CN209151333U - A kind of earphone - Google Patents
A kind of earphone Download PDFInfo
- Publication number
- CN209151333U CN209151333U CN201822164098.0U CN201822164098U CN209151333U CN 209151333 U CN209151333 U CN 209151333U CN 201822164098 U CN201822164098 U CN 201822164098U CN 209151333 U CN209151333 U CN 209151333U
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- circuit
- loudspeaker
- signal
- audio
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Abstract
The utility model discloses a kind of earphone, including main control chip and loudspeaker, it further includes audio detection circuit and switching circuit that main control chip, which transmits audio signal to two output ends of loudspeaker,；Two output ends of audio detection circuit and loudspeaker connect incoming audio signal, and audio signal is compared with default audio signal, export corresponding detection signal according to comparison result；The control terminal of switching circuit and the output end of audio detection circuit connect, and two output ends of input terminal and loudspeaker connect, output end ground connection；Switching circuit is grounded according to two output ends of detection signal conduction then loudspeaker, and switching circuit disconnects two output end incoming audio signals of then loudspeaker according to detection signal.The utility model is by adding audio detection circuit and switching circuit, and when earpiece volume being made to be transferred to the volume of default audio signal, switching circuit is mute by loudspeaker, is unlikely to cause to frighten to user, protects the ear of user, increases user experience.
Description
Technical field
The utility model relates to consumer electronics product technical field more particularly to a kind of earphones.
Background technique
When listening song perhaps to converse using earphone the adjusting of sound be by the volume button of earphone or the volume of mobile phone by
Key is adjusted, when user tunes up volume, it may appear that the case where volume is accidentally pressed always to maximum value, at this moment earphone
Sound is excessive, can cause to frighten to user, and have injury to ear.
Utility model content
In view of the above deficiencies, the technical problem to be solved by the utility model is to provide a kind of earphone, which will not be sent out
Raw volume adjustment increases user experience to maximum situation.
In order to solve the above technical problems, the technical solution of the utility model is:
A kind of earphone, main control chip and loudspeaker including electrical connection, the main control chip transmit audio signal to loudspeaker
Two output ends, further includes: two output ends connection access audio of audio detection circuit, the audio detection circuit and loudspeaker
Signal, and audio signal is compared with default audio signal, corresponding detection signal is exported according to comparison result；Switch
Circuit, the control terminal of the switching circuit is connect with the audio detection circuit accesses detection signal, and the two of input terminal and loudspeaker
A output end connection, output end ground connection；The switching circuit according to detection signal conduction then the loudspeaker two outputs termination
Ground, the switching circuit disconnect two output end incoming audio signals of the then loudspeaker according to detection signal.
Preferred embodiment is that the main control chip connect access detection signal with the audio detection circuit, and according to detection
Signal transmits the terminal device that corresponding adjusting signal volume gives the earphone connection.
Preferred embodiment is that the audio detection circuit includes power amplifier, rectification circuit and the voltage with reference voltage
Comparison circuit, reference voltage are the corresponding d. c. voltage signal of max volume audio signal；Wherein, the input termination of power amplifier
Enter audio signal, which is transmitted to rectification circuit after power amplifier amplifies, and is shaped to direct current by rectification circuit
Signal, and input voltage comparison circuit are pressed, is compared d. c. voltage signal with reference voltage by voltage comparator circuit, and lead to
It crosses output end and exports corresponding detection signal.
Preferred embodiment is that filter capacitor C4, institute are serially connected between an output end of the loudspeaker and the main control chip
It states and is serially connected with filter capacitor C5 between the another output of loudspeaker and the main control chip.
Preferred embodiment is that the reference voltage of the voltage comparator circuit is led to by the divider resistance R4 and divider resistance R5 concatenated
Partial pressure is crossed to obtain.
Preferred embodiment is, the switching circuit includes triode Q1 and triode Q2, the base stage of triode Q1 and the electricity
The output end connection of comparison circuit is pressed, collector is connect with an output end of the loudspeaker, emitter ground connection；Triode Q2's
Base stage is connect with the output end of the voltage comparator circuit, and collector is connect with the another output of the loudspeaker, emitter
Ground connection.
Preferred embodiment is that π type filter circuit is provided between rectification circuit and voltage comparator circuit, π type filter circuit packet
The filter inductance L1 being serially connected between rectification circuit and voltage comparator circuit is included, one end of filter inductance L1 is through filter capacitor C2
Ground connection, the other end are grounded through filter capacitor C3.
Preferred embodiment is that the input terminal of power amplifier is serially connected with the gain resistor for adjusting output gain.
Preferred embodiment is that the earphone is wired earphone, and the wired earphone passes through USB interface and terminal equipment in communication.
