CN2730051Y - Output circuit for implementing main picture and subpicture sound switchover by single earphone - Google Patents
Output circuit for implementing main picture and subpicture sound switchover by single earphone Download PDFInfo
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- CN2730051Y CN2730051Y CN 200420096787 CN200420096787U CN2730051Y CN 2730051 Y CN2730051 Y CN 2730051Y CN 200420096787 CN200420096787 CN 200420096787 CN 200420096787 U CN200420096787 U CN 200420096787U CN 2730051 Y CN2730051 Y CN 2730051Y
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Abstract
The utility model discloses an output circuit for implementing main picture and subpicture sound switchover by single earphone, mainly comprising an instruction signal detection circuit, a sound signal switching circuit, a power signal amplifier and an earphone socket. Wherein, the instruction signal detection circuit detects real-time the instruction signal generated by the user, further controls the sound signal switching circuit to output in selection the aural signal of the main picture and the subpicture, so the switchover output of the aural signal of the main picture and the subpicture is implemented by single earphone, reducing greatly the production cost. In addition, by the silence function of the remote controller, the sound signal of the main picture is output directly by the earphone, and the switchover output of the earphone and the loudspeaker are implemented with not using switchover switch, greatly reinforcing the stability of the earphone socket.
Description
Technical Field
The utility model relates to a TV set circuit, specifically speaking relates to a processing circuit that TV set sound accompanies and switches.
Background
At present, in a general television circuit, two earphone sockets are usually provided to output audio signals of a main picture and a sub-picture of the television respectively. The earphone socket is internally provided with a change-over switch, when the earphone is inserted into the main picture earphone socket, the change-over switch automatically cuts off the accompanying sound output of the loudspeaker, and the main picture accompanying sound is normally output through the earphone. At this time, if the sound volume is large, the switch may be blown by a large output current, thereby increasing instability of the headphone jack. Also, the use of one earphone for each of the main picture and the sub picture increases the manufacturing cost.
Disclosure of Invention
The utility model discloses a solve the accompanying sound signal of main picture and sprite among the prior art and pass through two earphone outputs respectively to the change over switch that adopts the earphone to take realizes the switching output of main picture accompanying sound signal, thereby the manufacturing cost who brings is high, earphone socket is unstable not enough, a novel accompanying sound switching treatment circuit is provided, it has realized the switching output of main picture and sprite accompanying sound signal through single earphone, and the cost is reduced has strengthened earphone socket's stability.
In order to solve the technical problem, the utility model discloses an adopt following technical scheme to realize:
a circuit for realizing the switching output of main picture and sub-picture accompanying sound by a single earphone comprises a power signal amplifier, an earphone jack, an instruction signal detection circuit and an accompanying sound signal switching circuit; the said instruction signal detection circuit judges the instruction signal sent by the user, and converts it into control signal and outputs it to the said accompanying sound signal switching circuit; the sound signal switching circuit outputs the picture sound selected by the user to the power signal amplifier for power amplification under the control of the control signal, and then outputs the picture sound through the earphone jack.
The sound signal switching circuit is realized by adopting a signal switching chip, the input end of the sound signal switching circuit respectively receives left and right sound channel signals of a main picture and a sub picture, the control end receives a control signal output by the instruction signal detection circuit, under the control action of the control end, the sound signal of the selected picture is output to the input end of the power signal amplifier after being subjected to resistance-capacitance filtering through the output end, the sound signal is output to the earphone jack through the output end after being subjected to power amplification, and then the sound signal of the picture is output.
The instruction signal detection circuit is realized by adopting a triode, the base of the triode receives an instruction signal, one path of the collector is connected with a power supply through a resistor, the other path of the collector is connected with the control end of the accompanying sound signal switching circuit, and the emitter of the accompanying sound signal switching circuit is grounded. The instruction signal can be sent by a remote controller, and can also be realized by connecting a switch and a direct current power supply in series at the base of the triode.
The sound signal switching circuit is realized by adopting a signal switching chip with the model number of TC 4053; and the power signal amplifier is realized by a small-power signal amplifying chip with the model number of TDA7053 AT.
Compared with the prior art, the utility model discloses an advantage is with positive effect: the utility model discloses an adopt instruction signal detection circuitry to carry out real-time detection to the instruction signal that the user sent, and then control accompanying sound signal switching circuit and select the output to the accompanying sound signal of main picture and sprite to realized only needing to use single earphone can accomplish the switching output of main picture and sprite accompanying sound signal, greatly reduced manufacturing cost. In addition, the sound accompanying signals of the main picture are directly output through the earphone through the mute function of the remote controller, the switching output of the earphone and the loudspeaker can be realized without using a switch, and the stability of the earphone socket is greatly enhanced.
Drawings
Fig. 1 is a specific circuit connection diagram of the sound switching processing circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In fig. 1, the audio signal switching circuit is implemented by two signal switching chips of which the type is TC4053, the input terminals Y0 and Z0 of the switching chip TC4053 receive left and right sound channel signals of a sub-picture respectively, Y1 and Z1 receive left and right sound channel signals of a main picture respectively, the channel selection control terminal A, B, C of the switching chip is connected with the collector of a triode VA14, the collector of the triode VA14 is also connected with a +9V dc power supply through a resistor RA93, the base of the triode VA14 is connected with an instruction signal sent by a remote controller through the resistor RA87, and the emitter is grounded.
