CN205040008U - Earphone audio input switching circuit - Google Patents
Earphone audio input switching circuit Download PDFInfo
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- CN205040008U CN205040008U CN201520668861.7U CN201520668861U CN205040008U CN 205040008 U CN205040008 U CN 205040008U CN 201520668861 U CN201520668861 U CN 201520668861U CN 205040008 U CN205040008 U CN 205040008U
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Abstract
The utility model belongs to the technical field of headphone structure, especially, relate to an earphone audio input switching circuit. The embodiment of the utility model provides an in, earphone audio input switching circuit adopts switch control module to detect the voltage variation that headphone plug inserted the earphone interface, switches bluetooth communication module or earphone interface as audio source to switching and using bluetooth headset and drive -by -wire earphone, replaced the mode adoption mechanical switch that present earphone switches, low cost also is difficult to damage.
Description
Technical field
The utility model belongs to earphone control technology field, particularly relates to a kind of earpiece audio input-switching circuit.
Background technology
Earphone is as a kind of converting unit, and it accepts the electric signal that media player or receiver send, and utilize the loud speaker of ear to convert it into the sound wave that can hear, therefore, earphone is widely used in the middle of daily life.
Present earphone comprises bluetooth earphone and line control earphone; user is when use earphone; often can run into switch and use bluetooth earphone and line control earphone; the mode that present earphone switches normally adopts mechanical switch to operate; mechanical switch is adopted to there is problem with high costs; and long-time operation mechanical switch, also exists and holds flimsy problem.
Utility model content
The object of the utility model embodiment is to provide a kind of earpiece audio input-switching circuit, be intended to solve present earphone switching mode adopt mechanical switch exist with high costs, hold flimsy problem.
The utility model embodiment is achieved in that a kind of earpiece audio input-switching circuit, is connected respectively with left horn and right horn, and described earpiece audio input-switching circuit comprises:
The mutual bluetooth communication module of communication is carried out with bluetooth earphone;
For the earphone interface of line control earphone grafting;
Be connected with described left horn, bluetooth communication module and earphone interface respectively, connect the left analog switch module of described bluetooth communication module or the left voice-grade channel between earphone interface and left horn;
Be connected with described right horn, bluetooth communication module and earphone interface respectively, connect the right analog switch module of described bluetooth communication module or the right voice-grade channel between earphone interface and right horn; And
Respectively with described left analog switch module and right analog switch model calling, switch described bluetooth communication module or the earphone interface switching controls module as audio-source.
In said structure, described bluetooth communication module comprises the L channel positive terminal L+ and L channel negative pole end L-that connect described left analog switch module respectively, also comprises the R channel positive terminal R+ and R channel negative pole end R-that connect described right analog switch module respectively.
In said structure, described earphone interface comprises the L channel end LINE_L connecing described left analog switch module and the R channel end LINE_R connecing described right analog switch module, also comprises the control end LINE_DET connecing described switching controls module.
In said structure, described left analog switch module adopts left analog switch chip U1, the L channel positive terminal NC2 of described left analog switch chip U1 and L channel negative pole end NC1 meets L channel positive terminal L+ and the L channel negative pole end L-of described bluetooth communication module respectively, the L channel end NO2 of described left analog switch chip U1 meets the L channel end LINE_L of described earphone interface, the earth terminal NO1 ground connection of described left analog switch chip U1, the switching controls end IN1 of described left analog switch chip U1 connects described switching controls module, first output COM1 and the second output COM2 of described left analog switch chip U1 connect left horn respectively.
In said structure, described right analog switch module adopts right analog switch chip U2, the R channel positive terminal NC2 of described right analog switch chip U2 and R channel negative pole end NC1 meets R channel positive terminal R+ and the R channel negative pole end R-of described bluetooth communication module respectively, the R channel end NO2 of described right analog switch chip U2 meets the R channel end LINE_R of described earphone interface, the earth terminal NO1 ground connection of described right analog switch chip U2, the switching controls end IN1 of described right analog switch chip U1 connects described switching controls module, first output COM1 and the second output COM2 of described right analog switch chip U2 connect right horn respectively.
In said structure, described switching controls module comprises:
Resistance R1, resistance R2, resistance R3, resistance R4 and triode Q1;
The emitter of described triode Q1 meets anode BATT+, the base stage of described triode Q1 meets the control end LINE_DET of described earphone interface by resistance R2, between the base stage that described resistance R1 is connected to described triode Q1 and emitter, the collector electrode of described triode Q1 meets the switching controls end IN1 of described left analog switch chip U1 and the switching controls end IN1 of right analog switch chip U2 by resistance R3 simultaneously.
In the utility model embodiment, earpiece audio input-switching circuit adopts the change in voltage of switching controls module Test earphone plug plugged earphone interface, switching bluetooth communication module or earphone interface are as audio-source, thus switch use bluetooth earphone and line control earphone, the mode that instead of the switching of present earphone adopts mechanical switch, with low cost, be also not easy to damage.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the earpiece audio input-switching circuit that the utility model embodiment provides;
Fig. 2 is the circuit structure diagram of the earpiece audio input-switching circuit that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the modular structure of the earpiece audio input-switching circuit that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model embodiment.
