CN218603634U - Microphone filter circuit of earphone - Google Patents
Microphone filter circuit of earphone Download PDFInfo
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- CN218603634U CN218603634U CN202222635712.3U CN202222635712U CN218603634U CN 218603634 U CN218603634 U CN 218603634U CN 202222635712 U CN202222635712 U CN 202222635712U CN 218603634 U CN218603634 U CN 218603634U
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Abstract
The utility model relates to an earphone field, concretely relates to microphone filter circuit of earphone. The earphone comprises a master control IC, the microphone filter circuit comprises an environment microphone and a voice microphone, a power supply pin of the master control IC is respectively connected with power supply ends of the environment microphone and the voice microphone, a first receiving pin and a second receiving pin of the master control IC are respectively connected with output ends of the environment microphone and the voice microphone, and a first filter circuit is arranged between the power supply pin of the master control IC and the power supply end of the environment microphone; and a second filter circuit is arranged between the power supply pin of the main control IC and the power supply end of the voice microphone. The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses the event realizes filtering, steady voltage to the voltage of master control IC output through first filter circuit and second filter circuit, can also realize that the electric current is level and smooth.
Description
Technical Field
The utility model relates to an earphone field, concretely relates to microphone filter circuit of earphone.
Background
The earphone is a pair of conversion units which receive electrical signals from a media player or receiver and convert them into audible sound waves using a speaker proximate to the ear.
Especially, the existing earphone has high integration level, a touch module, an antenna, a wire and the like can generate interference on signals, for example, microphone signals easily cause sound deformation or tremolo, and certainly, the signals can be filtered by a software processing mode, but the problem of a sound source easily causes poor processing effect, and the best sound output effect cannot be achieved.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide a microphone filter circuit of earphone, solve the problem that the earphone that the integrated level is high produces the interference to the sound source easily.
The utility model provides a technical scheme that its technical problem adopted is: the microphone filter circuit of the earphone is provided, the earphone comprises a master control IC, the microphone filter circuit comprises an environment microphone and a voice microphone, a power supply pin of the master control IC is respectively connected with power supply ends of the environment microphone and the voice microphone, a first receiving pin and a second receiving pin of the master control IC are respectively connected with output ends of the environment microphone and the voice microphone, and a first filter circuit is arranged between the power supply pin of the master control IC and the power supply end of the environment microphone; and a second filter circuit is arranged between the power supply pin of the main control IC and the power supply end of the voice microphone.
Wherein, the preferred scheme is: the first filter circuit comprises a first resistor connected between a power supply pin of the main control IC and a power supply end of the environment microphone in series, and a first capacitor or/and a second capacitor connected between the first resistor and the power supply end of the environment microphone in parallel; the second filter circuit comprises a second resistor connected between a power supply pin of the master control IC and a power supply end of the voice microphone in series, and a third capacitor or/and a fourth capacitor connected between the second resistor and the power supply end of the voice microphone in parallel; and the other ends of the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all grounded.
Wherein, the preferred scheme is: the capacitance values of the first capacitor and the third capacitor are between 0.5uf and 2uf, the capacitance values of the second capacitor and the fourth capacitor are between 80nf and 120nf, and the resistance values of the first resistor and the second resistor are between 10 omega and 50 omega.
Wherein, the preferred scheme is: microphone filter circuit includes earphone casing and sets up the first circuit board in earphone casing, master control IC, environment microphone, pronunciation microphone, first filter circuit and second filter circuit all set up on first circuit board, environment microphone and first filter circuit are close to the setting, pronunciation microphone and second filter circuit are close to the setting.
Wherein, the preferred scheme is: the power supply end of the environment microphone is close to the output end of the first filter circuit; and the power supply end of the voice microphone is close to the output end of the second filter circuit.
Wherein, the preferred scheme is: the environment microphone is arranged on the upper side of the first circuit board, and the direction of a sound collecting port of the environment microphone is perpendicular to the first circuit board; the voice microphone is arranged on the lower side or the lower side of the first circuit board, and the direction of a sound collecting port of the voice microphone is perpendicular to the direction of the sound collecting port of the environment microphone.
