CN104284273A - Handheld electronic device and corresponding anti-noise earphone - Google Patents
Handheld electronic device and corresponding anti-noise earphone Download PDFInfo
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- CN104284273A CN104284273A CN201310272280.7A CN201310272280A CN104284273A CN 104284273 A CN104284273 A CN 104284273A CN 201310272280 A CN201310272280 A CN 201310272280A CN 104284273 A CN104284273 A CN 104284273A
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Abstract
The invention discloses a handheld electronic device and a corresponding anti-noise earphone. The handheld electronic device comprises the components of: a connecting interface which is provided with a first pin, a second pin and a third pin, wherein the first pin is used for transmitting first loudspeaker signals, and the second pin is used for transmitting second loudspeaker signals; a first impedance unit which is electrically connected between the second pin and power voltage; a second impedance unit which is electrically connected between the second pin and a reference level; a voltage supply unit which is electrically connected with the third pin; and a fundamental frequency circuit which is electrically connected with the second pin, the third pin and the voltage supply unit, and is used for determining whether an earphone is electrically connected with the connecting interface according to voltage change on the second pin. The handheld electronic device according to the invention can identify type of the earphone and furthermore can provide an operating power supply which is required by an anti-noise circuit of the anti-noise earphone. Furthermore the anti-noise earphone of the invention does not require any battery.
Description
Technical field
The invention belongs to portable electric device field, especially include about operating voltage can be provided to the portable electric device of the anti-noise circuit of anti-noise earphone, and do not need the anti-noise earphone adopting any battery.
background technology
Anti-noise earphone, owing to can eliminate extraneous environmental noise, thus can allow user can enjoy music when not improving too much volume, or helps passenger's sleep of aircraft, train, bus etc.So anti-noise earphone is subject to liking of consumer gradually.
But, because existing anti-noise earphone all needs to adopt battery to power to the anti-noise circuit of its inside, cause the volume of existing anti-noise earphone and weight all much larger than volume and the weight of general earphone, thus cause the inconvenience that user uses.
Summary of the invention
The object of the present invention is to provide a kind of portable electric device, it includes connecting interface, the first impedance unit, the second impedance unit, voltage feeding unit and baseband circuit.Described connecting interface has the first pin, the second pin and the 3rd pin, and wherein the first pin is used for transmission first loud speaker signal, and the second pin is used for transmission second loud speaker signal.Described first impedance unit is electrically connected between the second pin and supply voltage.Described second impedance unit is electrically connected between the second pin and reference potential.Described voltage feeding unit is electrically connected the 3rd pin.As for described baseband circuit, it is electrically connected the second pin, the 3rd pin and voltage feeding unit.This baseband circuit is used for according to the change in voltage on the second pin and has judged whether that an earphone is electrically connected to above-mentioned connecting interface, and when being judged as YES, baseband circuit just control voltage feeding unit provides the first voltage to the 3rd pin, and judges the kind of above-mentioned earphone according to the voltage swing on the 3rd pin.And when baseband circuit judges that above-mentioned earphone is an anti-noise earphone and portable electric device opens the anti-noise function of this anti-noise earphone, baseband circuit just control voltage feeding unit provides the second voltage to the 3rd pin, the second voltage is used as the operating power of the anti-noise circuit in above-mentioned anti-noise earphone.
The present invention separately provides a kind of anti-noise earphone corresponding to above-mentioned portable electric device.This anti-noise earphone includes connecting interface, the first switching circuit, switch control unit, call microphone, the first loud speaker, the second loud speaker, the first anti-noise microphone, the second anti-noise microphone and anti-noise circuit.Described connecting interface is used for being electrically connected portable electric device, and this connecting interface has the first pin, the second pin and the 3rd pin, and wherein the first pin is used for reception first loud speaker signal, and the second pin is used for reception second loud speaker signal.Described first switching circuit has first end, the second end, the 3rd end and the first control end, wherein first end is electrically connected the 3rd pin, and the first switching circuit is used for according to the voltage swing received by the first control end and determines above-mentioned first end to be electrically connected to above-mentioned second end, or above-mentioned first end is electrically connected to above-mentioned 3rd end.Described switch control unit is electrically connected the 3rd pin and above-mentioned first control end, and the voltage swing be used on foundation the 3rd pin and control the first switching circuit and its first end is electrically connected to its second end, or its first end is electrically connected its 3rd end.Described call microphone is electrically connected above-mentioned second end.Described first loud speaker is electrically connected the first pin.Described second loud speaker is electrically connected the second pin.As for described anti-noise circuit, it is electrically connected above-mentioned 3rd end, the first loud speaker, the second loud speaker, the first anti-noise microphone and the second anti-noise microphone.
The invention provides the another kind of anti-noise earphone corresponding to above-mentioned portable electric device.This anti-noise earphone includes connecting interface, switching circuit, switch control unit, call microphone, the first loud speaker, the second loud speaker, the first anti-noise microphone, the second anti-noise microphone and anti-noise circuit.Described connecting interface is used for being electrically connected portable electric device, and this connecting interface has the first pin, the second pin and the 3rd pin, and wherein the first pin is used for reception first loud speaker signal, and the second pin is used for reception second loud speaker signal.Described switching circuit has first end, the second end and control end, wherein first end is electrically connected the 3rd pin, control end is used for receiving comparative result, and switching circuit is used for according to the voltage swing on its control end and determines whether above-mentioned first end is electrically connected to above-mentioned second end.Described switch control unit is electrically connected the 3rd pin and above-mentioned control end, and is used for according to the voltage swing on the 3rd pin and determines whether its first end is electrically connected to its second end by control switch circuit.Described call microphone is electrically connected the 3rd pin.Described first loud speaker is electrically connected the first pin.Described second loud speaker is electrically connected the second pin.As for described anti-noise circuit, it is electrically connected above-mentioned second end, the first loud speaker, the second loud speaker, the first anti-noise microphone and the second anti-noise microphone.
Portable electric device of the present invention mainly includes connecting interface, voltage feeding unit and baseband circuit.When an earphone be electrically connected so far portable electric device time, baseband circuit just differentiates the kind of this earphone further by the operation of control voltage feeding unit, and when this earphone is anti-noise earphone, baseband circuit just provides operating power to anti-noise earphone by the operation of control voltage feeding unit further.In addition, corresponding anti-noise earphone includes connecting interface, at least one switching circuit, switch control unit, call microphone, two loud speakers, an anti-noise circuit and two anti-noise microphones, and does not need to adopt any battery.
Accompanying drawing explanation
Fig. 1 be painted with according to the portable electric device of one embodiment of the invention inside main circuit and there is the inside main circuit of general earphone of call microphone.
Fig. 2 is the inside main circuit of general earphone being painted with inside main circuit according to the portable electric device of one embodiment of the invention and not tool call microphone.
