CN201001191Y - Control circuit for automatic mute main external power amplifier by earphone insertion - Google Patents
Control circuit for automatic mute main external power amplifier by earphone insertion Download PDFInfo
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- CN201001191Y CN201001191Y CNU2007200181500U CN200720018150U CN201001191Y CN 201001191 Y CN201001191 Y CN 201001191Y CN U2007200181500 U CNU2007200181500 U CN U2007200181500U CN 200720018150 U CN200720018150 U CN 200720018150U CN 201001191 Y CN201001191 Y CN 201001191Y
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- earphone
- divider resistance
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- power amplifier
- control circuit
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Abstract
The utility model discloses a main external power amplification control circuit and a television with automatic mute when an earphone is inserted, which comprises a main external power amplification circuit for output audio signals and an earphone audio processing circuit connected with an earphone terminal in the television; a main external power amplification mute control circuit is connected on at least one output terminal in the left sound track audio signal output terminal and the right sound track audio signal output terminal of the earphone terminal; in the main external power amplification mute control circuit, direct-current power supply is on one hand connected with the left sound track audio signal output terminal or the right sound track audio signal output terminal of the earphone terminal through a first divider resistance, and on the other hand, connected with the control terminal of a switching circuit, the switching circuit actuates when the control terminal receives a low level signal, and then outputs the mute signal in the required electric potential state to the mute network of the main external power amplification circuit; the resistance value of the divider resistance is greatly larger than the impedance of the earphone, therefore avoiding the defaults that an earphone socket with a mechanical switch in the general design proposal works unreliably without durability.
Description
Technical field
The utility model belongs to the head circuit technical field, specifically, relates to a kind of according to the outer whether quiet control circuit of power amplifier of the automatic control apparatus equipment of earphone insertion state master.
Background technology
For audio output apparatus such as the television set that has receiver J-Horner at present, broadcast receiver, MP3 or mobile phones, when earphone inserts, need carry out quiet processing to the main power amplifier of external output audio signal in the audio output apparatus, audio signal is only exported by earphone.Usually the design that adopts is to use the earphone terminal that has mechanical switch to realize, when earphone inserts, mechanical switch action by terminal inside produces control signal, and then is input to the quiet network of main outer amplifirer, realizes the quiet control to main outer amplifirer.Adopt this earphone terminal that has mechanical switch, in use have unreliable, short-life defective through regular meeting.
Summary of the invention
The utility model comes electric equipment master external work not being durable of putting that the quiet control of row produced into, unreliable problem for the control signal that solves the mechanical switch action that utilizes earphone terminal inside in the prior art and produce, provide a kind of novel earphone to insert the control circuit of the outer power amplifier of automatic mute master, the automatic mute function on master's external work discharge road when need not to utilize the action of mechanical switch can realize that earphone inserts, circuit structure is simple, working stability is reliable.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of earphone inserts the control circuit and the television set of the outer power amplifier of automatic mute master, comprises in the television set main external work the discharge road and the earpiece audio treatment circuit that is connected with the earphone terminal of external output audio signal; In the left and right sound channels audio signal output end of described earphone terminal, be connected with main outer power amplifier muting control circuit at least therein on one road output; Outside described master in the power amplifier muting control circuit, DC power supply connects the L channel or the right channel audio signal output of earphone terminal on the one hand by first divider resistance, the control end that connects a switching circuit on the other hand, described switching circuit moves when its control end receives low level signal, exports the mute signal of required potential state to the quiet network on described main external work discharge road; The resistance of described first divider resistance is much larger than the impedance of earphone self.
For fear of the switching circuit misoperation, between the control end of described switching circuit and first divider resistance, be connected with second divider resistance and filter network.When earphone inserted, effectively filtering exchanged the influence of audio signal to control circuit, and the voltage on the maintained switch circuit control end is stable.The resistance of described first divider resistance is chosen between 10K Ω～100K Ω, and second divider resistance is also chosen the bigger resistance device of resistance as far as possible, generally should be chosen at about 10K Ω.
Include a NPN type triode and a negater circuit in described switching circuit, described DC power supply connects described negater circuit by divider resistance, the level signal of input is carried out connecting after the negate base stage of a described NPN type triode; The grounded emitter of a described NPN type triode, collector electrode connect the quiet network on described main external work discharge road.
In described negater circuit, include the 2nd NPN type triode, its base stage is the control end of described switching circuit, connects described divider resistance, grounded emitter, collector electrode connects DC power supply on the one hand, connects the base stage of a described NPN type triode on the other hand.
