CN209806082U - Telephone transmitter - Google Patents
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- CN209806082U CN209806082U CN201920873593.0U CN201920873593U CN209806082U CN 209806082 U CN209806082 U CN 209806082U CN 201920873593 U CN201920873593 U CN 201920873593U CN 209806082 U CN209806082 U CN 209806082U
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Abstract
The utility model discloses a transmitter, including first transmitter, second transmitter and circuit board, first transmitter with the second transmitter adopts the directional moving coil type transmitter of the heart type that the structure is the same, first transmitter with the second transmitter sets up back to back symmetry, be equipped with signal processing circuit on the circuit board, signal processing circuit includes operational amplifier at least, the electroacoustic signal that first transmitter gathered passes through the wire transmission extremely operational amplifier's inverting input end, the electroacoustic signal that second transmitter gathered passes through the wire transmission extremely operational amplifier's normal phase input end, operational amplifier's output connection signal leading-out terminal. The utility model discloses can solve the relatively poor problem of anti noise performance.
Description
Technical Field
The utility model relates to an electroacoustic device technical field especially relates to a transmitter.
Background
A moving-coil microphone is a device that converts sound into an electrical signal. The essence of sound is that the sound source vibrates to push air to vibrate, the vibrating diaphragm of the microphone can reciprocate along with the air vibration, the copper coil fixed on the vibrating diaphragm can move along with the vibrating diaphragm, and the magnetic circuit is cut to provide a permanent magnetic field so as to generate an alternating current signal, so that the conversion work from the sound signal to the alternating current signal is realized.
The application field of the moving-coil microphone is very wide, and the moving-coil microphone is a voice acquisition component in voice communication equipment such as telephones, interphones and the like. At present, the moving-coil microphone generally has the problem of poor anti-noise performance, and under a high-noise environment, a large amount of environment noise signals are collected and doped in voice signals, so that the voice definition is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a transmitter to solve the relatively poor problem of anti-noise performance.
The utility model provides a transmitter, includes first microphone, second microphone and circuit board, first microphone with the second microphone adopts the directional moving coil type microphone of the same heart type of structure, first microphone with the second microphone is back-to-back symmetry sets up, be equipped with signal processing circuit on the circuit board, signal processing circuit includes operational amplifier at least, the electroacoustic signal that first microphone was gathered passes through the wire and transmits to operational amplifier's inverting input end, the electroacoustic signal that second microphone was gathered passes through the wire and transmits to operational amplifier's normal phase input end, operational amplifier's output connection signal leading-out terminal.
according to the present invention, two heart-type directional moving-coil microphones with the same structure are symmetrically arranged back to back, the heart-type directional moving-coil microphones have the characteristic that the conversion efficiency of the front signal is much higher than that of the back signal, and simultaneously, according to the non-directional characteristic of the free sound field noise in space, two noise signals collected at the same point are electroacoustic signals with the same sensitivity and phase, so that the external noise signals received by the front and back of the microphone are the same, and the effective voice signal of the front signal is much larger than that of the back signal, that is, two electroacoustic signals with the same position but different effective voice signal strength can be obtained, the two electroacoustic signals are transmitted to a signal processing circuit by a double differential input mode, and the noise elimination processing is performed by an operational amplifier in the signal processing circuit, can effectually offset external noise, the noise reduction effect is obvious, promotes the anti-noise performance of product, and then promotes the pronunciation definition, and in addition, this microphone device realizes with low costsly, and the range of application is extensive, and the practicality is strong.
In addition, according to the present invention, the telephone transmitter may further have the following additional technical features:
Further, the first microphone comprises a first main body part, and a first vibration system and a first magnetic circuit system which are arranged in the first main body part, the second microphone comprises a second main body part, and a second vibration system and a second magnetic circuit system which are arranged in the second main body part, the first main body part and the second main body part are assembled together, the first vibration system and the second vibration system are symmetrically arranged by taking the combination position of the first main body part and the second main body part as a center, and the first magnetic circuit system and the second magnetic circuit system are symmetrically arranged by taking the combination position of the first main body part and the second main body part as a center.