Fig. 3 is the inside main circuit being painted with the inside main circuit according to the portable electric device of one embodiment of the invention and the anti-noise earphone according to one embodiment of the invention.
Fig. 4 be painted with according to the portable electric device of another embodiment of the present invention inside main circuit and there is the inside main circuit of general earphone of call microphone.
Fig. 5 is the inside main circuit of general earphone being painted with inside main circuit according to the portable electric device of another embodiment of the present invention and not tool call microphone.
Fig. 6 is the inside main circuit being painted with the inside main circuit according to the portable electric device of another embodiment of the present invention and the anti-noise earphone according to another embodiment of the present invention.
[symbol description]
100,500: portable electric device
110,210,310,410,510,610,710,810: connecting interface
112,114,116,212,214,216,312,314,316,412,414,416,512,514,516,612,614,616,712,714,716,812,814,816: pin
120,122,124,126,128,426,428,520,522,524,526,820: impedance unit
130,530: operating voltage supply circuit
140,150,160,430,432,540,550,824: switching circuit
170,560: baseband circuit
118,518: voltage feeding unit
200,300,400,600,700,800: earphone
240,434,640,826: the impedance of call microphone
220,230,320,330,436,438,620,630,720,730,828,830: loud speaker
420,422,424,822: voltage comparator circuit
440,442,832,834: anti-noise microphone
444,836: anti-noise circuit
418,818: switch control unit
CS1, CS2, CS3: control signal
MIC_BIAS: microphone bias voltage
SPO1, SPO2: loud speaker signal
V_MSMP: supply voltage
VSS: reference potential
Vset: default voltage
V1, V2, V3, V4, Va, Vb, Vc: voltage
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 be painted with according to the portable electric device of one embodiment of the invention inside main circuit and there is the inside main circuit of general earphone of call microphone.In FIG, namely mark 100 represents described portable electric device, mark 200 then represent described in earphone.As shown in Figure 1, this portable electric device 100 includes connecting interface 110, impedance unit 120, impedance unit 122, voltage feeding unit 118 and baseband circuit 170.Connecting interface 110 has pin 112, pin 114 and pin 116, and wherein pin 112 is used for transmitting loud speaker signal SPO1, and pin 114 is used for transmitting loud speaker signal SPO2.Impedance unit 120 is electrically connected between pin 114 and supply voltage V_MSMP, and impedance unit 122 is electrically connected between pin 114 and reference potential VSS.Voltage feeding unit 118 is electrically connected pin 116.As for described baseband circuit 170, it is electrically connected pin 114, pin 116 and voltage feeding unit 118.
In this instance, baseband circuit 170 is used for according to the change in voltage on pin 114 and has judged whether that an earphone is electrically connected to connecting interface 110, when being judged as YES, baseband circuit 170 just control voltage feeding unit 118 provides voltage V1 to pin 116, and judges the kind of above-mentioned earphone according to the voltage swing on pin 116.When baseband circuit 170 judges that above-mentioned earphone is an anti-noise earphone and portable electric device 100 opens the anti-noise function of this anti-noise earphone, baseband circuit 170 just control voltage feeding unit 118 provides voltage V3 to pin 116, voltage V3 is used as the operating power of the anti-noise circuit in above-mentioned anti-noise earphone.In addition, in this instance, when baseband circuit 170 judges that above-mentioned earphone is anti-noise earphone and portable electric device 100 does not open the anti-noise function of this anti-noise earphone, baseband circuit 170 just control voltage feeding unit 118 first provides voltage V2 to pin 116, then control voltage feeding unit 118 stops supply voltage V2 and changes into providing voltage V4 (its method of supplying will in rear explanation) to pin 116, voltage V4 to be used as the operating power of the call microphone of anti-noise earphone.In addition, when baseband circuit 170 judge above-mentioned earphone have call microphone and be not anti-noise earphone time, baseband circuit 170 just provides microphone bias voltage MIC_BIAS, and microphone bias voltage MIC_BIAS is converted to voltage V4 and is provided to pin 116 by control voltage feeding unit 118, voltage V4 to be used as the operating power of the call microphone of above-mentioned earphone.Below by the implementation of detailed description voltage feeding unit 118 and the detailed operation of baseband circuit 170.
As shown in Figure 1, in this instance, voltage feeding unit 118 includes operating voltage supply circuit 130, switching circuit 140, impedance unit 124, impedance unit 126, impedance unit 128, switching circuit 150 and switching circuit 160.Operating voltage supply circuit 130 is used for receiving and controls signal CS1, and determines whether output services voltage V3 accordingly.Switching circuit 140 has first input end, the second input, the first output, the second output and control end, and the first input end of switching circuit 140, the second input and control end are used for receiving microphone bias voltage MIC_BIAS, operating voltage V3 and controlling signal CS1 respectively.This switching circuit 140 is used for determining according to controlling signal CS1 to export microphone bias voltage MIC_BIAS from its first output, or from its second output output services voltage V3.Impedance unit 124 is electrically connected between the first output of switching circuit 140 and pin 116, and is used for producing voltage V4.Wherein one end of impedance unit 126 is electrically connected the second output of switching circuit 140, and wherein one end of impedance unit 128 is also electrically connected the second output of switching circuit 140.
Switching circuit 150 has first input end, the second input, output and control end, and the first input end of switching circuit 150 and the second input are electrically connected the other end of impedance unit 126 and the other end of impedance unit 128 respectively, and the control end of switching circuit 150 is used for receiving control signal CS3.This switching circuit 150 is used for according to controlling signal CS3 and determine to export the voltage received by its first input end, or exports its voltage received by the second input.Switching circuit 160 has first input end, the second input, output and control end, and the first input end of switching circuit 160 and the second input are electrically connected the second output of switching circuit 140 and the output of switching circuit 150 respectively, the output of switching circuit 160 is electrically connected pin 116, and the control end of switching circuit 160 is used for receiving control signal CS2.This switching circuit 160 is used for according to controlling signal CS2 and determine to export the voltage received by its first input end, or exports its voltage received by the second input.
In addition, in this instance, baseband circuit 170 is also used to provide above-mentioned microphone bias voltage MIC_BIAS, controls signal CS1, controls signal CS2 and control signal CS3.In this instance, impedance unit 120 ~ 128 can realize with a resistance separately, and so this is not used for limiting the present invention.It is noted that the resistance of impedance unit 124 ~ 128 needs difference.
In addition, as shown in Figure 1, earphone 200 includes connecting interface 210, loud speaker 220, loud speaker 230 and call microphone (do not show, but to mark 240 to represent its impedance).Connecting interface 210 is used for being electrically connected the connecting interface 110 of portable electric device 100, this connecting interface 210 has pin 212, pin 214 and pin 216, wherein pin 212 is used for receiving loud speaker signal SPO1, and pin 214 is used for receiving loud speaker signal SPO2.
