CN103024632A - Noise reduction device of earphone - Google Patents
Noise reduction device of earphone Download PDFInfo
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- CN103024632A CN103024632A CN2012105863107A CN201210586310A CN103024632A CN 103024632 A CN103024632 A CN 103024632A CN 2012105863107 A CN2012105863107 A CN 2012105863107A CN 201210586310 A CN201210586310 A CN 201210586310A CN 103024632 A CN103024632 A CN 103024632A
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Abstract
The invention discloses a noise reduction device of an earphone. The noise reduction device of the earphone comprises an earphone socket and a control circuit, and the earphone socket comprises a detection switch arranged at the bottom of the earphone socket. When an earphone plug is plugged into the earphone socket and the top of the earphone plug is in contact with the detection switch, the detection switch transmits a first signal to the control circuit; when the earphone plug is pulled out of the earphone socket and the top of the earphone plug is separated from the detection switch, the detection switch transmits a second signal to the control circuit; when the earphone plug is not plugged into the earphone socket, the control circuit controls a power amplifier of audio equipment to be in a mute state; when receiving the first signal transmitted by the detection switch, the control circuit controls microphone bias voltage of the earphone socket to be stabilized at first, and then the power amplifier of the audio equipment is turned into a playing state; and when receiving the second signal transmitted by the detection switch, the control circuit controls the power amplifier of the audio equipment to be turned into the mute state, and the microphone bias voltage is stabilized. According to the technical scheme, the noise reduction device has the advantages that a burst sound producing period of the earphone socket is prevented, the practicality is greatly improved, and the comfortable degree is greatly increased.
Description
Technical field
The present invention relates to earphone noise reduction technology field, particularly a kind of earphone denoising device.
Background technology
Existing earphone socket the has been simple realization exact connect ion of each terminal of plug and socket, although sense switch has sent earphone and has inserted signal during use, but be not each terminal and the state of the respective electrode contact stabilization in the headset plug in the earphone socket this moment, the satisfied measuring ability that inserts fully; When headset plug was extracted, sense switch does not also detect extracted operation, and each terminal in the earphone socket and the respective electrode in the headset plug just disconnect, and sense switch can not be accomplished the effect that detects in advance.And existing earphone socket is not processed the plug noise, in the headset plug insertion process, the connection of Mike's terminal and Mike's electrode can cause the moment level sudden change from high to low of Mike's bias voltage, in the headset plug withdrawal process, sudden change from low to high can occur in Mike's bias voltage, although this jump signal duration is very short, outputs to earphone after monitoring amplifying circuit, thereby produce ear-piercing plosive, it is not good to be that the user experiences.Below be that prior art is produced the analysis that plosive reason is carried out:
Fig. 1 is the schematic diagram that earphone plug plosive produces in the prior art.Mike's electrode 501 of 1 headset plug cooperates with Mike's terminal 303 of earphone socket in the drawings, and the grounding electrode 502 of headset plug cooperates with the earth terminal 304 of earphone socket.Referring to Fig. 1, the headset plug insertion process, it is the process that Mike's electrode 501 of headset plug among Fig. 1 cooperates with Mike's terminal 303 of earphone socket, the process that the grounding electrode 502 of headset plug cooperates with the earth terminal 502 of earphone socket, in this process, Mike's terminal 303 of earphone socket and Mike's electrode 501 of headset plug also reliably do not contact, continue this moment to insert and to cause the sense switch action, monitoring amplifying circuit is in the normal operation, do not satisfy and insert measuring ability fully, the withdrawal process of headset plug, be Mike's electrode 501 of the headset plug among Fig. 1 and the process of Mike's terminal 303 disconnections of earphone socket, the process that the grounding electrode 502 of headset plug and the earth terminal of earphone socket 304 disconnect, in this process, Mike's terminal 303 did not just disconnect with Mike's electrode 501 when sense switch also detected the dial-out operation, sense switch does not have the effect that detects in advance, thereby can produce plug noise shown in Figure 1, the plug noise forms plosive by the amplification of the power amplifier 103 of audio frequency apparatus.
Usually the signal of microphone generating is very faint generally about 10mV, and the plosive signal generally can reach 1000mV, although the equipment of therefore not taking measures output to the plosive time of earphone very short can be very ear-piercing.