Wherein, the preferred scheme is: the microphone filter circuit also comprises a second circuit board, wherein the second circuit board is close to or attached to the first circuit board, and comprises an antenna module arranged at the edge and an induction module arranged in the middle area; the antenna module is electrically connected with the antenna circuit or the master control IC on the first circuit board, and the induction module is electrically connected with the induction circuit or the master control IC on the first circuit board.
Wherein, the preferred scheme is: the antenna module is a strip metal layer arranged on the second circuit board, the antenna circuit comprises an antenna IC, and the antenna IC is respectively connected with the strip metal layer and the master control IC; the sensing module is a massive metal layer arranged on the second circuit board and comprises a sensing IC (integrated circuit), and the sensing IC is respectively connected with the massive metal layer and the master control IC.
Wherein, the preferred scheme is: the second circuit board includes that the first mouth of dodging and the second dodges the mouth, the first mouth setting of dodging is in environment microphone department, the second dodges the mouth setting in pronunciation microphone department, environment microphone and pronunciation microphone pass the first mouth of dodging or the second respectively and dodge the outside outstanding setting of mouth.
Wherein, the preferred scheme is: the earphone is characterized in that a conductive structure is arranged on the main body of the earphone, and the ground wire of the first circuit board is connected with the conductive structure through a wire.
The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses the event realizes carrying out filtering, steady voltage to the voltage of master control IC output through first filter circuit and second filter circuit, can also realize that the electric current is level and smooth.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic circuit diagram of a microphone filter circuit of an earphone according to the present invention;
fig. 2 is a schematic circuit diagram of the first filter circuit and the second filter circuit of the present invention;
fig. 3 is a schematic structural diagram of the earphone with the first circuit board according to the present invention;
fig. 4 is a schematic structural diagram of the present invention having a second circuit board.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present invention provides a preferred embodiment of a microphone filter circuit of an earphone.
A microphone filter circuit of an earphone comprises a master control IC100, the microphone filter circuit comprises an environment microphone 310 and a voice microphone 320, a power supply pin 101 of the master control IC100 is respectively connected with a power supply end 311 of the environment microphone 310 and a power supply end 321 of the voice microphone 320, a first receiving pin 102 and a second receiving pin 103 of the master control IC100 are respectively connected with an output end 312 of the environment microphone 310 and an output end 322 of the voice microphone 320, and a first filter circuit 210 is arranged between the power supply pin 101 of the master control IC100 and the power supply end 311 of the environment microphone 310; a second filter circuit 220 is disposed between the power supply pin 101 of the main control IC100 and the power supply terminal 321 of the voice microphone 320.
Specifically, the environment microphone 310 and the voice microphone 320 collect sound information, and transmit related sound information to the main control IC100, and the main control IC100 supplies power to the environment microphone 310 and the voice microphone 320, but the earphone is further provided with a touch-sensitive circuit and an antenna, so that fine interference is easily generated under normal trial, especially, unstable voltage output by the main control IC100 is easily caused, and the collection effect of the microphone is seriously affected, so that the voltage output by the main control IC100 is filtered and stabilized through the first filter circuit 210 and the second filter circuit 220, and current smoothing can also be realized.
In one embodiment, the environmental microphone 310 collects environmental sounds and converts the environmental sounds into corresponding electrical signals to be transmitted to the main control IC100, and similarly, the voice microphone 320 collects user voice sounds and converts the user voice sounds into corresponding electrical signals to be transmitted to the main control IC100, noise reduction is realized by the arrangement of the two microphones, the speaking direction of the caller is accurately calculated by the array formed by the two microphones, and various interference noises in the environment are filtered while the target voice is protected. The working principle is as follows: the gains of the ambient microphone 310 and the speech microphone 320, as well as the time delays of the two microphones, are corrected before the ambient noise filtering module calculation is performed. Then, whether the data collected by the voice microphone 320 is a voice segment is detected, if the data is the voice segment (namely, uplink call), the environmental noise is estimated according to the environmental noise collected by the reference microphone and the voice data of the voice microphone 320, and corresponding noise suppression parameters are calculated, and finally, the environmental noise is filtered by a filter module; otherwise, the environmental noise is not filtered, and the uplink call output is mute.
