CN217216877U - POP sound eliminating circuit and electronic equipment - Google Patents
POP sound eliminating circuit and electronic equipment Download PDFInfo
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- CN217216877U CN217216877U CN202220619584.0U CN202220619584U CN217216877U CN 217216877 U CN217216877 U CN 217216877U CN 202220619584 U CN202220619584 U CN 202220619584U CN 217216877 U CN217216877 U CN 217216877U
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Abstract
The utility model provides a POP sound elimination circuit and electronic equipment, include: a first muting circuit, a second muting circuit and a control circuit; the input end of the first silencing circuit is used for connecting the left sound channel output end of the sound card, and the output end of the first silencing circuit is used for connecting a left sound channel contact point of the earphone terminal; the input end of the second silencing circuit is used for connecting the right sound channel output end of the sound card, and the output end of the second silencing circuit is used for connecting a right sound channel contact point of the earphone terminal; the input end of the control circuit is used for being connected with the output end of the controller, and the output end of the control circuit is connected with the control ends of the first silencing circuit and the second silencing circuit. The problem that POP sound can be generated in the power-down and power-on processes of the earphone interface in the prior art is solved.
Description
Technical Field
The utility model relates to an electronic circuit field, in particular to POP sound elimination circuit and electronic equipment.
Background
At present, devices in the market, such as a notebook computer, a tablet computer, an all-in-one machine, a computer host and the like are all configured with earphone interfaces, when the earphones are used, the excellent experience feeling can be brought, meanwhile, the environment noise cannot be caused to other people when the earphones are worn, however, in the using process, if the POP sound is generated in the instant of power-off/power-on/abnormal power-off, the POP sound can generate harsh POP sound, troubles are brought to users, and certain damage can be caused to the auditory sense of human ears in serious cases.
In view of this, the present application is presented.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a POP sound cancelling circuit and electronic equipment aims at solving the earphone interface among the prior art and can produce the problem of POP sound at the in-process that falls electric and go up the electricity.
The utility model discloses a first embodiment provides a POP sound elimination circuit, include: a first muting circuit, a second muting circuit and a control circuit;
the input end of the first silencing circuit is used for being connected with the left sound channel output end of the sound card, and the output end of the first silencing circuit is used for being connected with a left sound channel contact point of the earphone terminal;
the input end of the second silencing circuit is used for connecting the right sound channel output end of the sound card, and the output end of the second silencing circuit is used for connecting a right sound channel contact point of the earphone terminal;
the input end of the control circuit is used for being connected with the output end of the controller, and the output end of the control circuit is connected with the control ends of the first silencing circuit and the second silencing circuit.
In one possible embodiment of the present invention, the first noise cancellation circuit includes: a first field effect transistor;
the D pole of the first field effect tube is electrically connected with the left sound channel output end of the sound card, the S pole of the first field effect tube is electrically connected with the left sound channel contact point of the earphone terminal, and the G pole of the first field effect tube is electrically connected with the output end of the control circuit.
In one possible embodiment of the present invention, the second silencing circuit includes: a second field effect transistor;
the D pole of the second field effect tube is electrically connected with the right sound channel output end of the sound card, the S pole of the second field effect tube is electrically connected with the right sound channel contact point of the earphone terminal, and the G pole of the second field effect tube is electrically connected with the output end of the control circuit.
In one possible embodiment of the present invention, the control circuit includes a first resistor;
the first end of the first resistor is electrically connected with the G pole of the first field effect transistor, the first end of the first resistor is electrically connected with the G pole of the second field effect transistor, and the second end of the first resistor is grounded.
In one possible embodiment of the present invention, the first field effect transistor is an NMOS transistor.
In a possible embodiment of the present invention, the second fet is an NMOS transistor.
A second embodiment of the utility model provides an electronic equipment, including controller, sound card, earphone terminal and as above arbitrary a POP sound elimination circuit, wherein, the output of controller passes through control circuit with first amortization circuit's control end second amortization circuit's control end electric connection, the sound card passes through first amortization circuit second amortization circuit with earphone terminal electric connection.
Based on the POP sound eliminating circuit and the electronic equipment provided by the utility model, the controller of the electronic equipment is connected with the control ends of the first silencing circuit and the second silencing circuit through the control circuit, the sound card of the electronic equipment is electrically connected with the earphone terminal through the first silencing circuit and the second silencing circuit, wherein the controller controls the first and second silencing circuits to operate between an open state and a closed state through the control circuit, in the on state, the earphone connected to the earphone terminal can receive the audio information, and in the off state, the earphone connected to the earphone terminal cannot receive the audio information, specifically, the first silencing circuit and the second silencing circuit can be in a closed state in advance in the three stages of starting up/shutting down/forced shutting down of the electronic equipment, and poor earphone use experience caused by generation of POP sound to a user can be effectively avoided.
