there being control signal input cut-off and output low level extremely described first voltage pull-down circuits and described second voltage pull-down circuits.
Preferably, described drive circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first switching tube and second switch pipe; The first end of described first resistance is connected with described power supply, and the second end of described first resistance is connected with the output of described first switching tube; The first end of described second resistance is the Enable Pin of described drive circuit, and the second end of described second resistance is connected with the input of described first switching tube; Be connected with the output of described first switching tube after described 3rd resistance of input series connection of described second switch pipe, the output of described second switch pipe is the output of described drive circuit; The first end of described 4th resistance is connected with described power supply, and the second end of described 4th resistance is connected with the first end of described second resistance.
Preferably, described drive circuit also comprises the first electric capacity, and the first end of described first electric capacity is connected with the second end of described first resistance, the second end ground connection of described first electric capacity.
Preferably, described first voltage pull-down circuits comprises the 5th resistance and the 3rd switching tube; The first end of described 5th resistance is connected with the output of described drive circuit, and the second end of described 5th resistance is connected with the input of described 3rd switching tube, and the output of described 3rd switching tube is connected with described audio frequency L channel output.
Preferably, described first voltage pull-down circuits also comprises the 6th resistance and the 4th switching tube; The first end of described 6th resistance is connected with the output of described drive circuit, and the second end of described 6th resistance is connected with the input of described 4th switching tube, and the output of described 4th switching tube is connected with described audio frequency L channel output.
Preferably, described first voltage pull-down circuits also comprises the second electric capacity, and the first end of described second electric capacity is connected with described audio frequency L channel output, the second end ground connection of described second electric capacity.
Preferably, described second voltage pull-down circuits comprises the 7th resistance and the 5th switching tube; The first end of described 7th resistance is connected with the output of described drive circuit, and the second end of described 7th resistance is connected with the input of described 5th switching tube, and the output of described 5th switching tube is connected with described audio frequency R channel output.
Preferably, described second voltage pull-down circuits also comprises the 8th resistance, the 6th switching tube and the 3rd electric capacity; The first end of described 8th resistance is connected with the output of described drive circuit, second end of described 8th resistance is connected with the input of described 6th switching tube, the output of described 6th switching tube is connected with described audio frequency R channel output, the first end of described 3rd electric capacity is connected with described audio frequency R channel output, the second end ground connection of described 3rd electric capacity.
The utility model also proposes a kind of audio-visual equipment, and described audio-visual equipment comprises audio noise as above and eliminates circuit, and described elimination circuit comprises power supply, drive circuit, the first voltage pull-down circuits and the second voltage pull-down circuits; Described power supply is connected with the power end of described drive circuit, the Enable Pin of described drive circuit is for receiving external control signal, and the output of described drive circuit is connected with the controlled end of described first voltage pull-down circuits and the controlled end of the second voltage pull-down circuits respectively; The output of described first voltage pull-down circuits is connected with audio frequency L channel output; The output of described second voltage pull-down circuits is connected with audio frequency R channel output; Wherein, described drive circuit, for when Enable Pin inputs without control signal, drives described first voltage pull-down circuits conducting and described second voltage pull-down circuits conducting; When Enable Pin input control signal, described drive circuit drives described first voltage pull-down circuits conducting and described second voltage pull-down circuits cut-off; Described first voltage pull-down circuits, for when conducting by described audio frequency L channel output end voltage ground connection; Described second voltage pull-down circuits, for when conducting by described audio frequency R channel output end voltage ground connection.
Technical solutions of the utility model are by arranging power supply, drive circuit, first voltage pull-down circuits and the second voltage pull-down circuits, define a kind of audio noise and eliminate circuit, at audio-visual equipment, such as television set powers on or in power process, the Enable Pin of described drive circuit inputs without control signal, described drive circuit drives described first voltage pull-down circuits and the conducting simultaneously of the second voltage pull-down circuits, by described audio frequency L channel output end voltage and described audio frequency R channel output end voltage access the earth, drag down output voltage, thus audio frequency L channel and the equal voiceless sound of audio frequency R channel are exported, eliminate noise, improve audio frequency output quality.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, the structure according to these accompanying drawings can also obtain other accompanying drawing.