In one embodiment, a first filter circuit 210 is disposed between the power pin 101 of the main control IC100 and the power terminal 311 of the environmental microphone 310; the second filter circuit 220 is disposed between the power pin 101 of the main control IC100 and the power terminal 321 of the voice microphone 320, and the first filter circuit 210 and the second filter circuit 220 may be the same circuit or different circuits, but the final purpose is to eliminate the power output interference of the power pin 101 of the main control IC 100. Taking the first filter circuit 210 as an example, all electronic components of the first filter circuit 210 may be connected in parallel between the power pin 101 of the main control IC100 and the power terminal of the corresponding microphone, or a part of the electronic components of the first filter circuit 210 may be connected in parallel between the power pin 101 of the main control IC100 and the power terminal of the corresponding microphone and a part of the electronic components may be connected in series between the power pin 101 of the main control IC100 and the power terminal of the corresponding microphone, or all the electronic components of the first filter circuit 210 may be connected in series between the power pin 101 of the main control IC100 and the power terminal of the corresponding microphone.
In a preferred embodiment, the first filter circuit 210 includes a first resistor R1 connected in series between the power pin 101 of the main control IC100 and the power terminal 311 of the environmental microphone 310, and a first capacitor C1 or/and a second capacitor C2 connected in parallel between the first resistor R1 and the power terminal 311 of the environmental microphone 310; the second filter circuit 220 comprises a second resistor R2 connected in series between the power pin 101 of the main control IC100 and the power terminal 321 of the voice microphone 320, and a third capacitor C3 or/and a fourth capacitor C4 connected in parallel between the second resistor R2 and the power terminal 321 of the voice microphone 320; the other ends of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all grounded.
Taking the first filter circuit 210 as an example, by connecting the first resistor R1 in series, when the main control IC100 is broken down, the voltage end is not directly pulled to the ground, and the first resistor R1 prevents the power supply from being short-circuited after the chip is broken down, thereby protecting the power supply; meanwhile, when the voltage suddenly fluctuates relatively and a large pulse voltage is generated instantaneously, the first resistor R1 performs a voltage division function, reduces the voltage input to the environmental microphone 310, and performs a circuit protection function. However, the first resistor R1 itself may generate a certain voltage drop, and the first resistor R1 cannot be too large, and generally takes a value of several tens of ohms, and preferably, for example, the resistance value of the first resistor R1 is 10 Ω to 50 Ω, and is especially selected to be 22 Ω. The function of the second resistor R2 is identical to that of the first resistor R1, and is not described one by one.
Furthermore, the first capacitor C1 or/and the second capacitor C2 have the main functions of stabilizing the power supply voltage, filtering clutter and alternating current components of the power supply, flattening smooth-pulse direct current and storing electric energy; secondly, more than two capacitors are connected in parallel, such as a first capacitor C1 and a second capacitor C2, wherein one of the capacitors is a large capacitor, and if the capacitance value of the first capacitor C1 is between 0.5uf and 2uf, the second capacitor C2 is a capacitor with a smaller capacitance, and is used as a high-frequency decoupling capacitor for filtering high-frequency noise waves in a power supply to prevent the circuit state from generating self-excitation, so that the working state of the circuit is stabilized, the capacitance value of the second capacitor C2 is between 80nf and 120nf, and the value is related to the frequency of the filtered impurities.
Of course, other filter circuits may be used, and even a dedicated filter chip may be provided, so that the size, efficiency, and cost of the filter circuit are balanced. And the utility model discloses a filter circuit adopts above-mentioned scheme, and the electric current surge of the power pin 101 of main control IC100 of mainly considering can not be too big, and antenna or touch-control interference can not be too strong, and the volume of earphone needs to be enough little, still need consider that the unsuitable more expensive chip of adoption cost of overall cost is than.