For when inserting earphone, realize the automatic startup of television set CC function, described DC power supply connects filter network by first divider resistance, and then the literal of Video processing master chip shows control pin in the 3rd divider resistance connection television set, when described Video processing master chip shows that at its literal control pin receives low level signal, from program streams of information, extract Word message wherein, show by display screen output.
Compared with prior art, advantage of the present utility model and good effect are: head circuit of the present utility model is simple in structure, working stability is reliable, especially avoided adopting in the universal design scheme unreliable, the short-life defective of earphone socket work of band mechanical switch, only need use common earphone to insert terminal and can realize that earphone inserts the function of main outer power amplifier automatic mute, effectively reduce system cost, prolonged useful life.
Description of drawings
Fig. 1 is the control circuit schematic diagram that earphone of the present utility model inserts the outer power amplifier of automatic mute master.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
The electrical signal detection that is based on the main outer power amplifier automatic mute control circuit of earphone insertion that the utility model proposed realizes, overcome the conventional earphone circuit and need use unreliable, the short-life defective of earphone socket of being with mechanical switch, only need adopt the common headphones terminal to cooperate simple peripheral circuit to realize, as shown in Figure 1.
Among Fig. 1, in left and right sound channels audio signal output end L, the R of earphone terminal XS1, at least therein be connected with main outer power amplifier muting control circuit on one road output, in the utility model, adopt on left channel audio signal output L, to connect power amplifier muting control circuit outside the described master.Outside described master in the power amplifier muting control circuit, DC power supply 5V connects the left channel audio signal output L of earphone terminal XS1 on the one hand by the first divider resistance R6, the control end that connects a switching circuit on the other hand, described switching circuit moves when its control end receives low level signal, exports the mute signal of required potential state to the quiet network on described main external work discharge road; The resistance of the described first divider resistance R6 is much larger than the impedance of earphone self, and one removes and is chosen between 10K Ω～100K Ω, and in the utility model, the resistance of the described first divider resistance R6 is chosen for 10K Ω.
For when earphone inserts, voltage on the maintained switch circuit control end is stable, to avoid the switching circuit misoperation, guarantee that main external work discharge road is accurately quiet, the low-pass filter network that between the control end of described switching circuit and the first divider resistance R6, is connected with the second divider resistance R1 and forms by resistance R 2, capacitor C 1, by selecting the higher second divider resistance R1 and the bigger filter capacitor C1 of appearance value of resistance, thus effectively filtering exchange the influence of audio signal to switching circuit.The resistance of the described second divider resistance R1 generally should be chosen at about 10K Ω, and the appearance value of filter capacitor C1 generally is chosen for 47uF.
Described switching circuit can adopt as shown in Figure 1 two NPN type triode V1, V2 to connect realization, also can adopt special switch control chip to realize.If the switch control chip of selecting moves during for high level at input signal, then need set up negater circuit at its input, guaranteeing when earphone inserts, switch control chip precision maneuver is exported the mute signal MUTE of required level to the quiet network on main external work discharge road; And when earphone did not insert, the switch control chip was failure to actuate, and kept original state on main external work discharge road.
In order to reduce system cost, the utility model adopts V1, two NPN types of V2 triode to form described switching circuit, as shown in Figure 1.The base stage of the 2nd NPN type triode V2 connects the second divider resistance R1, grounded emitter, and collector electrode connects DC power supply 5V by resistance R 5 on the one hand, connects the base stage of a NPN type triode V1 on the other hand; The grounded emitter of a described NPN type triode V1, collector electrode connect the quiet network on main external work discharge road.Wherein, described the 2nd NPN type triode V2 and resistance R 5, DC power supply 5V form negater circuit, its base terminal voltage potential is carried out negate after, export to the base stage of a NPN type triode V1.The big resistance second divider resistance R1 of base stage series connection at a NPN type triode V1 stablizes and guarantees the impedance of whole network with the base potential that keeps a NPN type triode V1.
For when inserting earphone, realize that the television set literal shows the automatic startup of CC function, described DC power supply 5V connects the low-pass filter network of being made up of resistance R 8, capacitor C 2 by the first divider resistance R6, and then the literal of Video processing master chip HiDTV pro shows control pin GP_8 in the 3rd divider resistance R7 connection television set, when described Video processing master chip HiDTV pro shows that at its literal control pin GP_8 receives low level signal, from program streams of information, extract Word message wherein, show by display screen output.