Furthermore, the microphone device further comprises a box cover and a box bottom, wherein a first accommodating cavity and a second accommodating cavity are formed by the box cover and the box bottom in a surrounding mode, the first accommodating cavity is communicated with the second accommodating cavity, the first microphone and the second microphone are located in the first accommodating cavity, and the circuit board is located in the second accommodating cavity.
further, damping films are arranged between the side edge of the box cover and the first microphone and between the side edge of the box cover and the second microphone.
Further, the volume of the first accommodating cavity is larger than that of the second accommodating cavity.
Furthermore, the electroacoustic signal collected by the first microphone is transmitted to the inverting input end of the operational amplifier through two conducting wires, the electroacoustic signal collected by the second microphone is transmitted to the non-inverting input end of the operational amplifier through two conducting wires, and the output end of the operational amplifier is connected with the signal leading-out terminal through two conducting wires.
Furthermore, the operational amplifier adopts an LM6482 dual operational amplifier, and the operational amplifier specifically includes a first LM6482 operational amplifier and a second LM6482 operational amplifier, the electric-acoustic signal collected by the first microphone is transmitted to the inverting input terminal of the first LM6482 operational amplifier through a wire, the electric-acoustic signal collected by the second microphone is transmitted to the non-inverting input terminal of the first LM6482 operational amplifier through a wire, the output terminal of the first LM6482 operational amplifier is connected to the signal leading-out terminal, and the non-inverting input terminal of the first LM6482 operational amplifier is connected to the output terminal of the second LM6482 operational amplifier.
Further, the signal processing circuit further includes a first differential circuit audio input capacitor connected between the first microphone and the inverting input terminal of the first LM6482 operational amplifier, and a second differential circuit audio input capacitor connected between the second microphone and the non-inverting input terminal of the first LM6482 operational amplifier.
Further, the signal processing circuit further includes a first differential circuit input resistor, a second differential circuit input resistor, a first feedback resistor, and a second feedback resistor, where the first differential circuit input resistor is connected between the first differential circuit audio input capacitor and the inverting input terminal of the first LM6482 operational amplifier, the second differential circuit input resistor is connected between the second differential circuit audio input capacitor and the non-inverting input terminal of the first LM6482 operational amplifier, the first feedback resistor is respectively connected to the inverting input terminal of the first LM6482 operational amplifier and the output terminal of the first LM6482 operational amplifier, and the second feedback resistor is respectively connected to the non-inverting input terminal of the first LM6482 operational amplifier and the output terminal of the second LM6482 operational amplifier.
Further, the signal processing circuit further comprises a differential circuit audio output capacitor, and the differential circuit audio output capacitor is connected between the output end of the first LM6482 operational amplifier and the signal leading-out terminal.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Fig. 1 is a schematic structural view of a telephone transmitter according to an embodiment of the present invention after assembly;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic top view of the structure of FIG. 2;
Fig. 4 is a circuit configuration diagram of the signal processing circuit.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
it will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 4, a microphone device according to an embodiment of the present invention includes a first microphone 10, a second microphone 20, and a circuit board 30, wherein the first microphone 10 and the second microphone 20 are heart-shaped directional moving-coil microphones having the same structure, and the heart-shaped directional moving-coil microphones have a characteristic that a front signal conversion efficiency is much higher than a back signal.
The first microphone 10 and the second microphone 20 are symmetrically arranged back to back, a signal processing circuit is arranged on the circuit board 30, the signal processing circuit at least comprises an operational amplifier 31, an electroacoustic signal collected by the first microphone 10 is transmitted to the inverting input end of the operational amplifier 31 through a conducting wire, an electroacoustic signal collected by the second microphone 20 is transmitted to the non-inverting input end of the operational amplifier 31 through a conducting wire, and the output end of the operational amplifier 31 is connected with a signal leading-out terminal 40.
