CN203574819U - Earphone circuit and earphone - Google Patents
Earphone circuit and earphone Download PDFInfo
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- CN203574819U CN203574819U CN201320570009.7U CN201320570009U CN203574819U CN 203574819 U CN203574819 U CN 203574819U CN 201320570009 U CN201320570009 U CN 201320570009U CN 203574819 U CN203574819 U CN 203574819U
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- circuit
- earphone
- resistance
- head
- filter circuit
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Abstract
The embodiment of the utility model discloses an earphone circuit and an earphone, wherein the earphone circuit consists of discrete components. Through employing the earphone circuit, the noise of an audio signal can be filtered, thereby enabling the earphones of a mobile phone, a tablet computer and other mobile terminals to be good in anti-interference performance, improving the practicality of the earphone in an environment which has an interference signal, and improving the user experience.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of head circuit and earphone.
Background technology
When in conduction or the interference signal of radiation that the mobile terminals such as mobile phone, panel computer load in the external world, the signal of handset earphone output is often because noise appears in the interference of extraneous interference signal, thereby affect audio quality, reduction user experience effect.And EMC authentication cannot meet international standards because the earphone antijamming capability of the mobile terminals such as mobile phone, panel computer is low, make the mobile terminals such as mobile phone, panel computer cannot obtain international market access qualification, thereby limited manufacturer's selling market, reduced manufacturer's economic interests.
Utility model content
The utility model embodiment provides a kind of head circuit and earphone, can improve the interference free performance of the earphone end of mobile terminal, improves user and experiences.
A kind of head circuit that the utility model embodiment provides, described circuit comprises microphone internal circuit, microphone external circuit, earth terminal, earphone signal output circuit, the first filter circuit and the second filter circuit;
One end of described the first filter circuit is connected with one end of described microphone internal circuit, the other end of described the first filter circuit is connected with one end of described microphone external circuit, and the another end of described the first filter circuit is connected with described earth terminal respectively with the other end of described microphone internal circuit;
One end of described the second filter circuit is connected with the signal end of described earphone signal output circuit, the other end of described the second filter circuit is connected with the other end of described microphone external circuit, and the earth terminal of described earphone signal output circuit is connected with described earth terminal.
A kind of earphone that the utility model embodiment provides, comprises as above head circuit and the earphone case of an object, and described head circuit is built in described earphone case.
The utility model embodiment, has following beneficial effect:
The head circuit of the utility model embodiment by increasing by the first filter circuit between microphone internal circuit and microphone external circuit, and increase by the second filter circuit between microphone external circuit and earphone input/output circuitry, improved the antijamming capability of head circuit; This head circuit is simple in structure in addition, safe and reliable, improves user and experiences.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of a kind of head circuit of providing of the utility model embodiment;
Fig. 2 is the structural representation of a kind of earphone of providing of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, a kind of head circuit providing for the utility model embodiment.As shown in Figure 1, described circuit 10 comprises microphone (MIC) internal circuit 100, microphone external circuit 200, earth terminal 300, earphone signal output circuit 400, the first filter circuit 500 and the second filter circuit 600.
One end of described the first filter circuit 500 is connected with one end of described microphone internal circuit 100, the other end of described the first filter circuit 500 is connected with one end of described microphone external circuit 200, and the other end of described the first filter circuit 500 and described microphone internal circuit is connected with described earth terminal 300 respectively;
One end of described the second filter circuit 600 is connected with the signal end of described earphone signal output circuit 400, the other end of described the second filter circuit 600 is connected with the other end of described microphone external circuit 200, and the earth terminal of described earphone signal output circuit 400 is connected with described earth terminal 300.
Further, also comprise:
One end of described L channel circuit 700 is connected with the L channel end of described earphone signal output circuit 400, one end of described R channel circuit 800 is connected with the R channel end of described earphone signal output circuit 400, and the other end of the other end of described L channel circuit 700 and described R channel circuit 800 is connected with described earth terminal respectively.
Further, described the first filter circuit 500 comprises:
Resistance R 2 and capacitor C 1;
One end of described resistance R 2 is connected with described microphone internal circuit 100 one end, and the other end of described resistance R 2 is connected with one end of described microphone external circuit 200;
One end of described capacitor C 1 is connected with the other end of described resistance R 2, and the other end of described capacitor C 1 is connected with described earth terminal 300.