When earphone 200 is electrically connected to portable electric device 100, baseband circuit 170 just detects peripheral earphone event by the change in voltage on pin 114 occurs.Therefore, baseband circuit 170 just can control operating voltage supply circuit 130 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 140 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 170 also can carry out control switch circuit 150 and exports voltage received by its first input end by controlling signal CS3, and carrys out control switch circuit 160 export voltage received by its second input by controlling signal CS2.Thus, the voltage V1 received by first input end of switching circuit 150 is just sent to the call microphone of earphone 200 by switching circuit 150, switching circuit 160, pin 116 and pin 216.And due to call microphone there is impedance 240, therefore baseband circuit 170 just can judge according to the voltage swing on pin 116 this earphone 200 be have call microphone general earphone.
Then, baseband circuit 170 just can export microphone bias voltage MIC_BIAS, and carrys out control switch circuit 140 from its first output output microphone bias voltage MIC_BIAS by controlling signal CS1.Thus, voltage V4 is just sent to the call microphone of earphone 200 by pin 116 and pin 216, and this call microphone can normally be worked.
Fig. 2 is the inside main circuit of general earphone being painted with inside main circuit according to the portable electric device of one embodiment of the invention and not tool call microphone.In fig. 2, mark person identical with the mark in Fig. 1 and be expressed as identical object or signal, in addition, namely mark 300 represents described earphone.As shown in Figure 2, earphone 300 includes connecting interface 310, loud speaker 320 and loud speaker 330.Connecting interface 310 is used for being electrically connected the connecting interface 110 of portable electric device 100, this connecting interface 310 has pin 312, pin 314 and pin 316, wherein pin 312 is used for receiving loud speaker signal SPO1, and pin 314 is used for receiving loud speaker signal SPO2.
When earphone 300 is electrically connected to portable electric device 100, baseband circuit 170 just detects peripheral earphone event by the change in voltage on pin 114 occurs.Therefore, baseband circuit 170 just can control operating voltage supply circuit 130 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 140 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 170 also can carry out control switch circuit 150 and exports voltage received by its first input end by controlling signal CS3, and carrys out control switch circuit 160 export voltage received by its second input by controlling signal CS2.Thus, voltage V1 is just sent to earphone 300 by switching circuit 150, switching circuit 160, pin 116 and pin 316.Because wherein one end of pin 316 is electrically connected reference potential VSS, therefore baseband circuit 170 just can judge according to the voltage swing on pin 116 that this earphone 300 to be conversed the general earphone of microphone for not tool.
In addition, due to the general earphone that earphone 300 is not tool call microphone, therefore baseband circuit 170 can not export microphone bias voltage MIC_BIAS, and baseband circuit 170 also can control operating voltage supply circuit 130 further by control signal CS1 stops output services voltage V3.
Fig. 3 is the inside main circuit being painted with the inside main circuit according to the portable electric device of one embodiment of the invention and the anti-noise earphone according to one embodiment of the invention.In figure 3, mark person identical with the mark in Fig. 1 and be expressed as identical object or signal, in addition, namely mark 400 represents described anti-noise earphone.As shown in Figure 3, anti-noise earphone 400 includes connecting interface 410, switching circuit 432, switch control unit 418, call microphone (do not show, but to mark 434 to represent its impedance), loud speaker 436, loud speaker 438, anti-noise microphone 440, anti-noise microphone 442 and anti-noise circuit 444.Connecting interface 410 is used for being electrically connected the connecting interface 110 of portable electric device 100, this connecting interface 410 has pin 412, pin 414 and pin 416, wherein pin 412 is used for receiving loud speaker signal SPO1, and pin 414 is used for receiving loud speaker signal SPO2.In this instance, impedance unit 426 and 428 can realize with a resistance separately, and so this is not used for limiting the present invention.Switching circuit 432 has first end, the second end, the 3rd end and control end, and the first end of switching circuit 432 is electrically connected pin 416.This switching circuit 432 is used for according to the voltage swing received by its control end and determines its first end to be electrically connected to its second end, or its first end is electrically connected to its 3rd end.
In addition, in this instance, switch control unit 418 is electrically connected the control end of pin 416 and switching circuit 432, and is used for according to the voltage swing on pin 416 that its first end is electrically connected to its second end by control switch circuit 432, or its first end is electrically connected its 3rd end.This switch control unit 418 includes voltage comparator circuit 420, voltage comparator circuit 422, voltage comparator circuit 424, impedance unit 426, impedance unit 428 and switching circuit 430.Voltage comparator circuit 420 has first input end, the second input and output, and the first input end of voltage comparator circuit 420 is electrically connected pin 416, and the second input is used for receiver voltage Va.This voltage comparator circuit 420 is used for comparing the size of voltage on pin 416 and voltage Va, exports the first comparative result from its output.Voltage comparator circuit 422 has first input end, the second input and output, and the first input end of voltage comparator circuit 422 is electrically connected pin 416, and the second input is used for receiver voltage Vb.This voltage comparator circuit 422 is used for comparing the size of voltage on pin 416 and voltage Vb, exports the second comparative result from its output.Voltage comparator circuit 424 has first input end, the second input and output, and the first input end of voltage comparator circuit 424 is electrically connected pin 416, and the second input is used for receiver voltage Vc.This voltage comparator circuit 424 is used for comparing the size of voltage on pin 416 and voltage Vc, exports the 3rd comparative result from its output.
Wherein one end of impedance unit 426 is electrically connected the output of voltage comparator circuit 420, and wherein one end of impedance unit 428 is electrically connected the output of voltage comparator circuit 422.Switching circuit 430 has first end, the second end and control end, and the first end of switching circuit 430 is electrically connected the other end of impedance unit 426 and the other end of impedance unit 428, second end of switching circuit 430 is electrically connected reference potential VSS, and the control end of switching circuit 430 is used for reception the 3rd comparative result.This switching circuit 430 is used for according to the 3rd comparative result and determines whether its first end is electrically connected to its second end.
In addition, the call microphone (to mark 434 to represent its impedance) of anti-noise earphone 400 is electrically connected the second end of switching circuit 432.Loud speaker 436 is electrically connected pin 412, and loud speaker 438 is electrically connected pin 414.As for anti-noise circuit 444, it is electrically connected the 3rd end of switching circuit 432, loud speaker 436, loud speaker 438, anti-noise microphone 440 and anti-noise microphone 442.