Drawings
Fig. 1 is a schematic structural diagram of a POP sound cancellation circuit according to a first embodiment of the present invention;
fig. 2 is a schematic block diagram of an electronic device according to a second embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The utility model discloses a POP sound cancelling circuit and electronic equipment aims at solving the earphone interface among the prior art and can produce the problem of POP sound at the in-process that falls electric and go up the electricity.
Referring to fig. 1 and 2, a first embodiment of the present invention provides a POP sound cancellation circuit, including: a first muting circuit 3, a second muting circuit 4, and a control circuit 2;
the input end of the first silencing circuit 3 is used for connecting the left sound channel output end of the sound card, and the output end of the first silencing circuit 3 is used for connecting the left sound channel contact point of the earphone terminal 5;
the input end of the second silencing circuit 4 is used for connecting the right sound channel output end of the sound card, and the output end of the second silencing circuit 4 is used for connecting the right sound channel contact point of the earphone terminal 5;
the input end of the control circuit 2 is used for connecting the output end of the controller 1, and the output end of the control circuit 2 is connected with the control ends of the first silencing circuit 3 and the second silencing circuit 4.
It should be noted that, the inventor finds that, in the use process of the earphone, if the electronic device is powered off or powered on or powered off abnormally, a harsh POP sound is generated, which causes a trouble to the user and may cause a certain damage to the hearing of the human ear in serious cases.
In this embodiment, the controller 1 of the electronic device may be connected to the control terminals of the first and second sound-deadening circuits 3 and 4 through the control circuit 2, the sound card of the electronic device may be electrically connected to the earphone terminal 5 through the first and second sound-deadening circuits 3 and 4, wherein the controller 1 controls the first and second silencing circuits 3 and 4 to operate between an opening state and a closing state through the control circuit 2, in the on state, the earphone connected to the earphone terminal 5 can receive the audio information, and in the off state, the earphone connected to the earphone terminal 5 cannot receive the audio information, specifically, the first silencing circuit 3 and the second silencing circuit 4 can be in a closed state in advance in the three stages of power-on/power-off/forced power-off of the electronic equipment, and poor earphone use experience of a user caused by the generation of POP sound can be effectively avoided.
Referring to fig. 1, in one possible embodiment of the present invention, the first noise cancellation circuit 3 includes: a first field effect transistor;
the D pole of the first field effect transistor is electrically connected with the left sound channel output end of the sound card, the S pole of the first field effect transistor is electrically connected with the left sound channel contact point of the earphone terminal 5, and the G pole of the first field effect transistor is electrically connected with the output end of the control circuit 2.
In a possible embodiment of the present invention, the second silencing circuit 4 includes: a second field effect transistor;
the D pole of the second field effect transistor is electrically connected with the right sound channel output end of the sound card, the S pole of the second field effect transistor is electrically connected with the right sound channel contact point of the earphone terminal 5, and the G pole of the second field effect transistor is electrically connected with the output end of the control circuit 2.
It should be noted that, in this embodiment, the sound card (CODEC) of the electronic device directly outputs the headphone left channel signal (HPOUT _ L)/right channel signal (HPOUT _ R), such as the a point, the B point, the HP _ OUT _ R _ CON, the HP _ OUT _ L _ CON, and the headphone terminal 5PIN, such as the C point, the D point;
a first field effect transistor (NMOS) is connected in series between A and C, HPOUT _ R is connected with the 3 rd pin of the first field effect transistor, HP _ OUT _ R _ CON is connected with the 2 nd pin of the first field effect transistor, and Control is connected with the 1 st pin of the first field effect transistor.
A second field effect tube (NMOS) is connected in series between B and D, HPOUT _ L is connected with the 3 rd pin of the second field effect tube, HP _ OUT _ L _ CON is connected with the 2 nd pin of the second field effect tube, and Control is connected with the 1 st pin of the second field effect tube.
In this embodiment, the first field effect transistor and the second field effect transistor are both NMOS, and when a high level is input from the 1 st pin, both the first field effect transistor and the second field effect transistor may be turned on, and when a low level is input from the 1 st pin, both the first field effect transistor and the second field effect transistor may be turned off. In this embodiment, the parameters of the first field effect transistor and the second field effect transistor may be: 07.02.68.019001-183MOSFET N-CHANNEL CJ 340040 m Ω @4.5V 30V 5.8A SOT-23 LEAD-FREE-183.
Specifically, in this embodiment, during the power-on process of the electronic device, a low level signal may be applied to the first fet and the second fet, so that the a-C path is disconnected and the B-D path is disconnected, that is, the left and right channels of HP _ OUT _ R _ CON and HP _ OUT _ L _ CON do not sound, at this time, even if the power amplifier is suddenly powered on, the earphone does not emit sound, and after the power-on of the time sequence is completed, the point E is controlled to be a high point, that is, the earphone outputs normally.
In this embodiment, when the electronic device detects a shutdown signal or a forced shutdown signal, it may first send a low level signal only between the first fet and the second fet, so that the a-C path is disconnected and the B-D path is disconnected, that is, the left and right channels of HP _ OUT _ R _ CON and HP _ OUT _ L _ CON do not sound, and at this time, even if the power amplifier suddenly powers off, the earphone does not emit sound.
In a possible embodiment of the invention, the control circuit 2 comprises a first resistor;
the first end of the first resistor is electrically connected with the output end of the controller 1, the first end of the first resistor is electrically connected with the G pole of the first field effect transistor, the first end of the first resistor is electrically connected with the G pole of the second field effect transistor, and the second end of the first resistor is grounded.
It should be noted that the control circuit 2 can be regarded as a pull-down circuit, so that the first fet and the second fet can be turned off instantaneously when receiving a low signal.
Referring to fig. 2, a second embodiment of the present invention provides an electronic device, including a controller 1, a sound card, an earphone terminal 5, and a POP sound cancellation circuit as described above, wherein an output end of the controller 1 is electrically connected to a control end of the first noise cancellation circuit 3 and a control end of the second noise cancellation circuit 4 through the control circuit 2, and the sound card is electrically connected to the earphone terminal 5 through the first noise cancellation circuit 3 and the second noise cancellation circuit 4.
It should be noted that the controller 1 may be a control unit inside the electronic device, for example, the model may be QFN32_0D4_ H0D8_ T2D7X2D7, which is not limited herein, but these aspects are all within the scope of the present invention.
Based on the POP sound eliminating circuit and the electronic equipment provided by the utility model, a controller 1 of the electronic equipment is connected with control ends of a first silencing circuit 3 and a second silencing circuit 4 through a control circuit 2, a sound card of the electronic equipment is electrically connected with an earphone terminal 5 through the first silencing circuit 3 and the second silencing circuit 4, wherein, the controller 1 controls the first silencing circuit 3 and the second silencing circuit 4 to operate between an open state and a closed state through the control circuit 2, an earphone connected on the earphone terminal 5 can receive audio information in the open state, an earphone connected on the earphone terminal 5 can not receive audio information in the closed state, particularly, the first silencing circuit 3 and the second silencing circuit 4 can be in the closed state in advance in three stages of power-on/power-off/forced power-off of the electronic equipment, the earphone using experience that the generation of POP sound causes a bad effect on a user can be effectively avoided.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.
Claims (7)
1. A POP sound cancellation circuit, comprising: a first muting circuit, a second muting circuit and a control circuit;
the input end of the first silencing circuit is used for being connected with the left sound channel output end of the sound card, and the output end of the first silencing circuit is used for being connected with a left sound channel contact point of the earphone terminal;
the input end of the second silencing circuit is used for connecting the right sound channel output end of the sound card, and the output end of the second silencing circuit is used for connecting a right sound channel contact point of the earphone terminal;
the input end of the control circuit is used for being connected with the output end of the controller, and the output end of the control circuit is connected with the control ends of the first silencing circuit and the second silencing circuit.
2. The POP sound cancellation circuit of claim 1, wherein the first muting circuit comprises: a first field effect transistor;
the D pole of the first field effect tube is electrically connected with the left sound channel output end of the sound card, the S pole of the first field effect tube is electrically connected with the left sound channel contact point of the earphone terminal, and the G pole of the first field effect tube is electrically connected with the output end of the control circuit.
3. The POP sound cancellation circuit of claim 2, wherein the second muting circuit comprises: a second field effect transistor;
the D pole of the second field effect tube is electrically connected with the right sound channel output end of the sound card, the S pole of the second field effect tube is electrically connected with the right sound channel contact point of the earphone terminal, and the G pole of the second field effect tube is electrically connected with the output end of the control circuit.
4. The POP sound elimination circuit of claim 3, wherein the control circuit comprises a first resistor;
the first end of the first resistor is electrically connected with the G pole of the first field effect transistor, the first end of the first resistor is electrically connected with the G pole of the second field effect transistor, and the second end of the first resistor is grounded.
5. The POP sound eliminating circuit of claim 2, wherein the first field effect transistor is an NMOS transistor.
6. The POP sound eliminating circuit of claim 3, wherein the second field effect transistor is an NMOS transistor.
7. An electronic device, comprising a controller, a sound card, an earphone terminal, and a POP sound cancellation circuit according to any one of claims 1 to 6, wherein an output terminal of the controller is electrically connected to a control terminal of the first muting circuit and a control terminal of the second muting circuit via the control circuit, and the sound card is electrically connected to the earphone terminal via the first muting circuit and the second muting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220619584.0U CN217216877U (en) | 2022-03-21 | 2022-03-21 | POP sound eliminating circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220619584.0U CN217216877U (en) | 2022-03-21 | 2022-03-21 | POP sound eliminating circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217216877U true CN217216877U (en) | 2022-08-16 |
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ID=82757122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220619584.0U Active CN217216877U (en) | 2022-03-21 | 2022-03-21 | POP sound eliminating circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217216877U (en) |
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2022
- 2022-03-21 CN CN202220619584.0U patent/CN217216877U/en active Active
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