Due to the earphone using the utility model, main control chip and loudspeaker including electrical connection, main control chip transmit audio
Signal further includes audio detection circuit and switching circuit, wherein audio detection circuit and loudspeaker to two output ends of loudspeaker
Two output ends connect incoming audio signal, audio signal are compared with default audio signal, and according to comparison result
Export corresponding detection signal；Wherein the output end of the control terminal of switching circuit and audio detection circuit connects, input terminal and loudspeaker
The connection of two output ends, output end ground connection；Switching circuit according to detection signal conduction then loudspeaker two output ends be grounded,
Switching circuit disconnects two output end incoming audio signals of then loudspeaker according to detection signal.The earphone of the utility model passes through increasing
If audio detection circuit and switching circuit, when so that earpiece volume being transferred to the volume of default audio signal, by audio detection electricity
Road detects, by switching circuit that loudspeaker are mute, and audio signal will not be exported by loudspeaker, is unlikely to cause to shy to user
It frightens, protects the ear of user, increase user experience.
Since the output end of audio detection circuit is also electrically connected with main control chip, main control chip is according to detection signal transmission pair
The adjusting signal volume answered gives the terminal device of earphone connection；After detecting that audio signal volume is excessive, it is automatically adjusted to write from memory
Recognize volume, it is more convenient to use.
One due to loudspeaker is serially connected with filter capacitor C4, the another output of loudspeaker between output end and main control chip
Filter capacitor C5 is serially connected between main control chip；The filter capacitor can either filter, and can be together with switching circuit by sound
Frequency signal and the isolation of loudspeaker output end.
Due to being provided with π type filter circuit between rectification circuit and voltage comparator circuit, π type filter circuit includes being serially connected in
One end of filter inductance L1 between rectification circuit and voltage comparator circuit, filter inductance L1 are grounded through filter capacitor C2, separately
One end is grounded through filter capacitor C3；More accurate d. c. voltage signal is obtained by π type filter circuit, it is more accurate to detect.
Since the input terminal of power amplifier is serially connected with the gain resistor for adjusting output gain；For adjusting power amplifier
Amplification factor.
Detailed description of the invention
Fig. 1 is the circuit diagram that volume amplified signal is acquired in the utility model；
Fig. 2 is the circuit diagram that loudspeaker are mute in the utility model；
Fig. 3 is the functional block diagram that mobile phone is transferred in the utility model.
Specific embodiment
Understand to remove the purpose of this utility model, technical solution and advantage more, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As shown in Figure 1, Figure 2 and Figure 3, a kind of earphone, main control chip and loudspeaker SPK including electrical connection, main control chip pass
Transfer audio signal to loudspeaker two output ends；Further include audio detection circuit and switching circuit, wherein audio detection circuit with
Two output ends of loudspeaker connect incoming audio signal, and audio signal is compared with default audio signal, and according to than
Relatively result exports corresponding detection signal, and herein, detection signal is digital signal high level and low level；Wherein switching circuit
Control terminal connect access detection signal, two output ends connection of input terminal and loudspeaker, output end ground connection with audio detection circuit；
Switching circuit is grounded according to two output ends of detection signal conduction then loudspeaker, and switching circuit disconnects then loudspeaker according to detection signal
Two output end incoming audio signals.Main control chip connect access detection signal with audio detection circuit in the present embodiment, and
The terminal device that corresponding adjusting signal volume gives earphone connection is transmitted according to detection signal.Presetting audio in the present embodiment
Signal is max volume audio signal, also may be set to 80%, 90% etc. of max volume certainly.
The utility model earphone in use, the audio signal for being transmitted to loudspeaker is not stopped to acquire by audio detection circuit, once
Audio signal volume is adjusted to maximum, will be immediately detected by audio detection circuit, can export corresponding detection signal MUTE_
CTRL, such as high level；Detection signal MUTE_CTRL is transferred to switching circuit and main control chip respectively.When switching circuit
After control terminal receives high level, input terminal and output end conducting are grounded two output ends of loudspeaker, realize that loudspeaker are mute,
Protect wearer.After main control chip receives the high level from audio detection circuit, corresponding volume adjustment is transmitted
Signal is to terminal device, and for terminal device from main regulation volume to default value, default value can be the one third of max volume.Volume
When normal, audio detection circuit exports low level, and switching circuit disconnects, and audio signal normal transmission goes to play to loudspeaker.Therefore
The earphone of the utility model will not increase user experience there is a situation where volume adjustment to maximum.
It should be noted that: the earphone of the present embodiment is wired earphone, and wired earphone is set by USB interface and terminal
Standby to communicate, terminal device is mobile phone in this example.Certainly, earphone is unlimited listed above, and wireless headset can also.