Fig. 1 is the functional block diagram that the utility model preferred embodiment audio noise eliminates circuit;
Fig. 2 is the physical circuit figure that the utility model preferred embodiment audio noise eliminates circuit.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 100 | Power supply | R8 | 8th resistance |
| 200 | Drive circuit | Q1 | First switching tube |
| 300 | First voltage pull-down circuits | Q2 | Second switch pipe |
| 400 | Second voltage pull-down circuits | Q3 | 3rd switching tube |
| R1 | First resistance | Q4 | 4th switching tube |
| R2 | Second resistance | Q5 | 5th switching tube |
| R3 | 3rd resistance | Q6 | 6th switching tube |
| R4 | 4th resistance | C1 | First electric capacity |
| R5 | 5th resistance | C2 | Second electric capacity |
| R6 | 6th resistance | C3 | 3rd electric capacity |
| R7 | 7th resistance |
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Need explanation, all directivity instruction (such as up, down, left, right, before and afters in the utility model embodiment ...) only for explaining the relative position relation, motion conditions etc. under a certain particular pose (as shown in drawings) between each parts, if when this particular pose changes, then directionality instruction also correspondingly changes thereupon.
In addition, in the utility model, relate to the description of " first ", " second " etc. only for describing object, and instruction can not be interpreted as or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In addition; technical scheme between each embodiment can be combined with each other; but must be can be embodied as basis with those of ordinary skill in the art; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme does not exist, also not the utility model require protection range within.
The utility model proposes a kind of audio noise and eliminate circuit.
Please refer to Fig. 1, in the utility model one embodiment, described audio noise is eliminated circuit and is comprised power supply 100, drive circuit 200, first voltage pull-down circuits 300 and the second voltage pull-down circuits 400; Described power supply 100 is connected with the power end of described drive circuit 200, the Enable Pin of described drive circuit 200 is for receiving external control signal, and the output of described drive circuit 200 is connected with the controlled end of described first voltage pull-down circuits 300 and the controlled end of the second voltage pull-down circuits 400 respectively; The output of described first voltage pull-down circuits 300 is connected with audio frequency L channel output; The output of described second voltage pull-down circuits 400 is connected with audio frequency R channel output.
Described drive circuit 200, for driving described first voltage pull-down circuits 300 and described second voltage pull-down circuits 400 conducting and driving when Enable Pin has control signal to input the first voltage pull-down circuits 300 and the second voltage pull-down circuits 400 to end when Enable Pin inputs without control signal; Described first voltage pull-down circuits 300, for when conducting by described audio frequency L channel output end voltage ground connection; Described second voltage pull-down circuits 400, for making described audio frequency R channel output end voltage ground connection when conducting; Simultaneously, first voltage pull-down circuits 300 makes audio frequency L channel output end voltage be high level when ending, now left channel audio signal normally exports, and make audio frequency R channel output end voltage be high level when the second voltage pull-down circuits 400 is ended, now right channel audio signal normally exports.
It should be noted that, in the present embodiment, this audio noise is eliminated circuit and is used for television set.Tv audio interface access external equipment, such as power amplifying device, television set power on or power-off time, the Enable Pin of described drive circuit 200 inputs without control signal, now drive circuit 200 exports high level signal, drive described first voltage pull-down circuits 300, the conducting simultaneously of second voltage pull-down circuits 400, described first voltage pull-down circuits 300 is by described audio frequency L channel output end voltage ground connection, described second voltage pull-down circuits 400 is by described audio frequency R channel output end voltage access the earth, audio frequency L channel and the equal voiceless sound signal of audio frequency R channel is made to export like this, noise also just can not export.In addition, after television set has mated with power amplifying device, drive circuit 200 Enable Pin has control signal to input, now drive circuit 200 output output low level signal, described first voltage pull-down circuits 300 and the second voltage pull-down circuits 400 turn off, now audio frequency L channel and the normal output audio signal of audio frequency R channel.
Technical solutions of the utility model are by arranging power supply 100, drive circuit 200, first voltage pull-down circuits 300 and the second voltage pull-down circuits 400, define a kind of audio noise and eliminate circuit, at audio-visual equipment, such as television set power on or power-off time, the Enable Pin of described drive circuit 200 inputs without control signal, now described drive circuit 200 drives described first voltage pull-down circuits 300 and the conducting simultaneously of the second voltage pull-down circuits 400, by described audio frequency L channel output end voltage and described audio frequency R channel output end voltage access the earth, drag down output voltage, thus audio frequency L channel and the equal voiceless sound of audio frequency R channel are exported, thus eliminate the noise powered on or in power process, improve audio frequency output quality.
