CN214045982U - Flat-panel television and audio output control circuit - Google Patents
Flat-panel television and audio output control circuit Download PDFInfo
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- CN214045982U CN214045982U CN202022694874.5U CN202022694874U CN214045982U CN 214045982 U CN214045982 U CN 214045982U CN 202022694874 U CN202022694874 U CN 202022694874U CN 214045982 U CN214045982 U CN 214045982U
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Abstract
The utility model discloses a flat screen television and audio output control circuit, wherein, flat screen television's audio output control circuit is connected with flat screen television's mainboard and power amplifier respectively, and audio output control circuit includes: the switching module is connected with the switching module; the switch module is respectively connected with the mainboard and the switching module and is used for switching on or off according to a control signal output by the mainboard; the switching module is connected with the power amplifier and used for controlling the audio signal output by the power amplifier to be output through a corresponding audio output channel according to the connection or disconnection of the switch module. And further, the automatic switching of the audio output channels of the flat-panel television is realized, so that the flat-panel television can be matched with a soundbar sound box when the soundbar small plate is not designed, and the compatibility of the flat-panel television is improved.
Description
Technical Field
The utility model relates to an electronic equipment technical field, in particular to flat screen television and audio output control circuit.
Background
As flat-panel televisions are popularized and the thicknesses of the televisions are thinner and the frames are narrower and narrower with the leap development of the technology, although the thicknesses and the frames bring high-definition and ultrathin visual enjoyment to people, the frames are narrowed due to the thinning of the structure, so that the loudspeaker cavity of the flat-panel television is reduced, and the sound quality is lighter and thinner, so that soundbar sound boxes (strip sound boxes with a plurality of sound channels integrated in one box body) specially designed for making up the shortage of the sound quality of the flat-panel television are designed; each channel in the soundbar sound box is provided with an independent cavity, so that good isolation and separation degree are guaranteed, the soundbar sound box can be matched with a flat-panel television for use during use, the soundbar sound box is transversely placed for use according to the size design of the flat-panel television, and an integrated visual effect can be formed with the flat-panel television.
However, the conventional soundbar sound box is expensive, each television is not matched with the soundbar sound box, and the soundbar small plate is not designed in the corresponding television.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a flat screen television and audio output control circuit for flat screen television also can match the soundbar audio amplifier when not designing the soundbar platelet, improves flat screen television's compatibility.
In order to achieve the purpose, the utility model adopts the following technical proposal:
an audio output control circuit of a flat-panel television is respectively connected with a mainboard and a power amplifier of the flat-panel television, and comprises a switch module and a switching module; the switch module is respectively connected with the mainboard and the switching module and is used for switching on or off according to a control signal output by the mainboard; the switching module is connected with the power amplifier and used for controlling the audio signal output by the power amplifier to be output through a corresponding audio output channel according to the connection or disconnection of the switch module.
In the audio output control circuit, the switch module comprises a switch unit; the switch unit is connected with the mainboard and the switching module and is used for being switched on or off according to a control signal output by the mainboard.
In the audio output control circuit, the switch module further comprises a feedback unit and a pull-up unit; the feedback unit is respectively connected with the pull-up unit and the switch unit and is used for outputting a feedback signal to the switch unit when the flat-panel television is connected with an external sound box; the pull-up unit is used for pulling up the feedback signal into a high-level signal; the switch unit is used for conducting according to the feedback signal.
In the audio output control circuit, the switch unit comprises a switch tube, a first resistor and a second resistor; the first end of the switch tube is connected with one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected with the mainboard, the pull-up unit and the feedback unit respectively, the other end of the second resistor is grounded with the second end of the switch tube, and the third end of the switch tube is connected with the switching module.
In the audio output control circuit, the feedback unit comprises a third resistor, one end of the third resistor is connected with the feedback signal input end, and the other end of the third resistor is connected with the other end of the first resistor and the pull-up unit.
In the audio output control circuit, the pull-up unit comprises a fourth resistor, one end of the fourth resistor is connected with the other end of the third resistor and the other end of the first resistor, and the other end of the fourth resistor is connected with the power supply.