Summary of the invention
In view of the above problems, the present invention has been proposed in order to a kind of a kind of earphone denoising device that overcomes the problems referred to above or address the above problem at least in part is provided.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of earphone denoising device, described this device comprises earphone socket and control circuit, and described earphone socket comprises sense switch; Described sense switch is arranged at the bottom of described earphone socket; The input of described control circuit links to each other with sense switch; The output of described control circuit links to each other with the quiet control port of the power amplifier of audio frequency apparatus;
When the headset plug that cooperates with described earphone socket inserts described earphone socket, and the top of headset plug is when touching described sense switch, and described sense switch sends first signal to control circuit; When described headset plug is extracted described earphone socket, and the top of described headset plug is when separating with described sense switch, and described sense switch sends secondary signal to control circuit;
Control circuit is used for when described headset plug does not insert described earphone socket, and the power amplifier of control audio frequency apparatus is in mute state; Be used for when receiving the first signal of sense switch transmission, Mike's bias voltage of controlling described earphone socket rises to rated value and stable by zero first, transfers tone playing state to behind the power amplifier of audio frequency apparatus; Be used for when receiving the secondary signal of sense switch transmission, the power amplifier of control audio frequency apparatus transfers first mute state to, is returned to zero by rated value behind Mike's bias voltage.
Alternatively, described sense switch comprises: the first sense switch terminal and the second sense switch terminal;
Wherein the first sense switch terminal maintains static, and the second sense switch terminal is movable;
When described sense switch was touched at the top of described headset plug, the second sense switch terminal separated with the first sense switch terminal;
When separated with described sense switch at the top of described headset plug, the second sense switch terminal and the first sense switch terminal merged.
Alternatively, described earphone socket also comprises: Mike's terminal;
Described Mike's terminal extends to the insertion port near earphone socket.
Alternatively, described earphone socket also comprises: earth terminal and sound channel terminal; Wherein, the grounding electrode of described earth terminal and headset plug cooperates; The sound channel electrode of described sound channel terminal and headset plug cooperates; Mike's electrode of Mike's terminal and headset plug cooperates.
Alternatively, described Mike's terminal, earth terminal, sound channel terminal, the first sense switch terminal and the second sense switch terminal are shell fragment.
Alternatively, described control circuit comprises Mike's bias voltage control circuit and power amplification control circuit.
Alternatively, described Mike's bias voltage control circuit comprises resistance six, PNP triode one, power supply four, electric capacity five, resistance four and resistance eight;
One end of resistance six links to each other with an end of resistance eight, the other end ground connection of resistance eight, and the tie point between resistance six and the resistance eight also is used for being connected with Mike's terminal of described earphone socket; The other end of resistance six links to each other with the collector electrode of PNP triode one; The emitter of PNP triode one links to each other with the positive pole of power supply four, the minus earth of power supply four; The ground level of PNP triode one links to each other with an end of electric capacity five, the other end ground connection of electric capacity five; The ground level of PNP triode one also links to each other with the other end of resistance four; The other end of resistance four is used for linking to each other with the sense switch of earphone socket, and the other end of resistance four also links to each other with an end of power amplification control circuit.
Alternatively, described power amplification control circuit comprises: resistance two, electric capacity four, NPN triode two, resistance 12, resistance one, electric capacity one, NPN triode four, resistance three, resistance seven, resistance 11 and power supply one; One end of resistance two links to each other with the other end of resistance four, and an end of resistance two also links to each other with an end of resistance 12, and an end of resistance two also links to each other with an end of resistance one; The other end of resistance 12 links to each other with an end of resistance seven, and the other end of resistance seven links to each other with the collector electrode of NPN triode two, and the base stage of NPN triode two links to each other with the other end of resistance one; The other end of resistance one also links to each other with an end of electric capacity one, the other end ground connection of electric capacity one; The other end of resistance 12 also links to each other with the positive pole of power supply one, the minus earth of power supply one; The other end of resistance 12 also links to each other with an end of resistance 11, and the other end of resistance 11 links to each other with an end of resistance three, the other end ground connection of resistance three, and the other end of resistance 11 also links to each other with the collector electrode of NPN triode four; Tie point between the collector electrode of NPN triode four and the resistance three is used for connecing the quiet control end of power amplifier of audio frequency apparatus; The grounded emitter of NPN triode four; The base stage of NPN triode four links to each other with the other end of resistance two; The base stage of NPN triode four also links to each other with an end of electric capacity four, an end ground connection of electric capacity four; The base stage of NPN triode four also links to each other with the emitter of NPN triode two.
Alternatively, described electric capacity four has identical capacitance with electric capacity five; The capacitance of electric capacity one is much smaller than electric capacity four; The resistance of resistance two is greater than resistance four; The resistance of resistance seven is less than resistance four;
Each electric capacity discharges when headset plug inserts, and NPN triode two ends first, the one secondly conducting of PNP triode, NPN triode four final coutoffs;
Each electric capacity charges when headset plug is extracted, the two first conductings of NPN triode, the four secondly conductings of NPN triode, PNP triode one final coutoff.
Alternatively, described electric capacity four and electric capacity five capacitances are 10 μ F; The capacitance of electric capacity one is 100nF; The resistance of resistance two is 500K Ω; The resistance of resistance four is the resistance 1K Ω of 100K Ω, resistance seven.
The sense switch of this technical scheme redesign earphone socket of the present invention and the position of Mike's terminal, after in the headset plug insertion process, making the respective electrode contact stabilization of each terminal of headset plug and earphone socket, make again the sense switch action, send the first signal that plug inserts fully to control circuit; Make first the sense switch action in the dial-out process, each terminal that sends earphone socket after the secondary signal of transfering to prompting to control circuit disconnects respectively with each electrode of headset plug again, so that the operating state of the power amplifier of the first signal that control circuit is sent according to sense switch or secondary signal control audio frequency apparatus, thereby avoided the plosive emergence period, greatly improved user's comfort.
Description of drawings
Fig. 1 is the schematic diagram that earphone plug plosive produces in the prior art;
Fig. 2 is the theory diagram that the embodiment of the invention is eliminated earphone plug noise;
Fig. 3 is the top view structure chart of the standard level Four earphone socket of the embodiment of the invention;
Fig. 4 is the side-looking structure chart of the standard level Four earphone socket of the embodiment of the invention;
Fig. 5 is each electrode schematic diagram of standard headphone plug of the embodiment of the invention;
Fig. 6 is the circuit theory diagrams of the control circuit of embodiment of the invention earphone socket.
Embodiment
Problem based on the plosive described in the background technology produces has proposed technical solution of the present invention, and the condition that earphone socket should satisfy in technical scheme of the present invention is:
In the plug insertion process, behind each terminal elder generation in the earphone socket and the respective electrode contact stabilization of headset plug, sense switch moves again, namely in the plug insertion process sense switch operate time want sluggish in earphone socket other terminals and the time of the respective electrode contact stabilization of headset plug;
In the plug withdrawal process, the sense switch of earphone socket moves first, other terminals in the earphone socket disconnect with the respective electrode of headset plug again, i.e. the time of the in advance terminal of other in earphone socket and the respective electrode disconnection of headset plug sense switch operate time in the plug withdrawal process.
When not using equipment signalling channel is closed, in the earphone insertion process, wait the electrode contact of each terminal of the complete earphone socket of noise producing and headset plug stable after opening signal passage again;
Know in advance namely noise will occur, then shutoff signal passage at once.
Based on the condition that the technical solution of the present invention of above-mentioned proposition should satisfy, technical scheme of the present invention is:
Sense switch extends to direction of insertion, strengthens the distance between sense switch and the Mike's terminal;
Suitably increase the length of Mike's terminal, reach the Mike's electrode that contacts in advance headset plug when inserting, sense switch moves again, and sense switch moves first during dial-out, the effect that Mike's electrode of headset plug disconnects with Mike's terminal of earphone socket again;
The parameter of electric capacity and resistance in the design control circuit, so that headset plug is before insertion process, the power amplifier of control circuit control audio frequency apparatus is in mute state; Headset plug plugged earphone socket, and when touching sense switch, during the sense switch action, Mike's bias voltage of control circuit control earphone socket rises to rated value and stable by zero first, transfer tone playing state to behind the power amplifier of audio frequency apparatus, and the power amplifier of audio frequency apparatus is in the time lag of tone playing state in the time of plug noise producing; Headset plug is transferred to earphone socket, and during the sense switch action, the power amplifier of control circuit control audio frequency apparatus transfers first mute state to, is returned to zero by rated value behind Mike's bias voltage.