Please refer to Fig. 2, particularly, described drive circuit 200 comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the first switching tube Q1 and second switch pipe Q2, wherein the first switching tube Q1 and second switch pipe Q2 can be field effect transistor or triode, in the present embodiment for the first switching tube Q1 and second switch pipe Q2 for NPN type triode is described.Concrete, the first end of described first resistance R1 is connected with power supply VCC1 (power supply 100 namely in Fig. 1), and second end of described first resistance R1 is connected with the collector electrode of described first switching tube Q1; The first end of described second resistance R2 is the Enable Pin of described drive circuit 200, and for reception control signal CONTROL, second end of described second resistance R2 is connected with the base stage of described first switching tube Q1; The grounded emitter of described first switching tube Q1; The collector electrode of described second switch pipe Q2 is connected with described power supply VCC1, the base stage of described second switch pipe Q2 is connected with second end of described first resistance R1 through described 3rd resistance R3, the output of the very described drive circuit 200 of transmitting of described second switch pipe Q2; The first end of described 4th resistance R4 is connected with described power supply VCC1, and second end of described 4th resistance R4 is connected with the first end of described second resistance R2.
For triode, the operation principle of drive circuit 200 is described for the first switching tube Q1 and second switch pipe Q2 below, is described as follows:
In power up, the Enable Pin of drive circuit 200 inputs without control signal, the collector electrode of the first switching tube Q1 is supplied power to after described power supply VCC1 series resistance R1, power supply VCC1 is connected to the base stage of the first switching tube Q1 by described 4th resistance R4 and the second resistance R2, the base stage of the first switching tube Q1 and the voltage difference of collector electrode reach cut-in voltage, make the first switching tube Q1 conducting, the collector electrode of the first switching tube Q1 is dragged down, the collector voltage of the first switching tube Q1 acts on the base stage of second switch pipe Q2 by the 3rd resistance R3, the emitter of second switch pipe Q2 is connected with power supply VCC, now second switch pipe Q2 conducting, the collector electrode of second switch pipe Q2 exports high level and acts on the first voltage pull-down circuits 300 and the second voltage pull-down circuits 400, first voltage pull-down circuits 300 and the second voltage pull-down circuits 400 are according to high level conducting.
Power on, after system sounds is normal, CONTROL is dragged down, the Enable Pin input low level of drive circuit 200, voltage is connected to the base stage of the first switching tube Q1 by the second resistance R2 and the first switching tube Q1 is ended, now the collector electrode of the first switching tube Q1 is pulled to power supply VCC1 by the first resistance R1, thus the current collection very high level of the first switching tube Q1, the collector voltage of the first switching tube Q1 acts on the base stage of second switch pipe Q2 by the 3rd resistance R3 and second switch pipe Q2 is ended, the collector electrode output low level of second switch pipe Q2 also acts on the first voltage pull-down circuits 300 and the second voltage pull-down circuits 400, first voltage pull-down circuits 300 and the second voltage pull-down circuits 400 are ended according to low level.
Because power-off is consistent with the operation principle of power up sound intermediate frequency noise suicide circuit, no longer describe in detail herein.
Further, described drive circuit 200 also comprises the first electric capacity C1, and described first electric capacity C1 is parallel between the emitter and collector of the first switching tube Q1.First electric capacity C1 plays the effect preventing second switch pipe Q2 output voltage from suddenling change, because electric capacity both end voltage can not be suddenlyd change, after the first switching tube Q1 conducting, by the first electric capacity C1, second switch pipe Q2 controlled end voltage is slowly declined, thus make second switch pipe Q2 output voltage slowly increase, which prevent because voltage jump causes audio noise to export from audio frequency R channel and audio frequency L channel.
Please refer to Fig. 2 again, described first voltage pull-down circuits 300 comprises the 5th resistance R5 and the 3rd switching tube Q3, and wherein the 3rd switching tube Q3 is triode or field effect transistor, in the present embodiment for the 3rd switching tube Q3 for NPN type triode is described.Concrete, the first end of described 5th resistance R5 is connected with the output of described drive circuit 200, second end of described 5th resistance R5 is connected with the base stage (i.e. input) of described 3rd switching tube Q3, the collector electrode (i.e. output) of described 3rd switching tube Q3 is connected with described audio frequency L channel output terminals A udio-L, the grounded emitter of described 3rd switching tube Q3.