A kind of earpiece audio input-switching circuit, be connected with left horn 1 and right horn 2 respectively, described earpiece audio input-switching circuit comprises:
The mutual bluetooth communication module of communication 3 is carried out with bluetooth earphone;
For the earphone interface 4 of line control earphone grafting;
Be connected with described left horn 1, bluetooth communication module 3 and earphone interface 4 respectively, connect the left analog switch module 5 of described bluetooth communication module 3 or the left voice-grade channel between earphone interface 4 and left horn 1;
Be connected with described right horn 2, bluetooth communication module 3 and earphone interface 4 respectively, connect the right analog switch module 6 of described bluetooth communication module 3 or the right voice-grade channel between earphone interface 4 and right horn 2; And
Be connected with described left analog switch module 5 and right analog switch module 6 respectively, switch described bluetooth communication module 3 or the earphone interface 4 switching controls module 7 as audio-source.
As the utility model one embodiment, described bluetooth communication module 3 comprises the L channel positive terminal L+ and L channel negative pole end L-that connect described left analog switch module 5 respectively, also comprises the R channel positive terminal R+ and R channel negative pole end R-that connect described right analog switch module 6 respectively.
As the utility model one embodiment, described earphone interface 4 comprises the L channel end LINE_L connecing described left analog switch the module 5 and R channel end LINE_R connecing described right analog switch module 6, also comprises the control end LINE_DET connecing described switching controls module 7.
Fig. 2 shows the circuit structure of the earpiece audio input-switching circuit that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model embodiment.
As the utility model one embodiment, described left analog switch module 5 adopts left analog switch chip U1, the L channel positive terminal NC2 of described left analog switch chip U1 and L channel negative pole end NC1 meets L channel positive terminal L+ and the L channel negative pole end L-of described bluetooth communication module 3 respectively, the L channel end NO2 of described left analog switch chip U1 meets the L channel end LINE_L of described earphone interface 4, the earth terminal NO1 ground connection of described left analog switch chip U1, the switching controls end IN1 of described left analog switch chip U1 connects described switching controls module 7, first output COM1 and the second output COM2 of described left analog switch chip U1 connect left horn 1 respectively.
As the utility model one embodiment, described right analog switch module 6 adopts right analog switch chip U2, the R channel positive terminal NC2 of described right analog switch chip U2 and R channel negative pole end NC1 meets R channel positive terminal R+ and the R channel negative pole end R-of described bluetooth communication module 3 respectively, the R channel end NO2 of described right analog switch chip U2 meets the R channel end LINE_R of described earphone interface 4, the earth terminal NO1 ground connection of described right analog switch chip U2, the switching controls end IN1 of described right analog switch chip U1 connects described switching controls module 7, first output COM1 and the second output COM2 of described right analog switch chip U2 connect right horn 2 respectively.
As the utility model one embodiment, described switching controls module 7 comprises:
Resistance R1, resistance R2, resistance R3, resistance R4 and triode Q1;
The emitter of described triode Q1 meets anode BATT+, the base stage of described triode Q1 meets the control end LINE_DET of described earphone interface 4 by resistance R2, between the base stage that described resistance R1 is connected to described triode Q1 and emitter, the collector electrode of described triode Q1 meets the switching controls end IN1 of described left analog switch chip U1 and the switching controls end IN1 of right analog switch chip U2 by resistance R3 simultaneously.
The operation principle of described earpiece audio input-switching circuit is:
One. ANTENN AUDIO operating state
1, bluetooth start, battery powers to left analog switch chip U1 and right analog switch chip U2;
2, resistance R4 over the ground, now the switching controls end IN1 of left analog switch chip U1 and the switching controls end IN1 of right analog switch chip U2 is low level, left analog switch chip U1 is communicated with COM1, COM2 short circuit in chip respectively with NC1, NC2 of right analog switch chip U2, and NO1, NO2 of left analog switch chip U1 and right analog switch chip U2 disconnect with COM1, COM2 respectively in chip;
3, bluetooth communication module 3 exports L+, L-, and R+, R-two-way balanced type audio frequency, to left analog switch chip U1 and right analog switch chip U2, then outputs to left horn 1 and right horn 2 is play.
Two. line traffic control audio frequency input service state
1, when headset plug plugged earphone interface 4,1pin and the 2pin shorted to earth of earphone interface 4,1Pin connects R2 resistance to triode Q1 base stage, and base voltage is dragged down, and emitter and collector is positively biased, and triode Q1 is in saturation condition.
2, by resistance R3 and R4 to battery BATT dividing potential drop, the switching controls end IN1 of left analog switch chip U1 and the switching controls end IN1 of right analog switch chip U2 is high level, NC1, NC2 of left analog switch chip U1 and right analog switch chip U2 disconnect with COM1, COM2 respectively in chip, and NO1, NO2 of left analog switch chip U1 and right analog switch chip U2 connect with COM1, COM2 respectively in chip.
3, earphone interface 4 exports LIN_L, LIN_R two-way unbalanced audio frequency to left analog switch chip U1 and right analog switch chip U2, then outputs to left horn 1 and right horn 2 is play.
In the utility model embodiment, earpiece audio input-switching circuit adopts the change in voltage of switching controls module Test earphone plug plugged earphone interface, switching bluetooth communication module or earphone interface are as audio-source, thus switch use bluetooth earphone and line control earphone, the mode that instead of the switching of present earphone adopts mechanical switch, with low cost, be also not easy to damage.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (6)
1. an earpiece audio input-switching circuit, is connected with left horn and right horn respectively, it is characterized in that, described earpiece audio input-switching circuit comprises:
The mutual bluetooth communication module of communication is carried out with bluetooth earphone;
For the earphone interface of line control earphone grafting;
Be connected with described left horn, bluetooth communication module and earphone interface respectively, connect the left analog switch module of described bluetooth communication module or the left voice-grade channel between earphone interface and left horn;
Be connected with described right horn, bluetooth communication module and earphone interface respectively, connect the right analog switch module of described bluetooth communication module or the right voice-grade channel between earphone interface and right horn; And
Respectively with described left analog switch module and right analog switch model calling, switch described bluetooth communication module or the earphone interface switching controls module as audio-source.
2. earpiece audio input-switching circuit as claimed in claim 1, it is characterized in that, described bluetooth communication module comprises the L channel positive terminal L+ and L channel negative pole end L-that connect described left analog switch module respectively, also comprises the R channel positive terminal R+ and R channel negative pole end R-that connect described right analog switch module respectively.
3. earpiece audio input-switching circuit as claimed in claim 2, it is characterized in that, described earphone interface comprises the L channel end LINE_L connecing described left analog switch module and the R channel end LINE_R connecing described right analog switch module, also comprises the control end LINE_DET connecing described switching controls module.
4. earpiece audio input-switching circuit as claimed in claim 3, it is characterized in that, described left analog switch module adopts left analog switch chip U1, the L channel positive terminal NC2 of described left analog switch chip U1 and L channel negative pole end NC1 meets L channel positive terminal L+ and the L channel negative pole end L-of described bluetooth communication module respectively, the L channel end NO2 of described left analog switch chip U1 meets the L channel end LINE_L of described earphone interface, the earth terminal NO1 ground connection of described left analog switch chip U1, the switching controls end IN1 of described left analog switch chip U1 connects described switching controls module, first output COM1 and the second output COM2 of described left analog switch chip U1 connect left horn respectively.
5. earpiece audio input-switching circuit as claimed in claim 4, it is characterized in that, described right analog switch module adopts right analog switch chip U2, the R channel positive terminal NC2 of described right analog switch chip U2 and R channel negative pole end NC1 meets R channel positive terminal R+ and the R channel negative pole end R-of described bluetooth communication module respectively, the R channel end NO2 of described right analog switch chip U2 meets the R channel end LINE_R of described earphone interface, the earth terminal NO1 ground connection of described right analog switch chip U2, the switching controls end IN1 of described right analog switch chip U1 connects described switching controls module, first output COM1 and the second output COM2 of described right analog switch chip U2 connect right horn respectively.
6. earpiece audio input-switching circuit as claimed in claim 5, it is characterized in that, described switching controls module comprises:
Resistance R1, resistance R2, resistance R3, resistance R4 and triode Q1;
The emitter of described triode Q1 meets anode BATT+, the base stage of described triode Q1 meets the control end LINE_DET of described earphone interface by resistance R2, between the base stage that described resistance R1 is connected to described triode Q1 and emitter, the collector electrode of described triode Q1 meets the switching controls end IN1 of described left analog switch chip U1 and the switching controls end IN1 of right analog switch chip U2 by resistance R3 simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520668861.7U CN205040008U (en) | 2015-08-31 | 2015-08-31 | Earphone audio input switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520668861.7U CN205040008U (en) | 2015-08-31 | 2015-08-31 | Earphone audio input switching circuit |
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| CN205040008U true CN205040008U (en) | 2016-02-17 |
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| CN201520668861.7U Active CN205040008U (en) | 2015-08-31 | 2015-08-31 | Earphone audio input switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900940A (en) * | 2018-06-21 | 2018-11-27 | 珠海市杰理科技股份有限公司 | A kind of audio input circuit of the straight ear pushing machine of direct-coupling MCU |
-
2015
- 2015-08-31 CN CN201520668861.7U patent/CN205040008U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900940A (en) * | 2018-06-21 | 2018-11-27 | 珠海市杰理科技股份有限公司 | A kind of audio input circuit of the straight ear pushing machine of direct-coupling MCU |
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Address after: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee after: SHENZHE GUANXU ELECTRONIC CO., LTD. Address before: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee before: Shenzhen Grandsun Electronic Co., Ltd. |