CN204131617U - TV and audio transmission circuit thereof - Google Patents
TV and audio transmission circuit thereof Download PDFInfo
- Publication number
- CN204131617U CN204131617U CN201420568438.5U CN201420568438U CN204131617U CN 204131617 U CN204131617 U CN 204131617U CN 201420568438 U CN201420568438 U CN 201420568438U CN 204131617 U CN204131617 U CN 204131617U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- output
- signal
- input
- 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 a kind of audio transmission circuit of TV, the audio transmission circuit of this TV comprises sound effect processing circuit, analogue audio frequency input interface, signal selecting circuit, controller and loud speaker, the first input end of analogue audio frequency input interface connection signal selection circuit and the first output of sound effect processing circuit, the output of signal selecting circuit connects the input of sound effect processing circuit, second output of sound effect processing circuit is connected to loud speaker, the controlled end of the control signal end connection signal selection circuit of controller.The invention also discloses a kind of TV.TV of the present utility model and audio transmission circuit thereof, making TV without the need to supporting audio return function, also television audio signals can be outputted to external subwoofer and playing, and the acoustical quality exported with the audio frequency promoting TV, can reduce the production cost of TV.
Description
Technical field
The utility model relates to field of television, particularly relates to TV and audio transmission circuit thereof.
Background technology
Along with the develop rapidly of science and technology, television set, in continuous update, has entered the HDTV (High-Definition Television) epoch, and the audio-video signal of TV adopts HDMI to transmit.Although TV can bring the visual enjoyment of high definition, the acoustical quality that the loud speaker that TV carries plays out is but very common, therefore, TV usually all supporting connection audio amplifier to promote the acoustical quality of TV.
With reference to figure 1, existing TV is the HDMI 80 by sound effect processor 60, the audio signal after process being connected external subwoofer by the HDMI 70 of TV, carries out broadcasting to promote acoustical quality with output audio signal to audio amplifier.This TV needs to support HDMI audio return function (namely by the ARC pin transmission of audio signal of HDMI), could export the audio frequency of TV to audio amplifier and play; But, support that the production cost of the TV of HDMI audio return function is high, but do not support the TV of HDMI audio return function, the acoustical quality playing to promote TV output can not be carried out to external subwoofer by output audio again; Current TV has an analogue audio frequency input interface usually, and this interface is only for receiving the input of external analog audio signal, function singleness.
Utility model content
Main purpose of the present utility model is that solution never supports that the TV of HDMI audio return function can not the technical problem of acoustical quality that exports to promote TV of external speaker.
For achieving the above object, the utility model provides a kind of audio transmission circuit of TV, it is characterized in that, described audio transmission circuit comprises sound effect processing circuit, analogue audio frequency input interface, signal selecting circuit, controller and loud speaker, described analogue audio frequency input interface connects the first input end of described signal selecting circuit and the first output of described sound effect processing circuit, the output of described signal selecting circuit connects the input of described sound effect processing circuit, second output of described sound effect processing circuit is connected to described loud speaker, the control signal end of described controller connects the controlled end of described signal selecting circuit,
When the control signal end of described controller exports the first level signal, described signal selecting circuit exports the audio signal extremely described sound effect processing circuit that its first input end receives, first output of described sound effect processing circuit disconnects and exporting, and described sound effect processing circuit exports described loud speaker by after the sound signal process received to from its second output; When the control signal end of described controller exports second electrical level signal, first input end and its output of described signal selecting circuit disconnect, described signal selecting circuit exports the signal extremely described sound effect processing circuit that its second input receives, described sound effect processing circuit, by after the Audio Signal Processing that receives, exports described analogue audio frequency input interface to from its first output and exports.
Preferably, described sound effect processing circuit comprises power amplifier, discharge circuit and analog to digital converter, the output of described signal selecting circuit is connected through the input of described analog to digital converter with described power amplifier, first output of described power amplifier connects described analogue audio frequency input interface through described discharge circuit, and the second output of described power amplifier connects described loud speaker.