It should be noted that, after the 3rd switching tube Q3 conducting, the current collection very low level of the 3rd switching tube Q3, now audio frequency L channel output terminals A udio-L is dragged down ground connection, thus has cut off the output of audio noise.
Further, described first voltage pull-down circuits 300 can also comprise the 6th resistance R6 and the 4th switching tube Q4, and in the present embodiment, the 4th switching tube Q4 is NPN type triode; The first end of described 6th resistance R6 is connected with the output of described drive circuit 200, second end of described 6th resistance R6 is connected with the base stage of described 4th switching tube Q4, the emitter (i.e. output) of described 4th switching tube Q4 is connected with described audio frequency L channel output terminals A udio-L, the grounded collector of described 4th switching tube Q4.
Be understandable that, after the 4th switching tube Q4 conducting, add the passage that an audio frequency L channel output terminals A udio-L connects with ground, accelerate the elimination of audio-frequency noise.
Further, described first voltage pull-down circuits 300 also comprises the second electric capacity C2, and the first end of described second electric capacity C2 is connected with described audio frequency L channel output terminals A udio-L, the second end ground connection of described second electric capacity C2.It should be noted that, the second electric capacity C2 can eliminate external interference signals, further eliminates audio-frequency noise.
Operation principle the following detailed description of the first voltage pull-down circuits 300:
In power up, drive circuit 200 exports high level to the first voltage pull-down circuits 300, namely output high level makes the 3rd switching tube Q3 and the 4th switching tube Q4 conducting to the base stage of the 3rd switching tube Q3 and the 4th switching tube Q4, and then the 3rd switching tube Q3 collector electrode and the transmitting very low level of the 4th switching tube Q4, now, audio frequency L channel output terminals A udio-L is dragged down ground connection, thus has cut off the output of audio noise.
Powered on, system sounds normal after, drive circuit 200 output low level to the first voltage pull-down circuits 300, namely output low level makes the 3rd switching tube Q3 and the 4th switching tube Q4 end to the base stage of the 3rd switching tube Q3 and the 4th switching tube Q4, and then the 3rd switching tube Q3 collector electrode and the emitter of the 4th switching tube Q4 do not dragged down, and then audio frequency L channel output terminals A udio-L level is not dragged down, now audio signal normally exports.
Please refer to Fig. 2 again, described second voltage pull-down circuits 400 comprises the 7th resistance R7 and the 5th switching tube Q5, and wherein the 5th switching tube Q5 is triode or field effect transistor, in the present embodiment for the 5th switching tube Q5 for NPN type triode is described.Concrete, the first end of described 7th resistance R7 is connected with the output of described drive circuit 200, second end of described 7th resistance R7 is connected with the base stage of described 5th switching tube Q5, the collector electrode (i.e. output) of described 5th switching tube Q5 is connected with described audio frequency R channel output terminals A udio-R, the grounded emitter of described 5th switching tube Q5.
It should be noted that, after the 5th switching tube Q5 conducting, the current collection very low level of the 5th switching tube Q5, now audio frequency R channel output terminals A udio-R is dragged down ground connection, thus has cut off the output of audio noise.
Further, described second voltage pull-down circuits 400 also comprises the 8th resistance R8 and the 6th switching tube Q6, and in the present embodiment, the 6th switching tube Q6 is NPN type triode; The first end of described 8th resistance R8 is connected with the output of described drive circuit 200, second end of described 8th resistance R8 is connected with the base stage of described 6th switching tube Q6, the emitter (i.e. output) of described 6th switching tube Q6 is connected with described audio frequency R channel output terminals A udio-R, the grounded collector of described 6th switching tube Q6.
Be understandable that, after the 6th switching tube Q6 conducting, add the passage that an audio frequency R channel output terminals A udio-R connects with ground, accelerate the elimination of audio-frequency noise.
Further, described second voltage pull-down circuits 400 also comprises the 3rd electric capacity C3, and the first end of described 3rd electric capacity C3 is connected with described audio frequency R channel output terminals A udio-R, the second end ground connection of described 3rd electric capacity C3.It should be noted that, the 3rd electric capacity C3 can eliminate external interference signals, further eliminates audio-frequency noise.