Further, in embodiments of the present invention, described the second filter circuit 600 comprises:
Magnetic bead B1 and resistance R 1;
One end of described resistance R 1 is connected with the signal end of described earphone signal output circuit 400, and the other end of described resistance R 1 is connected with one end of described magnetic bead B1, and the other end of described magnetic bead B1 is connected with described microphone external circuit 200.Wherein, the scope of the resistance of described resistance R 1 is between 470 Ω～2000 Ω.The resistance of described magnetic bead B1 when 100MHz can be: 1k Ω, 1.8k Ω or 2.5k Ω.
Further, described the second filter circuit 700 also comprises:
Inductance L and resistance R 1;
One end of described resistance R 1 is connected with the signal end of described earphone signal output circuit 400, and the other end of described resistance R 1 is connected with one end of described inductance L, and the other end of described inductance L is connected with described microphone external circuit 200.Wherein, the inductance value of described inductance L can be 0～100nH.The scope of the resistance of described resistance R 1 is between 470 Ω～2000 Ω.
Microphone internal circuit 100 can comprise power supply, field effect transistor and acoustic-electric converter etc.
Below in conjunction with Fig. 1, the operation principle of described head circuit 10 is described in detail.
When in conduction or the interference signal of radiation that the earphone being connected with terminal equipment loads in the external world, interference signal may be conducted in head circuit and earth terminal in the mode of electric current or voltage from the microphone of earphone, this interference may be that common mode may be also differential mode, if do not have filter circuit to carry out filtering to interference signal in head circuit, will cause interference signal to enter in head circuit, will affect the audio signal quality of head circuit carrying, audio signal be produced and surge and then carry noise.Therefore in order to obtain high-quality audio signal, need in the microphone of earphone, conduct into interference signal carry out filtering.
In head circuit 10, the first filter circuit 500 to from the microphone of earphone, conduct into high-frequency impulse interference signal carry out filtering, wherein, resistance R 2 and the capacitor C 1 of the first filter circuit 500 form RC filter circuit, and the noise that audio signal is carried carries out filtering.This makes the earphone of mobile terminal have antijamming capability, has ensured audio quality.
Further, under extraneous radiated interference, interference signal major part is the high-frequency impulse interference signal of some characteristic frequency.If only have the first filter circuit 500 to carry out filtering to described high-frequency impulse interference signal, possibly cannot reach the object of the most of interference signal of complete filtering or filtering, therefore in order to improve the interference free performance of circuit, need carry out filtering targetedly for the residing frequency range of most of interference signal.In head circuit, the high-frequency impulse interference signal of some characteristic frequency of filtering that the second filter circuit 600 can be purposive, thus better filter out interference signal.For example: under extraneous radiated interference, the interference signal that enters ear microphone is the interference signal of about 100MHz mostly, the interference signal that the second filter circuit 600 can filtering 100MHz left and right.In described interference signal enters ear microphone and pass in anti-jamming circuit, interference signal is in the process through the second filter circuit 600, the interference signal of 100MHz left and right will be filtered out by the second filter circuit, and the interference signal of other remaining frequency ranges will be carried out filtering by the first filter circuit 500.By the combinational circuit of the first filter circuit 500 and the second filter circuit 600, can effectively raise the antijamming capability of earphone.
Wherein, the second filter circuit 600 can be the filter circuit that magnetic bead B1 and resistance R 1 form.Wherein, thus magnetic bead B1 makes the high-frequency interferencing signal that audio signal is carried be converted into heat energy filtering high-frequency interferencing signal.Further, resistance R 1 can change the impedance of circuit, reduces disturbance current and shares voltage, makes the second filter circuit 600 can bring into play better filter action in low frequency filtering.Wherein, the resistance of magnetic bead when 100MHz can be: 1k Ω, 1.8k Ω or 2.5k Ω, the resistance of resistance can be 470 Ω～2000 Ω, specifically can need to select 500 Ω, 800 Ω, 1000 Ω, 1500 Ω or 1800 Ω etc. according to filtering.
Further, the second filter circuit 600 that the second filter circuit 600 can also be comprised of inductance L and resistance R 1.Wherein, the sense value of inductance L can be 100NH.
Further, the audio signal that earphone signal output circuit 400 is exported can be exported L channel audio frequency or right audio channel by L channel circuit 700 or R channel circuit 800, and user is listened to by the left and right receiver of earphone.
Again in conjunction with Fig. 1, the operation principle of described head circuit 10 is described in detail below.
When in conduction or the interference signal of radiation that mobile terminal loads in the external world, interference signal may have influence on the stable of electric current in the pcb board of terminal or voltage, makes its generation surge and then produce noise.Also may be due to the unstable interference signal of carrying of the electric current in the pcb board of mobile terminal or voltage to the audio signal of earphone output at mobile terminal.The earphone signal output circuit 400 of head circuit 10 is when the audio signal of mobile terminal receive input, and in order to obtain high-quality audio signal, the audio signal that need export earphone signal output circuit 400 is carried out filtering.At earphone signal output circuit 400, audio signal is exported in the first filter circuit 500, the high-frequency impulse interference signal that the first filter circuit 500 carries audio signal is carried out filtering and reduces the noise of audio signal.
Further, thereby mobile terminal also may be subject to certain interference line-hit to carry the interference signal of some characteristic frequency to the audio signal of earphone input, therefore need be to the interference signal of purposive some characteristic frequency of filtering of audio signal, thereby better promote audio quality.For example: audio signal is affected by external interference to cause audio signal to carry the interference signal of 100MHz.In audio signal through the first filter circuit 500 filtering and while exporting by microphone external circuit 200, the interference signal of the characteristic frequency that audio signal is carried by the second filter circuit 600 filtering audio signals.
Wherein, resistance R 2 and the capacitor C 1 of the first filter circuit 500 form RC filter circuit, and the noise that audio signal is carried carries out filtering.This makes the earphone of mobile terminal have antijamming capability, has ensured audio quality.
Wherein, the second filter circuit 600 can be the filter circuit that magnetic bead B1 and resistance R 1 form.Wherein, thus magnetic bead B1 makes the high-frequency interferencing signal that audio signal is carried be converted into heat energy filtering high-frequency interferencing signal.Further, resistance R 1 can change the impedance of circuit, reduces disturbance current and shares voltage, makes the second filter circuit 600 can bring into play better filter action in low frequency filtering.Wherein, the resistance of magnetic bead when 100MHz can be: 1k Ω, 1.8k Ω or 2.5k Ω, the resistance of resistance can be 470 Ω～2000 Ω, specifically can need to select 500 Ω, 800 Ω, 1000 Ω, 1500 Ω or 1800 Ω etc. according to filtering.
Further, the second filter circuit 600 that the second filter circuit 600 can also be comprised of inductance L and resistance R 1.Wherein, the sense value of inductance L can be 100NH.
Further, the audio signal that earphone signal output circuit 400 is exported can be exported L channel audio frequency or right audio channel by L channel circuit 700 or R channel circuit 800, and user is listened to by the left and right receiver of the earphone of connection left and right sound channels.
By upper we be understandable that, by increase by the first filter circuit between microphone internal circuit and microphone external circuit, and increase by the second filter circuit between microphone external circuit and earphone input/output circuitry, improve the antijamming capability of head circuit 10, thereby can make product pass through CS and RS test that international EMS authenticates.
Module or unit described in the utility model embodiment, can pass through universal integrated circuit, for example CPU(Central Processing Unit, central processing unit), or by ASIC(Application Specific Integrated Circuit, application-specific integrated circuit (ASIC)) realize.
Refer to Fig. 2, the structural representation of a kind of earphone providing for the utility model embodiment, it comprises earphone case 20 and head circuit, and head circuit herein can be the head circuit 10 of as above embodiment, and this head circuit 10 is built in earphone case 20.
In sum, head circuit 10 of the present utility model and earphone simple in structure, and safe and reliable.By increasing by the first filter circuit between the microphone internal circuit at head circuit 10 and microphone external circuit, and increase by the second filter circuit between microphone external circuit and earphone input/output circuitry, improved the antijamming capability of head circuit 10, make earphone to carry out filtering and to possess good interference free performance the noise of audio signal, improve the practicality of earphone under the environment that has interference signal and improved user's Experience Degree, thereby obtained market approval.Meanwhile, remove the circuit devcie of redundancy, reduced production cost.
Module or unit described in the utility model embodiment can be integrated according to actual needs, Further Division or delete.