In the audio output control circuit, the switching module comprises a double-pole double-throw switch, a fifth resistor, a capacitor and a diode; a 1 st pin of the double-pole double-throw switch is respectively connected with one end of a fifth resistor and the anode of a diode, the other end of the fifth resistor is connected with a third end of the switch tube, an 8 th pin of the double-pole double-throw switch, the anode of the diode and one end of the capacitor are all connected with electricity, and the other end of the capacitor is grounded; the 2 nd pin and the 7 th pin of the double-pole double-throw switch are connected with the power amplifier, the 3 rd pin and the 6 th pin of the double-pole double-throw switch are connected with the built-in loudspeaker of the flat-panel television, and the 4 th pin and the 5 th pin of the double-pole double-throw switch are connected with the external sound box.
In the audio output control circuit, the switch tube includes a triode, the first end is a base electrode of the triode, the second end is an emitter electrode of the triode, and the third end is a collector electrode of the triode.
A flat panel television comprises a mainboard, a power amplifier and the audio output control circuit.
Compared with the prior art, the utility model provides a flat-panel television and audio output control circuit, wherein, the audio output control circuit of flat-panel television is connected with the mainboard and the power amplifier of flat-panel television respectively, and the audio output control circuit includes switch module and switching module; the switch module is respectively connected with the mainboard and the switching module and is used for switching on or off according to a control signal output by the mainboard; the switching module is connected with the power amplifier and used for controlling the audio signals output by the power amplifier to be output through the corresponding audio output channels according to the connection or disconnection of the switch module, so that the automatic switching of the audio output channels of the flat-panel television is realized, the flat-panel television can be matched with the soundbar loudspeaker box when the soundbar small plate is not designed, and the compatibility of the flat-panel television is improved.
Drawings
Fig. 1 is a block diagram of a flat panel television according to the present invention;
fig. 2 is a schematic circuit diagram of an audio output control circuit according to the present invention;
reference numerals: 10: an audio output control circuit; 20: a power amplifier; 30: a loudspeaker is arranged inside; 40: an external sound box; 100: a switch module; 200, a switching module; 110, a switch unit; a feedback unit 120; 130, a pull-up unit.
Detailed Description
An object of the utility model is to provide a flat screen television and audio output control circuit for flat screen television also can match the soundbar audio amplifier when not designing the soundbar platelet, improves flat screen television's compatibility.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, the utility model provides an audio output control circuit 10 of a flat-panel television is connected with a main board of the flat-panel television and a power amplifier 20 respectively, wherein, the audio output control circuit 10 includes a switch module 100 and a switch module 200, the switch module 100 is connected with the main board and the switch module 200 respectively and is used for switching on or off according to a control signal output by the main board, the main board outputs a corresponding control signal to the switch module 100 according to whether the flat-panel television is connected to an external sound box 40, and controls the working state of the switch module 100; the switching module 200 is connected to the power amplifier 20 and configured to control the audio signal output by the power amplifier 20 to be output through a corresponding audio output channel according to the connection or disconnection of the switch module 100, where the corresponding audio output channel includes two channels, one channel is correspondingly connected to the built-in speaker 30 of the flat-panel television, and the other channel is correspondingly connected to the external speaker 40; the switching module 200 can identify whether the external speaker 40 is connected at this time according to the state of the switch module 100, so as to select the corresponding audio output channel to output the audio signal output by the power amplifier 20, so as to implement that the soundbar speaker can be matched when the soundbar platelet is not designed for the flat panel television, thereby improving the compatibility of the flat panel television.
Further, the switch module 100 includes a switch unit 110, and the switch unit 110 is connected to the main board and the switch module 200 and is configured to be turned on or off according to a control signal output by the main board; specifically, the default state of the flat panel television is that the switch unit 110 is in an off state; after the flat-panel television is powered on and operated, if the flat-panel television is not connected with the external sound box 40, the control signal output by the corresponding main board is a low-level signal, the corresponding switch unit 110 keeps a disconnected state, the switching module 200 outputs the audio signal output by the power amplifier 20 to the internal loudspeaker 30, and at this time, the internal loudspeaker 30 outputs the audio signal; if the flat-panel television is connected with the external sound box 40, the control signal output by the corresponding main board is a high-level signal, the high-level signal controls the switch unit 110 to be switched on, the switching module 200 selects to output the audio signal output by the power amplifier 20 to the external sound box 40, and the external sound box 40 outputs the audio signal; the utility model discloses a set up switch unit 110 and switching module 200, but automatic switch-over audio output channel when the flat screen television is connected with external audio amplifier 40 selects external audio amplifier 40 output audio signal, otherwise just selects built-in loudspeaker 30 output audio signal, and then improves flat screen television's compatibility.