Preferably, described discharge circuit comprises reference power circuit, the first signal amplification circuit and secondary signal amplifying circuit; Reference voltage input and the reference voltage input of described secondary signal amplifying circuit of described first signal amplification circuit are connected the reference voltage output end of described reference power circuit respectively; The signal input part of described first signal amplification circuit connects the L channel output of the first output of described power amplifier, and the signal output part of described first signal amplification circuit connects the L channel input of described simulated audio signal interface; The signal input part of described secondary signal amplifying circuit connects the R channel output of the first output of described power amplifier, and the signal output part of described secondary signal amplifying circuit connects the R channel input of described simulated audio signal interface.
Preferably, described reference power circuit comprises the first resistance, the second resistance and the first electric capacity, wherein,
Described first resistance one end connects DC power supply, and the other end of described first resistance is through described second grounding through resistance; Described first Capacitance parallel connection is at the two ends of described second resistance, and the other end of described first resistance is the reference voltage output end of described reference power circuit.
Preferably, described first signal amplification circuit comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and the first operational amplifier, wherein
The negative signal end of the L channel output of described first output is connected the inverting input of described first operational amplifier successively through described 3rd resistance, the second electric capacity and the 4th resistance, the inverting input of described first operational amplifier also connects the output of described first operational amplifier through described 7th resistance, described 4th Capacitance parallel connection is at the two ends of described 7th resistance, one end of described 9th resistance is connected between described 3rd resistance and the second electric capacity, the other end ground connection of described 9th resistance;
The positive signal end of the L channel output of described first output is connected the in-phase input end of described first operational amplifier successively through described 5th resistance, the 3rd electric capacity and the 6th resistance, the in-phase input end of described first operational amplifier also connects the reference voltage input of described first operational amplifier through described 8th resistance, described 5th Capacitance parallel connection is at the two ends of described 8th resistance; One end of described tenth resistance is connected between described 5th resistance and the 3rd electric capacity, the other end ground connection of described tenth resistance;
The output of described first operational amplifier connects the L channel input of described digital to analog converter through described 6th electric capacity.
Preferably, described secondary signal amplifying circuit comprises the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity and the second operational amplifier, wherein
The negative signal end of the R channel output of described first output is connected the inverting input of described second operational amplifier successively with the 12 resistance through described 11 resistance, the 7th electric capacity, the inverting input of described second operational amplifier also connects the output of described second operational amplifier through described 15 resistance, described 9th Capacitance parallel connection is at the two ends of described 15 resistance, one end of described 17 resistance is connected between described 11 resistance and the 7th electric capacity, the other end ground connection of described 17 resistance;
The positive signal end of the R channel output of described first output is connected the in-phase input end of described second operational amplifier successively with the 14 resistance through described 13 resistance, the 8th electric capacity, the in-phase input end of described second operational amplifier also connects the reference voltage input of described second operational amplifier through described 16 resistance, described tenth Capacitance parallel connection is at the two ends of described 16 resistance; One end of described 18 resistance is connected between described 13 resistance and the 8th electric capacity, the other end ground connection of described 18 resistance;
The output of described second operational amplifier connects the R channel input of described digital to analog converter through described 11 electric capacity.
Preferably, described signal selecting circuit is 74HC4052 integrated circuit, tenth pin of described 74HC4052 integrated circuit is as the controlled end of described signal selecting circuit, 9th pin ground connection of described 74HC4052 integrated circuit, described first level signal is low level, and described second electrical level signal is high level, 12 pin of described 74HC4052 integrated circuit is as the L channel input of the first input end of described signal selecting circuit, first pin of described 74HC4052 integrated circuit is as the R channel input of the first input end of described signal selecting circuit, 14 pin of described 74HC4052 integrated circuit is as the L channel input of the second input of described signal selecting circuit, 5th pin of described 74HC4052 integrated circuit is as the R channel input of the second input of described signal selecting circuit, 13 pin of described 74HC4052 integrated circuit is as the L channel output of the output of described signal selecting circuit, 3rd pin of described 74HC4052 integrated circuit is as the R channel output of the output of described signal selecting circuit.
In addition, for achieving the above object, the utility model also provides a kind of TV, and described TV comprises the audio transmission circuit of TV as above.
TV of the present utility model and audio transmission circuit thereof, by improving on the circuit of the analogue audio frequency input interface of TV, when making TV not receive external audio signal by analogue audio frequency input interface, the audio output interface use of analogue audio frequency input interface as TV is play to external voice box with output audio signal, realize the audio frequency acoustical quality promoting TV, make not support that the TV of HDMI audio return function also can realize external speaker to promote acoustical quality, and just the circuit of the analogue audio frequency input interface that TV carries is improved, without the need to newly-increased interface, compared to the TV of integrated HDMI audio return function, use the cost of the TV of the utility model audio transmission circuit lower.
Accompanying drawing explanation
Fig. 1 is the hardware module connection diagram of the audio transmission of existing HDTV (High-Definition Television);
Fig. 2 is the hardware module schematic diagram of the audio transmission circuit preferred embodiment of the utility model TV;
Fig. 3 is the hardware module refinement schematic diagram of the audio transmission circuit preferred embodiment of the utility model TV;
Fig. 4 is the further refinement schematic diagram of hardware module of the utility model audio transmission circuit preferred embodiment;
Fig. 5 is the part pin schematic diagram of preferred 74HC4052 in the preferred embodiment of the utility model audio transmission circuit;
Fig. 6 is the circuit diagram of reference power circuit in the preferred embodiment of the utility model audio transmission circuit;
Fig. 7 is the circuit diagram of the first signal amplification circuit in the preferred embodiment of the utility model audio transmission circuit;
Fig. 8 is the circuit diagram of secondary signal amplifying circuit in the preferred embodiment of the utility model audio transmission circuit.
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
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.
The utility model provides a kind of audio transmission circuit of TV, with reference to Fig. 2, in the present embodiment, this audio transmission circuit comprises sound effect processing circuit 10, analogue audio frequency input interface 20, signal selecting circuit 30, controller 40 and loud speaker 50, the first input end 31 of analogue audio frequency input interface 20 connection signal selection circuit 30 and the first output of sound effect processing circuit 10, the output of signal selecting circuit 30 connects the input of sound effect processing circuit 10, second output of sound effect processing circuit 10 is connected to loud speaker 50, the controlled end of the control signal end connection signal selection circuit 30 of controller 40, when the control signal end of controller 40 exports the first level signal, signal selecting circuit 30 exports audio signal that its first input end 31 receives to sound effect processing circuit 10, first output of sound effect processing circuit 10 disconnects and exporting, and sound effect processing circuit 10 exports loud speaker 50 by after the sound signal process received to from its second output, when the control signal end of controller 40 exports second electrical level signal, first input end 31 and its output of signal selecting circuit 30 disconnect, signal selecting circuit 30 exports signal that its second input 32 receives to sound effect processing circuit 10, sound effect processing circuit 10, by after the Audio Signal Processing that receives, exports analogue audio frequency input interface 20 to from its first output and exports.
Concrete, in the present embodiment, the audio transmission circuit of TV has two kinds of mode of operations.Pattern one, simulated audio signal interface external audio signal input pattern: controller 40 exports the first level signal to signal selecting circuit 30, signal selecting circuit 30 is made to select its first input end 31 and its output conducting, its second input 32 disconnects with output, thus signal selecting circuit 30 exports the audio signal (namely from the external audio signal of simulated audio signal interface input) that its first input end 31 receives, the audio signal that sound effect processing circuit 10 Received signal strength selection circuit 30 exports processes, because the simulated audio signal interface under this pattern has signal to input, first output of the sound effect processing circuit 10 therefore under this pattern disconnects and exporting, sound effect processing circuit 10 exports audio signal after process to loud speaker 50 from its second output and plays.Pattern two, simulated audio signal interface output audio signal is to external played equipment (for external subwoofer in the present embodiment) play mode: controller 40 exports second electrical level signal to signal selecting circuit 30, signal selecting circuit 30 is made to select its second input 32 and its output conducting, its first input end 31 disconnects with output, signal selecting circuit 30 exports audio signal that its second input 32 receives (such as, the audio frequency of TV programme, audio frequency received by bluetooth or WIFI wave point etc.), the audio signal received processes by sound effect processing circuit 10, due to this pattern Imitating audio signal interface absence of audio input (leaving unused), therefore, first output of sound effect processing circuit 10 and simulated audio signal orifice, audio signal after process is outputted to simulated audio signal interface and exports by sound effect processing circuit 10, simulated audio signal interface connects external subwoofer, namely realize TV output audio signal and carry out broadcasting output to external subwoofer, improve the acoustical quality of televising and exporting, certainly, now the second output of sound effect processing circuit 10 also the audio signal after output processing can be play to loud speaker 50 and exports.