Above disclosed is only the utility model preferred embodiment, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim, still belongs to the scope that the utility model is contained.
Claims (10)
1. a head circuit, is characterized in that, described circuit comprises microphone internal circuit, microphone external circuit, earth terminal, earphone signal output circuit, the first filter circuit and the second filter circuit;
One end of described the first filter circuit is connected with one end of described microphone internal circuit, the other end of described the first filter circuit is connected with one end of described microphone external circuit, and the another end of described the first filter circuit is connected with described earth terminal respectively with the other end of described microphone internal circuit;
One end of described the second filter circuit is connected with the signal end of described earphone signal output circuit, the other end of described the second filter circuit is connected with the other end of described microphone external circuit, and the earth terminal of described earphone signal output circuit is connected with described earth terminal.
2. head circuit as claimed in claim 1, is characterized in that, also comprises L channel circuit and R channel circuit;
One end of described L channel circuit is connected with the L channel end of described earphone signal output circuit, one end of described R channel circuit is connected with the R channel end of described earphone signal output circuit, and the other end of the other end of described L channel circuit and described R channel circuit is connected with described earth terminal respectively.
3. head circuit as claimed in claim 2, is characterized in that, described the first filter circuit comprises:
Resistance R 2 and capacitor C 1;
One end of described resistance R 2 is connected with described microphone internal circuit one end, and the other end of described resistance R 2 is connected with one end of described microphone external circuit;
One end of described capacitor C 1 is connected with the other end of described resistance R 2, and the other end of described capacitor C 1 is connected with described earth terminal.
4. head circuit as claimed in claim 3, is characterized in that, described the second filter circuit comprises:
Magnetic bead B1 and resistance R 1;
One end of described resistance R 1 is connected with the signal end of described earphone signal output circuit, and the other end of described resistance R 1 is connected with one end of described magnetic bead B1, and the other end of described magnetic bead B1 is connected with described microphone external circuit.
5. head circuit as claimed in claim 4, is characterized in that, the resistance of described magnetic bead B1 when 100MHz is 1k Ω, 1.8k Ω or 2.5k Ω.
6. head circuit as claimed in claim 4, is characterized in that, the Standard resistance range of described resistance R 1 is between 470 Ω～2000 Ω.
7. head circuit as claimed in claim 3, is characterized in that, described the second filter circuit also comprises:
Inductance L and resistance R 1;
One end of described resistance R 1 is connected with the signal end of described earphone signal output circuit, and the other end of described resistance R 1 is connected with one end of described inductance L, and the other end of described inductance L is connected with described microphone external circuit.
8. head circuit as claimed in claim 7, is characterized in that, the inductance value of described inductance L is 100nH.
9. head circuit as claimed in claim 7, is characterized in that, the Standard resistance range of described resistance R 1 is between 470 Ω～2000 Ω.
10. an earphone, is characterized in that: comprise head circuit and earphone case as described in claim 1～8 any one, described head circuit is built in described earphone case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320570009.7U CN203574819U (en) | 2013-09-13 | 2013-09-13 | Earphone circuit and earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320570009.7U CN203574819U (en) | 2013-09-13 | 2013-09-13 | Earphone circuit and earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203574819U true CN203574819U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320570009.7U Expired - Fee Related CN203574819U (en) | 2013-09-13 | 2013-09-13 | Earphone circuit and earphone |
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| Country | Link |
|---|---|
| CN (1) | CN203574819U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111901727A (en) * | 2020-07-30 | 2020-11-06 | 维沃移动通信有限公司 | Audio control circuit and electronic equipment |
-
2013
- 2013-09-13 CN CN201320570009.7U patent/CN203574819U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111901727A (en) * | 2020-07-30 | 2020-11-06 | 维沃移动通信有限公司 | Audio control circuit and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160303 Address after: Lake Industrial Park in Guangdong province Dongguan City Dalingshan Town 523811 Patentee after: DONGGUAN JINMING ELECTRONIC CO., LTD. Address before: Futian District Shenzhen City, Guangdong province 518040 Shennan Road No. 7028 East Times Technology Building, 21 floor Patentee before: Shenzhen Jinli Communication Equipment Co., Ltd. |
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| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20180315 Granted publication date: 20140430 |
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| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20210315 Granted publication date: 20140430 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20180913 |