In this instance, voltage comparator circuit 420 ~ 424 can realize with a comparator (comparator) separately, and the first input end of each voltage comparator circuit realizes with the positive input terminal of comparator, and the second input of each voltage comparator circuit realizes with the negative input end of comparator.But this is only used to citing, be not used for limiting the present invention.In addition, in this instance, impedance unit 426 and 428 can realize with a resistance separately, so this also non-be used for limit the present invention.It is noted that in this instance, the relation between following voltage is as follows:
V3>Vc >V2>Vb>V1Great T.GreaT.GTVa, and Vc>V4>Vb.
In addition, in this instance, when switching circuit 432 control end received by voltage to present logic high punctual, its first end is just electrically connected to its second end by switching circuit 432; Otherwise, when switching circuit 432 control end received by voltage to present logic low level punctual, its first end is just electrically connected to its 3rd end by switching circuit 432.In this instance, switching circuit 432 is given tacit consent to its first end is electrically connected to its 3rd end.In addition, when switching circuit 430 control end received by voltage to present logic high punctual, its first end is just electrically connected to its second end and presents conducting state (turned on state) by switching circuit 430; Otherwise, when switching circuit 430 control end received by voltage to present logic low level punctual, switching circuit 430 just presents closed condition (turned off state).
When earphone 400 is electrically connected to portable electric device 100, baseband circuit 170 just detects peripheral earphone event by the change in voltage on pin 114 occurs.Therefore, baseband circuit 170 just can control operating voltage supply circuit 130 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 140 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 170 also can carry out control switch circuit 150 and exports voltage received by its first input end by controlling signal CS3, and carrys out control switch circuit 160 export voltage received by its second input by controlling signal CS2.Thus, the voltage V1 received by first input end of switching circuit 150 is just sent to the pin 416 of earphone 400 by switching circuit 150, switching circuit 160 and pin 116.
Due to Vc>Vb>V1>Va, make the first comparative result only having voltage comparator circuit 420 to export present logic high standard, the comparative result that other voltage comparator circuits export then all presents logic low level.But, because the output of now voltage comparator circuit 420 is by its internal circuit ground connection, makes the voltage received by the control end of switching circuit 432 present logic low level, and then make switching circuit 432 will be electrically connected to its 3rd end by its first end.Thus, voltage V1 just can be sent to anti-noise circuit 444.And also there is impedance due to anti-noise circuit 444 itself, therefore baseband circuit 170 just can judge according to the voltage swing on pin 116 that this earphone 400 is as an anti-noise earphone.
Then, whether baseband circuit 170 can be opened the anti-noise function of anti-noise earphone 400 according to portable electric device 100 and determine it is to export microphone bias voltage MIC_BIAS, to provide the operating power needed for call microphone further, or operating voltage supply circuit 130 output services voltage V3 to be controlled, the operating power needed for anti-noise circuit 444 is provided further.Why have such operation, telephone operation and anti-noise mainly will be avoided to operate and interfere with each other.
When portable electric device 100 does not open the anti-noise function of anti-noise earphone 400, baseband circuit 170 just can control operating voltage supply circuit 130 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 140 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 170 also can carry out control switch circuit 150 and exports voltage received by its second input by controlling signal CS3, and carrys out control switch circuit 160 export voltage received by its second input by controlling signal CS2.Thus, voltage V2 is just sent to pin 416 by switching circuit 150, switching circuit 160 and pin 116.Due to Vc>V2>Vb>Va, the second comparative result that the first comparative result that voltage comparator circuit 420 is exported and voltage comparator circuit 422 export all presents logic high standard, the 3rd comparative result that voltage comparator circuit 444 exports then presents logic low level and makes switching circuit 430 present closed condition, therefore the voltage received by control end of switching circuit 432 presents logic high standard, and then makes switching circuit 432 that its first end is electrically connected to its second end.
Then, baseband circuit 170 just can export microphone bias voltage MIC_BIAS, and control operating voltage supply circuit 130 stop output services voltage V3 by controlling signal CS1, carry out control switch circuit 140 and export microphone bias voltage MIC_BIAS by controlling signal CS1 from its first output again simultaneously.Thus, voltage V4 is just sent to pin 416 by pin 116.And due to Vc>V4>Vb, the second comparative result that the first comparative result that voltage comparator circuit 420 is exported and voltage comparator circuit 422 export all presents logic high standard, the 3rd comparative result that voltage comparator circuit 444 exports then presents logic low level and makes switching circuit 430 present closed condition, therefore the voltage received by control end of switching circuit 432 still can present logic high standard, and then makes switching circuit 432 continue its first end to be electrically connected to its second end.Thus, voltage V4 just can be transferred into the call microphone of anti-noise earphone 400, is used as its operating power, and then call microphone can normally be used.Certainly, still can inspect portable electric device 100 after baseband circuit 170 at any time and whether have the anti-noise function opening anti-noise earphone 400.
When portable electric device 100 opens the anti-noise function of anti-noise earphone 400, baseband circuit 170 just can not export microphone bias voltage MIC_BIAS, but baseband circuit 170 can control operating voltage supply circuit 130 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 140 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 170 also can carry out control switch circuit 160 from its output output services voltage V3 by controlling signal CS2.Thus, voltage V3 is just sent to pin 416 by pin 116.
Due to V3>Vc>Vb>Va, the second comparative result that the first comparative result that voltage comparator circuit 420 is exported, voltage comparator circuit 422 export and the 3rd comparative result that voltage comparator circuit 424 exports all present logic high standard.And due to switching circuit 430 accurate and its first end is electrically connected to its second end because voltage that its control end receives presents logic high, the voltage received by the control end of switching circuit 432 is made to present logic low level, therefore, its first end just can be electrically connected to its 3rd end by switching circuit 432.Thus, voltage V3 just can be transferred into anti-noise circuit 444, is used as its operating power, and then makes anti-noise circuit 444 can normal running.
In the process of anti-noise circuit 444 normal running, whether baseband circuit 170 still can inspect portable electric device 100 at any time the call function opening anti-noise earphone 400.When portable electric device 100 opens the call function of anti-noise earphone 400, baseband circuit 170 just can distinguish the operation of control switch circuit 150 and 160 again by controlling signal CS3 and CS2, to change, voltage V2 is sent to pin 416, and then makes switching circuit 432 that its first end is electrically connected to its second end.Then, baseband circuit 170 can export microphone bias voltage MIC_BIAS, and control operating voltage supply circuit 130 stop output services voltage V3 by controlling signal CS1, and carry out control switch circuit 140 from its first output output microphone bias voltage MIC_BIAS by controlling signal CS1, and then voltage V4 is sent to the call microphone of anti-noise earphone 400.Certainly, in the operating process of call microphone, baseband circuit 170 still can inspect the call function (namely terminating call) whether portable electric device 100 closes anti-noise earphone 400 at any time.Once portable electric device 100 closes the call function of anti-noise earphone 400, so baseband circuit 170 just can stop exporting microphone bias voltage MIC_BIAS, and again control operating voltage supply circuit 130 output services voltage V3 by controlling signal CS1, and distinguish the operation of control switch circuit 140 and 160 by controlling signal CS1 and CS2, again voltage V3 is sent to anti-noise circuit 444.