The audio transmission circuit of the present embodiment, by improving on the circuit of the analogue audio frequency input interface 20 of TV, when making TV not receive external audio signal by analogue audio frequency input interface 20, the audio output interface use of analogue audio frequency input interface 20 as TV is play to external voice box with output audio signal, realize the audio frequency acoustical quality promoting TV, make not support that the TV of HDMI audio return function also can realize external speaker to promote acoustical quality, and just the circuit of the analogue audio frequency input interface 20 that TV carries is improved, without the need to newly-increased interface, compared to the TV of integrated HDMI audio return function, use the cost of the TV of the present embodiment audio transmission circuit lower.
Further, with reference to Fig. 3, in the present embodiment, sound effect processing circuit 10 comprises power amplifier 12, discharge circuit 13 and analog to digital converter 11, the output of described signal selecting circuit 30 is connected through the input of described analog to digital converter 11 with described power amplifier 12, first output of described power amplifier 12 connects described analogue audio frequency input interface 20 through described discharge circuit 13, and the second output of described power amplifier 12 connects described loud speaker 50.Analog to digital converter 11 outputs to power amplifier 12 after the signal that signal selecting circuit 30 exports is converted to digital signal, power amplifier 12 carries out power amplification by the digital audio and video signals received, audio signal after amplifying is outputted to discharge circuit 13 to amplify further from power amplifier 12 first output, further lifting outputs to the audio signal quality of external subwoofer from analog input interface, thus the acoustical quality that external subwoofer is played back is better; Directly export loud speaker 50 to from the audio signal of power amplifier 12 second output output to play.
Concrete, with reference to Fig. 4, the amplifier module of the present embodiment comprises reference power circuit 131, first signal amplification circuit 132 and secondary signal amplifying circuit 133; The reference voltage input REFin of the first signal amplification circuit 132 is connected the reference voltage output end REFout of reference power circuit 131 respectively with the reference voltage input REFin of secondary signal amplifying circuit 133; The signal input part of the first signal amplification circuit 132 connects the L channel output Lout of the first output of power amplifier 12, the L channel input L of the signal output part connecting analog audio input interface 20 of the first signal amplification circuit 132; The signal input part of secondary signal amplifying circuit 133 connects the R channel output Rout of the first output of power amplifier 12, the R channel input R of the signal output part connecting analog audio input interface 20 of secondary signal amplifying circuit 133.
Concrete, with reference to Fig. 6, reference power circuit 131 comprises the first resistance R1, the second resistance R2 and the first electric capacity C1, and wherein, first resistance R1 one end connects DC power supply, and the other end of the first resistance R1 is through the second resistance R2 ground connection; First electric capacity C1 is connected in parallel on the two ends of the second resistance R2, and the other end of the first resistance R1 is the reference voltage output end REFout of reference power circuit 131.
Concrete, in conjunction with reference Fig. 6 and Fig. 7, first signal amplification circuit 132 comprises the 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, 6th electric capacity C6 and the first operational amplifier U1, wherein, the negative signal end Lout-of the L channel output Lout of the first output is successively through the 3rd resistance R3, second electric capacity C2 is connected the inverting input 1 of the first operational amplifier U1 with the 4th resistance R4, the inverting input 1 of the first operational amplifier U1 also connects the output of the first operational amplifier U1 through the 7th resistance R7, 4th electric capacity C4 is connected in parallel on the two ends of the 7th resistance R7, one end of 9th resistance R9 is connected between the 3rd resistance R3 and the second electric capacity C2, the other end ground connection of the 9th resistance R9, the positive signal end Lout+ of the L channel output Lout of the first output is connected the in-phase input end 2 of the first operational amplifier U1 successively with the 6th resistance R6 through the 5th resistance R5, the 3rd electric capacity C3, the in-phase input end 2 of the first operational amplifier U1 also connects the reference voltage input REFin of the first operational amplifier U1 through the 8th resistance R8, the 5th electric capacity C5 is connected in parallel on the two ends of the 8th resistance R8, one end of tenth resistance R10 is connected between the 5th resistance R5 and the 3rd electric capacity C3, the other end ground connection of the tenth resistance R10, the output 3 of the first operational amplifier U1 is through the L channel input L of the 6th electric capacity C6 connecting analog audio input interface 20.Reference voltage output end REFout in reference voltage input REFin and Fig. 6 in Fig. 7 connects.
