CN215734804U - Wired bone conduction microphone circuit - Google Patents
Wired bone conduction microphone circuit Download PDFInfo
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- CN215734804U CN215734804U CN202122074797.8U CN202122074797U CN215734804U CN 215734804 U CN215734804 U CN 215734804U CN 202122074797 U CN202122074797 U CN 202122074797U CN 215734804 U CN215734804 U CN 215734804U
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Abstract
The utility model provides a wired bone conduction microphone circuit, which comprises an audio input unit, a power amplification unit, a power supply unit and a power switch, wherein the power supply unit is respectively connected with the audio input unit and the power amplification unit; the power switch is respectively connected with the audio input unit, the power amplification unit and the power supply unit so as to control the on-off of the circuit. The beneficial effects are that: the application amplifies and outputs the vibration signal generated by the bone when speaking through the induction and then the vibration signal is output to the loudspeaker through the power amplifier to output audio, and the surrounding environmental noise is filtered.
Description
Technical Field
The utility model relates to the technical field of charging, in particular to a wired bone conduction microphone circuit.
Background
The technology is innovative, the technology is advanced, and a wired bone conduction microphone loudspeaker in the current market is not available, and is all of a capacitor column type, a silicon microphone, a moving coil type and the like. When the moving-coil microphone, the electret microphone and the silicon microphone are used, ambient noise can be picked up when the sound heads are used and transmitted to the other party to be heard, and the experience of consumers is influenced to a great extent.
SUMMERY OF THE UTILITY MODEL
The present invention overcomes the above-mentioned drawbacks of the prior art and provides a wired bone conduction microphone circuit.
A wired bone conduction microphone circuit comprises an audio input unit, a power amplifier unit, a power supply unit and a power switch, wherein the power supply unit is respectively connected with the audio input unit and the power amplifier unit, the input end of the audio input unit is connected with a bone conduction microphone, and the output end of the audio input unit is connected with the power amplifier unit; the power switch is respectively connected with the audio input unit, the power amplification unit and the power supply unit so as to control the on-off of the circuit.
Optionally, the power supply unit includes a first charging interface, a power chip, a first MOS transistor, and a second MOS transistor, wherein a power input end of the power chip is connected to an external power source through the first charging interface, a power output end of the power chip is respectively connected to a drain of the first MOS transistor and a drain of the second MOS transistor, and a source of the first MOS transistor and a source of the second MOS transistor are connected to each other and form a first power end; and the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with a power switch.
Optionally, the audio input unit includes a first input circuit, a first frequency modulation circuit, and an operational amplifier circuit, an input end of the first input circuit is connected to the bone conduction microphone, and an output end of the first input circuit is output to the power amplifier unit sequentially through the first frequency modulation circuit and the operational amplifier circuit.
Optionally, the first input circuit includes a first interface connected to the bone conduction microphone, the first interface includes a first input end, a first detection end, and a ground end, the first detection end is connected to the power amplification unit, and the ground end is grounded; the first input end is respectively connected with the first frequency modulation circuit and the first filter circuit;
the first filter circuit comprises at least one resistor and at least one capacitor which are connected between the first input end and the first power supply end.
Optionally, the first frequency modulation circuit includes at least one capacitor and a resistor connected between the first input terminal and the operational amplifier circuit.
Optionally, the operational amplifier circuit comprises at least one operational amplifier; the positive phase input end of the operational amplifier is connected with the reference voltage end, the reverse phase input end of the operational amplifier is connected with the output end of the first frequency modulation circuit or the previous operational amplifier, and the output end of the operational amplifier is connected with the power amplification unit or the next operational amplifier; the output end of the operational amplifier is also connected with at least one resistor and at least one capacitor.
Optionally, the audio input unit further includes a second interface connected to the linear input audio, where the second interface includes a second input end, a second detection end, and a ground end, the second detection end is connected to the power amplifier unit, and the ground end is grounded; the second input end is connected with the power amplification unit through at least one resistor and at least one capacitor.
Optionally, the power amplifier unit includes at least one power amplifier chip, the power amplifier chip is provided with a working voltage end connected with the first power end, an audio input end connected with the audio input unit, an audio output end connected with the external sound, and a test end connected with the first detection end or the second detection end, and a test circuit is further connected between the test end and the first detection end or the second detection end;
the testing circuit comprises a first triode, a first resistor and a second resistor, wherein the base electrode of the first triode is respectively connected with the first resistor, a first detection end or a second detection end, the collector electrode of the first triode is connected with the testing end and the second resistor, and the emitting electrode of the first triode is grounded; the other ends of the first resistor and the second resistor are connected with a first power supply end.
Optionally, the power switch is provided with a first connection end, a second connection end, a third connection end, a fourth connection end and a fifth connection end, the first connection end is connected with the output end of the audio input unit, the second connection end and the fourth connection end are grounded, the third connection end is connected with the audio input end, and the fifth connection end is connected with the gate of the first MOS transistor and the gate of the second MOS transistor; and the fourth connecting end and the fifth connecting end are connected through a mechanical switch.
Optionally, the display device further comprises an indication circuit, wherein the indication circuit comprises an indication chip and at least one first indication circuit, the first indication circuit comprises a first diode, a second diode and a third diode,
the power input end of the indication chip is connected with the first power end, the control end of the indication chip is connected with the third diode through the first diode, one end of the second diode is connected with the state output end of the power chip, the other end of the second diode is connected with the third diode, and the other end of the third diode is grounded.
The beneficial effects are that: the application amplifies and outputs the vibration signal generated by the bone when speaking through the induction and then the vibration signal is output to the loudspeaker through the power amplifier to output audio, and the surrounding environmental noise is filtered.
Drawings
Fig. 1 is a schematic circuit diagram of an audio input unit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a power supply unit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a power amplifier unit circuit according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of an indicating circuit of an embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the utility model is further described in detail by the following specific embodiments in combination with the attached drawings:
IN the embodiment shown IN fig. 1 to 4, the present application discloses a wired bone conduction microphone circuit, which includes an AUDIO input unit, a power amplifier unit, a power supply unit, and a power switch SK1, wherein the power supply unit is respectively connected to the AUDIO input unit and the power amplifier unit, an input end of the AUDIO input unit is connected to the bone conduction microphone, and an output end AUDIO-IN of the AUDIO input unit is connected to the power amplifier unit; the power switch SK1 is respectively connected with the audio input unit, the power amplification unit and the power supply unit to control the on-off of the circuit. In this embodiment, the audio input unit of the present application obtains audio input with smaller noise by being connected to the bone conduction microphone, and performs audio amplification output through the power amplification unit. The vibration signal generated by the bone when speaking is sensed and amplified by the power amplifier and then output to the loudspeaker for audio output, and surrounding environmental noise is filtered. The power switch SK1 connects the audio input unit and the power amplifier unit, and turns on the first power supply terminal to the audio input unit and the power amplifier unit, thereby starting the microphone and the loudspeaker.
In some embodiments, the power supply unit includes a first charging interface CN1, a power chip U1, a first MOS transistor Q1, and a second MOS transistor Q2, a power input terminal of the power chip U1 is connected to an external power source through a first charging interface CN1, a power output terminal of the power chip U1 is connected to a drain of the first MOS transistor Q1 and a drain of the second MOS transistor Q2, respectively, and a source of the first MOS transistor Q1 and a source of the second MOS transistor Q2 are connected to each other and form a first power supply terminal; the gate of the first MOS transistor Q1 and the gate of the second MOS transistor Q2 are connected to the power switch SK 1. In this embodiment, the power supply of the external charger is acquired through the first charging interface CN1, and then the externally input power supply is rectified and output through the power chip U1, so that the output voltage is safer and more stable, wherein the power chip U1 may be the power chip U1 with the model 4056. The power output end of the power chip U1 outputs power to the outside through the first MOS transistor Q1 and the second MOS transistor Q2, wherein the first MOS transistor Q1 and the second MOS transistor Q2 are connected with the power switch SK1, and when the power switch SK1 is turned on, the first power supply terminal BAT is turned on with the power output end, and the power is output to the outside. In addition, this application can also set up power supply battery BAT +, and power supply battery BAT +'s positive pole output is connected and is charged at power supply chip U1's power output end, and when first interface CN1 that charges did not charge with the outside and be connected, power supply battery BAT +'s power was conducted with first power end BAT with first MOS pipe Q1, second MOS pipe Q2.
In some embodiments, the audio input unit includes a first input circuit, a first frequency modulation circuit 2, and an operational amplifier circuit 3, an input end of the first input circuit is connected to the bone conduction microphone, and an output end of the first input circuit is output to the power amplifier unit sequentially through the first frequency modulation circuit 2 and the operational amplifier circuit 3. In this embodiment, the audio signal input by the bone conduction microphone is frequency-modulated by the first frequency modulation circuit 2, amplified by the operational amplifier circuit 3, and output to the power amplifier unit, so that the audio signal is more stable and the signal is amplified.
In an implementation manner of the foregoing embodiment, the first input circuit includes a first interface J1 connected to the bone conduction microphone, the first interface J1 includes a first input terminal, a first detection terminal MUTE-EN, and a ground terminal, the first detection terminal MUTE-EN is connected to the power amplification unit, and the ground terminal is grounded; the first input end is respectively connected with the first frequency modulation circuit 2 and the first filter circuit; the first filter circuit 4 includes at least one resistor and one capacitor connected between the first input terminal and a first power supply terminal BAT, as shown in fig. 1. In this embodiment, this application acquires the audio frequency of microphone through first interface J1, and filters through first filter circuit 4, filters unnecessary clutter and makes audio signal more stable.
In some embodiments, the first frequency modulation circuit 2 comprises at least one capacitor and a resistor connected between the first input terminal and the operational amplifier circuit 3. In this embodiment, referring to fig. 1, the present application performs frequency range adjustment by providing a plurality of capacitors and resistors at the first input terminal. The specific adjusting range can be adjusted by setting the number of the capacitors and the resistors or the capacitance value and the resistance value.
In some embodiments, the operational amplifier circuit 3 includes at least one operational amplifier U2; the normal phase input end of the operational amplifier U2 is connected with the reference voltage end, the reverse phase input end is connected with the output end of the first frequency modulation circuit 2 or the previous operational amplifier U2, and the output end is connected with the power amplification unit or the next operational amplifier U2; the output end of the operational amplifier U2 is also connected with at least one resistor and capacitor, see fig. 1. In the present embodiment, the audio signal is amplified by the operational amplifier U2, and in the present embodiment, the number of the operational amplifiers U2 is two, and the audio signal is amplified twice by two operational amplifiers U2. And the output signal is further filtered and stabilized through a resistor and a capacitor. The reference voltage end is formed by voltage division and filtering of a positive electrode output end of a first power supply end BAT or a power supply battery BAT + through a plurality of capacitors and resistors; the specific numerical value is set according to the audio input unit. The operational amplifier can be an operational amplifier with the model number LM 4558.
In some embodiments, the audio input unit further includes a second interface J2 connected to the linear input audio, the second interface J2 includes a second input terminal, a second detection terminal, and a ground terminal, the second detection terminal is connected to the power amplifier unit, and the ground terminal is grounded; the second input end is connected with the power amplification unit through at least one resistor and at least one capacitor. In this embodiment, the audio input unit may output a bone conduction microphone for signal transmission, and may also receive audio signals output by other audio output units through the second interface J2, and the audio signals are filtered and stabilized through a capacitor and a resistor, and then output. The first interface and the second interface can be headset sockets with model number PJ-320D.
In some embodiments, the power amplifier unit includes at least one power amplifier chip U3, the power amplifier chip U3 is provided with a working voltage terminal U3_ PVBAT connected to the first power terminal BAT, an audio input terminal U3_ INP connected to the audio input unit, an audio output terminal U3_ OUTN connected to an external sound, an audio output terminal U3_ OUTP, and a test terminal U3_ CTRL connected to the first detection terminal MUTE-EN or the second detection terminal, and a test circuit is further connected between the test terminal U3_ CTRL and the first detection terminal MUTE-EN or the second detection terminal; the test circuit 5 comprises a first triode Q3, a first resistor R1 and a second resistor R2, wherein the base electrode of the first triode Q3 is respectively connected with the first resistor R1, a first detection end MUTE-EN or a second detection end, the collector electrode of the first triode Q3 is connected with a test end U3_ CTRL and a second resistor R2, and the emitter electrode of the first triode Q3 is grounded; the other ends of the first resistor R1 and the second resistor R2 are connected to a first power supply terminal BAT. In the embodiment, the signal of the audio input unit is received through the audio input end of the power amplifier chip U3, and is output to the external sound equipment through the audio output end U3_ OUTN and the audio output end U3_ OUTP; in the application, the number of the power amplifier chips U3 is two, and the two power amplifier chips U3 are respectively connected with two sound devices or other output devices. The test circuit 5 makes the electric quantity of the first triode Q3 be pulled down by connecting the potential change of the first detection end or the second detection end, thereby judging whether an audio signal is input or not for the power amplifier chip U3. The power amplifier chip U3 may be a chip with a model number of CS 5250.
IN some embodiments, the power switch SK1 is provided with a first connection end SK1_1, a second connection end SK1_2, a third connection end SK1_3, a fourth connection end SK1_4, and a fifth connection end SK1_5, the first connection end SK1_1 is connected to the output end AUDIO-IN of the AUDIO input unit, the second connection end SK1_2 and the fourth connection end SK1_4 are grounded, the third connection end SK1_3 is connected to the AUDIO input end, and the fifth connection end SK1_5 is connected to the gate of the first MOS transistor Q1 and the gate of the second MOS transistor Q2; and the fourth connection end SK1_4 and the fifth connection end SK1_5 are connected through a mechanical switch. In the present embodiment, the power switch SK1 is provided with a five-port mechanical switch. When the mechanical switches of the fourth connection end SK1_4 and the fifth connection end SK1_5 are turned on, the first connection end SK1_1 and the second connection end SK1_2 are turned on, and the level of the fifth connection end SK1_5 is pulled low, so that the first MOS transistor Q1 and the second MOS transistor Q2 are turned on to supply power.
In some embodiments, the indicating circuit further comprises an indicating circuit, the indicating circuit comprises an indicating chip U5 and at least one first indicating circuit 1, the first indicating circuit 1 comprises a first diode D1, a second diode D2 and a third diode D3, a power input terminal of the indicating chip U5 is connected to the first power terminal BAT, a control terminal LEDR1 of the indicating chip U5 is connected to the third diode D3 through the first diode D1, one end of the second diode D2 is connected to a status output terminal of the power chip U1, the other end of the second diode D2 is connected to the third diode D3, and the other end of the third diode D3 is grounded. In this embodiment, this application is provided with two first indicating circuit 1, and two first indicating circuit 1 are connected respectively at two state output of power chip U1, and when power supply battery BAT + when charging, one of them first indicating circuit 1 is lighted, and another first indicating circuit 1 extinguishes and is the red light, then is the blue light when power supply battery BAT + is full of the electricity. The model of the indicating chip U5 may be a chip of PL 5056.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A wired bone conduction microphone circuit is characterized by comprising an audio input unit, a power amplifier unit, a power supply unit and a power switch, wherein the power supply unit is respectively connected with the audio input unit and the power amplifier unit; the power switch is respectively connected with the audio input unit, the power amplification unit and the power supply unit so as to control the on-off of the circuit;
the audio input unit comprises a first input circuit, a first frequency modulation circuit and an operational amplifier circuit, wherein the input end of the first input circuit is connected with the bone conduction microphone, and the output end of the first input circuit is output to the power amplifier unit through the first frequency modulation circuit and the operational amplifier circuit in sequence.
2. The wired bone conduction microphone circuit according to claim 1, wherein the power supply unit comprises a first charging interface, a power chip, a first MOS transistor, and a second MOS transistor, a power input terminal of the power chip is connected to an external power source through the first charging interface, a power output terminal of the power chip is connected to a drain of the first MOS transistor and a drain of the second MOS transistor, respectively, and a source of the first MOS transistor and a source of the second MOS transistor are connected to each other and form a first power supply terminal; and the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with a power switch.
3. The wired bone conduction microphone circuit according to claim 2, wherein the first input circuit comprises a first interface connected to the bone conduction microphone, the first interface comprises a first input terminal, a first detection terminal, and a ground terminal, the first detection terminal is connected to the power amplifier unit, and the ground terminal is grounded; the first input end is respectively connected with the first frequency modulation circuit and the first filter circuit;
the first filter circuit comprises at least one resistor and at least one capacitor which are connected between the first input end and the first power supply end.
4. A wired bone conduction microphone circuit according to claim 3, wherein the first frequency modulation circuit comprises at least one of a capacitor and a resistor connected between the first input terminal and the operational amplifier circuit.
5. The wired bone conduction microphone circuit according to claim 4, wherein the operational amplifier circuit comprises at least one operational amplifier; the positive phase input end of the operational amplifier is connected with the reference voltage end, the reverse phase input end of the operational amplifier is connected with the output end of the first frequency modulation circuit or the previous operational amplifier, and the output end of the operational amplifier is connected with the power amplification unit or the next operational amplifier; the output end of the operational amplifier is also connected with at least one resistor and at least one capacitor.
6. The wired bone conduction microphone circuit according to claim 3, wherein the audio input unit further comprises a second interface connected to the linear input audio, the second interface comprises a second input terminal, a second detection terminal, and a ground terminal, the second detection terminal is connected to the power amplifier unit, and the ground terminal is grounded; the second input end is connected with the power amplification unit through at least one resistor and at least one capacitor.
7. The wired bone conduction microphone circuit according to claim 6, wherein the power amplifier unit comprises at least one power amplifier chip, the power amplifier chip is provided with a working voltage terminal connected to the first power terminal, an audio input terminal connected to the audio input unit, an audio output terminal connected to an external sound, and a test terminal connected to the first test terminal or the second test terminal, and a test circuit is further connected between the test terminal and the first test terminal or the second test terminal;
the testing circuit comprises a first triode, a first resistor and a second resistor, wherein the base electrode of the first triode is respectively connected with the first resistor, a first detection end or a second detection end, the collector electrode of the first triode is connected with the testing end and the second resistor, and the emitting electrode of the first triode is grounded; the other ends of the first resistor and the second resistor are connected with a first power supply end.
8. The wired bone conduction microphone circuit according to claim 7, wherein the power switch is provided with a first connection end, a second connection end, a third connection end, a fourth connection end and a fifth connection end, the first connection end is connected with the output end of the audio input unit, the second connection end and the fourth connection end are grounded, the third connection end is connected with the audio input end, and the fifth connection end is connected with the gate of the first MOS transistor and the gate of the second MOS transistor; and the fourth connecting end and the fifth connecting end are connected through a mechanical switch.
9. The wired bone conduction microphone circuit according to claim 2, further comprising an indication circuit including an indication chip, and at least one first indication circuit including a first diode, a second diode, and a third diode,
the power input end of the indication chip is connected with the first power end, the control end of the indication chip is connected with the third diode through the first diode, one end of the second diode is connected with the state output end of the power chip, the other end of the second diode is connected with the third diode, and the other end of the third diode is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122074797.8U CN215734804U (en) | 2021-08-30 | 2021-08-30 | Wired bone conduction microphone circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122074797.8U CN215734804U (en) | 2021-08-30 | 2021-08-30 | Wired bone conduction microphone circuit |
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| CN215734804U true CN215734804U (en) | 2022-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115361609A (en) * | 2022-08-30 | 2022-11-18 | 歌尔微电子股份有限公司 | Electronic device test circuit and microphone array module |
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2021
- 2021-08-30 CN CN202122074797.8U patent/CN215734804U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115361609A (en) * | 2022-08-30 | 2022-11-18 | 歌尔微电子股份有限公司 | Electronic device test circuit and microphone array module |
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