From illustrating above, portable electric device of the present invention can the pattern of identifying earphone, and initiatively can provide the operating power needed for anti-noise circuit of anti-noise earphone, and anti-noise earphone of the present invention does not then need to adopt any battery.
Fig. 4 be painted with according to the portable electric device of another embodiment of the present invention inside main circuit and there is the inside main circuit of general earphone of call microphone.In the diagram, namely mark 500 represents described portable electric device, mark 600 then represent described in earphone.And as shown in Figure 4, this portable electric device 500 includes connecting interface 510, impedance unit 520, impedance unit 522, voltage feeding unit 518 and baseband circuit 560.Connecting interface 510 has pin 512, pin 514 and pin 516, and wherein pin 512 is used for transmitting loud speaker signal SPO1, and pin 514 is used for transmitting loud speaker signal SPO2.Impedance unit 520 is electrically connected between pin 514 and supply voltage V_MSMP, and impedance unit 522 is electrically connected between pin 514 and reference potential VSS.Voltage feeding unit 518 is electrically connected pin 516.As for described baseband circuit 560, it is electrically connected pin 514, pin 516 and voltage feeding unit 518.
In this instance, baseband circuit 560 is used for according to the change in voltage on pin 514 and has judged whether that an earphone is electrically connected to connecting interface 510, and when being judged as YES, baseband circuit 560 just control voltage feeding unit 518 provides voltage V1 to pin 516, and judges the kind of above-mentioned earphone according to the voltage swing on pin 516.And when baseband circuit 560 judges that above-mentioned earphone is an anti-noise earphone and portable electric device 500 opens the anti-noise function of this anti-noise earphone, baseband circuit 560 just control voltage feeding unit 518 provides voltage V3 to pin 516, voltage V3 to be used as the operating power of the anti-noise circuit in above-mentioned anti-noise earphone.In addition, in this instance, when baseband circuit 560 judges that above-mentioned earphone is anti-noise earphone and portable electric device 500 does not open the anti-noise function of this anti-noise earphone, baseband circuit 560 just provides microphone bias voltage MIC_BIAS, and microphone bias voltage is turned MIC_BIAS by control voltage feeding unit 518 is changed to voltage V4 and is provided to pin 516, voltage V4 is used as the operating power of the call microphone of anti-noise earphone.In addition, when baseband circuit 560 judge above-mentioned earphone as have call microphone and be not anti-noise earphone time, baseband circuit 560 just provides microphone bias voltage MIC_BIAS, and microphone bias voltage MIC_BIAS is converted to voltage V4 and is provided to pin 516 by control voltage feeding unit 518, voltage V4 to be used as the operating power of the call microphone of above-mentioned earphone.Below by the implementation of detailed description voltage feeding unit 518 and the detailed operation of baseband circuit 560.
As shown in Figure 4, in this instance, voltage feeding unit 518 includes operating voltage supply circuit 530, switching circuit 540, impedance unit 524, impedance unit 526 and switching circuit 550.Operating voltage supply circuit 530 is used for receiving and controls signal CS1, and determines whether output services voltage V3 accordingly.Switching circuit 540 has first input end, the second input, the first output, the second output and control end, and wherein first input end, the second input and control end are used for receiving microphone bias voltage MIC_BIAS, operating voltage V3 and controlling signal CS1 respectively.This switching circuit 540 is used for determining according to controlling signal CS1 to export microphone bias voltage MIC_BIAS from its first output, or from its second output output services voltage V3.Impedance unit 524 is electrically connected between the first output of switching circuit 540 and pin 516, and is used for producing voltage V4.Wherein one end of impedance unit 526 is electrically connected the second output of switching circuit 540.Switching circuit 550 has first input end, the second input, output and control end, wherein the first input end of switching circuit 550 and the second input are electrically connected the second output of switching circuit 540 and the other end of impedance unit 526 respectively, the output of switching circuit 550 is electrically connected 516 pins, and the control end of switching circuit 550 is used for receiving control signal CS2.This switching circuit 550 is used for according to controlling signal CS2 and determine to export the voltage received by its first input end, or exports its voltage received by the second input.
In addition, in this instance, baseband circuit 560 is more used to provide above-mentioned microphone bias voltage MIC_BIAS, controls signal CS1 and control signal CS2.In this instance, impedance unit 520 ~ 526 can realize with a resistance separately, and so this is not used for limiting the present invention.It is noted that impedance unit 524 from 526 resistance need different.
In addition, as shown in Figure 4, earphone 600 includes connecting interface 610, loud speaker 620, loud speaker 630 and call microphone (do not show, but to mark 640 to represent its impedance).Connecting interface 610 is used for being electrically connected the connecting interface 510 of portable electric device 500, this connecting interface 610 has pin 612, pin 614 and pin 616, wherein pin 612 is used for receiving loud speaker signal SPO1, and pin 614 is used for receiving loud speaker signal SPO2.
When earphone 600 is electrically connected to portable electric device 500, baseband circuit 560 just detects peripheral earphone event by the change in voltage on pin 514 occurs.Therefore, baseband circuit 560 just can control operating voltage supply circuit 530 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 540 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 170 also can carry out control switch circuit 550 and exports voltage received by its second input by controlling signal CS2.Thus, the voltage V1 received by the second input of switching circuit 550 is just sent to the call microphone of earphone 600 by switching circuit 550, pin 516 and pin 616.And due to call microphone there is impedance 640, therefore baseband circuit 560 just can judge according to the voltage swing on pin 516 this earphone 600 as have call microphone general earphone.
Then, baseband circuit 560 just can export microphone bias voltage MIC_BIAS, and control operating voltage supply circuit 530 stop output services voltage V3 by controlling signal CS1, and carry out control switch circuit 540 and export microphone bias voltage MIC_BIAS by controlling signal CS1 from its first output.Thus, voltage V4 is just sent to the call microphone of earphone 600 by pin 516 and pin 616, and this call microphone can normally be worked.
Fig. 5 is the inside main circuit of general earphone being painted with inside main circuit according to the portable electric device of another embodiment of the present invention and not tool call microphone.In Figure 5, mark person identical with the mark in Fig. 4 and be expressed as identical object or signal, in addition, namely mark 700 represents described earphone.As shown in Figure 5, earphone 700 includes connecting interface 710, loud speaker 720 and loud speaker 730.Connecting interface 710 is used for being electrically connected the connecting interface 510 of portable electric device 500, this connecting interface 710 has pin 712, pin 714 and pin 716, wherein pin 712 is used for receiving loud speaker signal SPO1, and pin 714 is used for receiving loud speaker signal SPO2.