In one embodiment, the main body of the earphone is provided with a conductive structure, and the ground wire of the circuit board is connected with the conductive structure through a wire. The circuit board is isolated by the shell and sets up, even built-in antenna and touch structure also are built-in the shell, lead to the circuit board to produce static or the bottom line can't outwards electrically conduct easily, consequently, be provided with the conducting structure that can directly contact with the human body in the earphone main part, for example, the earphone includes the ear-hang, the pivot and sets up the earphone portion in the pivot, the earphone portion embeds has first circuit board 410, the outward appearance of pivot is electrically conductive material constitution, as conducting structure, the ground wire of first circuit board 410 is connected with the pivot through a wire, pass the electric charge of ground wire to the human body through the pivot, avoid the emergence of static.
As shown in fig. 3, the present invention provides a preferred embodiment of the first circuit board 410.
The microphone filter circuit comprises an earphone shell and a first circuit board 410 arranged in the earphone shell, the main control IC100, the environment microphone 310, the voice microphone 320, the first filter circuit 210 and the second filter circuit 220 are all arranged on the first circuit board 410, the environment microphone 310 and the first filter circuit 210 are arranged close to each other, and the voice microphone 320 and the second filter circuit 220 are arranged close to each other. Meanwhile, the ground line of the first circuit board 410 is connected to the conductive structure through a wire.
Specifically, all main electronic components are integrally arranged on the first circuit board 410, and the main control IC100, the environment microphone 310, the voice microphone 320, the first filter circuit 210 and the second filter circuit 220 are all arranged on the first circuit board 410, so that the edge earphone is assembled, the production cost is reduced, the process efficiency is improved, and the internal structure of the whole earphone is optimized. And, because it is easy to realize the abnormal charge generated by the wires in the space, the distance between the environment microphone 310 and the first filter circuit 210 is shortened as much as possible, and the distance between the voice microphone 320 and the second filter circuit 220 is also shortened, so the environment microphone 310 is disposed close to the first filter circuit 210, and the voice microphone 320 is disposed close to the second filter circuit 220. Moreover, in actual settings, the environment microphone 310 and the voice microphone 320 need to be disposed at two ends of the first circuit board 410 to satisfy working requirements, and a certain distance is kept, and in order to facilitate circuit layout of the first circuit board 410, the main control IC100 is disposed at a middle position, the main control IC100 is electrically connected to the environment microphone 310 and the voice microphone 320 at two ends through wiring, and the first filter circuit 210 and the second filter circuit 220 are disposed close to corresponding microphones.
Further, the power supply terminal 311 of the environmental microphone 310 is disposed close to the output terminal of the first filter circuit 210; a power supply terminal 321 of the voice microphone 320 is disposed close to the output terminal of the second filter circuit 220. Furthermore, the components of the first filter circuit 210 and the second filter circuit 220 are also disposed in close proximity, so that the components of the ambient microphone 310 and the first filter circuit 210 form a tightly integrated circuit region, and the components of the voice microphone 320 and the second filter circuit 220 form another tightly integrated circuit region.
In one embodiment, the ambient microphone 310 is disposed on the upper side of the first circuit board 410, and the sound collecting port of the ambient microphone 310 is oriented perpendicular to the first circuit board 410; the voice microphone 320 is disposed on the lower side or the lower side of the first circuit board 410, and the sound collecting port of the voice microphone 320 is oriented perpendicular to the sound collecting port of the environment microphone 310. First, the environment microphone 310 and the voice microphone 320 need to be spaced apart enough to be disposed at two end edges of the first circuit board 410, and the voice microphone 320 needs to be disposed close to the mouth for better voice collection, so that it needs to be disposed close to an edge corner, so that the environment microphone 310 is disposed on the upper side of the first circuit board 410, the voice microphone 320 is disposed on the lower side, and the voice microphone 320 needs to be disposed at a lower side, i.e., a corner.
Meanwhile, the collection directions of the environmental microphone 310 and the voice microphone 320 are also limited, and the collection directions must be vertically arranged, so that considering the orientation of the voice microphone 320, the sound collecting port of the voice microphone 320 is necessarily arranged downwards or obliquely towards the mouth, and the sound collecting port of the environmental microphone 310 needs to be arranged perpendicular to the first circuit board 410 and kept perpendicular to the orientation of the sound collecting port of the voice microphone 320. It is a requirement that the collection directions of the environment microphone 310 and the voice microphone 320 must be vertically arranged in the prior art, and the two microphones are arranged, and will not be described in detail.
As shown in fig. 4, the present invention provides a preferred embodiment of the second circuit board 420.
The microphone filter circuit further comprises a second circuit board 420, the second circuit board 420 is arranged close to or attached to the first circuit board 410, and the second circuit board 420 comprises an antenna module arranged at the edge and an induction module arranged in the middle area; the antenna module is electrically connected to the antenna circuit on the first circuit board 410 or the main control IC100, and the sensing module is electrically connected to the sensing circuit on the first circuit board 410 or the main control IC 100.
On one hand, through setting up second circuit board 420, integrated touch-sensitive function in the earphone to set up with antenna integration, reduce inside occupation volume, on the other hand, also be convenient for the assembly of earphone. Preferably, the second circuit board 420 is provided with an FPC for better fitting or for reducing the internal volume. Of course, a PCB board may also be employed. Although such a layout provides great advantages, other problems may also occur, such as interference to the main control IC100 and unstable output power, so that it is necessary to provide the first filter circuit 210 between the power pin 101 of the main control IC100 and the power terminal 311 of the environmental microphone 310, and to provide the second filter circuit 220 between the power pin 101 of the main control IC100 and the power terminal 321 of the voice microphone 320.
In one embodiment, the antenna module is a strip metal layer disposed on the second circuit board 420, and the antenna circuit includes an antenna IC, and the antenna IC is connected to the strip metal layer and the main control IC100 respectively; the sensing module is a metal block layer disposed on the second circuit board 420, and the sensing module includes a sensing IC, and the sensing IC is connected to the metal block layer and the main control IC100, respectively.
Specifically, the second circuit board 420 is provided with a strip metal layer at an edge thereof, which is used as an antenna and is connected to the main control IC100 of the first circuit board 410, and the main control IC100 implements external wireless communication through the strip metal layer; the middle part of the second circuit board 420 is provided with a massive metal layer, which is arranged at the middle part to facilitate direct touch control of a user on the one hand, and is arranged separately from the bar-shaped metal layer on the other hand, so that the area of the second circuit board 420 is utilized on the premise of mutual noninterference as far as possible. When a user's body approaches the bulk metal layer, a capacitance is formed between the bulk metal layer and the body, and corresponding fluctuations are generated, and the master control IC100 recognizes the fluctuations transmitted by the bulk metal layer, thereby performing corresponding control.
In one embodiment, the second circuit board 420 includes a first avoidance port 421 and a second avoidance port 422, the first avoidance port 421 is disposed at the ambient microphone 310, the second avoidance port 422 is disposed at the voice microphone 320, and the ambient microphone 310 and the voice microphone 320 are respectively disposed through the first avoidance port 421 or the second avoidance port 422 to protrude outward.
In order to integrate the devices, the second circuit board 420 needs to be attached to the first circuit board 410 sufficiently, and in this case, a relatively large device or a device requiring a certain physical space, such as a capacitor having a relatively high capacitance value, for example, the ambient microphone 310 and the voice microphone 320, needs a sufficient avoidance space, so that the first avoidance port 421 and the second avoidance port 422 are provided on the second circuit board 420 to avoid the ambient microphone 310 and the voice microphone 320, thereby improving the overall compactness.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is intended to cover all equivalent changes and modifications made within the scope of the present invention.
Claims (10)
1. The utility model provides a microphone filter circuit of earphone, the earphone includes master control IC, microphone filter circuit includes environment microphone and pronunciation microphone, master control IC's power pin is connected with the power end of environment microphone and pronunciation microphone respectively, master control IC's first receiving pin and second receiving pin are connected with the output of environment microphone and pronunciation microphone respectively, its characterized in that:
a first filter circuit is arranged between a power supply pin of the main control IC and a power supply end of the environmental microphone;
and a second filter circuit is arranged between the power supply pin of the main control IC and the power supply end of the voice microphone.
