CN217825338U - Earphone noise reduction circuit and earphone - Google Patents
Earphone noise reduction circuit and earphone Download PDFInfo
- Publication number
- CN217825338U CN217825338U CN202221261813.2U CN202221261813U CN217825338U CN 217825338 U CN217825338 U CN 217825338U CN 202221261813 U CN202221261813 U CN 202221261813U CN 217825338 U CN217825338 U CN 217825338U
- Authority
- CN
- China
- Prior art keywords
- pin
- circuit
- switch
- switch circuit
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Headphones And Earphones (AREA)
Abstract
The utility model belongs to the technical field of the technique that the application is applicable to the earphone, the circuit of making an uproar falls in the earphone is provided, including the control signal interface, the audio signal interface, first switch circuit, first player, second switch circuit and second player, first switch circuit's power end and control signal interface connection, first switch circuit's first input is connected with the first sound channel output of audio signal interface, first switch circuit's second input is connected with the earthing terminal of audio signal interface, the positive incoming end of first player is connected with first switch circuit's first output, the negative pole incoming end of first player is connected with first switch circuit's second output. Therefore, the technical problem that the noise of a loudspeaker is large when the earphone of the earphone noise reduction circuit in the prior art is charged and the audio is played simultaneously is solved.
Description
Technical Field
The application belongs to the technical field of earphones, and particularly relates to an earphone noise reduction circuit and an earphone.
Background
In the prior art, many headphones of project production all can require to add the function of 3.5 input mode, insert 3.5's earphone cord and also can normally work as 3.5 earphones when not having the electricity, but normal practice is all directly to link to each other with the loudspeaker through 3.5 earphone seat, can normally use like this, refer to fig. 3 and show, 3.5 earphone seat is directly to be connected with the loudspeaker before the change, the power will have some bigger alternating current ripples to come out and string to loudspeaker through the ground wire of earphone seat when charging just becomes a noise, user experience is very poor.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a circuit and earphone of making an uproar falls in earphone can solve among the prior art the great technical problem of noise of loudspeaker when the earphone charges and the broadcast audio frequency goes on simultaneously.
In a first aspect, an embodiment of the present application provides a noise reduction circuit for a headphone, where the noise reduction circuit for a headphone includes:
the control signal interface is used for accessing a control signal;
the audio signal interface is provided with a grounding terminal, a first sound channel output terminal and a second sound channel output terminal and is used for accessing the first sound channel audio signal and the second sound channel audio signal;
the first switch circuit is provided with a power supply end, a first input end, a second input end, a first output end and a second output end, the power supply end of the first switch circuit is connected with the control signal interface, the first input end of the first switch circuit is connected with the first sound channel output end of the audio signal interface, the second input end of the first switch circuit is connected with the grounding end of the audio signal interface, and the first switch circuit is conducted when the voltage of the control signal is smaller than or equal to a first preset voltage value so as to output a first sound channel audio signal accessed by the audio signal interface;
the first player is provided with a positive electrode access end and a negative electrode access end, the positive electrode access end of the first player is connected with the first output end of the first switch circuit, the negative electrode access end of the first player is connected with the second output end of the first switch circuit, and when the first switch circuit is switched on, the first player plays the first sound channel audio signal;
the second switch circuit is provided with a power supply end, a first input end, a second input end, a first output end and a second output end, the power supply end of the second switch circuit is connected with the control signal interface, the first input end of the second switch circuit is connected with the second channel output end of the audio signal interface, the second input end of the second switch circuit is connected with the grounding end of the audio signal interface, and the second switch circuit is conducted when the voltage of the control signal is smaller than or equal to a first preset voltage value so as to output the second channel audio signal accessed by the audio signal interface;
and the second player is provided with a positive electrode access end and a negative electrode access end, the positive electrode access end of the second player is connected with the first output end of the second switch circuit, the negative electrode access end of the second player is connected with the second output end of the second switch circuit, and when the second switch circuit is switched on, a second sound channel audio signal is played.
In a possible implementation manner of the first aspect, the noise reduction circuit of the earphone further includes an isolation circuit, a first end of the isolation circuit is connected to a ground terminal of the audio signal interface, and a second end of the isolation circuit is grounded.
In a possible implementation manner of the first aspect, the isolation circuit includes a first resistor, a first end of the first resistor is a first end of the isolation circuit, and a second end of the first resistor is a second end of the isolation circuit.
In a possible implementation manner of the first aspect, the first player and the second player are a left channel speaker and a right channel speaker, respectively.
In a possible implementation manner of the first aspect, the first switch circuit includes a first electronic switch, a second resistor, and a first capacitor, the first electronic switch includes a first input pin, a second input pin, a first output pin, a second output pin, a ground pin, a power pin, a first control pin, and a second control pin, the first input pin of the first electronic switch is a first input terminal of the first switch circuit, the second input pin of the first electronic switch is a second input terminal of the first switch circuit, the first output pin of the first electronic switch is a first output terminal of the first switch circuit, the second output pin of the first electronic switch is a second output terminal of the first switch circuit, the ground pin of the first electronic switch is grounded, the first control pin and the second control pin of the first electronic switch are respectively connected to a first end of the second resistor, the power pin of the first electronic switch is respectively connected to a second end of the second resistor and a first end of the first capacitor, and the power pin of the first electronic switch is connected to a power terminal of the first switch circuit; the second end of the first capacitor is grounded.
In a possible implementation manner of the first aspect, the second switch circuit includes a second electronic switch, a third resistor and a second capacitor, the second electronic switch includes a first input pin, a second input pin, a first output pin, a second output pin, a ground pin, a power pin, a first control pin and a second control pin, the first input pin of the second electronic switch is the first input terminal of the first switch circuit, the second input pin of the second electronic switch is the second input terminal of the first switch circuit, the first output pin of the second electronic switch is the first output terminal of the first switch circuit, the second output pin of the second electronic switch is the second output terminal of the first switch circuit, the ground pin of the second electronic switch is grounded, the first control pin and the second control pin of the second electronic switch are respectively connected to the first end of the third resistor, the power pin of the second electronic switch is respectively connected to the second end of the third resistor and the first end of the second capacitor, and the power pin of the second electronic switch is connected to the power terminal of the first switch circuit; and the second end of the second capacitor is grounded.
In a possible implementation manner of the first aspect, the model number of the first electronic switch is DZ553.
In a second aspect, embodiments of the present application provide a headset including the headset noise reduction circuit as described above.
Compared with the prior art, the embodiment of the application has the advantages that:
through the scheme, the control signal interface can be directly isolated from the audio signal interface, the first player and the second player 50 through the first switch circuit and the second switch circuit, so that in the scheme, the control signal is only used as a trigger signal and is not directly accessed to the audio signal interface, the first player and the second player 50, therefore, the electric isolation can be realized through the first switch circuit and the second switch circuit, and the noise generated by current passing is avoided, so that the technical problem that the noise of a loudspeaker is large when the earphone is charged and the audio is played simultaneously in the prior art is solved through the scheme.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic block diagram of a noise reduction circuit for a headset according to an embodiment of the present application;
fig. 2 is a circuit diagram of a noise reduction circuit for a headphone according to an embodiment of the present application;
fig. 3 is a block diagram of a headset of the prior art;
fig. 4 is a schematic diagram of a module of the headset of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if the described condition or event is detected" may be interpreted to mean "upon determining" or "in response to determining" or "upon detecting the described condition or event" or "in response to detecting the described condition or event", depending on the context.
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance. Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather mean "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
The utility model discloses a solve among the prior art earphone and fall circuit of making an uproar earphone and charge and the great technical problem of noise of broadcast audio frequency loudspeaker when going on simultaneously. The utility model provides a circuit and earphone of making an uproar falls in earphone.
In one embodiment, fig. 1 shows a block diagram of an earphone noise reduction circuit provided in the present application, the earphone noise reduction circuit includes a control signal interface VIN, an audio signal interface 10, a first switch circuit 201, a first player 30, a second switch circuit 202, and a second player 50, the audio signal interface 10 has a ground terminal JACK-G, a first channel output terminal JACK-G, and a second channel output terminal JACK-L, the first switch circuit 201 has a power terminal, a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the power terminal of the first switch circuit 201 is connected to the control signal interface VIN, the first input terminal of the first switch circuit 201 is connected to the first channel output terminal of the audio signal interface 10, the second input terminal of the first switch circuit 201 is connected to the ground terminal of the audio signal interface 10, the first player 30 has a positive input terminal and a negative input terminal, the positive input terminal of the first player 30 is connected to the first output terminal of the first switch circuit 201, the negative terminal of the first switch circuit 30 is connected to the ground terminal of the second switch circuit 201, the second switch circuit 201 is connected to the positive input terminal of the second switch circuit 202, the second switch circuit 202 is connected to the second input terminal of the audio signal interface circuit, the second switch circuit 202 is connected to the positive input terminal of the audio signal interface circuit 202, the second switch circuit 202, the negative terminal of the second player 50 is connected to the second output terminal of the second switch circuit 202.
Wherein, the control signal interface VIN is accessed with a control signal; the audio signal interface 10 accesses a first channel audio signal and a second channel audio signal; the first switch circuit 201 is turned on when the voltage of the control signal is less than or equal to a first preset voltage value, so as to output a first channel audio signal accessed by the audio signal interface; when the first switch circuit 201 is turned on, the first player 30 plays the first audio channel audio signal; the second switch circuit 202 is turned on when the voltage of the control signal is less than or equal to a second preset voltage value, so as to output a second channel audio signal accessed by the audio signal interface; when the second switch circuit 202 is turned on, the second player 50 plays the second channel audio signal. In the above scheme, the control signal interface VIN is isolated from the audio signal interface 10 and the first and second players 30 and 50 directly through the first and second switch circuits 201 and 202, so that in the above scheme, the control signal is only used as a trigger signal, and the connection to the audio signal interface 10 and the first and second players 30 and 50 is not directly realized, therefore, the electrical isolation can be realized through the first and second switch circuits 201 and 202, and the noise caused by the passing of current is avoided. Thereby solve the great technical problem of noise of loudspeaker when earphone charges and broadcast audio frequency goes on simultaneously among the prior art. The first preset voltage value and the second preset voltage value are set as needed, and may be equal to each other.
Optionally, the audio signal interface 10 is a 3.5 headphone jack.
In a possible implementation manner of the first aspect, the earphone noise reduction circuit further includes an isolation circuit, a first end of the isolation circuit is connected to the ground terminal of the audio signal interface 10, and a second end of the isolation circuit is grounded.
The isolation circuit can isolate the ground terminal of the audio signal interface 10 from the ground terminals of other circuits, such as a power circuit, so as to further avoid the interference of the connection of the ground terminals of different modules on the audio of the audio signal interface 10, and avoid the noise generated when the first player 30 and the second player 50 are playing. It should be noted that, in general, in the implementation of the headset, the ground terminal of the audio signal interface 10 is generally referred to as the power ground of the headset main board.
In a possible implementation manner of the first aspect, referring to fig. 2, the isolation circuit includes a first resistor R1, a first end of the first resistor R1 is a first end of the isolation circuit, and a second end of the first resistor R1 is a second end of the isolation circuit.
The first resistor R1 can directly isolate the ground terminal of the audio signal interface 10 from other ground terminals, and the ground terminal (power ground) and the ground terminal of the audio signal interface 10 can generate a voltage difference through the first resistor R1, so that the ac text waves from the power ground can be divided and pressed on the first resistor R1, and the ac text wave values divided and pressed at the two ends of the first player 30 and the second player 50 can be effectively reduced by debugging the size of the first resistor R1, thereby obviously optimizing the noise.
In a possible implementation manner of the first aspect, the first player 30 and the second player 50 are a left channel speaker and a right channel speaker, respectively.