When earphone 700 is electrically connected to portable electric device 500, baseband circuit 560 just detects peripheral earphone event by the change in voltage on pin 514 occurs.Therefore, baseband circuit 560 just can control operating voltage supply circuit 530 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 540 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 560 also can carry out control switch circuit 550 and exports voltage received by its second input by controlling signal CS2.Thus, voltage V1 is just sent to earphone 700 by switching circuit 550, pin 516 and pin 716.Because wherein one end of pin 716 is electrically connected reference potential VSS, therefore baseband circuit 560 just can judge according to the voltage swing on pin 516 that this earphone 700 to be conversed the general earphone of microphone for not tool.
In addition, due to the general earphone that earphone 700 is not tool call microphone, therefore baseband circuit 560 can not export microphone bias voltage MIC_BIAS, and baseband circuit 560 also can control operating voltage supply circuit 130 further by control signal CS1 stops output services voltage V3.
Fig. 6 is the inside main circuit being painted with the inside main circuit according to the portable electric device of another embodiment of the present invention and the anti-noise earphone according to another embodiment of the present invention.In figure 6, mark person identical with the mark in Fig. 4 and be expressed as identical object or signal, in addition, namely mark 800 represents described anti-noise earphone.As shown in Figure 6, anti-noise earphone 800 includes connecting interface 810, switching circuit 824, switch control unit 818, call microphone (do not show, but to mark 826 to represent its impedance), loud speaker 828, loud speaker 830, anti-noise microphone 832, anti-noise microphone 834 and anti-noise circuit 836.
Connecting interface 810 is used for being electrically connected the connecting interface 510 of portable electric device 500, this connecting interface 810 has pin 812, pin 814 and pin 816, wherein pin 812 is used for receiving loud speaker signal SPO1, and pin 814 is used for receiving loud speaker signal SPO2.Switching circuit 824 has first end, the second end and control end, and wherein the first end of switching circuit 824 is electrically connected pin 816.This switching circuit 824 is used for according to the voltage on its control end and determines whether its first end is electrically connected to its second end.Switch control unit 818 is electrically connected the control end of pin 816 and switching circuit 824, and is used for according to the voltage swing on pin 816 and determines whether its first end is electrically connected to its second end by control switch circuit 824.
This switch control unit 418 includes impedance unit 820 and voltage comparator circuit 822.Impedance unit 820 is electrically connected between pin 816 and reference potential VSS.Voltage comparator circuit 822 has first input end, the second input and output, and wherein the first input end of voltage comparator circuit 822 is electrically connected pin 816, and the second input of voltage comparator circuit 822 is used for receiving default voltage Vset.This voltage comparator circuit 822 is used for comparing the size of voltage on pin 816 and default voltage Vset, exports comparative result from its output.In this instance, impedance unit 820 can adopt a resistance to realize, and so this is not used for limiting the present invention.
Call microphone (to mark 826 to represent its impedance) is electrically connected pin 816.Loud speaker 828 is electrically connected pin 812, and loud speaker 830 is electrically connected pin 814.As for described anti-noise circuit 836, it is electrically connected the second end of switching circuit 824, loud speaker 828, loud speaker 830, anti-noise microphone 832 and anti-noise microphone 834.
In this instance, voltage comparator circuit 822 also can adopt a comparator to realize, and the first input end of voltage comparator circuit 822 realizes with the positive input terminal of comparator, and the second input of voltage comparator circuit 822 realizes with the negative input end of comparator.But this is only used to citing, be not used for limiting the present invention.It is noted that in this instance, the relation between following voltage is as follows:
V3>V1>Vset, and Vset>V4.
In addition, in this instance, when switching circuit 824 control end received by voltage to present logic high punctual, its first end is just electrically connected to its second end and presents conducting state by switching circuit 824; Otherwise, when switching circuit 824 control end received by voltage to present logic low level punctual, switching circuit 824 just presents closed condition.
When earphone 800 is electrically connected to portable electric device 500, baseband circuit 560 just detects peripheral earphone event by the change in voltage on pin 514 occurs.Therefore, baseband circuit 560 just can control operating voltage supply circuit 530 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 540 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 560 also can carry out control switch circuit 550 and exports voltage received by its second input by controlling signal CS2.Thus, the voltage V1 received by the second input of switching circuit 550 is just sent to the pin 816 of earphone 800 by switching circuit 550 and pin 516.
Due to V1>Vset, the comparative result that voltage comparator circuit 822 is exported presents logic high standard, and then makes switching circuit 824 that its first end is electrically connected to its second end.Thus, voltage V1 just can be sent to anti-noise circuit 836.So because voltage V1 does not reach the operating voltage of anti-noise circuit 836, therefore anti-noise circuit 836 can not normal running.And also there is impedance due to anti-noise circuit 836 itself, and impedance unit 820 itself also has resistance, therefore baseband circuit 560 just can judge according to the voltage swing on pin 516 that this earphone 800 is as an anti-noise earphone.
Then, whether baseband circuit 560 can be opened the anti-noise function of anti-noise earphone 800 according to portable electric device 500 and determine it is to export microphone bias voltage MIC_BIAS, to provide the operating power needed for call microphone further, or operating voltage supply circuit 530 output services voltage V3 to be controlled, to provide the operating power needed for anti-noise circuit 836 further.Why having such operation, is also mainly telephone operation and anti-noise will be avoided to operate interfere with each other.
When portable electric device 500 does not open the anti-noise function of anti-noise earphone 800, baseband circuit 560 just can export microphone bias voltage MIC_BIAS, and control operating voltage supply circuit 130 stop output services voltage V3 by controlling signal CS1, and carry out control switch circuit 540 and export microphone bias voltage MIC_BIAS by controlling signal CS1 from its first output.Thus, voltage V4 is just sent to pin 816 by pin 516.Due to Vset>V4, the comparative result system that voltage comparator circuit 822 is exported presents logic low level and makes switching circuit 824 present closed condition, therefore voltage V4 just can be transferred into the call microphone of anti-noise earphone 800, to be used as its operating power, and then call microphone can normally be used.Certainly, still can inspect portable electric device 500 after baseband circuit 560 at any time and whether have the anti-noise function opening anti-noise earphone 800.
When portable electric device 500 opens the anti-noise function of anti-noise earphone 800, baseband circuit 560 just can not export microphone bias voltage MIC_BIAS, but baseband circuit 560 can control operating voltage supply circuit 530 output services voltage V3 by controlling signal CS1, and carrys out control switch circuit 540 from its second output output services voltage V3 by controlling signal CS1.In addition, baseband circuit 560 also can carry out control switch circuit 550 from its output output services voltage V3 by controlling signal CS2.Thus, voltage V3 is just sent to pin 816 by pin 516.
