CN200969673Y - Earphone silent circuit and television set having the same - Google Patents
Earphone silent circuit and television set having the same Download PDFInfo
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- CN200969673Y CN200969673Y CN 200620087744 CN200620087744U CN200969673Y CN 200969673 Y CN200969673 Y CN 200969673Y CN 200620087744 CN200620087744 CN 200620087744 CN 200620087744 U CN200620087744 U CN 200620087744U CN 200969673 Y CN200969673 Y CN 200969673Y
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- power amplifier
- earphone
- mute
- resistance
- amplifier chip
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Abstract
The utility model discloses an earphone mute circuit and a tv set arranged with the earphone mute circuit. The utility model consists of a power magnify circuit and an earphone socket circuit, a power magnify chip is comprised in the power magnify circuit. The power magnify chip's mute crus is grounding by a first divider resistor on one hand, and is connected with a dc power supply by a second divider resistor on the other hand; in the earphone socket circuit, the earphone's common end which is accessed to a switch is grounding by a series resistance, a normally open contact thereof is connected with the power magnify chip's mute crus. The utility model utilizes the character of that the power magnify chip's working state can be controlled when the power magnify chip's mute crus is arranged at different potentials. By connecting the power magnify chip's mute crus with a resistor dividing voltage network and connecting the earphone switch's common end with a divider resistor which is serially connected to the ground, the utility model changes the potential which is input to the power magnify chip's mute crus when the earphone is accessed to accurately control the power magnify chip's work under a mute condition, thus a main channel's reliable mute is realized.
Description
Technical field
The utility model relates to a kind of earphone mute circuit that is widely used in audio-frequence player device, and the power amplifier main channel is thoroughly quiet when being implemented in the access earphone.
Background technology
In liquid crystal TV set, one road earphone voice output interface is all arranged usually, when the user connects earphone by the earphone sound interface, can listen to TV programme by earphone, this function is particularly suitable at night.Generally, when earphone was inserted headset output interface, the main channel of television set should not have voice output.But, owing to when connecting earphone, normally realize the quiet pin of main channel power amplifier is received ground on the circuit with the mechanical switch of earphone.At this moment, because the input of power amplifier still has input signal, and the problems such as operation principle of power amplifier itself, at this moment on circuit, the quiet pin of main channel power amplifier is received ground really, but in fact the main channel still there is voice output.What this heard when reality is used may be abnormal noise, shows particularly evidently when the main channel volume is big, thereby has influenced the complete machine quality of LCD TV.
Summary of the invention
The utility model is in order to solve in the prior art problem that still there is voice output when earphone inserts television set headset output interface main channel, a kind of novel TV earphone mute circuit is provided, the power amplifier main channel is thoroughly quiet when having realized inserting earphone by simple circuit configuration, realization is convenient, effect is obvious, does not need to change existing circuit structure.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of earphone mute circuit comprises power amplifier and earphone socket circuit, includes a power amplifier chip in described power amplifier, and described power amplifier chip is controlled the power amplifier chip operations at 3 kinds of different conditions according to the current potential difference of its quiet pin; Wherein, the quiet pin of described power amplifier chip connects DC power supply by second divider resistance on the other hand on the one hand by the first divider resistance ground connection; In the earphone socket circuit, earphone inserts the common port of switch by a series connection grounding through resistance, and its normally opened contact connects the quiet pin of described power amplifier chip.
Wherein, the model of described power amplifier chip is TDA1517P, its quiet pin current potential power amplifier chip operate as normal when 8.5V is above, the power amplifier chip operation is in mute state when being 3.3V～6.4V at quiet pin current potential, and quiet pin current potential power amplifier chip when 2V is following is not worked.
The utility model is operated in mute state in order to make described power amplifier chip when inserting earphone, select the parameter value of DC power supply and divider resistance to be respectively: the magnitude of voltage of DC power supply is 12V, the resistance of first divider resistance is 100K Ω, the resistance of second divider resistance is 33K Ω, and the resistance that inserts the resistance that the switch common port is in series with described earphone is 33K Ω.
In conjunction with above-mentioned earphone mute circuit, the utility model has proposed a kind of television set with described earphone mute circuit again, the thorough quiet problem in power amplifier main channel when inserting to solve earphone, comprise power amplifier and earphone socket circuit, include a power amplifier chip in described power amplifier, described power amplifier chip is controlled the power amplifier chip operations at 3 kinds of different conditions according to the current potential difference of its quiet pin; Wherein, the quiet pin of described power amplifier chip connects DC power supply by second divider resistance on the other hand on the one hand by the first divider resistance ground connection; In the earphone socket circuit, earphone inserts the common port of switch by a series connection grounding through resistance, and its normally opened contact connects the quiet pin of described power amplifier chip.
