CN203167212U - Earphone output circuit and TV set - Google Patents
Earphone output circuit and TV set Download PDFInfo
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- CN203167212U CN203167212U CN 201320115305 CN201320115305U CN203167212U CN 203167212 U CN203167212 U CN 203167212U CN 201320115305 CN201320115305 CN 201320115305 CN 201320115305 U CN201320115305 U CN 201320115305U CN 203167212 U CN203167212 U CN 203167212U
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Abstract
The utility model provides an earphone output circuit comprising a power supply module, an audio frequency signal amplifier, an output signal processing module, an earphone socket, and a plugging detection module. The output signal processing module can be used for filtering and frequency compensation processing of audio frequency signals. The plugging detection module can be used to detect whether the earphone is plugged. The utility model also provides a TV set comprising the earphone output circuit. According to the earphone output circuit and the TV set provided by the utility model, the non-mechanical earphone socket can be used to prevent the problems that the mis-recognition of the earphone plugging and the abnormal mute horn of the TV set occur, when the contact mechanical spring is weak. The plugging detection module can be adapted to the adjustable earphone (the general impedance is in a range from 16 ohms to 2K ohms), and can be used to guarantee the normal signal logic recognition during the output of the low frequency large amplitude earphone, and can be used to prevent the gain inequality of the left sound track and the right sound track effectively, and can be used to solve the technical problem of the attenuation of the earphone output signals. The earphone output circuit and the TV set have advantages of high reliability, low costs, high stability, good performance, and wide application range.
Description
Technical field
The utility model relates to a kind of earphone output circuit, relates in particular to a kind of earphone output circuit of television set.
Background technology
Television set is the indispensable a kind of electric equipment of modern, and at present a lot of LCD TV all are equipped with earphone, especially the LCD TV below 32 cun.The user can appreciate television field frame alone and not have influence on other people by earphone, the user can export to active loundspeakers with television field frame by earphone interface simultaneously, thereby make people experience the enjoyment that TV brings better, so earphone is extremely important for TV.
For the television set that is equipped with ear-phone function, need handle the problem of loudspeaker and earphone output well: loudspeaker will be in mute state when loudspeaker will normally export, have earphone to insert when namely not having earphone to insert, and therefore needed to solve the problem of earphone plug identification.The earphone socket of using all is the socket that has mechanical switch basically at present, and mainly handle by the following method: 1) receiver J-Horner is connected by mechanism as switch and is cut off the loudspeaker audio signal path, and loudspeaker and earpiece audio signal path are on same circuit.This method will produce long wiring, restriction PCB layout; Adopt mechanical earphone socket, reliability is low, cost is high; Can not be suitable for the output of adjustable earphone and low frequency large-signal, little, the poor stability of the scope of application.2) utilize the mechanical property of receiver J-Horner to do detection.This method adopts mechanical earphone socket equally, and reliability is low, cost is high; Can not be suitable for the output of adjustable earphone and low frequency large-signal, little, the poor stability of the scope of application.
The utility model content
The utility model provides a kind of earphone output circuit, is intended to solve in the prior art owing to adopt mechanical earphone socket to cause the low technical problem of reliability.In order to solve the problems of the technologies described above, the utility model adopts following scheme to be achieved:
A kind of earphone output circuit comprises supply module, also comprises:
Audio signal amplifier, be used for audio signal is carried out output signal processing module, the earphone socket that filtering, frequency compensation handles and the plug detection module that whether inserts for detection of earphone;
First output of described supply module is connected with the first input end of described audio signal amplifier, and second output of described supply module is connected with the first input end of described plug detection module;
Second input of described audio signal amplifier is the input of described earphone output circuit, the input original audio signal; The output of described audio signal amplifier is connected with the input of described output signal processing module;
The output of described output signal processing module is connected respectively with second input of the input of described earphone socket, described plug detection module, and the output of described plug detection module is the output of described earphone output circuit.
Further, described plug detection module comprises filtration module and is used for judging the judge module whether earphone inserts;
The first input end of described filtration module is connected with first pin of described earphone socket, first output of described output signal processing module, second input of described filtration module is connected with the tripod of described earphone socket, second output of described output signal processing module, the output of described filtration module is connected with the first input end of described judge module, second input of described judge module is connected with described supply module, the output output identification signal of described judge module.
Further, described filtration module comprises first resistance, second resistance and electric capacity;
First end of described first resistance is connected with first pin of described earphone socket, and second end of described second resistance is by described capacity earth; First end of described second resistance is connected with the tripod of described earphone socket, and second end of described second resistance is connected with second end of described first resistance; Second end of described second resistance is the input of described filtration module.
Further, described judge module comprises the 3rd resistance, the 4th resistance, triode and diode;
First end of described the 3rd resistance is second input of described judge module, and second end of described the 3rd resistance is connected with the collector electrode of described triode; The output of the very described judge module of the current collection of described triode, the output identification signal, the grounded emitter of described triode, the base stage of described triode is connected with the anode of described diode; The negative electrode of described diode is the first input end of described judge module; Described the 4th resistance one end is connected with first end of described the 3rd resistance, and the other end is connected with the negative electrode of described diode.
Further, described triode is NPN type triode.
Further, described diode is voltage stabilizing didoe, and its voltage stabilizing value scope is 3-5V.
The utility model also provides a kind of television set, comprises as above arbitrary described earphone output circuit.
A kind of earphone output circuit and television set that the utility model provides adopt the on-mechanical earphone socket, have avoided mechanical spring loose contact mistiming to be identified as earphone and have inserted, cause the TV loudspeaker noiseless unusual; And the plug detection module can adapt to adjustable earphone (general impedance from 16 ohm to 2K ohm) and significantly during earphone output, guarantee that the identification signal logic is normal at low frequency; And can effectively avoid the left and right acoustic channels gain inequality and to the technical problem of the decay of earphone output signal.Advantage such as therefore the utlity model has the reliability height, cost is low, stability is high, performance is good, applied widely has extensive use value.
Description of drawings
Fig. 1 is the theory diagram of the earphone output circuit that provides of the utility model one embodiment;
Fig. 2 is the detailed circuit diagram of the earphone output circuit that provides of the utility model one embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The detailed description embodiment is as follows:
With reference to Fig. 1, Fig. 1 is the theory diagram of the earphone output circuit that provides of the utility model one embodiment.Among the utility model embodiment, a kind of earphone output circuit 10 is provided, has comprised supply module 1, audio signal amplifier 2, be used for audio signal is carried out filtering, output signal processing module 3, the earphone socket 4 of frequency compensation processing and the plug detection module 5 that whether inserts for detection of earphone;
First output of supply module 1 is connected with the first input end of audio signal amplifier 2, and second output of supply module 1 is connected with the first input end of plug detection module 5;
Second input of audio signal amplifier 2 is the input of entire headset output circuit 10, the input original audio signal; The output of audio signal amplifier 2 is connected with the input of output signal processing module 3;
The output of output signal processing module 3 is connected respectively with the input of earphone socket 4, second input of plug detection module 5, and the output of plug detection module 5 is the output of entire headset output circuit 10.
With reference to Fig. 2, plug detection module 5 comprises filtration module 51 and is used for judging the judge module 52 whether earphone inserts;
The first input end of filtration module 51 is connected with first pin of earphone socket 4, first output of output signal processing module 3, second input of filtration module 51 is connected with the tripod of earphone socket 4, second output of output signal processing module 3, the output of filtration module 51 is connected with the first input end of judge module 52, second input of judge module 52 is connected with supply module, the output output identification signal of judge module 52.
Filtration module 51 comprises first resistance R 1, second resistance R 2 and the capacitor C;
First end of first resistance R 1 is connected with first pin of earphone socket 4, and second end of second resistance R 1 is by capacitor C ground connection; First end of second resistance R 2 is connected with the tripod of earphone socket 4, and second end of second resistance R 2 is connected with second end of first resistance R 1; Second end of second resistance R 2 is the input of filtration module 51.
First end of the 3rd resistance R 3 is second input of judge module 52, and second end of the 3rd resistance R 3 is connected with the collector electrode of triode Q; The current collection of triode Q is the output of judge module 52 very, the output identification signal, and the grounded emitter of triode Q, the base stage of triode Q is connected with the anode of diode D; The negative electrode of diode D is the first input end of judge module 52; The 4th resistance R 4 one ends are connected with first end of the 3rd resistance R 3, and the other end is connected with the negative electrode of diode D.
Further, triode Q is NPN type triode.
Further, diode D is voltage stabilizing didoe, and voltage stabilizing value scope is 3-5V.
Set forth the operation principle of earphone output circuit 10 below in conjunction with Fig. 1, Fig. 2.
Particularly, output signal processing module 3 output left channel audio signal S_L and right channel audio signal S_R are AC signal.
(1) when left channel audio signal S_L and right channel audio signal S_R are non-low frequency signal, left channel audio signal S_L is through first resistance R 1 and capacitor C filtering, right channel audio signal S_R through second resistance R 2 and capacitor C filtering after, the magnitude of voltage that A is ordered does not have influence substantially, and namely audio signal is 0V at the magnitude of voltage that the A point produces.
When not having earphone to insert, first pin and the tripod of earphone socket 4 are unsettled, and it is infinitely great that impedance is approximately, and the voltage that supply module 1 provides makes diode D conducting by the 4th resistance R 4, further make triode Q saturation conduction, and identification signal is low level;
When earphone inserts earphone socket 4, first pin of earphone socket 4 links to each other with right earphone with left earphone respectively with tripod, impedance is approximately earphone impedance, then the voltage that provides of supply module 1 by the 4th resistance R 4, first resistance R 1, second resistance R 2 and earphone dividing potential drop after, make the A point voltage be lower than the voltage of voltage regulation of diode D, diode D ends, and further makes triode Q end, and identification signal is high level.
(2) when left channel audio signal S_L and right channel audio signal S_R are low frequency signal and amplitude big (for example frequency is that 80HZ, effective value are up to 2V), because electric capacity has impedance operator, first resistance R 1, capacitor C produce the score effect to left channel audio signal S_L, second resistance R 2, capacitor C produce the score effect to right channel audio signal S_R, make A point stack one direct current voltage, namely audio signal to make the magnitude of voltage of A point generation be that VA(reaches as high as 2V).
When not having earphone to insert, first pin and the tripod of earphone socket 4 are unsettled, and it is infinitely great that impedance is approximately, the voltage that supply module 1 provides and voltage VA one work, make diode D conducting by the 4th resistance R 4, further make triode Q saturation conduction, identification signal is low level.
When earphone inserts, first pin of earphone socket 4 links to each other with right earphone with left earphone respectively with tripod, impedance is approximately earphone impedance, then the voltage and the voltage VA one that provide of supply module 1 works, after the 4th resistance R 4, first resistance R 1, second resistance R 2 and earphone dividing potential drop, make the A point voltage be lower than the voltage of voltage regulation of diode D, diode D ends, further make triode Q end, identification signal is high level.
The television set master chip can be judged whether earphone inserts in the earphone socket 4, and carry out different functions according to the height of identification signal level.
The utility model also provides a kind of television set, comprises above-mentioned earphone output circuit.
In sum, a kind of earphone output circuit and television set that the utility model provides adopt the on-mechanical earphone socket, have avoided mechanical spring loose contact mistiming to be identified as earphone and have inserted, cause the TV loudspeaker noiseless unusual; And the plug detection module can adapt to adjustable earphone (general impedance from 16 ohm to 2K ohm) and significantly during earphone output, guarantee that the identification signal logic is normal at low frequency; And can effectively avoid the left and right acoustic channels gain inequality and to the technical problem of the decay of earphone output signal.Advantage such as therefore the utlity model has the reliability height, cost is low, stability is high, performance is good, applied widely has extensive use value.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. an earphone output circuit comprises supply module, it is characterized in that, described earphone output circuit also comprises:
Audio signal amplifier, be used for audio signal is carried out output signal processing module, the earphone socket that filtering and frequency compensation handle and the plug detection module that whether inserts for detection of earphone;
First output of described supply module is connected with the first input end of described audio signal amplifier, and second output of described supply module is connected with the first input end of described plug detection module;
Second input of described audio signal amplifier is the input of described earphone output circuit; The output of described audio signal amplifier is connected with the input of described output signal processing module;
The output of described output signal processing module is connected with the input of described earphone socket and second input of described plug detection module respectively, and the output of described plug detection module is the output of described earphone output circuit.
2. earphone output circuit as claimed in claim 1 is characterized in that, described plug detection module comprises filtration module and is used for judging the judge module whether earphone inserts;
The first input end of described filtration module is connected with first pin of described earphone socket and first output of described output signal processing module respectively, second input of described filtration module is connected with the tripod of described earphone socket and second output of described output signal processing module respectively, the output of described filtration module is connected with the first input end of described judge module, second input of described judge module is connected with described supply module, the output output identification signal of described judge module.
3. earphone output circuit as claimed in claim 2 is characterized in that, described filtration module comprises first resistance, second resistance and electric capacity;
First end of described first resistance is connected with first pin of described earphone socket, and second end of described second resistance is by described capacity earth; First end of described second resistance is connected with the tripod of described earphone socket, and second end of described second resistance is connected with second end of described first resistance; Second end of described second resistance is the input of described filtration module.
4. earphone output circuit as claimed in claim 2 is characterized in that, described judge module comprises the 3rd resistance, the 4th resistance, triode and diode;
First end of described the 3rd resistance is second input of described judge module, and second end of described the 3rd resistance is connected with the collector electrode of described triode; The output of the very described judge module of the current collection of described triode, the output identification signal, the grounded emitter of described triode, the base stage of described triode is connected with the anode of described diode; The negative electrode of described diode is the first input end of described judge module; Described the 4th resistance one end is connected with first end of described the 3rd resistance, and the other end is connected with the negative electrode of described diode.
5. earphone output circuit as claimed in claim 4 is characterized in that, described triode is NPN type triode.
6. earphone output circuit as claimed in claim 4 is characterized in that, described diode is voltage stabilizing didoe, and its voltage stabilizing value scope is 3-5V.
7. a television set is characterized in that, comprises each described earphone output circuit as claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320115305 CN203167212U (en) | 2013-03-14 | 2013-03-14 | Earphone output circuit and TV set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320115305 CN203167212U (en) | 2013-03-14 | 2013-03-14 | Earphone output circuit and TV set |
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| Publication Number | Publication Date |
|---|---|
| CN203167212U true CN203167212U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320115305 Expired - Fee Related CN203167212U (en) | 2013-03-14 | 2013-03-14 | Earphone output circuit and TV set |
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| CN (1) | CN203167212U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924499A (en) * | 2021-01-27 | 2021-06-08 | 三诺生物传感股份有限公司 | Test strip inserting strip identification device, test strip sample suction judgment device and test strip sample suction judgment method |
-
2013
- 2013-03-14 CN CN 201320115305 patent/CN203167212U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924499A (en) * | 2021-01-27 | 2021-06-08 | 三诺生物传感股份有限公司 | Test strip inserting strip identification device, test strip sample suction judgment device and test strip sample suction judgment method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20170314 |
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| CF01 | Termination of patent right due to non-payment of annual fee |