CN202503657U - Earphone socket circuit, and portable terminal applying the same - Google Patents
Earphone socket circuit, and portable terminal applying the same Download PDFInfo
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- CN202503657U CN202503657U CN2012200115285U CN201220011528U CN202503657U CN 202503657 U CN202503657 U CN 202503657U CN 2012200115285 U CN2012200115285 U CN 2012200115285U CN 201220011528 U CN201220011528 U CN 201220011528U CN 202503657 U CN202503657 U CN 202503657U
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- comparator
- earphone socket
- control unit
- switch element
- high level
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Abstract
The utility model relates to an earphone socket circuit, and a portable terminal applying the same. The earphone socket circuit comprising a microphone probe, a grounded probe, a right sound channel probe, and a left sound channel probe further comprises: a direct current blocking capacitor which is connected with the microphone probe; and a plug-pull detection circuit which is used for instantaneously releasing the charge on the direct current blocking capacitor when an earphone jack is pulled out.
Description
Technical field
The utility model relates to the earphone socket circuit, relates in particular to the earphone socket circuit of the transient noise that can reduce when extracting earphone and uses this portable terminal.
Background technology
Usually, portable terminal is meant the messaging device that the user can carry easily.For example, mobile communication terminal, personal digital assistant, MP3, notebook computer etc. belong to portable terminal.These portable terminals all can be equipped with at least one earphone socket, make the user under the situation that does not influence crowd on every side, use portable terminal.
According to the difference of manufacturer or accepted standard, earphone socket is divided into syllogic earphone socket and four-part form earphone socket usually.The syllogic earphone socket is made up of L channel, R channel and ground connection, and the four-part form earphone socket is made up of L channel, R channel, microphone segment and ground connection.Mobile communication terminal can use the four-part form earphone socket usually, realizes the function of utilizing earphone to converse thus.
Fig. 1 is the sketch map of existing earphone socket circuit.Among the figure, 11 expression microphone segment, 12 expression ground connection sections, 13 expression R channel sections, 14 expression L channel sections.Because L channel section 14 is positioned at the inside, so general using L channel section 14 detects the plug of headset plug.In the process of inserting headset plug, R channel section 13 can not run into dielectric with L channel section 14, therefore can not produce noise.After headset plug fully inserted, microphone segment was provided microphone bypass voltage and starts working.And when extracting headset plug; The microphone segment bypass will be disconnected; Owing to do not have low impedance path, so the electric charge on the microphone block capacitor C1 is owing to high resistance discharges slowly, if left and right acoustic channels section 14,13 is run into the microphone probe when being pulled out at this moment; Will cause producing the noise of moment, have a strong impact on user's sense of hearing.
The utility model content
The utility model proposes in order to address the above problem, and its purpose is to provide a kind of earphone socket circuit that can eliminate the noise that produces when extracting headset plug.
Another purpose of the utility model is to provide the portable terminal of the earphone socket circuit that application can eliminate the noise that produces when extracting headset plug.
To achieve these goals, the earphone socket circuit that the utility model provides in the earphone socket circuit that comprises microphone probe, grounded probe, R channel probe, L channel probe, also comprises: block capacitor is connected with said microphone probe; The plug testing circuit, being used for when extracting headset plug, the electric charge on the block capacitor is fallen in abrupt release.
Wherein, said plug testing circuit comprises: control unit is connected with said L channel probe; Switch element, an end is connected with said block capacitor, other end ground connection, and according to the output of said control unit and switch.
Preferably, when headset plug is not inserted into earphone socket, said control unit output high level; After the insertion headset plug is inserted into earphone socket fully, said control unit output low level, when said control unit is exported high level, said switch element conducting; When said control unit output low level, said switch element breaks off.
Preferably, said control unit is a comparator, and this comparator has a reference voltage, when supply power voltage during greater than said reference voltage, and said comparator output high level; When said supply power voltage during, said comparator output low level less than said reference voltage, when said comparator output high level, said switch element conducting; When said comparator output low level, said switch element breaks off.
Preferably, said control unit is metal-oxide-semiconductor or thyristor.
Preferably, said control unit comprises comparator and is connected the microprocessor of this comparator, and this comparator has a reference voltage, when supply power voltage during greater than said reference voltage, and said comparator output high level; When said supply power voltage during, said comparator output low level less than said reference voltage, the output of said microprocessor identification comparator, when said comparator output high level, said microprocessor output low level; When said comparator output low level, said microprocessor output high level, corresponding to this, when said microprocessor output low level, said switch element breaks off; When said comparator is exported high level, said switch element conducting.
Preferably, said switch element is one of them in metal-oxide-semiconductor, thyristor, the N transistor npn npn.
According to the utility model on the other hand, a kind of portable terminal of using above-mentioned earphone socket circuit is provided.
According to the utility model, can eliminate the transient noise that produces when extracting headset plug, thereby can improve user's sense of hearing.
Description of drawings
Fig. 1 is the sketch map of existing earphone socket circuit;
The sketch map of the earphone socket circuit that Fig. 2 provides for the utility model;
The sketch map of one example of the earphone socket circuit that Fig. 3 provides for the utility model;
Fig. 4 is the block diagram of the plug testing circuit of the utility model;
Fig. 5 for the utility model extract headset plug the time the sketch map of response time;
Fig. 6 is the figure of an example that the control unit of the utility model is shown.
The sketch map of another example of the earphone socket circuit that Fig. 7 provides for the utility model.
Embodiment
Below, specify the preferred embodiment of the utility model with reference to accompanying drawing.
The sketch map of one example of the earphone socket circuit that the sketch map of the earphone socket circuit that Fig. 2 provides for the utility model, Fig. 3 provide for the utility model; Fig. 4 is the block diagram of the plug testing circuit of the utility model.Can know that by Fig. 2 and Fig. 3 the earphone socket that the utility model provides from left to right comprises successively: microphone probe 110, grounded probe 120, R channel probe 130, L channel probe 140.Wherein, be connected with block capacitor C1 in the drive circuit of said microphone probe 110 (EAR_MIC), and between said block capacitor C1 and said microphone probe 110, also be connected in parallel to the microphone bypass (MICBias) that comprises a resistance R 1.And, said grounded probe 120 (EAR_jack) ground connection.Said R channel probe 130 and L channel probe 140 are connected with drive circuit (EAR_R and EAR_L) respectively.And, as shown in Figure 2, also be connected with plug testing circuit 100 on the said L channel probe 140, being used for when extracting headset plug, the electric charge on the block capacitor C1 is fallen in abrupt release.As shown in Figure 4, said plug testing circuit 100 comprises: feeder ear (V
DD) 101, control unit 150, switch element 160.Said feeder ear 101 comprises a resistance R 2, and is used for voltage to said L channel probe 140 being provided.Said control unit 150 in order to control after the switch of the switch element 160 stated.One end of switch element 160 is connected the other end and ground connection with the end of said block capacitor C1.Thus, under the control of control unit 150, said switch element 160 is optionally opened and is discharged the electric charge of savings at block capacitor C1, thereby prevents to produce noise in the moment of extracting headset plug.
Among one embodiment of the utility model, as shown in Figure 3, said control unit 150 is a comparator, is used to realize the detection of headset plug plug, and this comparator possesses reference voltage Vref, and this reference voltage satisfies 0＜Vm＜Vref＜V during design
DD, wherein Vm is the maximum voltage amplitude of earphone passage output audio, prevents the interference that audio signal detects plug.When not inserting earphone, reference voltage Vref＜V
EAR DET L=supply power voltage V
DD, comparator output terminal S1 exports high level; When inserting earphone, the voltage V of comparator input terminal
EAR DETLNear 0 value, so reference voltage Vref＞V
EAR DETL, comparator output terminal S1 output low level.Thus, can judge the plug state of earphone according to the output state of comparator output terminal S1.
And in the present embodiment, said switch element 160 is a metal-oxide-semiconductor; The source electrode of this metal-oxide-semiconductor is connected with said block capacitor C1; Grounded drain, and the grid of metal-oxide-semiconductor is connected the output of said control unit 150 is thus according to the output selectivity ground conducting of control unit 150.Particularly, when said control unit 150 output low levels, switch element 160 ends, and this moment, earphone was in user mode, and promptly headset plug is inserted in the said earphone socket fully, because switch element 160 ends, therefore can not influence the work of MIC.When headset plug leaves said earphone socket; The L channel section of headset plug is pulled out, i.e. L channel section and L channel probe separates, the output S 1 output high level of said control unit 150; Said switch element 160 is switched on; Electric charge moment on the block capacitor C1 is released to ground through this switch element 160 thus, causes microphone segment moment to return to earth potential, therefore can not produce noise in the moment that extract headset plug.
Fig. 5 for the utility model extract headset plug the time the sketch map of response time.Wherein t1 is the response time of control unit 150 output high level, and t2 is the response time that switch element 160 is switched on.Therefore t1+t2 is the general reaction time, and t1+t2 depends on reference voltage Vref, can make t1+t2 shorter through reducing reference voltage (but Vref need greater than Vm).This time is short more, and then noise is not easy to occur more.In practical application, for example, when Vref was 1.7V, t1+t2 was 170uS, and when Vref was lowered to 1.3V, t1+t2 was 80uS.
Hence one can see that; The technological thought of the utility model does; Solve the problem that electric charge on the block capacitor of the prior art can not abrupt release through the switch element that is connected with block capacitor; And pass through accurately some switching time of control switch unit of control unit, reach good elimination anti noise thus.
Under above-mentioned technological thought, except comparator, said control unit can also have other implementation.For example, said control unit can utilize thyristor or metal-oxide-semiconductor to realize that the high-low level of L channel detects.Fig. 6 is the figure of an example that the control unit of the utility model is shown.Among the figure, Q2 representes control unit, and it can be thyristor or metal-oxide-semiconductor, and when the plug of earphone did not insert, the output S1 of Q2 exported high level, inserts after the plug of earphone, and Q2 ends, output S1 output low level.Specifically, do not insert or headset plug when being pulled out V when the plug of earphone
EAR DETLReach the threshold voltage of Q2, thus the Q2 conducting, and output S1 exports high level; And after inserting headset plug, V
EAR DETLLess than the threshold voltage of Q2, Q2 ends, output S1 output low level.When the output S1 of Q2 output high level, switch element is switched on, and makes block capacitor C1 ground connection; When the output S1 of Q2 output low level, switch element is ended, and does not influence the work of microphone segment thus.At this moment, the threshold voltage of above-mentioned thyristor or metal-oxide-semiconductor should be greater than Vm.
In order to realize control more accurately, can connect a microprocessor (MCU) in the back of said comparator, thyristor or metal-oxide-semiconductor to switch element.The sketch map of another example of the earphone socket circuit that Fig. 7 provides for the utility model.At this moment, detect the output of the output S1 of said comparator, thyristor or metal-oxide-semiconductor, and export the control signal that is used for control switch unit through MCU.For example, when said comparator, thyristor or metal-oxide-semiconductor output high level, said MCU output low level; When said comparator, thyristor or metal-oxide-semiconductor output low level, said MCU output high level.At this moment, when the MCU output low level, switch element 160 ends; When MCU output high level, switch element 160 conductings.
And in the utility model, said switch element 160 can adopt metal-oxide-semiconductor, thyristor and N shape transistor.Those skilled in the art should know that as long as switch element 160 can end according to the output of control unit 150 or conducting, then any element can constitute switch element.
The utility model is not limited to the foregoing description, under the situation that does not break away from the utility model scope, can carry out various distortion and modification.
Claims (8)
1. an earphone socket circuit comprises microphone probe, grounded probe, R channel probe, L channel probe, it is characterized in that, also comprises:
Block capacitor is connected with said microphone probe;
The plug testing circuit, being used for when extracting headset plug, the electric charge on the block capacitor is fallen in abrupt release.
2. earphone socket circuit according to claim 1 is characterized in that, said plug testing circuit comprises:
Control unit is connected with said L channel probe;
Switch element, an end is connected with said block capacitor, other end ground connection, and according to the output of said control unit and switch.
3. earphone socket circuit according to claim 2 is characterized in that, when headset plug is not inserted into earphone socket, and said control unit output high level; After the insertion headset plug is inserted into earphone socket fully, said control unit output low level,
When said control unit is exported high level, said switch element conducting; When said control unit output low level, said switch element breaks off.
4. earphone socket circuit according to claim 3 is characterized in that, said control unit is a comparator, and this comparator has a reference voltage, when supply power voltage during greater than said reference voltage, and said comparator output high level; When said supply power voltage during, said comparator output low level less than said reference voltage,
When said comparator is exported high level, said switch element conducting; When said comparator output low level, said switch element breaks off.