Further, the switch module 100 further includes a feedback unit 120 and a pull-up unit 130; the feedback unit 120 is connected to the pull-up unit 130 and the switch unit 110, respectively, and is configured to output a feedback signal to the switch unit 110 when the flat panel television is connected to the external sound box 40; the pull-up unit 130 is configured to pull up the feedback signal into a high level signal; the switching unit 110 is configured to be turned on according to the feedback signal; the external sound box 40 connected to the flat-panel television may be a soundbar sound box or other sound boxes designed by itself, and if the external sound box is connected to the soundbar sound box, the main board outputs a corresponding control signal to control the state of the switch unit 110, so that the switching module 200 selects a corresponding audio output channel; if the sound box is other sound boxes designed by self, when the sound box is connected, the feedback unit 120 provides a feedback signal to the switch unit 110, the corresponding pull-up unit 130 pulls the signal up to a high-level signal, then the switch unit 110 is turned on according to the high-level feedback signal, the control switch module 200 selects to output the audio signal to the sound box, and the sound box outputs the audio signal to the outside, so that the automatic switch of the audio signal output channel is effectively realized, and the automatic matching of the flat panel television and the external sound box 40 is satisfied.
Further, referring to fig. 2, the switch unit 110 includes a switch transistor Q1, a first resistor R1, and a second resistor R2; the first end of the switching tube Q1 is connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected to the main board, the pull-up unit 130 and the feedback unit 120, the other end of the second resistor R2 and the second end of the switching tube Q1 are grounded, and the third end of the switching tube Q1 is connected to the switching module 200; in this embodiment, the switching tube Q1 includes a triode, the first end is a gate of the triode, the second end is an emitter of the triode, and the third end is a collector of the triode; when the flat-panel television is not connected with the external sound box 40, the control signal (in this embodiment, the SOC _ I/O signal) output by the main board is a low level signal, and the triode is controlled to be in an off state; when the flat television is connected with the external sound box 40, the control signal output by the main board is a high level signal, and the triode is controlled to be in a conducting state; if the external speaker 40 is a speaker designed by the user, the transistor is switched to the on state according to the high-level feedback signal, so that the subsequent control switching module 200 selects the corresponding audio output channel to output the audio signal.
Further, the feedback unit 120 includes a third resistor R3, one end of the third resistor R3 is connected to the feedback signal input end, and the other end of the third resistor R3 is connected to the other end of the first resistor R1 and the pull-up unit 130, when the external speaker 40 connected to the flat panel television is a self-designed speaker, the feedback unit 120 outputs a feedback signal (in this embodiment, a BUCK _ CTL signal) to the base of the transistor, and due to the existence of the pull-up unit 130, the pull-up unit 130 pulls up the feedback signal to a high level signal, thereby controlling the transistor to be turned on.
Further, the pull-up unit 130 includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the other end of the third resistor R3 and the other end of the first resistor R1, and the other end of the fourth resistor R4 is connected to power; when the external sound box 40 connected with the flat-panel television is a self-designed sound box, 3.3V voltage is introduced from the main board when the plug wire terminal of the flat-panel television is designed; after the self-designed speaker is plugged, the speaker feeds back a high level signal, so that the subsequent switching module 200 automatically switches the audio output channel.