For the normal startup of the accurate quiet and CC function that realizes main external work discharge road, need specifically select the R of described resistance R 1, R2, R7, R8, GP_8 resistance to earth and the 2nd NPN type triode V2 to the parameter of each components and parts in the circuit
BeTotal dc impedance far below the direct current of earphone equivalence resistance; The AC impedance of resistance R 1, R2, R3, R6, R7, R8, GP_8 resistance to earth, capacitor C 1 and V2 is much larger than the AC impedance of earphone.
Its operation principle is: when earphone did not insert, earphone terminal XS1 was in open-circuit condition, and the direct voltage at network G EN COM place is that (Re is a resistance R between R3 R1+R2+V2 emitter in parallel and the base stage to the first divider resistance R6 with Re
BeThe resistance to earth of R7+R8+HiDTV pro chip GP_8 pin in parallel again) dividing potential drop, direct voltage is about 3.1V.When the sound accompaniment disposable plates of television set has audio signal output, left and right audio signal HPOUT_L, HPOUT_R respectively through resistance R 17, R16, capacitance C8, C7 connect input+INA that model is the signal amplifier N1 of BA4558 ,+INB, after the left and right sound channels audio signal carried out power amplification and handle, by its two-way output OUTA, OUTB respectively through capacitance C3, C4 the corresponding connection of left and right sound channels audio signal output end L, R with earphone terminal XS1.The audio signal of amplifying output is superimposed upon on the DC level at described network G EN_COM place, and during the no signal input, network G EN_COM has only at the place DC level about 3.1V.
When not inserting earphone, the direct voltage at network G EN_COM place is through low-pass filter network R1, C1 filtering, affact the base stage of the 2nd NPN type triode V2 again through the second divider resistance R1, at this moment the voltage on the base stage is about 3V, triode V2 conducting, the one NPN type triode V1 ends, and quiet operation is not carried out on main external work discharge road, and sound accompaniment continues by main outer power amplifier output.Simultaneously, after the low-pass filter network that the direct voltage process resistance R 8 at network G EN_COM place and capacitor C 2 are formed carries out filtering, affact on the GP_8 pin of Video processing master chip HiDTV pro through the 3rd divider resistance R7 again, voltage on the GP_8 pin is about 3.0V at this moment, and the CC function does not start.
After earphone being inserted into earphone terminal XS1, because the impedance of earphone itself is very low, have only several ohms, so causing the direct voltage at network G EN_COM place reduces to about 0V, thereby cause the 2nd NPN type triode V2 to end, triode V1 conducting, the MUTE network is dragged down, and television set master external work discharge road is muted.Simultaneously, voltage on the GP_8 pin of Video processing master chip HiDTV pro is also reduced to about 0V, after Video processing master chip HiDTV pro detects low level on this pin, automatically open the CC function, like this, the normal person can pass through earphone listening to audio signal, and meanwhile, can understand programme content by watching Word message equally for the people who becomes deaf or other people.
When the utility model has made full use of the earphone insertion and has not inserted, the variation that circuit state takes place realizes the automatic mute control of the outer power amplifier of television set master and the automatic unlatching control of CC function, the mentality of designing novelty, circuit structure is simple and practical, can be widely used in broadcast receiver, MP3 or mobile phone etc. and have in the audio output apparatus of earphone terminal.
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 (10)
1. an earphone inserts the control circuit of the outer power amplifier of automatic mute master, comprises in the electric equipment main external work the discharge road and the earpiece audio treatment circuit that is connected with earphone terminal (XS1) of external output audio signal; It is characterized in that: in the left and right sound channels audio signal output end of described earphone terminal (XS1), be connected with main outer power amplifier muting control circuit at least therein on one road output; Outside described master in the power amplifier muting control circuit, DC power supply (5V) connects the L channel or the right channel audio signal output of earphone terminal (XS1) on the one hand by first divider resistance (R6), the control end that connects a switching circuit on the other hand, described switching circuit moves when its control end receives low level signal, exports the mute signal of required potential state to the quiet network on described main external work discharge road.
2. earphone according to claim 1 inserts the control circuit of the outer power amplifier of automatic mute master, it is characterized in that: be connected with second divider resistance (R1) and filter network between the control end of described switching circuit and first divider resistance (R6); The resistance of described first divider resistance (R6) is chosen between 10K Ω～100K Ω.
3. earphone according to claim 1 and 2 inserts the control circuit of the outer power amplifier of automatic mute master, it is characterized in that: in described switching circuit, include a NPN type triode (V1) and a negater circuit, described DC power supply (5V) is connected described negater circuit by first divider resistance (R6), filter network and second divider resistance (R1), the level signal of input is carried out connecting after the negate base stage of a described NPN type triode (V1); The grounded emitter of a described NPN type triode (V1), collector electrode connect the quiet network on described main external work discharge road.
