CN105187992A - Microphone switch control circuit and method - Google Patents
Microphone switch control circuit and method Download PDFInfo
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- CN105187992A CN105187992A CN201510617194.4A CN201510617194A CN105187992A CN 105187992 A CN105187992 A CN 105187992A CN 201510617194 A CN201510617194 A CN 201510617194A CN 105187992 A CN105187992 A CN 105187992A
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Abstract
The present invention provides a microphone switch control circuit and method. The microphone switch control circuit is arranged on an earphone, the earphone includes a microphone and a switch. The control circuit includes a first logical circuit and a second logical circuit. The first end of the microphone is connected with the input end of the second logical circuit and the first end of the switch, the output end of the second logical circuit and the second end of the switch are each connected to the input end of the first logical circuit, the second end of the microphone and the output end of the first logical circuit are earthed together. The AC signal of signals outputted by the microphone is controlled in the state of short circuit to earth and the DC signal of signals outputted by the microphone is controlled in the state of open circuit to earth when the switch is closed. The electrical level too-fast change of signals outputted by the microphone is restrained when the switch is in the change state between on and off. The microphone switch control circuit can realize mute and can not be identified as a mute key for long press by a control terminal at the same time so that the possible misoperation of the control terminal is avoided and the explosive noise in the moment of on or off of the switch can be efficiently restrained. The microphone switch control circuit has the simple implementation program and low cost.
Description
Technical field
The present invention relates to electronic device field, particularly a kind of microphone switch control circuit and method.
Background technology
The current design for ear microphone switch mainly contains two kinds of modes:
First kind of way: define special mute button, by operation mute button, carries out the quiet of software respective channel by MCU/Codec (micro-control unit/coder).
This mode controls to carry out quiet and stopping mute operation accordingly by software timing, can effectively suppress explosion sound noise.But, for mute button and control box (MCU/Codec) not in the design of one, then cannot realize in this way.Such as control box is connected to earphone end by tone frequency channel wire, and microphone switch is positioned at earphone end, and the port (4-position, L/R/GND/MIC left/right/ground/microphone signal) being limited to audio jack then cannot realize.
The second way: use switch directly to control the break-make of microphone:
Can use touch-switch, meeting auto-returned after hand relieving, the mute button of current most earphone adopts such switch; Also can use toggle switch, as some application, use the design of MICboom, then coordinate switch mostly to be toggle switch.
Adopt series system: Fig. 1 to be tandem type microphone switch circuit diagram in prior art, as shown in Figure 1, switch series is connected to microphone loop, and switch closes, then microphone conducting; Switch disconnects, then microphone disconnects, and realizes quiet.This mode, in switch on and off moment, can produce explosion sound noise because of signal jitter.
Adopt parallel way: Fig. 2 to be parallel connection type microphone switch circuit diagram over the ground in prior art, as shown in Figure 2, switch connects microphone output signal over the ground, and switch disconnects, then microphone conducting; Switch closes, then microphone disconnects, and realizes quiet.At present a lot of mobile device on the market, adopts following design: realize quiet when mute button is short, mute button is long can allow main frame enter into a certain pattern, such as speech recognition on time on time.According to the mode that switch is in parallel over the ground, when switch over the ground UNICOM then mean mute button length by, the equipment of being correlated with may be made to enter certain pattern, cause misoperation problem, make troubles to user.
Summary of the invention
The invention provides a kind of microphone switch control circuit and method, the control end misoperation problem that may cause during to solve the operation of the existing microphone switch of parallel connection type over the ground, and avoid the explosion sound noise of switch on and off moment.
According to one aspect of the present invention, the invention provides a kind of microphone switch control circuit, be arranged on earphone end, described earphone end comprises microphone, switch, it is characterized in that, described control circuit comprises the first logical circuit, the second logical circuit;
The input of the second logical circuit described in first termination of described microphone and the first end of described switch, the output of described second logical circuit and the second end of described switch connect the input of described first logical circuit respectively, the second end of described microphone and the output common ground of described first logical circuit;
Described first logical circuit coordinates with described second logical circuit, for when described switch closes, the AC signal shorted to earth controlled in described microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground and avoided the misoperation of control end; And when described switch carries out on off operating mode change, suppress the too fast change of the level on described microphone output signal, avoid the explosion sound noise of described switch on and off moment.
Wherein, described first logical circuit coordinate with described second logical circuit specifically for:
When described switch is in closure state, described second logical circuit short circuit, AC signal in described microphone output signal realizes quiet by described first logical circuit shorted to earth, and the direct current signal in described microphone output signal is opened a way over the ground by described first logical circuit and avoided the misoperation of control end;
When described switch jumps to off-state from closure state, described microphone output signal carries out charging time delay by described second logical circuit to described first logical circuit, suppresses the too fast change of the level on described microphone output signal;
When described switch is in off-state, described microphone output signal completes charging by described second logical circuit to described first logical circuit;
When described switch jumps to closure state from off-state, described second logical circuit utilizes the described first logical circuit delaying current charged to flow through, suppress the too fast change of the level on described microphone output signal, and the AC signal in described microphone output signal realizes by described first logical circuit shorted to earth quiet.
Wherein, described first logical circuit comprises direct-to-ground capacitance;
The first end of described direct-to-ground capacitance as described first logical circuit input termination described in the output of the second logical circuit;
Second end of described direct-to-ground capacitance as described first logical circuit output termination described in the second end of microphone.
Wherein, described second logical circuit comprises the first resistance and cross-over connection diode;
The link of the positive pole of cross-over connection diode described in first termination of described first resistance, as the input of described second logical circuit;
The link of the negative pole of cross-over connection diode described in second termination of described first resistance, as the output of described second logical circuit.
Preferably, described earphone end also comprises the first magnetic bead;
After second end of microphone described in the second termination of described direct-to-ground capacitance, by described first magnetic bead ground connection.
Preferably, described earphone end also comprises the second magnetic bead and the second resistance;
The first end of described second magnetic bead connects the first end of the first end of described microphone, the first end of described first resistance, the positive pole of cross-over connection diode and described switch respectively;
The microphone bias voltage of the first termination control end of described second resistance;
The link of the second end of the second resistance described in second termination of described second magnetic bead, as the output of earphone end to control end.
According to another aspect of the present invention, the invention provides a kind of microphone switch control method, comprising:
The first logical circuit and the second logical circuit is increased at earphone end, the input of the second logical circuit and the first end of switch described in first termination of microphone, the output of described second logical circuit and the second end of described switch connect the input of described first logical circuit respectively, the second end of described microphone and the output common ground of described first logical circuit;
Described first logical circuit coordinates with described second logical circuit, when switch closes, the AC signal shorted to earth controlled in described microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground and avoided the misoperation of control end; And when described switch carries out on off operating mode change, suppress the too fast change of the level on described microphone output signal, avoid the explosion sound noise of described switch on and off moment.
Wherein, described when described switch carries out on off operating mode change, suppress the too fast change of the level on described microphone output signal, avoid the explosion sound noise of described switch on and off moment, comprising:
When described switch jumps to off-state from closure state, by described second logical circuit, charging time delay is carried out to described first logical circuit, suppress the too fast change of the level on described microphone output signal;
When described switch jumps to closure state from off-state, in the second logical circuit described in the described first logical circuit time delay that utilization has been charged, electric current flows through, and suppresses the too fast change of the level on described microphone output signal, avoids explosion sound noise.
Wherein, the first logical circuit comprises direct-to-ground capacitance;
The AC signal shorted to earth utilizing described direct-to-ground capacitance to control in described microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground and avoided the misoperation of control end.
Wherein, described second logical circuit comprises the first resistance and cross-over connection diode;
Described first resistance is connected with described first logical circuit, when described switch jumps to off-state from closure state, charging time delay is carried out to the first logical circuit, avoid explosion sound noise;
By the two ends of described cross-over connection diodes in parallel to described first resistance, when suppressing described switch to jump to closure state from off-state, the too fast change of the level on described microphone output signal, avoids explosion sound noise.
The invention has the beneficial effects as follows: the AC signal shorted to earth that microphone switch control circuit provided by the invention controls in microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground, can not allow control end be identified as mute button length by, thus avoid control end misoperation, and effectively inhibit switch carry out on off operating mode change time microphone output signal on the too fast change of level, avoid switch on and off moment explosion sound noise.Microphone switch control circuit provided by the invention, hardware circuit is increased at earphone end, the characteristic of simple dependence hardware device, realize quiet while and avoid control end misoperation, and effectively suppress the explosion sound noise of switch on and off moment, do not need the cooperation of software, scheme implementation is simple, and with low cost.
Accompanying drawing explanation
Fig. 1 is tandem type microphone switch circuit diagram in prior art;
Fig. 2 is parallel connection type microphone switch circuit diagram over the ground in prior art;
The microphone switch control circuit schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The microphone switch control circuit physical circuit figure that Fig. 4 provides for the embodiment of the present invention;
The microphone switch control method flow chart that Fig. 5 provides for the embodiment of the present invention;
The microphone switch control circuit acoustical behavior test design sketch that Fig. 6 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
The microphone switch control circuit schematic diagram that Fig. 3 provides for the embodiment of the present invention.As shown in Figure 3, the microphone switch control circuit that the embodiment of the present invention provides, is arranged on earphone end, and earphone end comprises microphone MIC, interrupteur SW, and this control circuit comprises the first logical circuit, the second logical circuit;
The input of the first termination second logical circuit of microphone MIC and the first end of interrupteur SW, the output of the second logical circuit and the second end of interrupteur SW connect the input of the first logical circuit respectively, second end of microphone MIC and the output common ground of the first logical circuit;
First logical circuit coordinates with the second logical circuit, for when interrupteur SW closes, the AC signal shorted to earth controlled in microphone output signal MIC_SIG realizes quiet, and the direct current signal controlled in microphone output signal MIC_SIG is opened a way over the ground and avoided the misoperation of control end; And when interrupteur SW carries out on off operating mode change, suppress the too fast change of level on microphone output signal MIC_SIG, avoid the explosion sound noise of interrupteur SW break-make moment.
First logical circuit coordinate with the second logical circuit specifically for:
When interrupteur SW is in closure state, second logical circuit short circuit, AC signal in microphone output signal MIC_SIG realizes quiet by the first logical circuit shorted to earth, and the direct current signal in microphone output signal MIC_SIG is opened a way over the ground by the first logical circuit and avoided the misoperation of control end;
When interrupteur SW jumps to off-state from closure state, microphone output signal MIC_SIG carries out charging time delay by the second logical circuit to the first logical circuit, suppresses the too fast change of level on microphone output signal MIC_SIG;
When interrupteur SW is in off-state, microphone output signal MIC_SIG completes charging by the second logical circuit to the first logical circuit;
When interrupteur SW jumps to closure state from off-state, second logical circuit utilizes the first logical circuit delaying current charged to flow through, suppress the too fast change of level on microphone output signal MIC_SIG, and the AC signal in microphone output signal MIC_SIG realizes by the first logical circuit shorted to earth quiet.
The microphone switch control circuit physical circuit figure that Fig. 4 provides for the embodiment of the present invention.As shown in Figure 4, the first logical circuit comprises direct-to-ground capacitance C1; The first end of direct-to-ground capacitance C1 is as the output of input termination second logical circuit of the first logical circuit; Second end of direct-to-ground capacitance is as the second end of the output termination microphone of the first logical circuit.
Second logical circuit comprises the first resistance R1 and cross-over connection diode D1; The link of the positive pole of the first termination cross-over connection diode D1 of the first resistance R1, as the input of the second logical circuit; The link of the negative pole of the second termination cross-over connection diode D1 of the first resistance R1, as the output of the second logical circuit.
When switch sw is closed, the first resistance R1 short circuit, microphone output signal MIC_SIG realizes quiet by direct-to-ground capacitance C1 shorted to earth.
When interrupteur SW is from when being closed into disconnection, microphone output signal MIC_SIG is charged to direct-to-ground capacitance C1 by the first resistance R1, the clamping action of cross-over connection diode D1 effectively can avoid that switch on and off moment microphone output signal MIC_SIG has large level fluctuation, the existence of the first resistance R1 and cross-over connection diode D1 well suppresses the too fast change of the level on microphone output signal MIC_SIG, avoids producing explosion sound noise.
When interrupteur SW is from when being disconnected to closed, direct-to-ground capacitance C1 charges at two ends, then do not have electric current to flow through the first resistance R1 instantaneously, avoid the instant jitter of microphone output signal MIC_SIG, suppresses explosion sound noise.Microphone output signal MIC_SIG can pass through direct-to-ground capacitance C1 shorted to earth simultaneously, realizes quiet.
When switch sw is closed, to direct current signal for open circuit, so the direct current signal ground connection in microphone output signal MIC_SIG can not be made, can not allow control end detect be identified as mute button length by, thus avoid entering the long pattern by correspondence, avoid control end misoperation.
In the preferred embodiment of the present invention, earphone end also comprises the first magnetic bead L1; After second end of the second termination microphone of ground electric capacity C1, by the first magnetic L1 pearl ground connection.
In another preferred embodiment of the present invention, earphone end also comprises the second magnetic bead L2 and the second resistance R2; The first end of the second magnetic bead L2 connects the first end of microphone, the first end of the first resistance R1, the positive pole of cross-over connection diode D1 and the first end of interrupteur SW respectively;
The microphone bias voltage MIC_BIAS of the first termination control end of the second resistance R2;
The link of second end of the second termination second resistance R2 of the second magnetic bead L2, as the output of earphone end to control end.
The microphone switch control method flow chart that Fig. 5 provides for the embodiment of the present invention.As shown in Figure 5, the method comprises:
Step S510: increase the first logical circuit and the second logical circuit at earphone end, the input of the first termination second logical circuit of microphone and the first end of switch, the output of the second logical circuit and the second end of switch connect the input of the first logical circuit respectively, the second end of microphone and the output common ground of the first logical circuit.
Step S520: the first logical circuit coordinates with the second logical circuit, when switch closes, the AC signal shorted to earth controlled in microphone output signal realizes quiet, and the direct current signal controlled in microphone output signal is opened a way over the ground and avoided the misoperation of control end.
Step S530: when switch carries out on off operating mode change, suppress the too fast change of level on microphone output signal, avoid the explosion sound noise of switch on and off moment.
Wherein, step S530 specifically comprises:
When switch jumps to off-state from closure state, by the second logical circuit, charging time delay is carried out to the first logical circuit, suppress the too fast change of level on microphone output signal;
When switch jumps to closure state from off-state, utilize electric current in the first logical circuit time delay second logical circuit charged to flow through, suppress the too fast change of level on microphone output signal, avoid explosion sound noise.
In an embodiment of microphone switch control method provided by the invention, the first logical circuit comprises direct-to-ground capacitance; The AC signal shorted to earth utilizing direct-to-ground capacitance to control in microphone output signal realizes quiet, and the direct current signal controlled in microphone output signal is opened a way over the ground and avoided the misoperation of control end.
In another embodiment of microphone switch control method provided by the invention, the second logical circuit comprises the first resistance and cross-over connection diode; First resistance is connected with the first logical circuit, when switch jumps to off-state from closure state, charging time delay is carried out to the first logical circuit, avoid explosion sound noise;
By the two ends of cross-over connection diodes in parallel to the first resistance, when suppressing switch to jump to closure state from off-state, the too fast change of the level on microphone output signal, avoids explosion sound noise.
The microphone switch control circuit acoustical behavior test design sketch that Fig. 6 provides for the embodiment of the present invention.As shown in Figure 6, microphone switch control circuit provided by the invention, through actual testing authentication, the index of acoustical testing meets the demands, microphone switch control circuit does not produce harmful effect to the performance of microphone, and microphone switch break-make moment, explosion sound noise is effectively suppressed.
In sum, a kind of microphone switch control circuit provided by the invention and method, compared with prior art, have following beneficial effect:
1, the AC signal shorted to earth that microphone switch control circuit provided by the invention controls in microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground, can not allow control end be identified as mute button length by, thus avoid control end misoperation.
2, microphone switch control circuit provided by the invention, effectively inhibit switch carry out on off operating mode change time microphone output signal on the too fast change of level, avoid switch on and off moment explosion sound noise.
3, microphone switch control circuit provided by the invention, hardware circuit is increased at earphone end, the characteristic of simple dependence hardware device, realize quiet while and avoid control end misoperation, and effectively suppress the explosion sound noise of switch on and off moment, do not need the cooperation of software, scheme implementation is simple, and with low cost.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a microphone switch control circuit, is arranged on earphone end, and described earphone end comprises microphone, switch, it is characterized in that, described control circuit comprises the first logical circuit, the second logical circuit;
The input of the second logical circuit described in first termination of described microphone and the first end of described switch, the output of described second logical circuit and the second end of described switch connect the input of described first logical circuit respectively, the second end of described microphone and the output common ground of described first logical circuit;
Described first logical circuit coordinates with described second logical circuit, for when described switch closes, the AC signal shorted to earth controlled in described microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground and avoided the misoperation of control end; And when described switch carries out on off operating mode change, suppress the too fast change of the level on described microphone output signal, avoid the explosion sound noise of described switch on and off moment.
2. microphone switch control circuit as claimed in claim 1, is characterized in that, described first logical circuit coordinate with described second logical circuit specifically for:
When described switch is in closure state, described second logical circuit short circuit, AC signal in described microphone output signal realizes quiet by described first logical circuit shorted to earth, and the direct current signal in described microphone output signal is opened a way over the ground by described first logical circuit and avoided the misoperation of control end;
When described switch jumps to off-state from closure state, described microphone output signal carries out charging time delay by described second logical circuit to described first logical circuit, suppresses the too fast change of the level on described microphone output signal;
When described switch is in off-state, described microphone output signal completes charging by described second logical circuit to described first logical circuit;
When described switch jumps to closure state from off-state, described second logical circuit utilizes the described first logical circuit delaying current charged to flow through, suppress the too fast change of the level on described microphone output signal, and the AC signal in described microphone output signal realizes by described first logical circuit shorted to earth quiet.
3. microphone switch control circuit as claimed in claim 2, it is characterized in that, described first logical circuit comprises direct-to-ground capacitance;
The first end of described direct-to-ground capacitance as described first logical circuit input termination described in the output of the second logical circuit;
Second end of described direct-to-ground capacitance as described first logical circuit output termination described in the second end of microphone.
4. microphone switch control circuit as claimed in claim 2, it is characterized in that, described second logical circuit comprises the first resistance and cross-over connection diode;
The link of the positive pole of cross-over connection diode described in first termination of described first resistance, as the input of described second logical circuit;
The link of the negative pole of cross-over connection diode described in second termination of described first resistance, as the output of described second logical circuit.
5. microphone switch control circuit as claimed in claim 3, it is characterized in that, described earphone end also comprises the first magnetic bead;
After second end of microphone described in the second termination of described direct-to-ground capacitance, by described first magnetic bead ground connection.
6. microphone switch control circuit as claimed in claim 4, it is characterized in that, described earphone end also comprises the second magnetic bead and the second resistance;
The first end of described second magnetic bead connects the first end of the first end of described microphone, the first end of described first resistance, the positive pole of cross-over connection diode and described switch respectively;
The microphone bias voltage of the first termination control end of described second resistance;
The link of the second end of the second resistance described in second termination of described second magnetic bead, as the output of earphone end to control end.
7. a microphone switch control method, is characterized in that, described method comprises:
The first logical circuit and the second logical circuit is increased at earphone end, the input of the second logical circuit and the first end of switch described in first termination of microphone, the output of described second logical circuit and the second end of described switch connect the input of described first logical circuit respectively, the second end of described microphone and the output common ground of described first logical circuit;
Described first logical circuit coordinates with described second logical circuit, when switch closes, the AC signal shorted to earth controlled in described microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground and avoided the misoperation of control end; And when described switch carries out on off operating mode change, suppress the too fast change of the level on described microphone output signal, avoid the explosion sound noise of described switch on and off moment.
8. microphone switch control method as claimed in claim 7, it is characterized in that, described when described switch carries out on off operating mode change, suppress the too fast change of the level on described microphone output signal, avoid the explosion sound noise of described switch on and off moment, comprising:
When described switch jumps to off-state from closure state, by described second logical circuit, charging time delay is carried out to described first logical circuit, suppress the too fast change of the level on described microphone output signal;
When described switch jumps to closure state from off-state, in the second logical circuit described in the described first logical circuit time delay that utilization has been charged, electric current flows through, and suppresses the too fast change of the level on described microphone output signal, avoids explosion sound noise.
9. microphone switch control method as claimed in claim 8, it is characterized in that, the first logical circuit comprises direct-to-ground capacitance;
The AC signal shorted to earth utilizing described direct-to-ground capacitance to control in described microphone output signal realizes quiet, and the direct current signal controlled in described microphone output signal is opened a way over the ground and avoided the misoperation of control end.
10. microphone switch control method as claimed in claim 8, it is characterized in that, described second logical circuit comprises the first resistance and cross-over connection diode;
Described first resistance is connected with described first logical circuit, when described switch jumps to off-state from closure state, charging time delay is carried out to the first logical circuit, avoid explosion sound noise;
By the two ends of described cross-over connection diodes in parallel to described first resistance, when suppressing described switch to jump to closure state from off-state, the too fast change of the level on described microphone output signal, avoids explosion sound noise.
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| CN201510617194.4A CN105187992B (en) | 2015-09-24 | 2015-09-24 | a kind of microphone switch control circuit and method |
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| CN201510617194.4A CN105187992B (en) | 2015-09-24 | 2015-09-24 | a kind of microphone switch control circuit and method |
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| CN105187992B CN105187992B (en) | 2018-09-28 |
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| CN105979423A (en) * | 2016-06-28 | 2016-09-28 | 青岛歌尔声学科技有限公司 | Mute circuit of microphone on earphone, and method |
| CN107548137A (en) * | 2016-06-29 | 2018-01-05 | 联芯科技有限公司 | The receiving channel switching method and device of a kind of radio frequency interface |
| CN107995372A (en) * | 2017-12-25 | 2018-05-04 | 维沃移动通信有限公司 | A kind of false touch ground connection identifying processing method, circuit and mobile terminal |
| CN112995817A (en) * | 2019-12-17 | 2021-06-18 | 纬创资通股份有限公司 | Microphone device, telephone device and decoupling circuit |
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| CN112995817B (en) * | 2019-12-17 | 2022-09-23 | 纬创资通股份有限公司 | Microphone device, telephone device and decoupling circuit |
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