CN106792343A - A kind of head circuit and electronic equipment - Google Patents
A kind of head circuit and electronic equipment Download PDFInfo
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- CN106792343A CN106792343A CN201510801509.0A CN201510801509A CN106792343A CN 106792343 A CN106792343 A CN 106792343A CN 201510801509 A CN201510801509 A CN 201510801509A CN 106792343 A CN106792343 A CN 106792343A
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- voltage
- bias
- earphone
- pin
- head circuit
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Abstract
The embodiment of the invention discloses a kind of head circuit and electronic equipment, the head circuit includes voltage comparator, the in-phase input end of the voltage comparator connects Mike's pin of earphone base, the inverting input connection reference voltage source of the voltage comparator, the other end ground connection of the reference voltage source, the output end connection controller of the voltage comparator, the controller is used to control bias voltage VbiasBreak-make, Mike's pin of the earphone base passes through the resistance R1 and bias voltage VbiasIt is connected, when the fully-inserted earphone base of earphone, the magnitude of voltage on earphone base Mike's pin is V0, the reference level of reference voltage source is Vref, wherein V0<Vref<Vbias.The head circuit and electronic equipment of present invention offer can eliminate earphone and extract noise for the earphone base of different structure designs.
Description
Technical field
The present invention relates to technical field of electronic equipment, more particularly to a kind of head circuit and electronic equipment.
Background technology
As the development of electronic technology, the function of electronic product are stronger and stronger, the use to electronic product is also got over
Come more frequent, the broadcasting for carrying out video file and audio file using electronic product is also more and more frequent, therefore
Use to earphone is just more and more.During earphone is inserted into earphone base or earphone is pulled out ear
During support, noise can be spread out of from the L channel or R channel of earphone, wherein the reason for insertion noise
It is that earphone is not fully inserted into, earphone bias voltage is opened, bias voltage is directly contacted with the left and right acoustic channels of earphone,
The electric discharge of moment, produces noise.Extract noise then with insertion noise conversely, extract when, the biased electrical of earphone
Pressure is not closed in time, by left and right acoustic channels instantaneous discharge, produces noise.Insertion, the extraction noise of earphone are not
But the subjective feeling of user can be substantially reduced, and the hearing of user can be influenceed when serious.
In order to eliminate the noise produced when earphone insertion is extracted, existing technical scheme is in earphone left and right acoustic channels
Between earth signal and connect discharge circuit, when left and right acoustic channels have sign mutation, discharge channel is opened over the ground,
And then avoid being heard by the user.
Realize it is of the invention during, inventor find at least there is following technical problem in the prior art：
Although existing technical scheme can solve the noise that earphone insertion is extracted, for different structure
For the earphone base of design, some earphone bases do not consider that earphone extracts the problem of noise when early stage is designed, when
When the different earphone bases of same earphone insertion are used, extraction noise may can be still produced.
The content of the invention
The present invention provides a kind of head circuit and electronic equipment, for the earphone base of different structure designs,
Earphone can be eliminated and extract noise.
On the one hand the present invention provides a kind of head circuit, and the head circuit includes voltage comparator, the electricity
Press Mike's pin of the in-phase input end connection earphone base of comparator, the inverting input of the voltage comparator
Connection reference voltage source, the other end ground connection of the reference voltage source, the output end of the voltage comparator connects
Controller is connect, the controller is used to control bias voltage VbiasBreak-make, Mike's pin of the earphone base
By the resistance R1 and bias voltage VbiasIt is connected, when the fully-inserted earphone base of earphone, earphone base Mike
Magnitude of voltage on pin is V0, the reference level of reference voltage source is Vref, wherein V0<Vref<Vbias。
Alternatively, when the output end of the voltage comparator is from low level to high level saltus step, the control
The bias voltage V is closed in device controlbias。
Alternatively, the controller includes voltage-stablizer, and the input of the voltage-stablizer is cell voltage, described
The output end of voltage-stablizer connects the bias voltage Vbias, the output end connection of the voltage comparator is described steady
The Enable Pin of depressor, it is described to make when the output end of the voltage comparator is from low level to high level saltus step
Can the end control closing bias voltage Vbias。
Alternatively, the voltage-stablizer is low pressure difference linear voltage regulator.
Alternatively, the reference level VrefIt is adjustable, cause V to adapt to different earphone base circuits0Change.
Alternatively, the bias voltage VbiasIt is 2.8V.