4. earphone according to claim 3 inserts the control circuit of the outer power amplifier of automatic mute master, it is characterized in that: in described negater circuit, include the 2nd NPN type triode (V2), its base stage is the control end of described switching circuit, connect described second divider resistance (R1), grounded emitter, collector electrode connects DC power supply (5V) on the one hand, connects the base stage of a described NPN type triode (V1) on the other hand.
5. earphone according to claim 1 inserts the control circuit of the outer power amplifier of automatic mute master, it is characterized in that: described DC power supply (5V) connects filter network by first divider resistance (R6), and then the literal of main process chip shows control pin in the 3rd divider resistance (R7) connecting circuit equipment, when described main process chip shows that at its literal control pin receives low level signal, from program streams of information, extract Word message wherein, show by display screen output.
6. one kind has the television set that the described earphone of claim 1 inserts the outer power amplifier control circuit of automatic mute master, comprises in the television set main external work the discharge road and the earpiece audio treatment circuit that is connected with earphone terminal (XS1) of external output audio signal; It is characterized in that: in the left and right sound channels audio signal output end of described earphone terminal (XS1), be connected with main outer power amplifier muting control circuit at least therein on one road output; Outside described master in the power amplifier muting control circuit, DC power supply (5V) connects the L channel or the right channel audio signal output of earphone terminal (XS1) on the one hand by first divider resistance (R6), the control end that connects a switching circuit on the other hand, described switching circuit moves when its control end receives low level signal, exports the mute signal of required potential state to the quiet network on described main external work discharge road; The resistance of described first divider resistance (R6) is much larger than the impedance of earphone self.
7. television set according to claim 6 is characterized in that: be connected with second divider resistance (R1) and filter network between the control end of described switching circuit and first divider resistance (R6); The resistance of described first divider resistance (R6) is chosen between 10K Ω～100K Ω.
8. according to claim 6 or 7 described television sets, it is characterized in that: in described switching circuit, include a NPN type triode (V1) and a negater circuit, described DC power supply (5V) is connected described negater circuit by first divider resistance (R6), filter network and second divider resistance (R1), the level signal of input is carried out connecting after the negate base stage of a described NPN type triode (V1); The grounded emitter of a described NPN type triode (V1), collector electrode connect the quiet network on described main external work discharge road.
9. television set according to claim 8, it is characterized in that: in described negater circuit, include the 2nd NPN type triode (V2), its base stage is the control end of described switching circuit, connect described second divider resistance (R1), grounded emitter, collector electrode connects DC power supply (5V) on the one hand, connects the base stage of a described NPN type triode (V1) on the other hand.
10. television set according to claim 6, it is characterized in that: described DC power supply (5V) connects filter network by first divider resistance (R6), and then the literal of Video processing master chip shows control pin in the 3rd divider resistance (R7) connection television set, when described Video processing master chip shows that at its literal control pin receives low level signal, from program streams of information, extract Word message wherein, show by display screen output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200181500U CN201001191Y (en) | 2007-01-29 | 2007-01-29 | Control circuit for automatic mute main external power amplifier by earphone insertion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200181500U CN201001191Y (en) | 2007-01-29 | 2007-01-29 | Control circuit for automatic mute main external power amplifier by earphone insertion |
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| Publication Number | Publication Date |
|---|---|
| CN201001191Y true CN201001191Y (en) | 2008-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200181500U Expired - Fee Related CN201001191Y (en) | 2007-01-29 | 2007-01-29 | Control circuit for automatic mute main external power amplifier by earphone insertion |
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| CN (1) | CN201001191Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604153A (en) * | 2016-12-20 | 2017-04-26 | 深圳创维－Rgb电子有限公司 | Television horn volume adjusting method and system, and television |
| CN112165587A (en) * | 2020-10-12 | 2021-01-01 | 歌尔科技有限公司 | Method for controlling television audio playing mode by using remote controller and remote controller |
-
2007
- 2007-01-29 CN CNU2007200181500U patent/CN201001191Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604153A (en) * | 2016-12-20 | 2017-04-26 | 深圳创维－Rgb电子有限公司 | Television horn volume adjusting method and system, and television |
| CN106604153B (en) * | 2016-12-20 | 2020-02-07 | 深圳创维－Rgb电子有限公司 | Method and system for adjusting volume of television loudspeaker and television |
| CN112165587A (en) * | 2020-10-12 | 2021-01-01 | 歌尔科技有限公司 | Method for controlling television audio playing mode by using remote controller and remote controller |
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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: 20080102 Termination date: 20110129 |