Because the second voltage pull-down circuits 400 is identical with the first voltage pull-down circuits 300 operation principle, no longer the operation principle of the second voltage pull-down circuits 400 is described in detail herein.
Technical solutions of the utility model are when the Enable Pin of drive circuit 200 inputs without control signal, namely when outside equipment access television set, drive circuit 200 exports high level signal, make the 3rd switching tube Q3, the 4th switching tube Q4, the 5th switching tube Q5 and the 6th switching tube Q6 conducting, the audio frequency L channel output terminals A udio-L of television set and audio frequency R channel output terminals A udio-R and ground are connected, thus the noise blocking audio frequency L channel and audio frequency R channel exports, eliminate the noise in voicefrequency circuit, improve audio frequency output quality.
The utility model also proposes a kind of audio-visual equipment, this audio-visual equipment comprises audio-frequency noise and eliminates circuit, this audio-frequency noise eliminates the concrete structure of circuit referring to figs. 1 through embodiment illustrated in fig. 2, because this audio-visual equipment have employed whole technical schemes of above-mentioned all embodiments, therefore all beneficial effects that the technical scheme at least having above-described embodiment is brought, this is no longer going to repeat them.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every under inventive concept of the present utility model; utilize the equivalent structure transformation that the utility model specification and accompanying drawing content are done, or directly/be indirectly used in other relevant technical fields to include in scope of patent protection of the present utility model.
Claims (10)
1. audio noise eliminates a circuit, it is characterized in that, comprises power supply, drive circuit, the first voltage pull-down circuits and the second voltage pull-down circuits; Described power supply is connected with the power end of described drive circuit, the Enable Pin of described drive circuit is for receiving external control signal, and the output of described drive circuit is connected with the controlled end of described first voltage pull-down circuits and the controlled end of the second voltage pull-down circuits respectively; The output of described first voltage pull-down circuits is connected with audio frequency L channel output; The output of described second voltage pull-down circuits is connected with audio frequency R channel output; Wherein,
Described drive circuit, for driving described first voltage pull-down circuits and described second voltage pull-down circuits conducting and driving described first voltage pull-down circuits and described second voltage pull-down circuits cut-off when Enable Pin input control signal when Enable Pin inputs without control signal;
Described first voltage pull-down circuits, exports for described audio frequency L channel output end voltage ground connection being ended when conducting and when ending, described audio frequency L channel output is normally exported;
Described second voltage pull-down circuits, exports for described audio frequency R channel output end voltage ground connection being ended when conducting and when ending, described audio frequency R channel output is normally exported.
2. audio noise as claimed in claim 1 eliminates circuit, it is characterized in that, described drive circuit comprises field effect transistor or triode, described field effect transistor or triode when inputting without control signal conducting and export high level to described first voltage pull-down circuits and described second voltage pull-down circuits and when there being control signal input cut-off and output low level extremely described first voltage pull-down circuits and described second voltage pull-down circuits.
3. audio noise as claimed in claim 2 eliminates circuit, and it is characterized in that, described drive circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first switching tube and second switch pipe; The first end of described first resistance is connected with described power supply, and the second end of described first resistance is connected with the output of described first switching tube; The first end of described second resistance is the Enable Pin of described drive circuit, and the second end of described second resistance is connected with the input of described first switching tube; Be connected with the output of described first switching tube after described 3rd resistance of input series connection of described second switch pipe, the output of described second switch pipe is the output of described drive circuit; The first end of described 4th resistance is connected with described power supply, and the second end of described 4th resistance is connected with the first end of described second resistance.
4. audio noise as claimed in claim 3 eliminates circuit, and it is characterized in that, described drive circuit also comprises the first electric capacity, and the first end of described first electric capacity is connected with the second end of described first resistance, the second end ground connection of described first electric capacity.
5. audio noise as claimed in claim 1 eliminates circuit, and it is characterized in that, described first voltage pull-down circuits comprises the 5th resistance and the 3rd switching tube; The first end of described 5th resistance is connected with the output of described drive circuit, and the second end of described 5th resistance is connected with the input of described 3rd switching tube, and the output of described 3rd switching tube is connected with described audio frequency L channel output.
6. audio noise as claimed in claim 5 eliminates circuit, and it is characterized in that, described first voltage pull-down circuits also comprises the 6th resistance and the 4th switching tube; The first end of described 6th resistance is connected with the output of described drive circuit, and the second end of described 6th resistance is connected with the input of described 4th switching tube, and the output of described 4th switching tube is connected with described audio frequency L channel output.