In a possible implementation manner of the first aspect, the first switch circuit 201 includes a first electronic switch, a second resistor R2 and a first capacitor C1, the first electronic switch includes a first input pin A3, a second input pin B3, a first output pin A1, a second output pin B1, a ground pin GND, a power pin VCC, a first control pin 1S and a second control pin 2S, the first input pin A3 of the first electronic switch is a first input end of the first switch circuit 201, the second input pin B3 of the first electronic switch is a second input end of the first switch circuit 201, the first output pin A1 of the first electronic switch is a first output end of the first switch circuit 201, the second output pin B1 of the first electronic switch is a second output end of the first switch circuit 201, the ground pin of the first electronic switch is grounded, the first control pin 1S and the second output pin S2 of the first electronic switch are connected to the second resistor R2 of the first electronic switch, the first control pin a first end of the first electronic switch is connected to the first end of the first capacitor C1, and the second terminal of the first electronic switch is connected to the second terminal of the first switch circuit 201; the second end of the first capacitor C1 is grounded.
The first electronic switch isolates the audio signal interface 10 from the first player 30, the second resistor R2 divides voltage, and the first capacitor C1 filters the control signal, thereby ensuring normal operation of the first electronic switch.
In a possible implementation manner of the first aspect, referring to fig. 2, the second switch circuit 202 includes a second electronic switch, a third resistor R3, and a second capacitor C2, the second electronic switch includes a first input pin A3, a second input pin B3, a first output pin A1, a second output pin B1, a ground pin GND, a power pin VCC, a first control pin 1S, and a second control pin 2S, the first input pin A3 of the second electronic switch is a first input end of the first switch circuit 201, the second input pin B3 of the second electronic switch is a second input end of the first switch circuit 201, the first output pin A1 of the second electronic switch is a first output end of the first switch circuit 201, the second output pin B1 of the second electronic switch is a second output end of the first switch circuit 201, the ground pin of the second electronic switch is grounded, the first output pin VCC 1S 2 of the second electronic switch and the second control pin R2 of the second electronic switch are respectively connected to a second end of the resistor R3 and a second end of the second electronic switch, and the second end of the second electronic switch are respectively connected to the first end of the first switch circuit 201, and the second end of the second terminal of the second electronic switch, and the second terminal of the first electronic switch are connected to the first terminal of the first resistor R3; the second end of the second capacitor C2 is grounded.
The second electronic switch isolates the audio signal interface 10 from the second player 50, the third resistor R3 divides voltage, and the second capacitor C2 filters the control signal, so that the normal operation of the second electronic switch is ensured.
In a possible implementation manner of the first aspect, the model number of the first electronic switch is DZ553.
Note that, as shown in fig. 4, the first switch circuit 201 and the second switch circuit 201 may be integrated into the switch chip 20.
The working principle of the present invention is described below with reference to fig. 1, 2 and 4:
u1 and U2 are an electronic switch, have the effect of disconnection and closure, 3.5 earphone seat is generally directly connected with loudspeaker 30, 50 before the change, power 90 will have some bigger exchange text ripples come out and string to loudspeaker through the ground wire has just become a noise when charging, just can separate this noise completely through the connection of this 3.5 earphone seat of control IO mouth disconnection of bluetooth chip 70 and loudspeaker after adding this electronic switch, need not use the earphone when the customer requires to charge and just can realize with this method. When the customer requires to charge, the user can use the 3.5 earphone function, a voltage difference is generated between the ground of the power supply and the ground of the 3.5 earphone seat through the first resistor R1, the alternating current wave which is connected in series with the power supply can be divided and pressed on the first resistor R1, the alternating current wave value which is divided and pressed at the two ends of the loudspeaker can be effectively reduced by debugging the size of the first resistor R1, and the noise can be obviously optimized. Through above-mentioned scheme not only solve among the prior art earphone and fall the great technical problem of noise of circuit earphone charging and broadcast audio frequency when going on simultaneously loudspeaker. And quick discharge can be realized, and the product quality and reliability are improved.
Corresponding to the earphone noise reduction circuit of the above embodiment, the embodiment of the present application further provides an earphone, which includes the earphone noise reduction circuit as above.
It should be noted that because the utility model discloses the earphone has contained foretell earphone and has fallen all embodiments of circuit of making an uproar, consequently the utility model discloses the earphone has foretell earphone and falls all beneficial effects of circuit of making an uproar, and the no longer repeated description is given here.
Optionally, the earphone further comprises a control circuit, and an output end of the control circuit is connected with the control signal interface.
Wherein the control circuit outputs a control signal.
The control circuit is composed of a Bluetooth chip and a switch, the output end of the switch is connected with the controlled end of the first switch circuit and the controlled end of the second switch circuit respectively, the controlled end of the switch is connected with the control signal output end of the Bluetooth chip, and the input end of the switch can be selectively grounded and powered. When the first switch circuit and the second switch circuit are required to be started, the input end of the Bluetooth chip control switch is grounded, namely, the voltage of the control signal is 0V, so that the switch circuit is started. When first switch circuit and second switch circuit disconnection are required, the input of bluetooth chip control switch connects the power, and control signal's voltage is mains voltage promptly to make switch circuit disconnection. Preferably, the power supply is a 3.3v power supply.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A headphone noise reduction circuit, comprising:
the control signal interface is used for accessing a control signal;
the audio signal interface is provided with a grounding terminal, a first sound channel output terminal and a second sound channel output terminal and is used for accessing the first sound channel audio signal and the second sound channel audio signal;
the first switch circuit is provided with a power supply end, a first input end, a second input end, a first output end and a second output end, the power supply end of the first switch circuit is connected with the control signal interface, the first input end of the first switch circuit is connected with the first sound channel output end of the audio signal interface, the second input end of the first switch circuit is connected with the grounding end of the audio signal interface, and the first switch circuit is conducted when the voltage of the control signal is smaller than or equal to a first preset voltage value so as to output a first sound channel audio signal accessed by the audio signal interface;
the first player is provided with a positive electrode access end and a negative electrode access end, the positive electrode access end of the first player is connected with the first output end of the first switch circuit, the negative electrode access end of the first player is connected with the second output end of the first switch circuit, and when the first switch circuit is switched on, the first channel audio signal is played;
the second switch circuit is provided with a power supply end, a first input end, a second input end, a first output end and a second output end, the power supply end of the second switch circuit is connected with the control signal interface, the first input end of the second switch circuit is connected with the second channel output end of the audio signal interface, the second input end of the second switch circuit is connected with the grounding end of the audio signal interface, and the second switch circuit is conducted when the voltage of the control signal is smaller than or equal to a second preset voltage value so as to output the second channel audio signal accessed by the audio signal interface;
and the second player is provided with a positive electrode access end and a negative electrode access end, the positive electrode access end of the second player is connected with the first output end of the second switch circuit, the negative electrode access end of the second player is connected with the second output end of the second switch circuit, and the second player plays the second sound channel audio signal when the second switch circuit is switched on.
2. The headphone noise reduction circuit according to claim 1, further comprising an isolation circuit, a first end of the isolation circuit being connected to a ground terminal of the audio signal interface, a second end of the isolation circuit being connected to ground.
3. The headphone noise reduction circuit according to claim 2, wherein the isolation circuit comprises a first resistor, a first end of the first resistor being a first end of the isolation circuit, a second end of the first resistor being a second end of the isolation circuit.
4. The headphone noise reduction circuit of claim 1, wherein the first player and the second player are a left channel speaker and a right channel speaker, respectively.
5. The headset noise reduction circuit of claim 1, wherein the first switch circuit comprises a first electronic switch, a second resistor, and a first capacitor, the first electronic switch comprises a first input pin, a second input pin, a first output pin, a second output pin, a ground pin, a power pin, a first control pin, and a second control pin, the first input pin of the first electronic switch is the first input terminal of the first switch circuit, the second input pin of the first electronic switch is the second input terminal of the first switch circuit, the first output pin of the first electronic switch is the first output terminal of the first switch circuit, the second output pin of the first electronic switch is the second output terminal of the first switch circuit, the ground pin of the first electronic switch is grounded, the first control pin and the second control pin of the first electronic switch are connected to the first terminal of the second resistor, the power pin of the first electronic switch is connected to the second terminal of the second resistor and the first terminal of the first capacitor, and the power pin of the first electronic switch is connected to the power terminal of the first switch; the second end of the first capacitor is grounded.
6. The headset noise reduction circuit of claim 1, wherein the second switch circuit comprises a second electronic switch, a third resistor and a second capacitor, the second electronic switch comprises a first input pin, a second input pin, a first output pin, a second output pin, a ground pin, a power pin, a first control pin and a second control pin, the first input pin of the second electronic switch is the first input terminal of the first switch circuit, the second input pin of the second electronic switch is the second input terminal of the first switch circuit, the first output pin of the second electronic switch is the first output terminal of the first switch circuit, the second output pin of the second electronic switch is the second output terminal of the first switch circuit, the ground pin of the second electronic switch is grounded, the first control pin and the second control pin of the second electronic switch are respectively connected to the first terminal of the third resistor, the power pin of the second electronic switch is respectively connected to the second terminal of the third resistor and the second terminal of the second capacitor, and the node of the second electronic switch is the power terminal of the first switch; and the second end of the second capacitor is grounded.
7. The headphone noise reduction circuit of claim 5, wherein the first electronic switch is of model number DZ553.
8. A headset characterized in that the headset comprises a headset noise reduction circuit according to any of claims 1-7.
9. The headset of claim 8, wherein the headset further comprises a control circuit, an output of the control circuit being connected to a control signal interface;
the control circuit is used for outputting a control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221261813.2U CN217825338U (en) | 2022-05-24 | 2022-05-24 | Earphone noise reduction circuit and earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221261813.2U CN217825338U (en) | 2022-05-24 | 2022-05-24 | Earphone noise reduction circuit and earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217825338U true CN217825338U (en) | 2022-11-15 |
Family
ID=83986427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221261813.2U Active CN217825338U (en) | 2022-05-24 | 2022-05-24 | Earphone noise reduction circuit and earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217825338U (en) |
-
2022
- 2022-05-24 CN CN202221261813.2U patent/CN217825338U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101610439B (en) | Electronic device | |
| CN101841588B (en) | Audio interface device and electronic device using same | |
| CN103686535B (en) | The terminal and recognition methods of automatic identification ear microphone and karaoke equipment | |
| CN105848028B (en) | Earphone for charging for audio frequency apparatus and be audio frequency apparatus charging method | |
| CN106255003A (en) | Audio process in the operation control method of earphone noise reduction and terminal unit | |
| CN101847859B (en) | Interface apparatus and electronic device using same | |
| CN103188594A (en) | Detection circuit and detection method for earphone | |
| CN106535077A (en) | Earphone test circuit | |
| CN108093329A (en) | Peripheral type detection circuit and mobile terminal based on shared interface | |
| CN106658328B (en) | A kind of earphone test circuit | |
| CN106256138A (en) | A kind of active noise reduction earphone is powered method, Apparatus and system | |
| CN101990144A (en) | Double earphone adapter, main board and method for detecting double earphones | |
| CN105635902A (en) | Audio interface compatible with digital audio device and implementation method | |
| CN102457798A (en) | Audio switching circuit and audio playing device with same | |
| CN103152670A (en) | Audio frequency processing circuit and earphone | |
| CN217825338U (en) | Earphone noise reduction circuit and earphone | |
| CN104883644A (en) | Information processing method and an electronic device | |
| CN205105379U (en) | Bluetooth speaker , voice data line and bluetooth speaker system | |
| CN107800853B (en) | Memory, mobile phone, audio circuit thereof and method for externally playing audio file | |
| CN1855706B (en) | Music reproduction device for portable device | |
| CN205666925U (en) | A earphone for being audio equipment charges | |
| CN215121196U (en) | Earphone hot plug detection circuit, audio circuit and electrical appliance | |
| CN207744133U (en) | A kind of audio input circuit for power amplifier | |
| CN210491157U (en) | Bluetooth earphone | |
| CN216057450U (en) | Audio playing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |