CN104869512A - Earphone plugging noise suppression circuit - Google Patents
Earphone plugging noise suppression circuit Download PDFInfo
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- CN104869512A CN104869512A CN201510283689.8A CN201510283689A CN104869512A CN 104869512 A CN104869512 A CN 104869512A CN 201510283689 A CN201510283689 A CN 201510283689A CN 104869512 A CN104869512 A CN 104869512A
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Abstract
The invention discloses an earphone plugging noise suppression circuit comprising a noise control circuit which is connected between a central processor and an earphone interface circuit. The noise control circuit comprises an MOS transistor which is connected with the earphone interface circuit. A triode is connected in series between the MOS transistor and a power end. A first resistor and a second resistor are connected in parallel between the triode and the MOS transistor. A third resistor is connected in series on the second resistor. The earphone interface circuit comprises a left channel interface circuit, a right channel interface circuit, an audio interface circuit and an input and output interface circuit which is connected with the central processor. The pin of the input and output interface circuit is connected with the pin of the audio interface circuit under the situation that an earphone is plugged in. The beneficial effects of the earphone plugging noise suppression circuit are that the earphone interface circuit is connected at the interface of the central processor, and the MOS transistor is also arranged on the earphone interface circuit so that noise in plugging of the earphone is further reduced. Besides, the earphone plugging noise suppression circuit is also low in manufacturing cost, and the requirements for various types of conversations can be met.
Description
Technical field
The present invention relates to a kind of suppression headset plugging noise circuit.
Background technology
In the modern life of making rapid progress, various consumer entertainment electronic product emerges in an endless stream, wherein inevitably with voice headsets function, but the voice headsets circuit of existing standard columned earphone plug receptacle has the problem of noise when generally all there is interface, user, when having in earphone interface to mobile phone, inevitably hears either large or small ear-piercing interface noise; This brings bad impression to the user preparing the happy phone listened a piece of music or meet a friend.Traditional suppression earphone interface pop circuit can not effectively address this problem, and we propose the circuit that is effectively suppressed earphone interface noise now, and the method adopting software and hardware to combine, can well address this problem.Simultaneously, this circuit can Intelligent Recognition interface headphones be three sections of (use of listening to the music not with mic function of general interface computer) earphones or GB four sections (being usually used in being with the national standard mobile phone communication of mic function to use) earphone, and mobile phone can be made can not to be mistakenly identified as earphone interface when using non-GB four sections of earphones and to switch to earphone path (three sections of earphones are not with mic not send words function) when calling.
For the problem in correlation technique, at present effective solution is not yet proposed.
Summary of the invention
The object of this invention is to provide a kind of circuit preventing earphone interface noise, to overcome currently available technology above shortcomings.
The object of the invention is to be achieved through the following technical solutions:
A kind of suppression headset plugging noise circuit, comprise the noise control circuit be connected between central processing unit and earphone interface circuit, wherein, described noise control circuit comprises the metal-oxide-semiconductor be connected with described earphone interface circuit, triode is in series with between described metal-oxide-semiconductor and power end, also be parallel with resistance one and resistance two between this triode and metal-oxide-semiconductor, described resistance two is in series with resistance three; And, the input/output interface circuit that described earphone interface circuit comprises left channel interface circuit, right channel interface circuit, audio interface circuit and is connected with described central processing unit, wherein, the pin of this input/output interface circuit, when earphone inserts, is connected with the pin of described audio interface circuit.
Further, all ground capacity is in series with between described resistance one and described resistance three and between described resistance two and described resistance three.
Further, described left channel interface circuit, right channel interface circuit and input/output interface circuit are provided with magnetic bead.
A kind of head circuit, this head circuit has the suppression headset plugging noise circuit in claims 1 to 3 described in any one.
A kind of earphone, it is characterized in that, this earphone has head circuit according to claim 4.
Beneficial effect of the present invention is: by frames connecting with headphone interface circuit on the interface of central processing unit, and earphone interface circuit is also provided with metal-oxide-semiconductor further decrease earphone insert time noise, in addition also to have cost of manufacture low in the present invention, and can meet the requirement of various types of call.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the principle connection diagram of the suppression headset plugging noise circuit according to the embodiment of the present invention;
Fig. 2 is the earphone interface circuit figure according to the embodiment of the present invention.
In figure:
1, central processing unit; 2, earphone interface circuit; 3, noise control circuit; 4, metal-oxide-semiconductor; 5, power end; 6, triode; 7, resistance one; 8, resistance two; 9, resistance three; 10, left channel interface circuit; 11, right channel interface circuit; 12, audio interface circuit; 13, input/output interface circuit; 14, magnetic bead.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
As shown in Figure 1-2, one according to embodiments of the invention suppresses headset plugging noise circuit, comprise the noise control circuit 3 be connected between central processing unit 1 and earphone interface circuit 2, wherein, described noise control circuit 3 comprises the metal-oxide-semiconductor 4 be connected with described earphone interface circuit 2, be in series with triode 6 between described metal-oxide-semiconductor 4 and power end 5, between this triode 6 and metal-oxide-semiconductor 4, be also parallel with resistance 1 and resistance 28, described resistance 28 is in series with resistance 39; And, the input/output interface circuit 13 that described earphone interface circuit 2 comprises left channel interface circuit 10, right channel interface circuit 11, audio interface circuit 12 and is connected with described central processing unit 1, wherein, the pin of this input/output interface circuit 13, when earphone inserts, is connected with the pin of described audio interface circuit 12.
In addition, with reference to Fig. 2, in one embodiment, between described resistance 1 and described resistance 39 and between described resistance 28 and described resistance 39, all ground capacity is in series with.
Further, continue, with reference to Fig. 2, in one embodiment, described left channel interface circuit 10, right channel interface circuit 11 and input/output interface circuit 13 to be provided with magnetic bead 14.
A kind of head circuit, this head circuit has suppression headset plugging noise circuit.
A kind of earphone, it is characterized in that, this earphone has head circuit according to claim 4.
Wherein, described CPU comprises MSM7X27, MSM8X25, the mobile phone baseband process chip such as MT6575, MT6577 are the ARM kernel cell phone processor chips with powerful multimedia processing capability, there is complete radio frequency, audio frequency, image procossing and perfect interface function.
In the specific implementation, as shown in Figure 2, by means of only a metal-oxide-semiconductor, be placed between earphone interface circuit and noise control circuit, the direct connection both being disconnected by metal-oxide-semiconductor, realize mic bias voltage and control to realize the suppression of noise to the path of earphone mic.Adopt metal-oxide-semiconductor shorted to earth can only minimizing noise to a certain degree, to be that the mic of earphone is biased cause the root producing noise.Prevent the method for designing of earphone noise circuit, can deal with problems from root: when earphone inserts mobile phone, shell fragment in earphone base can make the F pin shell fragment of the inside be connected on the metal clips of R2 pin because earphone inserts, the voltage of so original F pin can become low level by high level, and (R2 pin is by magnetic bead ground connection, concerning direct current being exactly conducting, the connection on the ground that the voltage of F pin can be shorted becomes 0v voltage), the signal of F pin is fed on the interface one of CPU, when interface one detects that earphone insertion signal becomes low from height, the central processing unit time delay M time (being generally 10 ~ 50ms time), after earphone insertion is stable, the interface two of CPU provides high level, metal-oxide-semiconductor (Q5) grid (1 PIN) provides bias voltage to the mic of earphone for high (3 PIN) source electrode and (2 PIN) conducting that drains.Electric current is had to flow through the souffle problem of earphone appearance when so just can be avoided insertion.
In sum, by means of technique scheme of the present invention, by frames connecting with headphone interface circuit on the interface of central processing unit, and earphone interface circuit is also provided with metal-oxide-semiconductor further decrease earphone insert time noise, in addition also to have cost of manufacture low in the present invention, and can meet the requirement of various types of call.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. one kind is suppressed headset plugging noise circuit, it is characterized in that, comprise the noise control circuit (3) be connected between central processing unit (1) and earphone interface circuit (2), wherein, described noise control circuit (3) comprises the metal-oxide-semiconductor (4) be connected with described earphone interface circuit (2), triode (6) is in series with between described metal-oxide-semiconductor (4) and power end (5), also be parallel with resistance one (7) and resistance two (8) between this triode (6) and metal-oxide-semiconductor (4), described resistance two (8) is in series with resistance three (9); And, the input/output interface circuit (13) that described earphone interface circuit (2) comprises left channel interface circuit (10), right channel interface circuit (11), audio interface circuit (12) and is connected with described central processing unit (1), wherein, the pin of this input/output interface circuit (13), when earphone inserts, is connected with the pin of described audio interface circuit (12).
2. suppression headset plugging noise circuit according to claim 1, is characterized in that, be all in series with ground capacity between described resistance one (7) and described resistance three (9) and between described resistance two (8) and described resistance three (9).
3. suppression headset plugging noise circuit according to claim 1 and 2, is characterized in that, described left channel interface circuit (10), right channel interface circuit (11) and input/output interface circuit (13) are provided with magnetic bead (14).
4. a head circuit, is characterized in that, this head circuit has the suppression headset plugging noise circuit in claims 1 to 3 described in any one.
5. an earphone, is characterized in that, this earphone has head circuit according to claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510283689.8A CN104869512A (en) | 2015-05-28 | 2015-05-28 | Earphone plugging noise suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510283689.8A CN104869512A (en) | 2015-05-28 | 2015-05-28 | Earphone plugging noise suppression circuit |
Publications (1)
| Publication Number | Publication Date |
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| CN104869512A true CN104869512A (en) | 2015-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510283689.8A Pending CN104869512A (en) | 2015-05-28 | 2015-05-28 | Earphone plugging noise suppression circuit |
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| Country | Link |
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| CN (1) | CN104869512A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131729A (en) * | 2016-08-24 | 2016-11-16 | 成都市极米科技有限公司 | Earphone control circuit and method |
| CN106329651A (en) * | 2016-09-22 | 2017-01-11 | Tcl通讯（宁波）有限公司 | Wireless charging device of mobile terminal, wireless charging system and method thereof |
| CN110730399A (en) * | 2018-07-17 | 2020-01-24 | 青岛海信电器股份有限公司 | Display device earphone control circuit and display device |
Citations (4)
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| CN101340736A (en) * | 2007-07-04 | 2009-01-07 | 鸿富锦精密工业（深圳）有限公司 | POP noise suppressing circuit |
| WO2011010513A1 (en) * | 2009-07-21 | 2011-01-27 | Ricoh Company, Ltd. | Pop sound reduction circuit and audio circuit having such pop sound reduction circuit for use in audio amplifier |
| CN203086713U (en) * | 2012-12-29 | 2013-07-24 | 盛耀无线通讯科技（北京）有限公司 | Earphone interface circuit |
| CN204887412U (en) * | 2015-05-28 | 2015-12-16 | 盛耀无线通讯科技（北京）有限公司 | Restrain earphone plug noise circuit and possess head circuit and earphone of this circuit |
-
2015
- 2015-05-28 CN CN201510283689.8A patent/CN104869512A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340736A (en) * | 2007-07-04 | 2009-01-07 | 鸿富锦精密工业（深圳）有限公司 | POP noise suppressing circuit |
| WO2011010513A1 (en) * | 2009-07-21 | 2011-01-27 | Ricoh Company, Ltd. | Pop sound reduction circuit and audio circuit having such pop sound reduction circuit for use in audio amplifier |
| CN203086713U (en) * | 2012-12-29 | 2013-07-24 | 盛耀无线通讯科技（北京）有限公司 | Earphone interface circuit |
| CN204887412U (en) * | 2015-05-28 | 2015-12-16 | 盛耀无线通讯科技（北京）有限公司 | Restrain earphone plug noise circuit and possess head circuit and earphone of this circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131729A (en) * | 2016-08-24 | 2016-11-16 | 成都市极米科技有限公司 | Earphone control circuit and method |
| CN106131729B (en) * | 2016-08-24 | 2019-07-09 | 成都市极米科技有限公司 | Earphone control circuit and method |
| CN106329651A (en) * | 2016-09-22 | 2017-01-11 | Tcl通讯（宁波）有限公司 | Wireless charging device of mobile terminal, wireless charging system and method thereof |
| CN106329651B (en) * | 2016-09-22 | 2019-08-20 | Tcl通讯（宁波）有限公司 | A kind of wireless charging device of mobile terminal, wireless charging system and its method |
| CN110730399A (en) * | 2018-07-17 | 2020-01-24 | 青岛海信电器股份有限公司 | Display device earphone control circuit and display device |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20181018 Address after: 300000 Tianjin city free trade pilot area (Airport Economic Zone) west three road 158 financial center 4 Building 1 unit 602-3 Applicant after: DATANG TERMINAL TECHNOLOGY CO., LTD. Address before: 100191 No. eight, No. eight Huayuan Road, Haidian District, Beijing 816 Applicant before: Sheng Yao wireless communication technology (Beijing) Co., Ltd. |
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Application publication date: 20150826 |
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| RJ01 | Rejection of invention patent application after publication |