CN202713580U - Earphone compatible interface circuit for terminal device - Google Patents
Earphone compatible interface circuit for terminal device Download PDFInfo
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- CN202713580U CN202713580U CN 201220146835 CN201220146835U CN202713580U CN 202713580 U CN202713580 U CN 202713580U CN 201220146835 CN201220146835 CN 201220146835 CN 201220146835 U CN201220146835 U CN 201220146835U CN 202713580 U CN202713580 U CN 202713580U
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- interface
- earphone
- circuit
- terminal equipment
- microphone
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Abstract
The utility model provides an earphone compatible interface circuit for a terminal device, comprising left and right sound channel interfaces, a microphone interface and a ground end interface which are connected with the audio module of a terminal device, characterized in that the microphone interface is electrically connected with a control circuit, and the output sate of the control circuit is a zero potential level state or a high resistance state. According to the technical scheme, the earphone compatible interface circuit for a terminal device can enable the terminal device to be compatible with earphones with different types of interfaces, and does not cause an overhearing problem.
Description
Technical field
The utility model relates to a kind of earphone compatible interface circuit of terminal equipment
Background technology
At present, two kinds of different earphone interface types are arranged on the market, are respectively:
The first: L, R, MIC, GND (Chinese Industrial Standards (CIS) headset type)
The second: L, R, GND, MIC (American-European standard earphone type)
Wherein, L refers to that earphone L channel, R refer to that earphone R channel, MIC refer to that the microphone, the GND that carry on the earphone refer to that earphone publicly.The main distinction of above-mentioned these two kinds of earphones is: the order of MIC and GND is inconsistent, so these two kinds of earphones are in the also to some extent difference of the corresponding circuit of device end.
As shown in Figure 1, the equivalent electric circuit of earphone, two earphone heads about comprising, resistance value is about 32 ohm, the power supply of ear microphone is 1.9V, and middle biasing resistor is 2.5K, and because ear microphone has a fixing resistance value (resistance during work is 5-10K approximately), MIC_ADC is the AD acquisition port of connection device end, and the ADC of equipment end is by gathering the type that voltage on the earphone MIC can the auxiliary judgment earphone.If this earphone and main equipment end interface circuit mismatch, ear microphone is equivalent to be connected between earphone heads (MIC place) and the ground, and not only ear microphone can't normally use, and also can't use and listen sound function.
A solution is to adopt an analog switch, by the detection of CPU end, the path conversion that judgement realizes MIC and GND.As use a ST3301, the principle of its realization and internal frame diagram are as shown in Figure 2.
Another kind of scheme is to adopt the analog switch STG5223 of a single-pole double throw, builds a simple circuit by the outside and also can realize, as shown in Figure 3.
Above this two schemes all can solve dissimilar earphone and the unmatched problem of main equipment terminal circuit, can realize the purpose that main equipment and employed earphone are fully compatible fully.But above this two schemes has following shortcoming:
1, no matter acquire professional IC, or the analog switch of single-pole double throw cooperates external circuit, its circuit cost also will increase to some extent.
2, because all there are conducting resistance in various degree in professional IC and analog switch, the increase of conducting resistance can make earphone cross-talk performance sharply descend.
Summary of the invention
The utility model purpose is to propose a kind of earphone compatible interface circuit of terminal equipment, so that described terminal equipment can compatiblely be realized the sound function of listening of distinct interface standard earphone, does not increase the cost of circuit simultaneously.
A kind of earphone compatible interface circuit of terminal equipment, comprise the left and right acoustic channels interface, microphone interface and the ground end interface that are connected with the audio-frequency module of terminal equipment, it is characterized in that: described microphone interface is electrically connected with a control circuit, and the output state of described control circuit is held level and high-impedance state with comprising.
Further, described control circuit is the GPIO interface of processor.
When carrying out audio frequency output, GPIO interface output zero potential level, even earphone is different from the interface standard of terminal, its loud speaker also can access normally as with reference to ground, realizes listening sound function.In case thereby avoided headset type and main equipment not to mate the complete out of use situation of the earphone that causes.
When carrying out the microphone audio input, the output of GPIO interface is high-impedance state, this moment is for the earphone of coupling, can normally use the function of ear microphone, and for unmatched earphone, its microphone function lost efficacy, and processor can switch to the microphone of terminal equipment, does not so also affect the normal function of microphone.
As another implementation of such scheme, described control circuit can be the gate-controlled switch device that is electrically connected with the ground end.
Further, described control circuit comprises NPN type triode, and its collector electrode is electrically connected with microphone interface, grounded emitter, base stage is electrically connected with the control port of processor, and described control port is exported high level, output low level when microphone audio is inputted when audio frequency is exported.
The technical solution of the utility model not only takes full advantage of the processor control interface, realizes that terminal equipment to the compatibility of the earphone of various criterion interface, owing to not setting up IC chip or analog switching circuit, can not bring crosstalk problem simultaneously.The utlity model has execution mode simple, flexible, do not increase the advantages such as circuit cost.
Description of drawings
Fig. 1 is existing earphone end interface schematic equivalent circuit.
Fig. 2 is the schematic equivalent circuit of existing solution one.
Fig. 3 is the schematic equivalent circuit of existing solution two.
Fig. 4 is electrical block diagram one of the present utility model.
Fig. 5 is electrical block diagram two of the present utility model.
Embodiment
As shown in Figure 4, a kind of earphone compatible interface circuit of terminal equipment, comprise the left and right acoustic channels interface L that is connected with the audio-frequency module of terminal equipment R, microphone interface MIC and ground end interface GND, described microphone interface MIC is electrically connected the GPIO interface 9 of processor, between also be serially connected with a line resistance.
When carrying out audio frequency output, GPIO interface 9 output zero potential level, loud speaker accesses as with reference to ground take this, realizes listening sound function.
When carrying out the microphone audio input, 9 outputs of GPIO interface are high-impedance state, and this moment is for the earphone of coupling, can normally use the function of ear microphone, and for unmatched earphone, its microphone function lost efficacy, and processor can switch to the microphone of terminal equipment this moment.
As shown in Figure 5, another kind of implementation of the present utility model, described GPIO interface changes NPN type triode Q1 into, its collector electrode is electrically connected with microphone interface, grounded emitter, base stage is electrically connected with the control port 9 of processor, and described control port 9 is exported high level, output low level when microphone audio is inputted when audio frequency is exported.By to the conducting of triode Q1 cut-off control, realize unsettled or to microphone interface ground connection.
Above-mentioned only is better embodiment of the present utility model, does not limit the scope of this patent with this.Design all and of the present utility model equivalents identical, similar or that based on this circuit execution mode has been done, improvement all belong to the protection range of this patent.
Claims (4)
1. the earphone compatible interface circuit of a terminal equipment, comprise the left and right acoustic channels interface, microphone interface and the ground end interface that are connected with the audio-frequency module of terminal equipment, it is characterized in that: described microphone interface is electrically connected with a control circuit, and the output state of described control circuit is zero potential level or high-impedance state.
2. the earphone compatible interface circuit of a kind of terminal equipment according to claim 1, it is characterized in that: described control circuit is the GPIO interface of processor.
3. the earphone compatible interface circuit of a kind of terminal equipment according to claim 1, it is characterized in that: described control circuit can be the gate-controlled switch device that is electrically connected with the ground end.
4. the earphone compatible interface circuit of a kind of terminal equipment according to claim 3, it is characterized in that: described control circuit comprises NPN type triode, its collector electrode is electrically connected with microphone interface, grounded emitter, base stage is electrically connected with the control port of processor, described control port export high low level signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220146835 CN202713580U (en) | 2012-04-09 | 2012-04-09 | Earphone compatible interface circuit for terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220146835 CN202713580U (en) | 2012-04-09 | 2012-04-09 | Earphone compatible interface circuit for terminal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202713580U true CN202713580U (en) | 2013-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220146835 Expired - Lifetime CN202713580U (en) | 2012-04-09 | 2012-04-09 | Earphone compatible interface circuit for terminal device |
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| CN (1) | CN202713580U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357603A (en) * | 2015-11-20 | 2016-02-24 | 南京中科创达软件科技有限公司 | Compatible European standard and national standard earphone |
| WO2016090932A1 (en) * | 2014-12-10 | 2016-06-16 | 天地融科技股份有限公司 | Sound code product and sound code communication channel circuit |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
-
2012
- 2012-04-09 CN CN 201220146835 patent/CN202713580U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016090932A1 (en) * | 2014-12-10 | 2016-06-16 | 天地融科技股份有限公司 | Sound code product and sound code communication channel circuit |
| AU2015361769B2 (en) * | 2014-12-10 | 2017-11-23 | Tendyron Corporation | Sound code product and sound code communication channel circuit |
| US9871553B2 (en) | 2014-12-10 | 2018-01-16 | Tendyron Corporation | Audio apparatus and audio communication channel circuit |
| CN105357603A (en) * | 2015-11-20 | 2016-02-24 | 南京中科创达软件科技有限公司 | Compatible European standard and national standard earphone |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
| CN109922394B (en) * | 2017-12-13 | 2020-09-29 | 华为终端有限公司 | Bias voltage output circuit and drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: VIVO MOBILE COMMUNICATION CO., LTD. Free format text: FORMER OWNER: BUBUGAO ELECTRONIC INDUSTRY CO LTD, GUANGDONG Effective date: 20150324 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 523850 DONGGUAN, GUANGDONG PROVINCE TO: 523000 DONGGUAN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20150324 Address after: 283 No. 523000 Guangdong province Dongguan city Changan town usha BBK Avenue Patentee after: VIVO MOBILE COMMUNICATION CO., LTD. Address before: 523850 Guangdong Province, Dongguan city Changan town usha management area Patentee before: Guangdong Bubugao Electronic Industry Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130130 |
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| CX01 | Expiry of patent term |