When the user selects to output the sub-picture accompanying sound through the remote controller, the remote controller sends a high level instruction signal to control the conduction of the triode VA14, so that the potential of the channel selection control end A, B, C is pulled low, and the control signal switching chip TC4053 outputs the sub-picture accompanying sound signal through the output ends QY and QZ of the sub-picture accompanying sound. The left channel audio signal of the sub-picture is outputted from the output terminal QY and is connected to the input terminal V12 of the low power signal amplification chip TDA7053AT through the resistor RA115 and the coupling capacitor CA135, while the right channel audio signal of the sub-picture is outputted from the output terminal QZ and is connected to the input terminal V11 of the low power signal amplification chip TDA7053AT through the resistor RA112 and the coupling capacitor CA 132. The small-power signal amplification chip TDA7053AT amplifies the power of the input audio signal, and outputs the amplified audio signal through an earphone jack after being filtered by the output terminals OUT1+ and OUT2+ of the amplified audio signal through the capacitor CA119, the resistor RA124, the capacitor CA126 and the resistor RA123, respectively. In addition, the VOLUME control signal VOLUME controls the VOLUME increase and decrease of the VC1 and VC2 terminals of the low power signal amplification chip TDA7053AT through the resistor RA 95. Similarly, when the user selects to output the main picture accompanying sound through the remote controller, the remote controller sends a low level instruction signal to control the triode VA14 to be cut off, so that the potential of the channel selection control end A, B, C is raised, and the control signal switching chip TC4053 outputs the accompanying sound signal of the main picture.
In addition, the base of the transistor VA14 can also be connected in series with a switch and a dc power supply through a resistor RA87 to realize the switching output of the main picture and sub-picture audio signals by the user. The specific operation process is as follows: when a user selects the sub-picture accompanying sound, the switch is closed, so that the base electrode of the triode VA14 is conducted under the action of the direct-current power supply, and the control signal switching chip TC4053 outputs the sub-picture accompanying sound signal; when the user selects the main picture accompanying sound, the switch is switched off, the base electrode of the triode VA14 is cut off, and therefore the signal switching chip TC4053 is controlled to output the main picture accompanying sound signal.
The utility model discloses an adopt above-mentioned circuit structure to realize the switching output of main picture and sprite sound signal, not only reduced manufacturing cost, strengthened earphone socket's stability moreover greatly.
Claims (8)
1. A circuit for realizing main picture and sub-picture accompanying sound switching output by a single earphone comprises a power signal amplifier and an earphone jack, and is characterized in that: the sound switching circuit comprises an instruction signal detection circuit and a sound signal switching circuit; wherein,
the instruction signal detection circuit judges an instruction signal sent by a user and converts the instruction signal into a control signal to be output;
the sound signal switching circuit outputs the picture sound selected by the user to the power signal amplifier for power amplification under the control of the control signal output by the instruction signal detection circuit, and then outputs the picture sound through the earphone jack.
2. The circuit for switching the output of main picture and sub-picture audio using a single earphone as claimed in claim 1, wherein: the sound signal switching circuit is realized by adopting a signal switching chip, the input end of the sound signal switching chip respectively receives left and right sound channel signals of a main picture and a sub picture, the control end of the sound signal switching chip receives a control signal output by the instruction signal detection circuit, and the output end of the sound signal switching chip is connected with the power signal amplifier.
3. The circuit for switching the output of main picture and sub-picture audio using a single earphone as claimed in claim 2, wherein: the output end of the accompanying sound signal switching circuit is connected with the input end of the power signal amplifier after resistance-capacitance filtering, and the output end of the power signal amplifier is connected with an earphone jack.
4. The circuit for switching the output of main picture and sub-picture audio using a single earphone as claimed in claim 1, wherein: the instruction signal detection circuit is realized by adopting a triode, the base of the triode receives an instruction signal, one path of the collector is connected with a power supply through a resistor, the other path of the collector is connected with the control end of the accompanying sound signal switching circuit, and the emitting electrode of the accompanying sound signal switching circuit is grounded.
5. The circuit of claim 4 for switching the output of main and sub-picture audio signals with a single earphone, wherein: and the base electrode of the triode receives an instruction signal sent by a remote controller.
6. The circuit of claim 4 for switching the output of main and sub-picture audio signals with a single earphone, wherein: the base electrode of the triode is connected with a direct current power supply through a switch.
7. A circuit for switching output of main picture and sub-picture audio with a single headphone according to claim 1, 2 or 3, wherein: the sound signal switching circuit is realized by adopting a signal switching chip with the model number of TC 4053.
8. The circuit for realizing switching output of main picture and sub-picture audio by using a single earphone as claimed in claim 1 or 3, wherein: the power signal amplifier is realized by a small-power signal amplification chip with the model number of TDA7053 AT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420096787 CN2730051Y (en) | 2004-09-30 | 2004-09-30 | Output circuit for implementing main picture and subpicture sound switchover by single earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420096787 CN2730051Y (en) | 2004-09-30 | 2004-09-30 | Output circuit for implementing main picture and subpicture sound switchover by single earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2730051Y true CN2730051Y (en) | 2005-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420096787 Expired - Fee Related CN2730051Y (en) | 2004-09-30 | 2004-09-30 | Output circuit for implementing main picture and subpicture sound switchover by single earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2730051Y (en) |
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2004
- 2004-09-30 CN CN 200420096787 patent/CN2730051Y/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
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| 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 |