On the other hand, the present invention provides a kind of electronic equipment, and the electronic equipment includes earphone electricity described above
Road.
Head circuit and electronic equipment that the present invention is provided, when the fully-inserted earphone base of earphone, therefore when
V0<Vref, then voltage comparator output end is low level, during earphone is outwards extracted, works as earphone base
When Mike's pin is contacted with the dead ring at headset plug Mike, on the magnitude of voltage on earphone base Mike's pin
Move V tobias, now Vref<Vbias, then voltage comparator output end is high level, voltage comparator output letter
Number upset, controller is sent to the energizing signal as control signal, and bias voltage is closed in control, from
And thoroughly close noise source.Compared with prior art, the head circuit and electronic equipment that the present invention is provided can be with
Different earphone bases are preferably adapted to, optimizes and evade the ear brought due to the difference of earphone base physical dimension
Machine extracts noise.
Brief description of the drawings
Fig. 1 is structural representation in the prior art in the fully-inserted earphone base of earphone；
Fig. 2 is that earphone produces the structure for extracting noise to show during outwards being extracted from earphone base in the prior art
It is intended to；
Fig. 3 is the earphone base structural representation for not producing earphone to extract noise in the prior art；
Fig. 4 is embodiment of the present invention head circuit structural representation；
Fig. 5 is structural representation of the embodiment of the present invention head circuit in the fully-inserted earphone base of earphone；
Fig. 6 closes bias voltage, closing in the outside withdrawal process of earphone and makes an uproar for embodiment of the present invention head circuit
The structural representation of sound source；
Fig. 7 is the workflow diagram of embodiment of the present invention head circuit.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of all other embodiment for being obtained, belong to the scope of protection of the invention.
Fig. 1 is structural representation in the prior art in the fully-inserted earphone base of earphone.Wherein it is with dash area
Headset plug, dotted portion is earphone base, and L, R, G, the M on headset plug represent L channel, the right side respectively
Sound channel, ground connection and Mike, after headset plug is completely inserted into earphone base, L channel L on headset plug,
R channel R, ground connection G and Mike M respectively with earphone base in left channel pin (L), right channel pin (R),
Grounding pin (GND) and Mike's pin (MIC) are in contact.Mike's pin passes through resistance R1 and biased electrical
Pressure VbiasIt is connected, wherein bias voltage VbiasIt is 2.8V, resistance R1 is chosen as 2.2k Europe.
During earphone is outwards extracted, when headset plug moves to position as shown in Figure 2, earphone base
Mike's pin be in contact with the ground connection on headset plug, on the grounding pin on earphone base and headset plug
Right ear canal is in contact, and because now the L channel on earphone base L channel detection pin and headset plug is still
Connection status is so in, so now the bias voltage of Mike is still the state of unlatching, so will produce
Shown in Fig. 2 headset plug right ear canal is grounded to from bias voltage to headset plug to earphone base Mike pin
To the discharge path of earphone base grounding pin.Because the discharge path is by right ear canal, thus in right ear canal
Earphone is produced to extract noise.
During actual earphone is extracted, if the grounding pin of discharge path, i.e. earphone base cannot be formed
Do not contacted with the left and right acoustic channels of headset plug, then will not produce noise.As shown in figure 3, outwards being extracted in earphone
During being disengaged with headset plug L channel to earphone base L channel detection pin, the ground connection of earphone base
Pin is not produced with the left and right acoustic channels of headset plug and contacted, even if the magnitude of voltage V at earphone base Mike's pinmic
2.8V is pulled to, noise will not be also produced.During the follow-up outside extraction of earphone, because earphone
The L channel detection pin of seat is already off with the L channel of headset plug, and the bias voltage of Mike has been switched off,
Earphone thus will not be also produced to extract noise.I.e. in the structure design of earphone base grounding pin and Mike's pin away from
Close to so that earphone is outwards extracted to earphone base L channel detection pin to depart from headset plug L channel and connect
The grounding pin of earphone base is not contacted with the left and right acoustic channels of headset plug in tactile process, from without producing noise.
But for the earphone base of different structure designs, some earphone bases do not consider that earphone is pulled out when early stage is designed
Go out the problem of noise, when same earphone inserts different earphone bases to be used, can still may produce shown in Fig. 2
Extraction noise.
The embodiment of the present invention provides a kind of head circuit, as shown in figure 4, the head circuit includes voltage ratio
Compared with device (comparator) 41, the in-phase input end of voltage comparator connects Mike's pin 43 of earphone base, electricity
Press the inverting input connection reference voltage source 42 of comparator.The other end ground connection of reference voltage source.Voltage ratio
Controller 44 is connected compared with the output end of device, controller 44 is used to control bias voltage VbiasBreak-make.Earphone
Mike's pin 43 of seat passes through the resistance R1 and bias voltage VbiasIt is connected.When the fully-inserted earphone of earphone
During seat, the magnitude of voltage on earphone base Mike pin 43 is V0, the reference level of reference voltage source 42 is Vref,
Wherein V0<Vref<Vbias。
Optionally, as shown in figure 5, the controller can include voltage-stablizer, the input of voltage-stablizer is electricity
Cell voltage Vbat, the output end connection bias voltage V of voltage-stablizerbias.The voltage comparator (comparator)
Output end connect voltage-stablizer Enable Pin, when the output end of voltage comparator is from low level to high level saltus step
When, the output voltage of the voltage-stablizer is closed in the Enable Pin control, that is, close the bias voltage Vbias。
When earphone normally inserts earphone base, the bias voltage V of MikebiasNormally-open is 2.8V, now earphone base
Magnitude of voltage V on Mike's pinmic=V0, V0＜ Vbias, while by the reference level V of reference voltage sourcerefIf
It is set to V0＜ Vref＜ Vbias.Now the magnitude of voltage of voltage comparator in-phase input end is V0, voltage comparator is anti-
Mutually the magnitude of voltage of input is Vref, therefore when V0＜ Vref, the output end output low level of voltage comparator.
During earphone is outwards extracted from earphone base, it may appear that Mike's pin of earphone base is inserted with earphone
Dead ring contact on head at Mike, as shown in fig. 6, the now voltage V on earphone base Mike pinmicQuilt
It is pulled to 2.8V, i.e. Vmic=Vbias, and because earphone base L channel detection pin now is inserted with earphone
L channel is still within connection status on head, so now the bias voltage of Mike is still unlatching.Now
The magnitude of voltage of voltage comparator in-phase input end is Vbias, the magnitude of voltage of voltage comparator anti-phase input is Vref,
V when thereforeref＜ Vbias, the output end output high level of voltage comparator.Voltage comparator output end output electricity
Flat upset, the Enable Pin of voltage-stablizer is transferred to using the energizing signal as control signal (control signal),
Voltage-stablizer closes its output voltage, that is, close bias voltage Vbias, so as to thoroughly close noise source.Alternatively,
Voltage-stablizer can elect low pressure difference linear voltage regulator (LDO) as, and alternatively, voltage comparator can utilize amplifier
The level comparing function of comparator is realized.
Further, reference level VrefIt is adjustable, cause V to adapt to different earphone base circuits0Change, base
Reference voltage source can be joined by realizing reference voltage source using adjustable low pressure difference linear voltage regulator LDO is exported
It is more adjustable than level, so that Vref>V0。
The workflow diagram of the head circuit that Fig. 7 is provided for the present invention, the in-phase input end of voltage comparator connects
Mike's pin of lug support, the inverting input connection reference voltage source of voltage comparator, reference voltage source
Reference level is provided, with the magnitude of voltage on voltage comparator test earphone seat Mike's pin, as earphone base Mike
Magnitude of voltage on pin keeps earphone bias voltage V when being less than reference levelbiasOpen, draw when Mike is checked
Magnitude of voltage on pin closes earphone bias voltage when being more than reference level, so as to thoroughly close noise source.
Head circuit provided in an embodiment of the present invention, when the fully-inserted earphone base of earphone, therefore when V0<Vref,
Then voltage comparator output end is low level, during earphone is outwards extracted, when earphone base Mike's pin
When being contacted with the dead ring at headset plug Mike, the magnitude of voltage on earphone base Mike's pin is essentially pulled up to Vbias,
Now Vref<Vbias, then voltage comparator output end is high level, voltage comparator output end output level letter
Number upset, controller is sent to the energizing signal as control signal, and bias voltage is closed in control, from
And thoroughly close noise source.Compared with prior art, the head circuit that the present invention is provided can be adapted to preferably
Different earphone bases, is optimized and evaded the earphone brought due to the difference of earphone base physical dimension and extract noise.
The head circuit that the present invention is provided is completely by hardware circuit realization, fast response time, efficiency high.The present invention is carried
The head circuit of confession for audio signal without any decay while evaded earphone extract noise, improve ear
Machine performance.
Additionally, the present invention also provides a kind of electronic equipment, the electronic equipment includes what above-described embodiment was provided
The head circuit.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited to
This, any one skilled in the art the invention discloses technical scope in, can readily occur in
Change or replacement, should all be included within the scope of the present invention.Therefore, protection scope of the present invention
Should be defined by scope of the claims.
Claims (7)
1. a kind of head circuit, it is characterised in that：Including voltage comparator, the same phase of the voltage comparator
Input connects Mike's pin of earphone base, and the inverting input of the voltage comparator connects reference voltage source,
The other end ground connection of the reference voltage source, the output end connection controller of the voltage comparator, the control
Device processed is used to control bias voltage VbiasBreak-make, Mike's pin of the earphone base by resistance R1 with it is described
Bias voltage VbiasIt is connected, when the fully-inserted earphone base of earphone, the magnitude of voltage on earphone base Mike's pin is
V0, the reference level of reference voltage source is Vref, wherein V0<Vref<Vbias。
2. a kind of head circuit according to claim 1, it is characterised in that：When the voltage comparator
Output end from low level to high level saltus step when, the bias voltage V is closed in controller controlbias。
3. a kind of head circuit according to claim 2, it is characterised in that the controller includes steady
Depressor, the input of the voltage-stablizer is cell voltage, and the output end of the voltage-stablizer connects the biased electrical
Pressure Vbias, the output end of the voltage comparator connects the Enable Pin of the voltage-stablizer, when the voltage ratio compared with
When the output end of device is from low level to high level saltus step, the bias voltage V is closed in the Enable Pin controlbias。
4. a kind of head circuit according to claim 3, it is characterised in that the voltage-stablizer is low pressure
Difference linear constant voltage regulator.
5. a kind of head circuit according to any one of claim 1-4, it is characterised in that the ginseng
Than level VrefIt is adjustable, cause V to adapt to different earphone base circuits0Change.
6. a kind of head circuit according to any one of claim 1-4, it is characterised in that it is described partially
Put voltage VbiasIt is 2.8V.
7. a kind of electronic equipment, it is characterised in that the electronic equipment is included as any in claim 1-6
A kind of head circuit described in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801509.0A CN106792343A (en) | 2015-11-19 | 2015-11-19 | A kind of head circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801509.0A CN106792343A (en) | 2015-11-19 | 2015-11-19 | A kind of head circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106792343A true CN106792343A (en) | 2017-05-31 |
Family
ID=58916249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510801509.0A Pending CN106792343A (en) | 2015-11-19 | 2015-11-19 | A kind of head circuit and electronic equipment |
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| Country | Link |
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| CN (1) | CN106792343A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218871A (en) * | 2017-06-29 | 2019-01-15 | 北京小米移动软件有限公司 | Earphone interface circuit, audio mould group and electronic equipment |
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| CN103716734A (en) * | 2012-10-08 | 2014-04-09 | 三星电子株式会社 | Apparatus and method for detecting insertion of headset into mobile station |
| CN103929696A (en) * | 2014-03-17 | 2014-07-16 | 联想(北京)有限公司 | Earphone detection processing method, device and mobile terminal |
| CN104284273A (en) * | 2013-07-01 | 2015-01-14 | 美律电子(深圳)有限公司 | Handheld electronic device and corresponding anti-noise earphone |
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Patent Citations (6)
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| CN201509235U (en) * | 2009-09-25 | 2010-06-16 | 宇龙计算机通信科技(深圳)有限公司 | Headphone detection circuit of mobile terminal and mobile terminal thereof |
| CN201750528U (en) * | 2010-03-31 | 2011-02-16 | 宇龙计算机通信科技(深圳)有限公司 | Audio processing device |
| CN102761804A (en) * | 2012-06-14 | 2012-10-31 | 天地融科技股份有限公司 | Self-adaptive method and self-adaptive device of voice frequency interface, and electronic signature tool |
| CN103716734A (en) * | 2012-10-08 | 2014-04-09 | 三星电子株式会社 | Apparatus and method for detecting insertion of headset into mobile station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109218871A (en) * | 2017-06-29 | 2019-01-15 | 北京小米移动软件有限公司 | Earphone interface circuit, audio mould group and electronic equipment |
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Application publication date: 20170531 |
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