Further, the switching module 200 includes a double-pole double-throw switch, a fifth resistor R5, a capacitor C1, and a diode D1; the 1 st pin of the double-pole double-throw switch is respectively connected with one end of a fifth resistor R5 and the anode of a diode D1, the other end of the fifth resistor R5 is connected with the third end of a switch tube Q1, the 8 th pin of the double-pole double-throw switch, the anode of the diode D1 and one end of a capacitor C1 are all connected with electricity, and the other end of the capacitor C1 is grounded; the 2 nd pin and the 7 th pin of the double-pole double-throw switch are connected with the power amplifier 20, the 3 rd pin and the 6 th pin of the double-pole double-throw switch are connected with the built-in loudspeaker 30 of the flat-panel television, and the 4 th pin and the 5 th pin of the double-pole double-throw switch are connected with the external sound box 40; the double-pole double-throw switch in the embodiment is a relay K1 with a double-pole double-throw switch, wherein the 3 rd pin and the 6 th pin of the double-pole double-throw switch are normally closed contacts, the 4 th pin and the 5 th pin of the double-pole double-throw switch are normally open contacts, and the 1 st pin, the 2 nd pin, the 7 th pin and the 8 th pin are static contacts; the normally closed contact of the double-pole double-throw switch is correspondingly connected with the audio output channel of the built-in loudspeaker 30, and the normally open contact of the double-pole double-throw switch is correspondingly connected with the audio output channel of the external sound box 40.
The initial state of the flat television is that the knife of the double-pole double-throw switch is at the normally closed contact, after the flat television is turned on, if the flat television is connected with the external sound box 40, the control signal is a low level signal, the triode is not conducted, the coil of the relay K1 is not electrified, the knife of the relay K1 is at the normally closed contact, then the audio signals (the AMP _ L signal and the AMP _ R signal in the embodiment) from the power amplifier 20 pass through the relay K1 and are respectively output to the audio output channel of the built-in SPEAKER 30, that is, the knife of the relay K1 is connected to the signal end of the INNER _ SPEAKER _ L and the signal end of the INNER _ SPEAKER _ R, and at this time, the built-in SPEAKER 30 outputs the audio signals; if the flat television is connected with the external sound box 40, the control signal is a high level signal, the triode is conducted, the coil of the relay K1 is electrified, the switch of the relay K1 is switched to the normally open contact, then the audio signal from the power amplifier 20 is respectively output to the audio output channel of the external sound box 40 through the relay K1, namely the switch of the relay K1 is connected to a SOUNDBAR _ L signal end and a SOUNDBAR _ R signal end, and the external sound box 40 outputs the audio signal; if the external audio amplifier 40 that corresponds is not the purchase wantonly in the market, but design by oneself, this external audio amplifier 40 can feed back a high level signal to triode, the control triode switches on, the plug-in strip of the relay K1 that corresponds also can switch to normally open contact, switch audio output channel is the audio output channel of external audio amplifier 40, relay K1's plug-in strip is connected to SOUNDBAR _ L signal end and SOUNDBAR _ R signal end promptly, external audio amplifier 40 outputs audio signal, therefore the utility model discloses a set up a relay K1 of taking double-pole double throw switch, adopt an external triode to control relay K1's normally closed contact and normally open contact, and then control the automatic switch of two audio output channels of built-in loudspeaker 30 and 40 for the flat screen television is when not designing the SOUNDBAR platelet, also can match the SOUNDBAR audio amplifier, improves the compatibility of flat screen television.
Further, the present invention also provides a flat tv, which comprises a main board, a power amplifier 20 and the audio output control circuit 10. The flat panel television can be a television or other electric equipment which needs to output an audio signal, and the embodiment takes the flat panel television as the television as an example for explanation; two sound output options are arranged in a menu of the television, namely an internal loudspeaker 30 and an external sound box 40; the sound output of the television is defaulted to the built-in loudspeaker 30, at the moment, a knife switch of the relay K1 is dropped on a normally closed contact, at the moment, the sound is output on an audio output channel of the built-in loudspeaker 30, and the sound is output to the built-in loudspeaker 30; if the user wants to access the external sound box 40, the sound output item in the menu is selected as the external sound box 40, the mainboard controls to output a high level at the moment, the triode is conducted, the coil of the relay K1 is electrified to generate a magnetic field, the double-pole double-throw switch of the relay K1 is automatically switched to the normally open contact, and at the moment, the sound is output to the audio output channel of the external sound box 40, so that the automatic switching of the audio output channel of the television is realized, the television is convenient to match with the external sound box 40, the compatibility is improved, and the user can select the corresponding configuration according to the own requirements.
To sum up, the utility model provides a flat-panel television and audio output control circuit, wherein, the audio output control circuit of flat-panel television is connected with the mainboard and the power amplifier of flat-panel television respectively, the audio output control circuit includes switch module and switching module; the switch module is respectively connected with the mainboard and the switching module and is used for switching on or off according to a control signal output by the mainboard; the switching module is connected with the power amplifier and used for controlling the audio signals output by the power amplifier to be output through the corresponding audio output channels according to the connection or disconnection of the switch module, so that the automatic switching of the audio output channels of the flat-panel television is realized, the flat-panel television can be matched with the soundbar loudspeaker box when the soundbar small plate is not designed, and the compatibility of the flat-panel television is improved.
It should be understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution and the inventive concept of the present invention, and all such changes or substitutions shall fall within the scope of the appended claims.
Claims (9)
1. The utility model provides an audio output control circuit which characterized in that, audio output control circuit is connected with the mainboard and the power amplifier of flat screen television respectively, audio output control circuit includes:
the switching module is connected with the switching module;
the switch module is respectively connected with the mainboard and the switching module and is used for switching on or off according to a control signal output by the mainboard;
the switching module is connected with the power amplifier and used for controlling the audio signal output by the power amplifier to be output through a corresponding audio output channel according to the connection or disconnection of the switch module.
2. The audio output control circuit of claim 1, wherein the switch module comprises:
and the switch unit is connected with the mainboard and the switching module and is used for switching on or off according to the control signal output by the mainboard.
3. The audio output control circuit of claim 2, wherein the switch module further comprises:
a feedback unit and a pull-up unit;
the feedback unit is respectively connected with the pull-up unit and the switch unit and is used for outputting a feedback signal to the switch unit when the flat-panel television is connected with an external sound box;
the pull-up unit is used for pulling up the feedback signal into a high-level signal;
the switch unit is used for conducting according to the feedback signal.
4. The audio output control circuit according to claim 3, wherein the switching unit includes:
the switch tube, the first resistor and the second resistor;
the first end of the switch tube is connected with one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected with the mainboard, the pull-up unit and the feedback unit respectively, the other end of the second resistor is grounded with the second end of the switch tube, and the third end of the switch tube is connected with the switching module.
5. The audio output control circuit according to claim 4, wherein the feedback unit includes:
and one end of the third resistor is connected with a feedback signal input end, and the other end of the third resistor is connected with the other end of the first resistor and the pull-up unit.
6. The audio output control circuit according to claim 5, wherein the pull-up unit includes:
and one end of the fourth resistor is connected with the other end of the third resistor and the other end of the first resistor, and the other end of the fourth resistor is connected with the power supply.
7. The audio output control circuit of claim 4, wherein the switching module comprises:
the double-pole double-throw switch, the fifth resistor, the capacitor and the diode;
a 1 st pin of the double-pole double-throw switch is respectively connected with one end of a fifth resistor and the anode of a diode, the other end of the fifth resistor is connected with a third end of the switch tube, an 8 th pin of the double-pole double-throw switch, the anode of the diode and one end of the capacitor are all connected with electricity, and the other end of the capacitor is grounded;
the 2 nd pin and the 7 th pin of the double-pole double-throw switch are connected with the power amplifier, the 3 rd pin and the 6 th pin of the double-pole double-throw switch are connected with the built-in loudspeaker of the flat-panel television, and the 4 th pin and the 5 th pin of the double-pole double-throw switch are connected with the external sound box.
8. The audio output control circuit of claim 4, wherein the switching tube comprises:
the first end of the triode is a base electrode of the triode, the second end of the triode is an emitting electrode of the triode, and the third end of the triode is a collector electrode of the triode.
9. A flat panel television, comprising:
a main board;
a power amplifier;
the audio output control circuit of any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022694874.5U CN214045982U (en) | 2020-11-19 | 2020-11-19 | Flat-panel television and audio output control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022694874.5U CN214045982U (en) | 2020-11-19 | 2020-11-19 | Flat-panel television and audio output control circuit |
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| Publication Number | Publication Date |
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| CN214045982U true CN214045982U (en) | 2021-08-24 |
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| CN202022694874.5U Active CN214045982U (en) | 2020-11-19 | 2020-11-19 | Flat-panel television and audio output control circuit |
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