5. earphone socket circuit according to claim 3 is characterized in that, said control unit is metal-oxide-semiconductor or thyristor.
6. earphone socket circuit according to claim 2; It is characterized in that said control unit comprises comparator and the microprocessor that is connected this comparator, this comparator has a reference voltage; When supply power voltage during greater than said reference voltage, said comparator output high level; When said supply power voltage during, said comparator output low level less than said reference voltage,
The output of said microprocessor identification comparator, when said comparator is exported high level, said microprocessor output low level; When said comparator output low level, said microprocessor output high level,
Corresponding to this, when said microprocessor output low level, said switch element breaks off; When said comparator is exported high level, said switch element conducting.
7. earphone socket circuit according to claim 2 is characterized in that, said switch element is one of them in metal-oxide-semiconductor, thyristor, the N transistor npn npn.
8. a portable terminal is characterized in that, possesses according to the described earphone socket circuit of each claim in the claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200115285U CN202503657U (en) | 2012-01-09 | 2012-01-09 | Earphone socket circuit, and portable terminal applying the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200115285U CN202503657U (en) | 2012-01-09 | 2012-01-09 | Earphone socket circuit, and portable terminal applying the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202503657U true CN202503657U (en) | 2012-10-24 |
Family
ID=47040255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200115285U Expired - Lifetime CN202503657U (en) | 2012-01-09 | 2012-01-09 | Earphone socket circuit, and portable terminal applying the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202503657U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414042A (en) * | 2013-07-25 | 2013-11-27 | 苏州三星电子电脑有限公司 | Four-segment type headphone port and laptop with same |
| CN103686531A (en) * | 2012-08-29 | 2014-03-26 | 三星电子株式会社 | Earphone connection interface, terminal including the same, and method of operating terminal |
| CN104053089A (en) * | 2013-03-11 | 2014-09-17 | 联想(北京)有限公司 | Audio plug pin determination method, audio interface and electronic devices |
| CN105591251A (en) * | 2016-02-24 | 2016-05-18 | 惠州Tcl移动通信有限公司 | Earphone socket, earphone interface circuit, and plugging/unplugging detection and control method |
| CN105792069A (en) * | 2014-12-26 | 2016-07-20 | 联芯科技有限公司 | Headset base interface circuit |
| CN112399320A (en) * | 2019-08-16 | 2021-02-23 | 神讯电脑(昆山)有限公司 | Electret microphone detection circuit |
-
2012
- 2012-01-09 CN CN2012200115285U patent/CN202503657U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103686531A (en) * | 2012-08-29 | 2014-03-26 | 三星电子株式会社 | Earphone connection interface, terminal including the same, and method of operating terminal |
| CN103686531B (en) * | 2012-08-29 | 2018-11-02 | 三星电子株式会社 | The method of the terminal and the operation terminal of earphone connection interface including earphone connection interface |
| CN104053089A (en) * | 2013-03-11 | 2014-09-17 | 联想(北京)有限公司 | Audio plug pin determination method, audio interface and electronic devices |
| CN104053089B (en) * | 2013-03-11 | 2017-11-07 | 联想(北京)有限公司 | A kind of determination method, COBBAIF and the electronic equipment of audio jack pin |
| CN103414042A (en) * | 2013-07-25 | 2013-11-27 | 苏州三星电子电脑有限公司 | Four-segment type headphone port and laptop with same |
| CN105792069A (en) * | 2014-12-26 | 2016-07-20 | 联芯科技有限公司 | Headset base interface circuit |
| CN105792069B (en) * | 2014-12-26 | 2019-04-16 | 联芯科技有限公司 | A kind of earphone base interface circuit |
| CN105591251A (en) * | 2016-02-24 | 2016-05-18 | 惠州Tcl移动通信有限公司 | Earphone socket, earphone interface circuit, and plugging/unplugging detection and control method |
| CN112399320A (en) * | 2019-08-16 | 2021-02-23 | 神讯电脑(昆山)有限公司 | Electret microphone detection circuit |
| CN112399320B (en) * | 2019-08-16 | 2022-04-19 | 神讯电脑(昆山)有限公司 | Electret microphone detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121024 |