As shown in Figure 1, the wired earphone of this example is internally provided with for providing the battery of operating voltage, and electric with battery
The power management module of connection, battery provide corresponding operating voltage to each circuit by power management module, for example, being power amplifier
Circuit provide operating voltage APVDD, provide operating voltage CAVDD for voltage comparator circuit, and be supplied to divider resistance R4 with
The VD of divider resistance R5 partial pressure.
The particular circuit configurations of the audio detection circuit of the present embodiment are as follows:
Audio detection circuit includes power amplifier, rectification circuit and the voltage comparator circuit with reference voltage, with reference to electricity
Pressure is the corresponding d. c. voltage signal of max volume audio signal；
Wherein, power amplifier includes power amplifier chips U1, the output that input terminal IN+ passes through gain resistor R1 and loudspeaker
End connection, is used for incoming audio signal SPK+；Input terminal IN- is connected by an output end of gain resistor R2 and loudspeaker, is used
In incoming audio signal SPK-；Enable end EN meets voltage APVDD by enabled resistance R3, herein draws high enable end EN current potential,
Keep power amplifier chips U1 in running order；The end BYPASS is grounded through capacitor C1, and ground terminal GND ground connection, power end VDD connects voltage
APVDD, output end OUT+ and output end OUT- are connected with the rectifying circuit.
Wherein, rectification circuit includes rectification chip U2, and input terminal AC+ is connect with power amplifier chips U1 output end OUT+, defeated
Enter to hold AC- to connect with power amplifier chips U1 output end OUT-, ground terminal GND ground connection, output end OUT exports d. c. voltage signal
DCOUT gives π type filter circuit, and π type filter circuit includes the filter inductance being serially connected between rectification circuit and voltage comparator circuit
One end of L1, filter inductance L1 are grounded through filter capacitor C2, and the other end is grounded through filter capacitor C3.
Wherein, voltage comparator circuit includes voltage comparable chip U3, and normal phase input end IN+ is connect with filter inductance L1,
D. c. voltage signal DCOUT is accessed, inverting input terminal IN- is connect with the connecting pin of divider resistance R4 and divider resistance R5, is divided
One end of resistance R4 is connect with voltage VDD, one end ground connection of divider resistance R5；The reference voltage of voltage comparator circuit is by partial pressure electricity
It hinders R4 and divider resistance R5 and acquisition is divided to voltage VDD.The voltage end VDD of voltage comparable chip U3 connects voltage CAVDD, ground terminal
GND ground connection, output end OUT output detection signal MUTE_CTRL.
As shown in Fig. 2, the switching circuit of the present embodiment and the circuit connecting relation of loudspeaker SPK are as follows:
Switching circuit includes triode Q1 and triode Q2, the base stage and the output end of voltage comparable chip U3 of triode Q1
OUT connection, access detection signal MUTE_CTRL；One output end SPKP_OUT connection of collector and loudspeaker, emitter connect
Ground；The base stage of triode Q2 is connect with the output end OUT of voltage comparable chip U3, access detection signal MUTE_CTRL, collector
It is connect with the another output SPKN_OUT of loudspeaker, emitter ground connection.
It is serially connected with filter capacitor C4 between the output end SPKP_OUT and main control chip of loudspeaker, another of loudspeaker is defeated
Filter capacitor C5 is serially connected between outlet SPKN_OUT and main control chip.Herein, filter capacitor C4, filter capacitor C5 are used to be isolated
Audio signal SPK- and loudspeaker output end SPK_OUT- is isolated in audio signal SPK+ and loudspeaker output end SPK_OUT+.
As shown in Figure 1, Figure 2 and Figure 3, the working principle of the present embodiment are as follows:
Audio signal SPK+ and audio signal SPK- are transmitted to power amplifier chips U1, by defeated after power amplifier chips U1 amplification
Outlet VO1 and output end VO2 is transmitted to the input terminal AC+ and input terminal AC- of rectification chip U2, rectifies by rectification chip U2
Afterwards from output end OUT output d. c. voltage signal DCOUT, d. c. voltage signal DCOUT after the filtering of π type filter circuit,
It is transmitted to voltage comparable chip U3, d. c. voltage signal DCOUT is compared by voltage comparable chip U3 with reference voltage, if greatly
In reference voltage, then output end OUT exports high level, otherwise exports low level.When exporting high level, show audio signal sound
Amount is brought to maximum, at this point, triode Q1 and triode Q2 are both turned on, makes the output end SPK_OUT+ and output end SPK_ of loudspeaker
OUT- ground connection, loudspeaker SPK is muted, and is isolated with audio signal SPK+ and audio signal SPK-, and deafening situation will not occur.
Meanwhile high level is transferred to main control chip, main control chip is transmitted by USB interface adjusts volume to the corresponding telecommunications of default value
Number give mobile phone, mobile phone then automatic regulating volume export.At this point, audio signal SPK+ and audio signal SPK- is by audio detection electricity
After the detection of road, it will not be isolated, normally be exported by loudspeaker.
The preferred embodiment of the utility model described above, is not intended to limit the utility model, all practical at this
Made any modification within novel spirit and principle, etc. the improvement of same Headphone structure etc., should be included in practical
Within novel protection scope.
Claims (9)
1. a kind of earphone, main control chip and loudspeaker including electrical connection, the main control chip transmit audio signal to the two of loudspeaker
A output end, which is characterized in that further include:
Two output ends of audio detection circuit, the audio detection circuit and loudspeaker connect incoming audio signal, and by audio
Signal is compared with default audio signal, exports corresponding detection signal according to comparison result；
Switching circuit, the control terminal of the switching circuit connect with the audio detection circuit access detection signal, input terminal with
Two output ends of loudspeaker connect, output end ground connection；The switching circuit is according to two of detection signal conduction then loudspeaker
Output end ground connection, the switching circuit disconnect two output end incoming audio signals of the then loudspeaker according to detection signal.
2. earphone according to claim 1, which is characterized in that the main control chip connect with the audio detection circuit and connects
Enter and detect signal, and the terminal device that corresponding adjusting signal volume gives the earphone connection is transmitted according to detection signal.
3. earphone according to claim 1, which is characterized in that the audio detection circuit includes power amplifier, rectified current
Road and voltage comparator circuit with reference voltage, reference voltage are the corresponding d. c. voltage signal of max volume audio signal；
Wherein, the input terminal incoming audio signal of power amplifier, the audio signal are transmitted to rectification after power amplifier amplifies
Circuit is shaped to d. c. voltage signal, and input voltage comparison circuit by rectification circuit, by voltage comparator circuit by DC voltage
Signal is compared with reference voltage, and exports corresponding detection signal by output end.
4. earphone according to claim 1, which is characterized in that
It is serially connected with filter capacitor C4 between one output end of the loudspeaker and the main control chip,
Filter capacitor C5 is serially connected between the another output of the loudspeaker and the main control chip.
5. earphone according to claim 3, which is characterized in that the reference voltage of the voltage comparator circuit is divided by what is concatenated
Piezoresistance R4 and divider resistance R5 is obtained by partial pressure.
6. earphone according to claim 3, which is characterized in that the switching circuit includes triode Q1 and triode Q2,
The base stage of triode Q1 is connect with the output end of the voltage comparator circuit, an output end of collector and the loudspeaker
Connection, emitter ground connection；
The base stage of triode Q2 is connect with the output end of the voltage comparator circuit, another output of collector and the loudspeaker
End connection, emitter ground connection.
7. earphone according to claim 3, which is characterized in that be provided with π type between rectification circuit and voltage comparator circuit
Filter circuit, π type filter circuit include the filter inductance L1 being serially connected between rectification circuit and voltage comparator circuit, the filtered electrical
One end of sense L1 is grounded through filter capacitor C2, and the other end is grounded through filter capacitor C3.
8. earphone according to claim 3, which is characterized in that the input terminal of power amplifier is serially connected with to be increased for adjusting output
The gain resistor of benefit.
9. earphone according to any one of claims 1 to 8, which is characterized in that the earphone is wired earphone, described wired
Earphone passes through USB interface and terminal equipment in communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822164098.0U CN209151333U (en) | 2018-12-21 | 2018-12-21 | A kind of earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822164098.0U CN209151333U (en) | 2018-12-21 | 2018-12-21 | A kind of earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209151333U true CN209151333U (en) | 2019-07-23 |
Family
ID=67290627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822164098.0U Active CN209151333U (en) | 2018-12-21 | 2018-12-21 | A kind of earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209151333U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381409A (en) * | 2019-08-13 | 2019-10-25 | 京东方科技集团股份有限公司 | A kind of control panel of display, its driving method and display |
| CN113434112A (en) * | 2021-07-24 | 2021-09-24 | 深圳市八达晟电子有限公司 | Audio product on-off and loudspeaker mute protector and control method |
-
2018
- 2018-12-21 CN CN201822164098.0U patent/CN209151333U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110381409A (en) * | 2019-08-13 | 2019-10-25 | 京东方科技集团股份有限公司 | A kind of control panel of display, its driving method and display |
| CN113434112A (en) * | 2021-07-24 | 2021-09-24 | 深圳市八达晟电子有限公司 | Audio product on-off and loudspeaker mute protector and control method |
| CN113434112B (en) * | 2021-07-24 | 2023-09-22 | 深圳市八达晟电子有限公司 | Audio product on-off and loudspeaker mute protector and control method |
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