Particularly, a kind of earphone denoising device disclosed by the invention, this device comprises earphone socket and control circuit, earphone socket comprises sense switch; Sense switch is arranged at the bottom (being the end of earphone socket) of earphone socket; The input of control circuit links to each other with sense switch; The output of control circuit links to each other with the quiet control port of the power amplifier of audio frequency apparatus; When the headset plug plugged earphone socket that cooperates with earphone socket, and the top of headset plug is when touching sense switch, and sense switch sends first signal to control circuit; When headset plug is extracted earphone socket, and the top of headset plug is when separating with sense switch, and sense switch sends secondary signal to control circuit; Control circuit, be used for when headset plug does not insert described earphone socket, the power amplifier of control audio frequency apparatus is in mute state, be used for when receiving the first signal of sense switch transmission, Mike's bias voltage elder generation of control earphone socket rises to rated value and stable by zero, transfers tone playing state to behind the power amplifier of audio frequency apparatus, is used for when receiving the secondary signal of sense switch transmission, the power amplifier of control audio frequency apparatus transfers first mute state to, is returned to zero by rated value behind Mike's bias voltage and stablizes.
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Referring to Fig. 2, eliminate the theory diagram of earphone plug noise for the embodiment of the invention.
Referring to Fig. 2, the earphone denoising device in the embodiment of the invention comprises earphone socket 200 and control circuit 202.Earphone socket 200 comprises sense switch 201; Sense switch 201 is arranged at the bottom of earphone socket 200; The input of control circuit 202 links to each other with sense switch 201; The output of control circuit 202 links to each other with the power amplifier of audio frequency apparatus 103; When the headset plug 204 plugged earphone sockets 200 that cooperate with earphone socket 200, and the top of headset plug 204 is when touching described sense switch 201, and sense switch 201 sends first signals for control circuit 202; When headset plug 204 is extracted earphone socket, and the top of headset plug 204 is when separating with sense switch 201, and sense switch 201 sends secondary signals for control circuit 202; Control circuit 202 is used at headset plug 204 not during plugged earphone socket 200, and the power amplifier 103 of control audio frequency apparatus is in mute state; Be used for when receiving the first signal of sense switch 201 transmissions, Mike's bias voltage of control earphone socket 200 rises to rated value by zero first and stablizes, and transfers tone playing state to behind the power amplifier 103 of audio frequency apparatus; Be used for opening 201 when closing the secondary signal that sends receiving to detect, the power amplifier 103 of control audio frequency apparatus transfers first mute state to, is returned to zero stable behind Mike's bias voltage by rated value.In an embodiment of the present invention, control circuit 202 links to each other with the quiet control port of the power amplifier 103 of audio frequency apparatus.
Because sense switch places the bottom of earphone socket in the embodiment of the invention, thereby in the headset plug insertion process, other terminals can contact with the respective electrode of headset plug first, in the process of the respective electrode contact stabilization of other terminals of earphone socket and headset plug, can cause the sudden change of bias voltage, and then have a plug noise producing, but control circuit makes the power amplifier of audio frequency apparatus be in mute state, although thereby the plug noise producing arranged, but because the power amplifier of audio frequency apparatus is in mute state, so earphone can not heard plosive, subsequently, other terminals of earphone socket and the respective electrode contact stabilization of headset plug, the plug noise disappears, this moment, sense switch sent first signal, in an embodiment of the present invention, this first signal is specially low level signal, control circuit is controlled audio frequency apparatus after receiving this low level signal power amplifier is converted to operating state from mute state, although this moment, earphone can be heard sound, but the plug noise disappears, so can not hear plosive.In the dial-out process, sense switch moves first, send secondary signal and be specially high level signal here to control circuit, control circuit is after receiving this high level signal, the power amplifier of control audio frequency apparatus transfers mute state to from operating state, other terminals of earphone socket disconnect with the respective electrode of headset plug again, the moment that disconnects, can cause the sudden change of bias voltage, and then have the plug noise producing, although this moment the plug noise producing is arranged, because the power amplifier of audio frequency apparatus is in mute state, earphone be can't hear sound, so earphone also be can't hear plosive.
Fig. 3 is the standard level Four earphone socket 200 top view structure charts of the embodiment of the invention.
Referring to Fig. 3, in this earphone socket 200, sense switch comprises: the first sense switch terminal 301 and the second sense switch terminal 302; Wherein the first sense switch terminal 301 maintains static, and the second sense switch end 302 is movable; When sense switch was touched at the top of headset plug, the second sense switch terminal 302 separated with the first sense switch terminal 301; When extracting headset plug, separate with sense switch at the top of headset plug, and the second sense switch terminal 302 and the first sense switch terminal 301 merge.
In an embodiment of the present invention, first signal is low level signal, and secondary signal is high level signal; Under initial condition, the second sense switch terminal 302 and the first sense switch terminal 301 are in merging phase, and this moment, control circuit made the power amplifier of audio frequency apparatus be in mute state.When headset plug 204 inserted, the second sense switch terminal 302 became from merging with the state of the first sense switch terminal 301 and separates, and sense switch 201 actions send low level signals to control circuit 202; When headset plug 204 was transferred to, the second sense switch terminal 302 became merging with the state of the first sense switch terminal 301 from separating, and sense switch 201 actions send high level signal to control circuit 202.
Fig. 4 is the side-looking structure chart of the standard level Four earphone socket 200 of the embodiment of the invention.
Referring to Fig. 3 and Fig. 4, this earphone socket 200 disclosed by the invention also comprises: Mike's terminal 303; Referring to Fig. 4, Mike's terminal 303 extends to the insertion port near earphone socket.Owing to Mike's terminal 303 is extended to the insertion port of close earphone socket, thereby so that when earphone inserts, Mike's electrode of headset plug is stable prior to Mike's termination contact of earphone socket, and sense switch moves again, namely sends low level signal to control circuit; When earphone was extracted, sense switch moved first, namely sent high level signal to control circuit, and Mike's electrode of headset plug is that Mike's terminal of earphone socket disconnects, and has avoided the plosive emergence period, has improved user's comfort.
In this manual, other terminals of the earphone socket of mentioning and the respective electrode contact stabilization of headset plug refer to that mainly Mike's electrode contact of Mike's terminal of earphone socket and headset plug is stable; The meeting of mentioning causes the sudden change of bias voltage, mainly is the sudden change of Mike's bias voltage; Other terminals of earphone socket disconnect with the respective electrode of headset plug again, and the Mike's terminal that mainly refers to earphone socket disconnects with Mike's electrode of headset plug again.
Fig. 5 is each electrode schematic diagram of standard headphone plug of the embodiment of the invention.
Referring to Fig. 3 and Fig. 5, this earphone socket of the embodiment of the invention also comprises: earth terminal 304 and sound channel terminal 305; Wherein, the grounding electrode 502 of earth terminal 304 and headset plug 204 cooperates; The sound channel electrode 503 of sound channel terminal 305 and headset plug 204 cooperates; Mike's electrode 501 of Mike's terminal 303 and headset plug 204 cooperates.In Fig. 5, label 504 is the top of headset plug 204.
Referring to Fig. 3, in this earphone socket, Mike's terminal 303, earth terminal 304, sound channel terminal 305, the first sense switch terminal 301 and the second sense switch terminal 302 are shell fragment.
Fig. 6 is the circuit theory diagrams of the control circuit of embodiment of the invention earphone socket.
Referring to Fig. 6, in the earphone socket of the embodiment of the invention, control circuit comprises Mike's bias voltage control circuit 601 and power amplification control circuit 602.
Referring to Fig. 6, to execute in the control circuit of routine earphone socket in the present invention, Mike's bias voltage control circuit 601 comprises resistance R 6, PNP triode Q1, power supply V4, capacitor C 5 and resistance R 4; One end of resistance R 6 links to each other with an end of resistance R 8, the other end ground connection of resistance R 8, and the tie point between resistance R 6 and the resistance R 8 also is used for being connected with Mike's terminal of earphone socket; The other end of resistance R 6 link to each other with the collector electrode of PNP triode Q1 (node 6 among Fig. 6); The emitter of PNP triode Q1 links to each other with the positive pole of power supply V4 (node 7 among Fig. 6), the minus earth of power supply V4; The ground level of PNP triode Q1 links to each other with an end of capacitor C 5 (node 3 among Fig. 6), the other end ground connection of capacitor C 5; The ground level of PNP triode Q1 also links to each other with the other end of resistance R 4; The other end of resistance R 4 is used for linking to each other with the earphone socket sense switch, here (node 10 among Fig. 6) specifically links to each other with J1A, wherein, J1A is the equivalent switch of headset plug and earphone socket state, when headset plug plugged earphone socket, J1A is closed, and when headset plug was transferred to earphone socket, J1A disconnected; The other end of resistance R 4 also links to each other with an end of power amplification control circuit 602.
Execute in the control circuit of routine earphone socket in the present invention, power amplification control circuit 602 comprises resistance R 2, capacitor C 4, NPN triode Q2, resistance R 12, resistance R 1, capacitor C 1, NPN triode Q4, resistance R 3, resistance R 7, resistance R 11 and power supply V1; One end of resistance R 2 is used for linking to each other with sense switch, and an end of resistance R 2 also links to each other with the other end of resistance R 4, and an end of resistance R 2 also links to each other with an end of resistance R 12, and an end of resistance R 2 also links to each other with an end of resistance R 1; The other end of resistance R 12 links to each other with the end of R7, and the other end of resistance R 7 links to each other with the collector electrode of NPN triode Q2 (node 1 among Fig. 6), and the base stage of NPN triode Q2 links to each other with the other end of resistance R 1; The other end of resistance R 1 also links to each other with an end of capacitor C 1 (node 2 among Fig. 6), the other end ground connection of capacitor C 1; The other end of resistance R 12 also links to each other with the positive pole of power supply V1, the minus earth of power supply V1; The other end of resistance R 12 also link to each other with an end of resistance R 11 (node 5 among Fig. 6), the other end of resistance R 11 links to each other with an end of resistance R 3, the other end ground connection of resistance R 3, the other end of resistance R 11 also link to each other with the collector electrode of NPN triode Q4 (node 4 among Fig. 6); The collector electrode of NPN triode Q4 and the tie point between the resistance R 3 are used for connecing the quiet control end of power amplifier of audio frequency apparatus; The grounded emitter of NPN triode Q4; The base stage of NPN triode Q4 links to each other with the other end of resistance R 2; The base stage of NPN triode Q4 also links to each other with an end of capacitor C 4 (node 9 among Fig. 6), an end ground connection of capacitor C 4; The base stage of NPN triode Q4 also links to each other with the emitter of NPN triode Q2.
In the disclosed this earphone socket of the embodiment of the invention, capacitor C 4 has identical capacitance with capacitor C 5; The capacitance of capacitor C 1 is much smaller than capacitor C 4; The resistance of resistance R 2 is greater than resistance R 4; The resistance of resistance R 7 is much smaller than R4; In the plugged earphone plug process, capacitor C 1, capacitor C 4, capacitor C 5 are when discharge, and NPN triode Q2 ends first, secondly conducting of PNP triode Q1, NPN triode Q4 final coutoff; Transfer in the headset plug process, capacitor C 1, capacitor C 4, capacitor C 5 when charging, the conducting of NPN triode Q2 elder generation, secondly conducting of NPN triode Q4, PNP triode Q1 final coutoff.
In the disclosed this earphone socket of the embodiment of the invention, capacitor C 4 and capacitor C 5 capacitances are 10 μ F; The capacitance of capacitor C 1 is 100nF; The resistance of resistance R 2 is 500K Ω; The resistance of resistance R 4 is 100K Ω, the resistance 1K Ω of resistance R 7, the resistance of resistance R 1 is 200K Ω, the resistance of resistance R 12 is 100K Ω, the resistance of resistance R 11 is 100K Ω, the resistance of resistance R 3 is 190K Ω, and the resistance of resistance R 6 is 3K Ω, and the resistance of resistance R 8 is 5.6K Ω, in Fig. 6, resistance R 5 represents the equivalent resistance of headset plug, and R5 is connected (node 11 among Fig. 6) with J1A, and the resistance of resistance R 5 is 32 Ω, power supply V1 is 5V, power supply V4 is 2V, and the model of NPN triode Q4 and NPN triode Q2 is BC847B, and the model of PNP triode Q1 is BC857C.
In an embodiment of the present invention, during to the quiet port output low level of the power amplifier of audio frequency apparatus, the power amplifier of audio frequency apparatus is in mute state; During to the quiet port output of the power amplifier of audio frequency apparatus high level, the power amplifier of audio frequency apparatus is in running order.
The operation principle of foregoing circuit is as follows:
When headset plug not during the plugged earphone socket, be that J1A disconnects, PNP triode Q1 is in cut-off state, the microphone bias Voltage-output is 0V, NPN triode Q2 and NPN triode Q4 saturation conduction, when NPN triode Q4 saturation conduction, to the quiet port output low level of the power amplifier of audio frequency apparatus, power amplifier is in mute state, if this moment the plugged earphone plug, be that J1A is closed, the plug noise of the unstable contact of each electrode before sense switch sends low level signal since the power amplifier of audio frequency apparatus be in mute state and can't send by power amplifier, and the voltage of each electrode of earphone socket is very little also can not cause friction noise, after the sense switch action, send low level signal to control circuit, each electrode is stable contact, this moment, the electric capacity of each transistor base began discharge, calculate according to the computing formula t=R of time that discharges and recharges of electric capacity * C, when triode discharges, t1=R1 * C1 discharge time of capacitor C 1, (R5 is with respect to R1, R2 and R4 are very little, can ignore) t2=R2 * C4 discharge time of capacitor C 4, t3=R4 * C5 discharge time of capacitor C 5 calculates, capacitor C 1 discharge is the fastest, capacitor C 5 secondly, capacitor C 4 is the slowest, thereby the fastest cut-off of NPN triode Q2, secondly conducting of PNP triode Q1, the slowest conducting of NPN triode Q4, this time missionary society cause Mike's bias voltage stable first after power amplifier normal playback, the plug noise that produces of the fluctuation of Mike's bias voltage also can not exported from the power amplifier of audio frequency apparatus like this.Sense switch sends high level signal during the earphone withdrawal process, this moment, each triode can be recharged, still calculate according to the computing formula t=R of time that discharges and recharges of electric capacity * C, different with the discharge speed, charging interval t1=R1 * the C1 of capacitor C 1, charging interval is the shortest, so capacitor C 1 is full of at first, after the capacitor C 1 of NPN triode Q2 base stage is full of first, NPN triode Q2 conducting, NPN triode Q2 emitter can be given capacitor C 4 quick charges of Q4 base stage place like this, so the time capacitor C 4 charging interval t2=R7 * C4, and the charging interval of capacitor C 5 still is t3=R4 * C5, it is the fastest to calculate capacitor C 1 charging, capacitor C 4 secondly, capacitor C 5 is the slowest, so NPN triode Q2 elder generation conducting, then NPN triode Q4 conducting, last PNP triode Q1 cut-off, this sequential relationship will make that then the power amplifier of audio frequency apparatus is quiet starts first that Mike's bias voltage makes zero again, the plug noise of having avoided the fluctuation of Mike's bias voltage to produce, each electrode of socket is all not charged in the earphone continuation withdrawal process like this, can not produce friction noise yet.
In sum, technical scheme of the present invention has following advantage:
1, because technical scheme of the present invention places sense switch the bottom of earphone socket, and Mike's terminal is extended to the insertion port of close earphone socket, so that headset plug is when inserting, each terminal of earphone socket and the respective electrode of headset plug elder generation contact stabilization, sense switch moves again, and headset plug is when extracting, and sense switch moves first, each terminal of earphone socket disconnects with the respective electrode of headset plug again, has avoided plosive generation.
2, owing to the design of technical scheme of the present invention to electric capacity and the resistance parameter of control circuit, make this circuit after cooperating with sense switch, when earphone inserts, sequential according to the triode conducting is different, so that the first just playback of stable rear power amplifier of Mike's bias voltage when earphone is extracted, makes the quiet first startup of power amplifier, Mike's bias voltage is stable again, has avoided plosive generation.
The above only is this preferred embodiment, is not for limiting protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. an earphone denoising device is characterized in that, described this device comprises earphone socket and control circuit, and described earphone socket comprises sense switch; Described sense switch is arranged at the bottom of described earphone socket; The input of described control circuit links to each other with sense switch; The output of described control circuit links to each other with the quiet control port of the power amplifier of audio frequency apparatus;
When the headset plug that cooperates with described earphone socket inserts described earphone socket, and the top of headset plug is when touching described sense switch, and described sense switch sends first signal to control circuit; When described headset plug is extracted described earphone socket, and the top of described headset plug is when separating with described sense switch, and described sense switch sends secondary signal to control circuit;
Control circuit is used for when described headset plug does not insert described earphone socket, and the power amplifier of control audio frequency apparatus is in mute state; Be used for when receiving the first signal of sense switch transmission, Mike's bias voltage of controlling described earphone socket rises to rated value and stable by zero first, transfers tone playing state to behind the power amplifier of audio frequency apparatus; Be used for when receiving the secondary signal of sense switch transmission, the power amplifier of control audio frequency apparatus transfers first mute state to, is returned to zero by rated value behind Mike's bias voltage.
2. device according to claim 1 is characterized in that, described sense switch comprises: the first sense switch terminal and the second sense switch terminal;
Wherein the first sense switch terminal maintains static, and the second sense switch terminal is movable;
When described sense switch was touched at the top of described headset plug, the second sense switch terminal separated with the first sense switch terminal;
When separated with described sense switch at the top of described headset plug, the second sense switch terminal and the first sense switch terminal merged.
3. device according to claim 2 is characterized in that, described earphone socket also comprises: Mike's terminal;
Described Mike's terminal extends to the insertion port near earphone socket.
4. device according to claim 3 is characterized in that, described earphone socket also comprises: earth terminal and sound channel terminal; Wherein, the grounding electrode of described earth terminal and headset plug cooperates; The sound channel electrode of described sound channel terminal and headset plug cooperates; Mike's electrode of Mike's terminal and headset plug cooperates.
5. device according to claim 4 is characterized in that, described Mike's terminal, earth terminal, sound channel terminal, the first sense switch terminal and the second sense switch terminal are shell fragment.
6. device according to claim 1 is characterized in that, described control circuit comprises Mike's bias voltage control circuit and power amplification control circuit.
7. device according to claim 6 is characterized in that, described Mike's bias voltage control circuit comprises resistance six, PNP triode one, power supply four, electric capacity five, resistance four and resistance eight;
One end of resistance six links to each other with an end of resistance eight, the other end ground connection of resistance eight, and the tie point between resistance six and the resistance eight also is used for being connected with Mike's terminal of described earphone socket; The other end of resistance six links to each other with the collector electrode of PNP triode one; The emitter of PNP triode one links to each other with the positive pole of power supply four, the minus earth of power supply four; The ground level of PNP triode one links to each other with an end of electric capacity five, the other end ground connection of electric capacity five; The ground level of PNP triode one also links to each other with the other end of resistance four; The other end of resistance four is used for linking to each other with the sense switch of earphone socket, and the other end of resistance four also links to each other with an end of power amplification control circuit.
8. device according to claim 7, it is characterized in that described power amplification control circuit comprises: resistance two, electric capacity four, NPN triode two, resistance 12, resistance one, electric capacity one, NPN triode four, resistance three, resistance seven, resistance 11 and power supply one; One end of resistance two links to each other with the other end of resistance four, and an end of resistance two also links to each other with an end of resistance 12, and an end of resistance two also links to each other with an end of resistance one; The other end of resistance 12 links to each other with an end of resistance seven, and the other end of resistance seven links to each other with the collector electrode of NPN triode two, and the base stage of NPN triode two links to each other with the other end of resistance one; The other end of resistance one also links to each other with an end of electric capacity one, the other end ground connection of electric capacity one; The other end of resistance 12 also links to each other with the positive pole of power supply one, the minus earth of power supply one; The other end of resistance 12 also links to each other with an end of resistance 11, and the other end of resistance 11 links to each other with an end of resistance three, the other end ground connection of resistance three, and the other end of resistance 11 also links to each other with the collector electrode of NPN triode four; Tie point between the collector electrode of NPN triode four and the resistance three is used for connecing the quiet control end of power amplifier of audio frequency apparatus; The grounded emitter of NPN triode four; The base stage of NPN triode four links to each other with the other end of resistance two; The base stage of NPN triode four also links to each other with an end of electric capacity four, an end ground connection of electric capacity four; The base stage of NPN triode four also links to each other with the emitter of NPN triode two.
9. device according to claim 8 is characterized in that,
Described electric capacity four has identical capacitance with electric capacity five; The capacitance of electric capacity one is much smaller than electric capacity four; The resistance of resistance two is greater than resistance four; The resistance of resistance seven is less than resistance four;
Each electric capacity discharges when headset plug inserts, and NPN triode two ends first, the one secondly conducting of PNP triode, NPN triode four final coutoffs;
Each electric capacity charges when headset plug is extracted, the two first conductings of NPN triode, the four secondly conductings of NPN triode, PNP triode one final coutoff.
10. device according to claim 9 is characterized in that,
Described electric capacity four and electric capacity five capacitances are 10 μ F; The capacitance of electric capacity one is 100nF; The resistance of resistance two is 500K Ω; The resistance of resistance four is the resistance 1K Ω of 100K Ω, resistance seven.
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| CN201210586310.7A CN103024632B (en) | 2012-12-30 | 2012-12-30 | A kind of noise reduction device of earphone |
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| CN201210586310.7A CN103024632B (en) | 2012-12-30 | 2012-12-30 | A kind of noise reduction device of earphone |
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| CN103024632A true CN103024632A (en) | 2013-04-03 |
| CN103024632B CN103024632B (en) | 2016-06-01 |
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