2. The microphone filtering circuit of claim 1, wherein: the first filter circuit comprises a first resistor connected between a power supply pin of the master control IC and a power supply end of the environment microphone in series, and a first capacitor or/and a second capacitor connected between the first resistor and the power supply end of the environment microphone in parallel; the second filter circuit comprises a second resistor connected between a power supply pin of the main control IC and a power supply end of the voice microphone in series, and a third capacitor or/and a fourth capacitor connected between the second resistor and the power supply end of the voice microphone in parallel; and the other ends of the first capacitor, the second capacitor, the third capacitor and the fourth capacitor are all grounded.
3. The microphone filtering circuit of claim 2, wherein: the capacitance values of the first capacitor and the third capacitor are between 0.5uf and 2uf, the capacitance values of the second capacitor and the fourth capacitor are between 80nf and 120nf, and the resistance values of the first resistor and the second resistor are between 10 omega and 50 omega.
4. A microphone filter circuit according to any of claims 1 to 3, characterized in that: microphone filter circuit includes earphone casing and sets up the first circuit board in earphone casing, master control IC, environment microphone, pronunciation microphone, first filter circuit and second filter circuit all set up on first circuit board, environment microphone and first filter circuit are close to the setting, pronunciation microphone and second filter circuit are close to the setting.
5. The microphone filtering circuit of claim 4, wherein: the power supply end of the environment microphone is close to the output end of the first filter circuit; and the power supply end of the voice microphone is close to the output end of the second filter circuit.
6. The microphone filter circuit of claim 4, wherein: the environment microphone is arranged on the upper side of the first circuit board, and the direction of a sound collecting port of the environment microphone is perpendicular to the first circuit board; the voice microphone is arranged on the lower side or the lower side of the first circuit board and close to the edge, and the direction of a sound collecting port of the voice microphone is perpendicular to the direction of a sound collecting port of the environment microphone.
7. The microphone filtering circuit of claim 4, wherein: the microphone filter circuit also comprises a second circuit board, wherein the second circuit board is close to or attached to the first circuit board, and comprises an antenna module arranged at the edge and an induction module arranged in the middle area; the antenna module is electrically connected with the antenna circuit or the master control IC on the first circuit board, and the induction module is electrically connected with the induction circuit or the master control IC on the first circuit board.
8. The microphone filtering circuit of claim 7, wherein: the antenna module is a strip metal layer arranged on the second circuit board, the antenna circuit comprises an antenna IC, and the antenna IC is respectively connected with the strip metal layer and the master control IC; the sensing module is a massive metal layer arranged on the second circuit board and comprises a sensing IC (integrated circuit), and the sensing IC is respectively connected with the massive metal layer and the master control IC.
9. The microphone filtering circuit of claim 7, wherein: the second circuit board includes first dodge mouthful and second dodge the mouth, first dodge mouthful setting in environment microphone department, the mouth setting is dodged in pronunciation microphone department to the second, environment microphone and pronunciation microphone pass first dodge mouthful respectively or the second dodges the outside outstanding setting of mouth.
10. The microphone filter circuit of claim 4, wherein: the earphone comprises a main body and a first circuit board, wherein a conductive structure is arranged on the main body of the earphone, and a ground wire of the first circuit board is connected with the conductive structure through a wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222635712.3U CN218603634U (en) | 2022-09-30 | 2022-09-30 | Microphone filter circuit of earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222635712.3U CN218603634U (en) | 2022-09-30 | 2022-09-30 | Microphone filter circuit of earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218603634U true CN218603634U (en) | 2023-03-10 |
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ID=85400133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222635712.3U Active CN218603634U (en) | 2022-09-30 | 2022-09-30 | Microphone filter circuit of earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218603634U (en) |
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2022
- 2022-09-30 CN CN202222635712.3U patent/CN218603634U/en active Active
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