The signals collected when the transmitter is used are as follows: RIN _ V1 (front signal) and RIN _ V2 (back signal), where RIN _ V1 is a noise signal + strong voice mixed signal, RIN _ V2 is a noise signal + weak voice mixed signal, and according to the non-directional characteristic of noise in free space sound field, two noise signals collected at the same point should be two electroacoustic signals with the same sensitivity and phase, and in the transmitter, the first transmitter 10 and the second transmitter 20 are symmetrically arranged back to back, so that the external noise signals received at the front and back sides of the transmitter are the same, and the effective voice signal of the front signal (RIN _ V1) is much larger than the effective voice signal of the back signal RIN _ V2, i.e. two electroacoustic signals with the same position but different effective voice signal strengths can be obtained, and the two electroacoustic signals are transmitted to the signal processing circuit by means of double differential input, and are noise-eliminated by the operational amplifier 31 in the signal processing circuit, can effectually offset external noise, noise reduction effect is obvious, promotes the anti-noise performance of product, and then promotes the pronunciation definition.
specifically, the electroacoustic signal collected by the first microphone 10 is transmitted to the inverting input terminal of the operational amplifier 31 through two wires, the electroacoustic signal collected by the second microphone 20 is transmitted to the non-inverting input terminal of the operational amplifier 31 through two wires, and the output terminal of the operational amplifier 31 is connected to the signal leading-out terminal 40 through two wires. That is, the two electroacoustic signals collected by the first microphone 10 and the second microphone 20 are connected to the circuit board 30 through four single-core connecting wires for signal processing, and then the processed signals are output to the signal leading-out terminal 40 through two connecting wires, where the signal leading-out terminal 40 specifically includes: vout, signal positive + power positive, and GND, signal negative + power negative.
In the present embodiment, the first microphone 10 and the second microphone 20 are specifically 300 ohm double moving coil fully symmetric microphones.
the operational amplifier 31 is an LM6482 dual operational amplifier, the operational amplifier 31 specifically includes a first LM6482 operational amplifier 311 and a second LM6482 operational amplifier 312, the electric-acoustic signal collected by the first microphone 10 is transmitted to the inverting input terminal of the first LM6482 operational amplifier 311 through a wire, the electric-acoustic signal collected by the second microphone 20 is transmitted to the non-inverting input terminal of the first LM6482 operational amplifier 311 through a wire, the output terminal of the first LM6482 operational amplifier 311 is connected to the signal leading-out terminal 40, and the non-inverting input terminal of the first LM6482 operational amplifier 311 is connected to the output terminal of the second LM6482 operational amplifier 312.
The signal processing circuit further includes a first differential circuit audio input capacitance C1 and a second differential circuit audio input capacitance C2, the first differential circuit audio input capacitance C1 being connected between the first microphone 10 and the inverting input of the first LM6482 operational amplifier 311, the second differential circuit audio input capacitance C2 being connected between the second microphone 20 and the non-inverting input of the first LM6482 operational amplifier 311. According to the requirement of frequency response curve, the capacitance values of C1 and C2 can be adjusted properly, and the output frequency response curve of the transmitter can be changed.
The signal processing circuit further comprises a first differential circuit input resistor R1, a second differential circuit input resistor R2, a first feedback resistor R3 and a second feedback resistor R4, wherein the first differential circuit input resistor R1 is connected between the first differential circuit audio input capacitor C1 and the inverting input terminal of the first LM6482 operational amplifier 311, the second differential circuit input resistor R2 is connected between the second differential circuit audio input capacitor C2 and the non-inverting input terminal of the first LM6482 operational amplifier 311, the first feedback resistor R3 is respectively connected with the inverting input terminal of the first LM6482 operational amplifier 311 and the output terminal of the first LM6482 operational amplifier 311, and the second feedback resistor R4 is respectively connected with the non-inverting input terminal of the first LM6482 operational amplifier 311 and the output terminal of the second LM6482 operational amplifier 312. The R1, R2, R3 and R4 together form a gain adjusting part of the differential circuit to adjust the resistance ratio, and the amplification factor of the differential circuit can be adjusted, so that the sensitivity of the transmitter can be adjusted.
The signal processing circuit further includes a differential circuit audio output capacitor C3, the differential circuit audio output capacitor C3 being connected between the output of the first LM6482 operational amplifier 311 and the signal drawing terminal 40. C3 usually takes the value 1UF, and may be larger or richer in low frequency. In this embodiment, the LM6482 dual operational amplifier is specifically a low voltage rail-to-rail dual operational amplifier, where the pins 1, 2, and 3 of the first LM6482 operational amplifier 311 perform differential amplification, the pins 5, 6, and 7 of the second LM6482 operational amplifier 312 perform 1/2 voltage power supply servo, the resistor R5 and the resistor R6 form a 1/2 voltage division sampling circuit, and the voltage is input through the pin 5, and the pin 6 and the pin 7 are short-circuited to output 1/2 power supply voltage for grounding of the resistor R4, so as to achieve a single power supply application of the operational amplifier.
The following explains the principle of the noise reduction processing performed by the signal processing circuit:
1. Considering the LM6482 dual operational amplifier as an ideal operational amplifier, the following formula can be obtained by applying the ' virtual short ' virtual break ' principle:
A non-inverting input terminal: vp Vin 2R 4/(R3+ R4) (1)
(Vin1-Vn)/R1＝(Vn-Vout)/R2 (2)
Vn＝Vp (3)
the following formulas (1), (2) and (3) are combined to obtain:
Vout＝(R1+R1)*R4/R1*(R3+R4)*Vin2-Vin1*R2/R1 (4)
Setting R4/R3 ═ R2/R1, that is, setting the in-phase and anti-phase gains to be the same, results:
Vout＝(R2/R1)*(Vin2-Vin1) (5)
As can be seen from the formula (5): the voltage gain of the double-differential input and single-end output circuit is the ratio of the feedback resistance and the input resistance multiplied by the difference of the same inverted input signal.
Noise is generally a far-field signal, and when the noise is applied to two sound films of a microphone which is closely and symmetrically installed, sound pressure and phase almost coincide, so that the output level signals also have the same amplitude and phase, and Vin2-Vin1 is 0, so that Vout is 0, and no noise is output.
The voice signal of the person wearing the earphone is close, the transmitter faces the mouth in the forward and reverse directions, the near field signal is obtained, the magnitude and the amplitude of the voice signal received by the front and the reverse sides of the transmitter are different, so that the amplitude of Vin2 generated by the moving coil is different from that of Vin1, the difference exists between the two amplitudes, and the circuit is shown by a formula (5) to amplify the voice signal, and the amplification factor is determined by R2 and R1.
2. Analysis of input impedance: assuming that RinV1 is the inverting input resistance value and RinV2 is the non-inverting input resistance value, then:
The non-inverting input resistance of the single-ended output amplifying circuit with double differential inputs is simple and clear, and the non-inverting input resistance of the operational amplifier is not inputted, so that the signal Vin2 only passes through R3 and R4 to the virtual ground, and therefore RinV 2-R3 + R4, R3-10K, R4-510K-RinV2-520K.
The inverting terminal is relatively complex, and if the input signal generates a current I at the inverting terminal,
Then RinV1 Vo/I (6)
And I ═ Vo-Vn)/R1 (7)
And Vp Vin 2R 4/(R3+ R4) (8)
combining the formulas (6), (7) and (8) to obtain:
RinV1＝Vin1*(R3+R4)*R1/(Vin1*R1+Vin1*R4-Vin2*R4) (9)
Setting the differential mode signal to be k1, k1 being Vin2-Vin1, and the common mode signal to be k2, k2 being (Vin1+ Vin2)/2, then:
Rin1＝(2*K2-K1(R3+R4)*R1)/((2*K2-K1)(R3+R4)-(2*K2+K1)R4) (10)
When only the impedance matching effect of the transmission of the voice signal is considered, the common mode signal is ignored, that is, k2 equals 0, resulting in Rin1 equals (R1+ R4) × R1/(R3+2 × R4) (11)
Value of designed resistance by substitution
Rin1＝(10k+510k)*10k/(10k+2*510k)＝5200k/1030k＝5.048k
The circuit is applied to audio amplification (200HZ-4000HZ) and is suitable for the principle that the impedance of an impedance matching signal source is less than five to one tenth of the input impedance of an amplifier, so that the selected 300-ohm microphone meets the requirements of the in-phase and the reverse-phase input. In practical application, because the influence on the gain caused by different input impedances with the same phase inversion is different, the voice is not influenced greatly through practical tests, the anti-noise effect and the conversation definition are good, and the sensitivity can be adjusted through the circuit gain without increasing the circuit bottom noise. Therefore, good voice amplification and anti-noise effects are achieved, the actually measured signal-to-noise ratio reaches 20DB-23DB, the better the microphone symmetry is, the higher the signal-to-noise ratio is, and the background noise can be controlled below 10mvpp when the signal is output as 1 Vpp.