Due to V3>V1>Vset, the comparative result that voltage comparator circuit 822 is exported presents logic high standard, and then makes switching circuit 824 its first end is electrically connected to its second end and present conducting state.Thus, voltage V3 just can be transferred into anti-noise circuit 836, to be used as its operating power, and then makes anti-noise circuit 836 can normal running.
In the process of anti-noise circuit 836 normal running, whether baseband circuit 560 still can inspect portable electric device 500 at any time the call function opening anti-noise earphone 800.When portable electric device 500 opens the call function of anti-noise earphone 800, baseband circuit 560 just can export microphone bias voltage MIC_BIAS, and operating voltage supply circuit 130 can be controlled stop output services voltage V3 by controlling signal CS1, and carry out control switch circuit 540 from its first output output microphone bias voltage MIC_BIAS by controlling signal CS1, and then voltage V4 is sent to the call microphone of anti-noise earphone 800.Certainly, in the operating process of call microphone, baseband circuit 560 still can inspect the call function (namely terminating call) whether portable electric device 500 closes anti-noise earphone 800 at any time.Once portable electric device 500 closes the call function of anti-noise earphone 800, so baseband circuit 560 just can stop exporting microphone bias voltage MIC_BIAS, and again control operating voltage supply circuit 530 output services voltage V3 by controlling signal CS1, and distinguish the operation of control switch circuit 540 and 550 by controlling signal CS1 and CS2, again voltage V3 is sent to anti-noise circuit 836.
From illustrating above, portable electric device of the present invention can the pattern of identifying earphone, and initiatively can provide the operating power needed for anti-noise circuit of anti-noise earphone, and anti-noise earphone of the present invention does not then need to adopt any battery.
In sum, portable electric device of the present invention mainly includes connecting interface, voltage feeding unit and baseband circuit.When an earphone be electrically connected so far portable electric device time, baseband circuit just differentiates the kind of this earphone further by the operation of control voltage feeding unit, and when this earphone is anti-noise earphone, baseband circuit just provides operating power to anti-noise earphone by the operation of control voltage feeding unit further.In addition, corresponding anti-noise earphone includes connecting interface, at least one switching circuit, switch control unit, call microphone, two loud speakers, an anti-noise circuit and two anti-noise microphones, and does not need to adopt any battery.
Claims (15)
1. a portable electric device, is characterized in that, comprising:
One connecting interface, has one first pin, one second pin and one the 3rd pin, and wherein this first pin is used for transmission one first loud speaker signal, and this second pin is used for transmission one second loud speaker signal;
One first impedance unit, is electrically connected between this second pin and a supply voltage;
One second impedance unit, is electrically connected between this second pin and a reference potential;
One voltage feeding unit, is electrically connected the 3rd pin; And
One baseband circuit, be electrically connected this second pin, 3rd pin and this voltage feeding unit, and be used for according to the change in voltage on this second pin and judged whether that an earphone is electrically connected to this connecting interface, and when being judged as YES, this baseband circuit controls this voltage feeding unit provides one first voltage to the 3rd pin, and the kind of this earphone is judged according to the voltage swing on the 3rd pin, and when this baseband circuit judges that this earphone is an anti-noise earphone and this portable electric device opens an anti-noise function of this anti-noise earphone, this baseband circuit just controls this voltage feeding unit provides one second voltage to the 3rd pin, this second voltage to be used as the operating power of the anti-noise circuit in this anti-noise earphone.
2. portable electric device as claimed in claim 1, it is characterized in that: wherein when this baseband circuit judges that this earphone is this anti-noise earphone and this portable electric device does not open this anti-noise function of this anti-noise earphone, this baseband circuit controls this voltage feeding unit first provides a tertiary voltage to the 3rd pin, then controlling this voltage feeding unit stops for should tertiary voltage and change into and provide one the 4th voltage to the 3rd pin, the 4th voltage to be used as the operating power of a call microphone of this anti-noise earphone.
3. portable electric device as claimed in claim 2, it is characterized in that: wherein when this baseband circuit judge this earphone as there is a call microphone and be not this anti-noise earphone time, this baseband circuit provides a microphone bias voltage, and control this voltage feeding unit and this microphone bias voltage is converted to the 4th voltage and is provided to the 3rd pin, the 4th voltage is used as the operating power of this call microphone of this earphone.
4. portable electric device as claimed in claim 3, is characterized in that: described voltage feeding unit comprises:
One operating voltage supply circuit, being used for reception one first controls signal, and determines whether export an operating voltage according to this;
One first switching circuit, there is a first input end, one second input, one first output, one second output and one first control end, this first input end, this second input and this first control end be used for respectively reception one microphone bias voltage, this operating voltage and this first control signal, and this first switching circuit is used for according to this first control signal and determines to export this microphone bias voltage from this first output, or export this operating voltage from this second output;
One the 3rd impedance unit, is electrically connected between this first output and the 3rd pin, and is used for producing the 4th voltage;
One the 4th impedance unit, its one end is electrically connected this second output;
One the 5th impedance unit, its one end is electrically connected this second output;
One second switch circuit, there is one the 3rd input, a four-input terminal, one the 3rd output and one second control end, 3rd input and this four-input terminal are electrically connected the other end of the 4th impedance unit and the other end of the 5th impedance unit respectively, and this second control end be used for reception one second control signal, and this second switch circuit is used for according to this second control signal and determines to export the voltage received by the 3rd input, to be used as this first voltage, or export this voltage received by four-input terminal, to be used as this tertiary voltage; And
One the 3rd switching circuit, there is one the 5th input, one the 6th input, one the 4th output and one the 3rd control end, 5th input and the 6th input are electrically connected this second output and the 3rd output respectively, 4th output is electrically connected the 3rd pin, and the 3rd control end be used for reception 1 the 3rd control signal, and the 3rd switching circuit is used for controlling signal according to the 3rd and determining to export the voltage received by the 5th input, to be used as this second voltage, or the voltage exported received by the 6th input
Wherein this baseband circuit is more used to provide this microphone bias voltage, first controls signal, this second control signal and the 3rd controls signal for this.
5. portable electric device as claimed in claim 4, is characterized in that: described first impedance unit, this second impedance unit, the 3rd impedance unit, the 4th impedance unit and the 5th impedance unit are all a resistance.
6. portable electric device as claimed in claim 1, it is characterized in that: wherein when this baseband circuit judges that this earphone is this anti-noise earphone and this portable electric device does not open this anti-noise function of this anti-noise earphone, this baseband circuit provides a microphone bias voltage, and control this voltage feeding unit and this microphone bias voltage is converted to a tertiary voltage and is provided to the 3rd pin, this tertiary voltage to be used as the operating power of a call microphone of this anti-noise earphone.
7. portable electric device as claimed in claim 6, it is characterized in that: wherein when this baseband circuit judge this earphone as there is a call microphone and be not this anti-noise earphone time, this baseband circuit provides this microphone bias voltage, and control this voltage feeding unit and this microphone bias voltage is converted to this tertiary voltage and is provided to the 3rd pin, this tertiary voltage to be used as the operating power of this call microphone of this earphone.
8. portable electric device as claimed in claim 7, is characterized in that: wherein this voltage feeding unit comprises:
One operating voltage supply circuit, being used for reception one first controls signal, and determines whether export an operating voltage according to this;
One first switching circuit, there is a first input end, one second input, one first output, one second output and one first control end, this first input end, this second input and this first control end be used for respectively reception one microphone bias voltage, this operating voltage and this first control signal, and this first switching circuit is used for according to this first control signal and determines to export this microphone bias voltage from this first output, or export this operating voltage from this second output;
One the 3rd impedance unit, is electrically connected between this first output and the 3rd pin, and is used for producing this tertiary voltage;
One the 4th impedance unit, its one end is electrically connected this second output;
One second switch circuit, there is one the 3rd input, one four-input terminal, one the 3rd output and one second control end, 3rd input and this four-input terminal are electrically connected the other end of this second output and the 4th impedance unit respectively, 3rd output is electrically connected the 3rd pin, and this second control end be used for reception one second control signal, and this second switch circuit is used for according to this second control signal and determines to export the voltage received by the 3rd input, to be used as this second voltage, or export this voltage received by four-input terminal, to be used as this first voltage,
Wherein this baseband circuit is electrically connected this second pin and the 3rd pin, and be more used to provide this microphone bias voltage, this first controls signal and this second controls signal.
9. portable electric device as claimed in claim 8, is characterized in that: wherein this first impedance unit, this second impedance unit, the 3rd impedance unit and the 4th impedance unit are all a resistance.
10. an anti-noise earphone, is characterized in that, comprising:
One connecting interface, be used for being electrically connected handheld electronic device, this connecting interface has one first pin, one second pin and one the 3rd pin, and wherein this first pin is used for reception one first loud speaker signal, and this second pin is used for reception one second loud speaker signal;
One first switching circuit, there is a first end, one second end, one the 3rd end and one first control end, this first end is electrically connected the 3rd pin, and this first switching circuit is used for according to the voltage swing received by this first control end and determines this first end to be electrically connected to this second end, or this first end is electrically connected to the 3rd end;
One switch control unit, be electrically connected the 3rd pin and this first control end, and be used for controlling this first switching circuit according to the voltage swing on the 3rd pin by this first end and be electrically connected to this second end, or this first end is electrically connected the 3rd end;
One call microphone, is electrically connected this second end;
One first loud speaker, is electrically connected this first pin;
One second loud speaker, is electrically connected this second pin;
One first anti-noise microphone;
One second anti-noise microphone; And
One anti-noise circuit, is electrically connected the 3rd end, this first loud speaker, this second loud speaker, this first anti-noise microphone and this second anti-noise microphone.
11. anti-noise earphones as claimed in claim 10, it is characterized in that, wherein this switch control unit comprises:
One first voltage comparator circuit, there is a first input end, one second input and one first output, this first input end is electrically connected the 3rd pin, this second input is used for reception one first voltage, and this first voltage comparator circuit is used for comparing the size of voltage on the 3rd pin and this first voltage, to export one first comparative result from this first output;
One second voltage comparator circuit, there is one the 3rd input, a four-input terminal and one second output, 3rd input is electrically connected the 3rd pin, this four-input terminal is used for reception one second voltage, and this second voltage comparator circuit is used for comparing the size of voltage on the 3rd pin and this second voltage, to export one second comparative result from this second output;
One tertiary voltage comparison circuit, there is one the 5th input, one the 6th input and one the 3rd output, 5th input is electrically connected the 3rd pin, 6th input is used for reception one tertiary voltage, and this tertiary voltage comparison circuit is used for comparing the size of voltage on the 3rd pin and this tertiary voltage, to export one the 3rd comparative result from the 3rd output;
One first impedance unit, its one end is electrically connected this first output;
One second impedance unit, its one end is electrically connected this second output; And
One second switch circuit, there is one the 4th end, a five terminal and one second control end, 4th end is electrically connected the other end of this first impedance unit and the other end of this second impedance unit, this five terminal is electrically connected a reference potential, this second control end is used for receiving the 3rd comparative result, and this second switch circuit is used for according to the 3rd comparative result and determines whether this first end is electrically connected to this second end.
12. anti-noise earphones as claimed in claim 11, is characterized in that: wherein this first impedance unit and this second impedance unit are all a resistance.
13. 1 anti-noise earphones, is characterized in that, comprising:
One connecting interface, be used for being electrically connected handheld electronic device, this connecting interface has one first pin, one second pin and one the 3rd pin, and wherein this first pin is used for reception one first loud speaker signal, and this second pin is used for reception one second loud speaker signal;
One switching circuit, there is a first end, one second end and a control end, this first end is electrically connected the 3rd pin, and this control end is used for receiving this comparative result, and this switching circuit is used for according to the voltage swing on its control end and determines whether this first end is electrically connected to this second end;
One switch control unit, is electrically connected the 3rd pin and this control end, and is used for determining whether control this switching circuit according to the voltage swing on the 3rd pin by this first end and is electrically connected to this second end;
One call microphone, is electrically connected the 3rd pin;
One first loud speaker, is electrically connected this first pin;
One second loud speaker, is electrically connected this second pin;
One first anti-noise microphone;
One second anti-noise microphone; And
One anti-noise circuit, is electrically connected this second end, this first loud speaker, this second loud speaker, this first anti-noise microphone and this second anti-noise microphone.
14. anti-noise earphones as claimed in claim 13, it is characterized in that, wherein this switch control unit comprises:
One impedance unit, is electrically connected between the 3rd pin and a reference potential; And
One voltage comparator circuit, there is a first input end, one second input and one first output, this first input end is electrically connected the 3rd pin, this second input is used for reception one default voltage, and this voltage comparator circuit is used for comparing the size of voltage on the 3rd pin and this default voltage, to export a comparative result from this first output, and control this switching circuit according to this and whether this first end is electrically connected to this second end.
15. anti-noise earphones as claimed in claim 14, is characterized in that: wherein this impedance unit is a resistance.
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| CN106559724B (en) * | 2015-09-30 | 2020-03-24 | 展讯通信（上海）有限公司 | Circuit and method for eliminating earphone plugging noise |
| CN106792343A (en) * | 2015-11-19 | 2017-05-31 | 展讯通信（上海）有限公司 | A kind of head circuit and electronic equipment |
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| Publication number | Publication date |
|---|---|
| CN104284273B (en) | 2018-03-30 |
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