Compared with prior art, advantage of the present utility model and good effect are: the utility model utilizes the power amplifier chip when its quiet pin is in different potentials, the characteristic that can control the operating state of power amplifier chip, by on the quiet pin of power amplifier chip, connecting resistance pressure-dividing network, and on the common port of headset switch, connect the divider resistance be connected in series to ground, make and when earphone inserts, change the current potential that is input on the quiet pin of power amplifier chip, and then control power amplifier chip accurately is operated in mute state, having overcome traditional mute circuit with this adopts when inserting earphone quiet pin ground connection, make the power amplifier chip be in off position connected mode the quiet pin of power amplifier that occurs easily because outside cause causes ground connection bad, thereby make the main channel still have the problem of voice output.Earphone mute circuit of the present utility model is simple in structure, effect is remarkable, has effectively realized power amplifier its main channel reliably quiet when earphone inserts, and has improved for example complete machine quality of audio output apparatus such as television set.
Description of drawings
Fig. 1 is the schematic diagram of existing earphone socket circuit;
Fig. 2 is an earphone mute circuit schematic diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
The operation principle of earphone socket once at first is described, as shown in Figure 1, the 1st, 2 pin are the R channel output pin of earphone, and the 3rd, 4 pin are the L channel output pin.When not inserting earphone, common port 6 pin and 9 pin of headset switch XSB are connected its normally-closed contact 7 pin and 10 pin respectively; When inserting earphone, common port 6 pin of headset switch XSB, 9 pin connect its normally opened contact 8 pin and 11 pin respectively.Utilize this characteristic, common port 6 pin, 9 pin of headset switch XSB are connected to ground, 8 pin, 11 pin are connected to the quiet pin of main channel power amplifier.When not connecting earphone, main channel power amplifier operate as normal, sound is normally exported; When connecting earphone, by the effect of mechanical switch, 6,9 pin are linked to each other with 8,11 pin respectively, at this moment just the quiet pin of main channel power amplifier is received ground, make the power amplifier chip be in off position, to realize the quiet of main channel.
Adopt above-mentioned principle to make the quiet meeting in main channel have a defective, input pin still has input when power amplifier is not worked exactly, and other pin voltage of power amplifier also normally provide.So in case because outside cause makes the quiet pin ground connection of power amplifier bad, just might allow power amplifier work together once more, performance in practice then is noise to occur, thereby has had a strong impact on the performance quality of tv product.
In order to address the above problem, the utility model is achieved in that the operating state selection that utilizes power amplifier, and the operating state of power amplifier is set to mute state when inserting earphone, and power amplifier is still being worked like this, but its voice output has not had.In general, the power amplifier chip all has normal, quiet and three kinds of states of standby, sound is normally exported during operate as normal, holding state is exactly above-mentioned off position, it is normal to import all when power amplifier is operated in mute state, but output does not realize this three kinds of State Selection by the height of quiet pin voltage.Power amplifier chip TDA1517P with Philips company is an example, and the 8th pin of this power amplifier is quiet pin M/SS, and when the voltage of this pin is 8.5V operate as normal when above, voltage is operated in mute state when being 3.3V～6.4V, and voltage is that 2V does not work when following.
The designed earphone mute circuit of the utility model as shown in Figure 2, the quiet pin M/SS of power amplifier chip connects the 12V DC power supply by divider resistance R1, and by another divider resistance R2 ground connection, the resistance of described two divider resistance R1, R2 is respectively 33K Ω and 100K Ω.In the earphone socket circuit, common port 6 pin of headset switch XSB, 33K Ω resistance R 3 ground connection of 9 pin through connecting.When the power amplifier operate as normal, the voltage of its quiet pin M/SS is 12V*100/ (100+33)=9V; When earphone inserts earphone socket, 8 pin, 11 pin of headset switch XSB are connected to ground by resistance R 3, at this moment resistance R 2, R3 parallel connection, the resistance of its parallel resistance is 100*33/ (100+33)=25K Ω, at this moment, the voltage of the quiet pin M/SS of power amplifier chip is 12V*25/ (25+33)=5.2V, and the power amplifier chip operation can effectively be avoided aforesaid noise phenomenon in mute state.
The utility model has effectively been realized power amplifier main channel reliably quiet when inserting earphone by adopting above-mentioned simple circuit configuration, has improved the complete machine quality of audio output apparatus such as liquid crystal TV set.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (8)
1. an earphone mute circuit comprises power amplifier and earphone socket circuit, includes a power amplifier chip in described power amplifier, and described power amplifier chip is controlled the power amplifier chip operations at 3 kinds of different conditions according to the current potential difference of its quiet pin (M/SS); It is characterized in that: the quiet pin (M/SS) of described power amplifier chip connects DC power supply by second divider resistance (R1) on the other hand on the one hand by first divider resistance (R2) ground connection; In the earphone socket circuit, earphone inserts the common port of switch by series connection resistance (R3) ground connection, and its normally opened contact connects the quiet pin (M/SS) of described power amplifier chip.
2. earphone mute circuit according to claim 1, it is characterized in that: described power amplifier chip is in quiet pin (M/SS) operate as normal when current potential is higher, (M/SS) is operated in mute state when current potential is placed in the middle at quiet pin, do not work when quiet pin (M/SS) current potential is low.
3. earphone mute circuit according to claim 2, it is characterized in that: the model of described power amplifier chip is TDA1517P, its quiet pin (M/SS) current potential operate as normal when 8.5V is above, be operated in mute state when quiet pin (M/SS) current potential is 3.3V～6.4V, quiet pin (M/SS) current potential is not worked when 2V is following.
4. earphone mute circuit according to claim 3, it is characterized in that: the magnitude of voltage of described DC power supply is 12V, the resistance of first divider resistance (R2) is 100K Ω, the resistance of second divider resistance (R1) is 33K Ω, and resistance (R3) resistance that is in series with described earphone access switch common port is 33K Ω.
5. television set with the described mute circuit of claim 1, comprise power amplifier and earphone socket circuit, include a power amplifier chip in described power amplifier, described power amplifier chip is controlled the power amplifier chip operations at 3 kinds of different conditions according to the current potential difference of its quiet pin (M/SS); It is characterized in that: the quiet pin (M/SS) of described power amplifier chip connects DC power supply by second divider resistance (R1) on the other hand on the one hand by first divider resistance (R2) ground connection; In the earphone socket circuit, earphone inserts the common port of switch by series connection resistance (R3) ground connection, and its normally opened contact connects the quiet pin (M/SS) of described power amplifier chip.
6. television set according to claim 5 is characterized in that: described power amplifier chip is in quiet pin (M/SS) operate as normal when current potential is higher, and (M/SS) is operated in mute state when current potential is placed in the middle at quiet pin, does not work when quiet pin (M/SS) current potential is low.
7. television set according to claim 6, it is characterized in that: the model of described power amplifier chip is TDA1517P, its quiet pin (M/SS) current potential operate as normal when 8.5V is above, be operated in mute state when quiet pin (M/SS) current potential is 3.3V～6.4V, quiet pin (M/SS) current potential is not worked when 2V is following.
8. television set according to claim 7, it is characterized in that: the magnitude of voltage of described DC power supply is 12V, the resistance of first divider resistance (R2) is 100K Ω, the resistance of second divider resistance (R1) is 33K Ω, and resistance (R3) resistance that is in series with described earphone access switch common port is 33K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620087744 CN200969673Y (en) | 2006-08-07 | 2006-08-07 | Earphone silent circuit and television set having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620087744 CN200969673Y (en) | 2006-08-07 | 2006-08-07 | Earphone silent circuit and television set having the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200969673Y true CN200969673Y (en) | 2007-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620087744 Expired - Fee Related CN200969673Y (en) | 2006-08-07 | 2006-08-07 | Earphone silent circuit and television set having the same |
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| Country | Link |
|---|---|
| CN (1) | CN200969673Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103581795A (en) * | 2012-07-24 | 2014-02-12 | 蒂雅克股份有限公司 | Audio device with mute function |
| CN109195067A (en) * | 2018-07-20 | 2019-01-11 | 广州市欧智智能科技有限公司 | A kind of muting control circuit |
| CN110730399A (en) * | 2018-07-17 | 2020-01-24 | 青岛海信电器股份有限公司 | Display device earphone control circuit and display device |
-
2006
- 2006-08-07 CN CN 200620087744 patent/CN200969673Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103581795A (en) * | 2012-07-24 | 2014-02-12 | 蒂雅克股份有限公司 | Audio device with mute function |
| CN103581795B (en) * | 2012-07-24 | 2016-12-07 | 蒂雅克股份有限公司 | Possesses the audio devices of mute function |
| CN110730399A (en) * | 2018-07-17 | 2020-01-24 | 青岛海信电器股份有限公司 | Display device earphone control circuit and display device |
| CN109195067A (en) * | 2018-07-20 | 2019-01-11 | 广州市欧智智能科技有限公司 | A kind of muting control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071031 Termination date: 20100807 |