Specifically, in this embodiment, the first microphone 10 includes a first main body 11, and a first vibration system 12 and a first magnetic circuit system 13 which are disposed in the first main body 11, and the second microphone 20 includes a second main body 21, and a second vibration system 22 and a second magnetic circuit system 23 which are disposed in the second main body 21, and the first main body 11 and the second main body 21 are assembled together, specifically, they may be assembled together by glue or by means of a snap.
The first vibration system 12 and the second vibration system 22 are provided symmetrically with respect to the joint position of the first main body 11 and the second main body 21, and the first magnetic circuit system 13 and the second magnetic circuit system 23 are provided symmetrically with respect to the joint position of the first main body 11 and the second main body 21.
in this embodiment, the telephone transmitter further includes a box cover 50 and a box bottom 60, the box cover 50 and the box bottom 60 enclose a first accommodating cavity 71 and a second accommodating cavity 72, the first accommodating cavity 71 is communicated with the second accommodating cavity 72, and specifically, the volume of the first accommodating cavity 71 is greater than the volume of the second accommodating cavity 72.
The first microphone 10 and the second microphone 20 are located in the first accommodation chamber 71, and the circuit board 30 is located in the second accommodation chamber 72.
Preferably, damping films 80 are provided between the side of the cover 50 and the first microphone 10 and between the side of the cover 50 and the second microphone 20.
The microphone device of the embodiment is simple in manufacturing process, the first microphone 10 and the second microphone 20 are assembled together to collect a sound signal, then the circuit board 30 is manufactured according to a signal processing circuit, then the first microphone 10, the second microphone 20 and the circuit board 30 are assembled into the box cover 50 and the box bottom 60 to ensure that the first microphone 10 and the second microphone 20 are symmetrically installed, then the magnetic steel in the magnetic circuit systems of the two microphones is magnetized, the first microphone 10 and the second microphone 20 are connected to corresponding positions on the circuit board 30 through four single-core connecting wires, and then the output end of the circuit board 30 is output to the signal leading-out terminal 40 through two connecting wires.
In summary, according to the present embodiment, two heart-type directional moving-coil microphones with the same structure are symmetrically arranged back to back, and the heart-type directional moving-coil microphone has the characteristic that the front signal conversion efficiency is much higher than that of the back signal, and simultaneously, according to the characteristic that the noise of the free sound field in space is non-directional, two noise signals collected at the same point should be two electroacoustic signals with the same sensitivity and phase, so that the external noise signals received by the front and back of the microphone are the same, and the effective voice signal of the front signal is much larger than that of the back signal, that is, two electroacoustic signals with the same position but different effective voice signal intensities can be obtained, the two electroacoustic signals are transmitted to the signal processing circuit by the double-differential input method, and the noise elimination processing is performed by the operational amplifier in the signal processing circuit, can effectually offset external noise, the noise reduction effect is obvious, promotes the anti-noise performance of product, and then promotes the pronunciation definition, and in addition, this microphone device realizes with low costsly, and the range of application is extensive, and the practicality is strong.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides a transmitter, its characterized in that includes first microphone, second microphone and circuit board, first microphone with the second microphone adopts the directional moving coil type microphone of the same heart type of structure, first microphone with the second microphone sets up back to back symmetry, be equipped with signal processing circuit on the circuit board, signal processing circuit includes operational amplifier at least, the electroacoustic signal that first microphone gathered passes through the wire and transmits to operational amplifier's inverting input end, the electroacoustic signal that second microphone gathered passes through the wire and transmits to operational amplifier's normal phase input end, operational amplifier's output connection signal leading-out terminal.
2. The microphone device according to claim 1, wherein the first microphone includes a first main body portion, and a first vibration system and a first magnetic circuit system provided in the first main body portion, the second microphone includes a second main body portion, and a second vibration system and a second magnetic circuit system provided in the second main body portion, the first main body portion and the second main body portion are assembled together, the first vibration system and the second vibration system are symmetrically provided centering on a joining position of the first main body portion and the second main body portion, and the first magnetic circuit system and the second magnetic circuit system are symmetrically provided centering on a joining position of the first main body portion and the second main body portion.
3. the microphone device as claimed in claim 1, further comprising a cover and a bottom, the cover and the bottom enclosing a first receiving cavity and a second receiving cavity, the first receiving cavity and the second receiving cavity communicating with each other, the first microphone and the second microphone being located in the first receiving cavity, and the circuit board being located in the second receiving cavity.
4. The microphone device as claimed in claim 3, wherein damping films are provided between the side of the case cover and the first microphone and between the side of the case cover and the second microphone.
5. The microphone device as defined by claim 3, wherein the first receiving chamber has a volume larger than that of the second receiving chamber.
6. The microphone device as claimed in claim 1, wherein the electric acoustic signal collected by the first microphone is transmitted to the inverting input terminal of the operational amplifier through two wires, the electric acoustic signal collected by the second microphone is transmitted to the non-inverting input terminal of the operational amplifier through two wires, and the output terminal of the operational amplifier is connected to the signal drawing terminal through two wires.
7. The microphone device as claimed in claim 1, wherein the operational amplifier is an LM6482 dual operational amplifier, and the operational amplifier specifically includes a first LM6482 operational amplifier and a second LM6482 operational amplifier, the electric acoustic signal collected by the first microphone is transmitted to the inverting input terminal of the first LM6482 operational amplifier through a wire, the electric acoustic signal collected by the second microphone is transmitted to the non-inverting input terminal of the first LM6482 operational amplifier through a wire, the output terminal of the first LM6482 operational amplifier is connected to the signal extraction terminal, and the non-inverting input terminal of the first LM6482 operational amplifier is connected to the output terminal of the second LM6482 operational amplifier.
8. The microphone apparatus as defined by claim 7 wherein the signal processing circuit further comprises a first differential circuit audio input capacitance connected between the first microphone and the inverting input of the first LM6482 operational amplifier and a second differential circuit audio input capacitance connected between the second microphone and the non-inverting input of the first LM6482 operational amplifier.
9. The microphone apparatus according to claim 8, wherein the signal processing circuit further includes a first differential circuit input resistance, a second differential circuit input resistance, a first feedback resistance, and a second feedback resistance, the first differential circuit input resistor is connected between the first differential circuit audio input capacitor and the inverting input of the first LM6482 operational amplifier, the second differential circuit input resistor is connected between the second differential circuit audio input capacitor and the non-inverting input of the first LM6482 operational amplifier, the first feedback resistor is respectively connected with the inverting input end of the first LM6482 operational amplifier and the output end of the first LM6482 operational amplifier, the second feedback resistor is respectively connected with the non-inverting input end of the first LM6482 operational amplifier and the output end of the second LM6482 operational amplifier.
10. the microphone apparatus according to claim 9, wherein the signal processing circuit further comprises a differential circuit audio output capacitor connected between the output terminal of the first LM6482 operational amplifier and the signal lead-out terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920873593.0U CN209806082U (en) | 2019-06-11 | 2019-06-11 | Telephone transmitter |
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| CN201920873593.0U CN209806082U (en) | 2019-06-11 | 2019-06-11 | Telephone transmitter |
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| CN209806082U true CN209806082U (en) | 2019-12-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110099342A (en) * | 2019-06-11 | 2019-08-06 | 江西联创电声有限公司 | Telephone transmitter |
| RU2793179C1 (en) * | 2020-01-17 | 2023-03-29 | Шэньчжэнь Шокз Ко., Лтд. | Microphone and electronic device with microphone |
| US11671746B2 (en) | 2020-01-17 | 2023-06-06 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
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2019
- 2019-06-11 CN CN201920873593.0U patent/CN209806082U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110099342A (en) * | 2019-06-11 | 2019-08-06 | 江西联创电声有限公司 | Telephone transmitter |
| CN110099342B (en) * | 2019-06-11 | 2024-01-05 | 江西联创电声有限公司 | Transmitter unit |
| RU2793179C1 (en) * | 2020-01-17 | 2023-03-29 | Шэньчжэнь Шокз Ко., Лтд. | Microphone and electronic device with microphone |
| US11671746B2 (en) | 2020-01-17 | 2023-06-06 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
| US12015894B2 (en) | 2020-01-17 | 2024-06-18 | Shenzhen Shokz Co., Ltd. | Microphone and electronic device having the same |
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