Concrete, in conjunction with reference Fig. 6 and Fig. 8, secondary signal amplifying circuit 133 comprises the 11 resistance R11, 12 resistance R12, 13 resistance R13, 14 resistance R14, 15 resistance R15, 16 resistance R16, 17 resistance R17, 18 resistance R18, 7th electric capacity C7, 8th electric capacity C8, 9th electric capacity C9, tenth electric capacity C10, 11 electric capacity C11 and the second operational amplifier U2, wherein, the negative signal end Rout-of the R channel output Rout of the first output is successively through the 11 resistance R11, 7th electric capacity C7 is connected the inverting input 4 of the second operational amplifier U2 with the 12 resistance R12, the inverting input 4 of the second operational amplifier U2 also connects the output of the second operational amplifier U2 through the 15 resistance R15, 9th electric capacity C9 is connected in parallel on the two ends of the 15 resistance R15, one end of 17 resistance R17 is connected between the 11 resistance R11 and the 7th electric capacity C7, the other end ground connection of the 17 resistance R17, the positive signal end Rout+ of the R channel output Rout of the first output is connected the in-phase input end 5 of the second operational amplifier U2 successively with the 14 resistance R14 through the 13 resistance R13, the 8th electric capacity C8, the in-phase input end 5 of the second operational amplifier U2 also connects the reference voltage input REFin of the second operational amplifier U2 through the 16 resistance R16, the tenth electric capacity C10 is connected in parallel on the two ends of the 16 resistance R16, one end of 18 resistance R18 is connected between the 13 resistance R13 and the 8th electric capacity C8, the other end ground connection of the 18 resistance R18, the output 6 of the second operational amplifier U2 is through the R channel input R of the 11 electric capacity C11 connecting analog audio input interface 20.Reference voltage output end REFout in reference voltage input REFin and Fig. 6 in Fig. 8 connects.
Concrete, in the present embodiment, preferred signals selection circuit 30 is described for 74HC40 integrated circuit (selection chip), with reference to Fig. 5, tenth pin A of 74HC40 integrated circuit is as the controlled end of signal selecting circuit 30,9th pin B ground connection of 74HC40 integrated circuit, first level signal is low level, and second electrical level signal is high level, 12 pin X0 of 74HC40 integrated circuit is as the L channel input of the first input end 31 of signal selecting circuit 30, first pin Y0 of 74HC40 integrated circuit is as the R channel input of the first input end 31 of signal selecting circuit 30, 14 pin X1 of 74HC40 integrated circuit is as the L channel input of the second input 32 of signal selecting circuit 30, 5th pin Y1 of 74HC40 integrated circuit is as the R channel input of the second input 32 of signal selecting circuit 30, 13 pin X of 74HC40 integrated circuit is as the L channel output of the output of signal selecting circuit 30, 3rd pin Y of 74HC40 integrated circuit is as the R channel output of the output of signal selecting circuit 30.
The utility model also provides a kind of TV, and this TV comprises audio transmission circuit, and this audio transmission circuit can comprise the technical scheme in above-mentioned any embodiment, and its detailed construction can refer to Fig. 2-Fig. 8, does not repeat at this.Owing to have employed the scheme of aforementioned audio transmission circuit, the utility model TV is compared to existing TV, without the need to supporting audio return function, also television audio signals can be outputted to external subwoofer to play, with the acoustical quality that the audio frequency promoting TV exports, the production cost of TV can be reduced.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (8)
1. the audio transmission circuit of a TV, it is characterized in that, described audio transmission circuit comprises sound effect processing circuit, analogue audio frequency input interface, signal selecting circuit, controller and loud speaker, described analogue audio frequency input interface connects the first input end of described signal selecting circuit and the first output of described sound effect processing circuit, the output of described signal selecting circuit connects the input of described sound effect processing circuit, second output of described sound effect processing circuit is connected to described loud speaker, the control signal end of described controller connects the controlled end of described signal selecting circuit,
When the control signal end of described controller exports the first level signal, described signal selecting circuit exports the audio signal extremely described sound effect processing circuit that its first input end receives, first output of described sound effect processing circuit disconnects and exporting, and described sound effect processing circuit exports described loud speaker by after the sound signal process received to from its second output; When the control signal end of described controller exports second electrical level signal, first input end and its output of described signal selecting circuit disconnect, described signal selecting circuit exports the signal extremely described sound effect processing circuit that its second input receives, described sound effect processing circuit, by after the Audio Signal Processing that receives, exports described analogue audio frequency input interface to from its first output and exports.
2. the audio transmission circuit of TV as claimed in claim 1, it is characterized in that, described sound effect processing circuit comprises power amplifier, discharge circuit and analog to digital converter, the output of described signal selecting circuit is connected through the input of described analog to digital converter with described power amplifier, first output of described power amplifier connects described analogue audio frequency input interface through described discharge circuit, and the second output of described power amplifier connects described loud speaker.
3. the audio transmission circuit of TV according to claim 2, is characterized in that, described discharge circuit comprises reference power circuit, the first signal amplification circuit and secondary signal amplifying circuit; Reference voltage input and the reference voltage input of described secondary signal amplifying circuit of described first signal amplification circuit are connected the reference voltage output end of described reference power circuit respectively; The signal input part of described first signal amplification circuit connects the L channel output of the first output of described power amplifier, and the signal output part of described first signal amplification circuit connects the L channel input of described simulated audio signal interface; The signal input part of described secondary signal amplifying circuit connects the R channel output of the first output of described power amplifier, and the signal output part of described secondary signal amplifying circuit connects the R channel input of described simulated audio signal interface.
4. the audio transmission circuit of TV according to claim 3, is characterized in that, described reference power circuit comprises the first resistance, the second resistance and the first electric capacity, wherein,
Described first resistance one end connects DC power supply, and the other end of described first resistance is through described second grounding through resistance; Described first Capacitance parallel connection is at the two ends of described second resistance, and the other end of described first resistance is the reference voltage output end of described reference power circuit.
5. the audio transmission circuit of TV according to claim 4, it is characterized in that, described first signal amplification circuit comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and the first operational amplifier, wherein
The negative signal end of the L channel output of described first output is connected the inverting input of described first operational amplifier successively through described 3rd resistance, the second electric capacity and the 4th resistance, the inverting input of described first operational amplifier also connects the output of described first operational amplifier through described 7th resistance, described 4th Capacitance parallel connection is at the two ends of described 7th resistance, one end of described 9th resistance is connected between described 3rd resistance and the second electric capacity, the other end ground connection of described 9th resistance;
The positive signal end of the L channel output of described first output is connected the in-phase input end of described first operational amplifier successively through described 5th resistance, the 3rd electric capacity and the 6th resistance, the in-phase input end of described first operational amplifier also connects the reference voltage input of described first operational amplifier through described 8th resistance, described 5th Capacitance parallel connection is at the two ends of described 8th resistance; One end of described tenth resistance is connected between described 5th resistance and the 3rd electric capacity, the other end ground connection of described tenth resistance;
The output of described first operational amplifier connects the L channel input of described digital to analog converter through described 6th electric capacity.
6. the audio transmission circuit of TV according to claim 4, it is characterized in that, described secondary signal amplifying circuit comprises the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance, the 18 resistance, the 7th electric capacity, the 8th electric capacity, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity and the second operational amplifier, wherein
The negative signal end of the R channel output of described first output is connected the inverting input of described second operational amplifier successively with the 12 resistance through described 11 resistance, the 7th electric capacity, the inverting input of described second operational amplifier also connects the output of described second operational amplifier through described 15 resistance, described 9th Capacitance parallel connection is at the two ends of described 15 resistance, one end of described 17 resistance is connected between described 11 resistance and the 7th electric capacity, the other end ground connection of described 17 resistance;
The positive signal end of the R channel output of described first output is connected the in-phase input end of described second operational amplifier successively with the 14 resistance through described 13 resistance, the 8th electric capacity, the in-phase input end of described second operational amplifier also connects the reference voltage input of described second operational amplifier through described 16 resistance, described tenth Capacitance parallel connection is at the two ends of described 16 resistance; One end of described 18 resistance is connected between described 13 resistance and the 8th electric capacity, the other end ground connection of described 18 resistance;
The output of described second operational amplifier connects the R channel input of described digital to analog converter through described 11 electric capacity.
7. the audio transmission circuit of the TV according to any one of claim 1-6, it is characterized in that, described signal selecting circuit is 74HC4052 integrated circuit, tenth pin of described 74HC4052 integrated circuit is as the controlled end of described signal selecting circuit, 9th pin ground connection of described 74HC4052 integrated circuit, described first level signal is low level, and described second electrical level signal is high level, 12 pin of described 74HC4052 integrated circuit is as the L channel input of the first input end of described signal selecting circuit, first pin of described 74HC4052 integrated circuit is as the R channel input of the first input end of described signal selecting circuit, 14 pin of described 74HC4052 integrated circuit is as the L channel input of the second input of described signal selecting circuit, 5th pin of described 74HC4052 integrated circuit is as the R channel input of the second input of described signal selecting circuit, 13 pin of described 74HC4052 integrated circuit is as the L channel output of the output of described signal selecting circuit, 3rd pin of described 74HC4052 integrated circuit is as the R channel output of the output of described signal selecting circuit.
8. a TV, is characterized in that, described TV comprises audio transmission circuit according to any one of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420568438.5U CN204131617U (en) | 2014-09-29 | 2014-09-29 | TV and audio transmission circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420568438.5U CN204131617U (en) | 2014-09-29 | 2014-09-29 | TV and audio transmission circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131617U true CN204131617U (en) | 2015-01-28 |
Family
ID=52387931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420568438.5U Active CN204131617U (en) | 2014-09-29 | 2014-09-29 | TV and audio transmission circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131617U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796764A (en) * | 2015-04-17 | 2015-07-22 | 深圳市东明炬创电子有限公司 | Home audio-visual interconnection system |
-
2014
- 2014-09-29 CN CN201420568438.5U patent/CN204131617U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796764A (en) * | 2015-04-17 | 2015-07-22 | 深圳市东明炬创电子有限公司 | Home audio-visual interconnection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206908729U (en) | A kind of TYPE C turn the signal conversion line of DP interfaces | |
| CN209861146U (en) | Wireless audio conversion device and wireless sound system | |
| CN104620589A (en) | Acoustic processing device | |
| CN204131617U (en) | TV and audio transmission circuit thereof | |
| CN203407000U (en) | Voice output adjustment circuit and audio and video playing equipment | |
| CN205540057U (en) | One -to -many audio frequency control system based on radio transmission technology | |
| CN105100999A (en) | Dual impedance earphone | |
| CN206759400U (en) | High-frequency power amplifying circuit for multiple wireless frequency modulation broadcasting | |
| CN205657827U (en) | Intelligent high integration active audio amplifier | |
| CN201601737U (en) | Video amplifying circuit | |
| CN203596863U (en) | Circuit and television reusing audio input and output terminals | |
| CN204498351U (en) | A kind of television set with Wireless microphone receiver | |
| CN201937750U (en) | Audio channel switching circuit of digital television all-in-one machine and digital television all-in-one machine | |
| CN205657832U (en) | Family's sound system based on radio communication | |
| CN201629802U (en) | Built-in radio-frequency antenna circuit, radio-frequency transmitting antenna and television | |
| CN201252517Y (en) | Noise suppression circuit and electron device with magnified audio power | |
| CN201114497Y (en) | Audio and video signal automatic multi-optional device | |
| CN201290133Y (en) | Multimedia play system and multimedia interface base frame | |
| CN205039780U (en) | Take dual power supply's dual track audio power amplifier circuit | |
| CN204013933U (en) | A kind of TV set-top box with audio amplifier | |
| CN204498239U (en) | A kind of television set with wireless audio transmitter | |
| CN205029848U (en) | Take sound console of wireless audio frequency transmitter | |
| CN202818578U (en) | Special active loudspeaker having noise reduction function for reception | |
| CN210202051U (en) | Microphone mute circuit and system for eliminating puff sound of earphone | |
| CN207884798U (en) | A kind of radio-frequency interface circuit of cable digital TV set-top box circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 516006 Guangdong province Huizhou Zhongkai hi tech Development Zone No. 19 district Patentee after: TCL Kone Electronics (Huizhou) Ltd. Address before: Zhongkai High-tech Development Zone in Shenzhen City, Guangdong province 516006 District No. 19 Patentee before: TCL Kone Electronics (Huizhou) Ltd. |