7. audio noise as claimed in claim 6 eliminates circuit, and it is characterized in that, described first voltage pull-down circuits also comprises the second electric capacity, and the first end of described second electric capacity is connected with described audio frequency L channel output, the second end ground connection of described second electric capacity.
8. audio noise as claimed in claim 1 eliminates circuit, and it is characterized in that, described second voltage pull-down circuits comprises the 7th resistance and the 5th switching tube; The first end of described 7th resistance is connected with the output of described drive circuit, and the second end of described 7th resistance is connected with the input of described 5th switching tube, and the output of described 5th switching tube is connected with described audio frequency R channel output.
9. audio noise as claimed in claim 8 eliminates circuit, and it is characterized in that, described second voltage pull-down circuits also comprises the 8th resistance, the 6th switching tube and the 3rd electric capacity; The first end of described 8th resistance is connected with the output of described drive circuit, second end of described 8th resistance is connected with the input of described 6th switching tube, the output of described 6th switching tube is connected with described audio frequency R channel output, the first end of described 3rd electric capacity is connected with described audio frequency R channel output, the second end ground connection of described 3rd electric capacity.
10. an audio-visual equipment, is characterized in that, the audio noise that described audio-visual equipment comprises as described in claim 1-9 any one eliminates circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521019093.9U CN205232334U (en) | 2015-12-09 | 2015-12-09 | Audio frequency noise suicide circuit and audio -visual equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521019093.9U CN205232334U (en) | 2015-12-09 | 2015-12-09 | Audio frequency noise suicide circuit and audio -visual equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205232334U true CN205232334U (en) | 2016-05-11 |
Family
ID=55907373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521019093.9U Active CN205232334U (en) | 2015-12-09 | 2015-12-09 | Audio frequency noise suicide circuit and audio -visual equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205232334U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108200518A (en) * | 2018-03-07 | 2018-06-22 | 合肥惠科金扬科技有限公司 | A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise |
-
2015
- 2015-12-09 CN CN201521019093.9U patent/CN205232334U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108200518A (en) * | 2018-03-07 | 2018-06-22 | 合肥惠科金扬科技有限公司 | A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise |
| CN108200518B (en) * | 2018-03-07 | 2024-04-12 | 合肥惠科金扬科技有限公司 | Audio circuit and audio equipment for eliminating instant noise during power-on |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203537555U (en) | Audio device | |
| CN102769729B (en) | Television and audio external play control circuit thereof | |
| CN103297894A (en) | Earphone power amplifier, working method and mobile terminal equipment | |
| CN101527801A (en) | Circuit for mixture output of TV receiver and speaker | |
| CN103929695B (en) | Household mosaic Bluetooth music play system and player method | |
| CN205081950U (en) | Audio signal input mode switching circuit and stereo set of stereo set | |
| CN201039105Y (en) | Silence control circuit | |
| CN201315646Y (en) | Digital audio interface circuit for TV | |
| CN205232334U (en) | Audio frequency noise suicide circuit and audio -visual equipment | |
| CN203407000U (en) | Voice output adjustment circuit and audio and video playing equipment | |
| CN106170114A (en) | Control method, device and the audio-frequence player device of a kind of audio frequency output | |
| CN207475793U (en) | It is a kind of can free switching audio output headset plug | |
| CN202395884U (en) | Television sound signal modulation circuit and television | |
| CN106792358B (en) | Audio control system and audio system | |
| CN202043081U (en) | Gain adjustable amplifying circuit | |
| CN200976669Y (en) | Earphone output circuit and television set having the same | |
| CN203734823U (en) | Audio device | |
| CN201533288U (en) | On-off mute circuit and digital television receiver with same | |
| CN206993381U (en) | A kind of Bluetooth audio device with NFC function | |
| CN201252517Y (en) | Noise suppression circuit and electron device with magnified audio power | |
| CN203136138U (en) | Audio signal input converting circuit and audio player | |
| CN218941317U (en) | Signal on-off circuit between power amplifier and loudspeaker | |
| CN203167212U (en) | Earphone output circuit and TV set | |
| CN109254753B (en) | Audio signal interface circuit and device, control method and playing equipment thereof | |
| CN215072952U (en) | AUX input circuit and audio playing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |