CN217011196U - Microphone detection circuit for video conference - Google Patents
Microphone detection circuit for video conference Download PDFInfo
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- CN217011196U CN217011196U CN202220611129.6U CN202220611129U CN217011196U CN 217011196 U CN217011196 U CN 217011196U CN 202220611129 U CN202220611129 U CN 202220611129U CN 217011196 U CN217011196 U CN 217011196U
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Abstract
The utility model provides a microphone detection circuit for a video conference, which effectively solves the problem that the noise processing in a microphone simultaneously causes the disappearance of partial speaker sounds in the prior art. The detection circuit comprises a noise detection circuit and a noise elimination circuit, wherein the noise detection circuit detects a sound signal by using a microphone M1, obtains a noise signal after the sound signal is operated and filtered, outputs the noise signal and the sound signal to the noise elimination circuit, processes the sound signal after the noise signal is judged by the noise elimination circuit, and outputs the sound signal to a frequency modulator, so that a video conference is not influenced by noise.
Description
Technical Field
The utility model relates to the field of video conferences, in particular to a microphone detection circuit for a video conference.
Background
Video conferencing refers to a meeting in which people at two or more addresses have a face-to-face conversation via a communication device and a network. Video conferences can be divided into point-to-point conferences and multipoint conferences according to different numbers of participating addresses. The daily individuals have no requirements on the safety of speaking contents, the quality of conferences and the planning of conferences, and can select video software such as Tencent QQ to carry out video conversation. And the commercial video conference of government organs and enterprise institutions requires conditions such as a stable and safe network, firm conference quality, formal conference environment and the like, and professional video conference equipment needs to be applied to form a special video conference system.
In the actual use process of the video conference, a conventional method is that the microphone is adopted to convert the sound emitted by people into an electric signal, the electric signal is adjusted to a proper frequency through a frequency modulator in the microphone and then played, but in the conference process, a common microphone does not have special noise processing, so that noise is picked up, the noise comprises the sound of moving of an air conditioner, a fan, a chair and the like, the noise is found to have obvious influence on the quality of the video conference, so that participants cannot clearly hear the speech of a speaker, a part of microphones add a filter to process the noise, and the filter processes the noise and the sound of the speaker, so that the phenomenon that the sound of a part of speakers disappears is caused.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a microphone detection circuit for a video conference, which effectively solves the problem that the noise processing in a microphone simultaneously causes the disappearance of the sound of part of speakers in the prior art.
The technical scheme includes that the microphone detection circuit for the video conference comprises a noise detection circuit and a noise elimination circuit, the noise detection circuit detects a sound signal by using a microphone M1, the sound signal is subjected to operation and filtering to obtain a noise signal, the noise signal and the sound signal are output to the noise elimination circuit, the noise elimination circuit judges the noise signal, processes the sound signal, and outputs the sound signal to a frequency modulator.
Further, the noise detection circuit detects a sound signal by using the microphone M1, multiplies and filters the sound signal to obtain a noise signal, and outputs the noise signal and the sound signal to the noise cancellation circuit.
Furthermore, the noise detection circuit comprises a resistor R1, one end of the resistor R1 is connected to one end of a resistor R2, the anode of a diode D3 and one end of a microphone M1, the other end of the resistor R1 is connected to one end of the resistor R4 and a positive power supply VCC, the cathode of the diode D3 is connected to one end of a bidirectional voltage regulator D1 and a pin 1 of a multiplier V1, a pin 2 of the multiplier V1 is connected to the other end of a resistor R4, the output end of the multiplier V1 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the same-phase end of the operational amplifier U2B, the inverting end of the operational amplifier U2B is connected to one end of the resistor R7, the output end of the operational amplifier U2B, one end of a resistor R7, the other end of the resistor R7 is connected with one end of a capacitor C6, the other end of the capacitor C6 is connected with the other end of a bidirectional voltage regulator D1, the other end of the resistor R2 and the other end of the microphone M1 in parallel connection and connected with the ground.
Further, the noise elimination circuit judges the amplitude of the noise signal, processes the sound signal according to the amplitude of the noise signal, and outputs the processed sound signal to the frequency modulator.
Further, the noise cancellation circuit includes a resistor R3, one end of the resistor R3 is connected to the base of the transistor Q1 and the anode of the diode D4, the cathode of the diode D4 is connected to the 2 pin of the multiplier V2, the 1 pin of the multiplier V2 is connected to the anode of the thyristor Q2 and the 1 pin of the multiplier V1, the output end of the multiplier V2 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the capacitor C3, one end of the resistor R11 and the base of the transistor Q3, the collector of the transistor Q3 is connected to the other end of the resistor R11, the other end of the resistor R3, the emitter of the transistor Q1 and the other end of the resistor R1 in the noise detection circuit and is connected to the positive power VCC, the emitter of the transistor Q3 is connected to one end of the resistor R16 and one end of the capacitor C2, and the other end of the capacitor C2 is connected to one end of the frequency modulator, one end of the resistor R10 and the output end of the operational amplifier U1B, the non-inverting end of the operational amplifier U1B is connected to one end of a resistor R6, the inverting end of the operational amplifier U1B is connected to one end of a resistor R8 and the other end of a resistor R10 respectively, the other end of the resistor R6 is connected to the cathode of a thyristor Q2, the control electrode of the thyristor Q2 is connected to the cathode of a diode D2 and one end of a capacitor C1 respectively, the anode of the diode D2 is connected to the collector of a triode Q1 and one end of a resistor R9 respectively, the other end of the resistor R9 is connected to the other end of a capacitor C1, the other end of the resistor R8, the other end of the resistor R16 and the other end of a capacitor C6 in the noise detection circuit respectively and connected to ground in parallel.
The utility model realizes the following beneficial effects:
the noise detection circuit is arranged to detect collected sound signals in the microphone, the multiplier V1, the resistor R7 and the capacitor C6 are used for multiplying and filtering the noise signals respectively, whether the noise signals exist in the sound signals is detected, the triode Q1 and the diode D4 in the noise elimination circuit are used for judging the noise signals, the multiplier V2, the resistor R12 and the capacitor C3 are used for processing the noise in the sound signals, the purpose of eliminating the noise is achieved, the experience of other participants is guaranteed, and the phenomenon that partial voices disappear when the noise in the microphone is processed in the prior art is avoided.
Drawings
Fig. 1 is a schematic diagram of a noise detection circuit of the present invention.
Fig. 2 is a schematic diagram of a noise canceling circuit of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the utility model will be apparent from the following more particular description of the embodiments, as illustrated in the accompanying drawings in which reference is made to figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A microphone detection circuit for a video conference is applied to a microphone and comprises a noise detection circuit and a noise elimination circuit, wherein the noise detection circuit detects a sound signal by using a microphone M1, the sound signal is subjected to operation and filtering to obtain a noise signal, the noise signal and the sound signal are output to the noise elimination circuit, the noise elimination circuit judges the noise signal, processes the sound signal and outputs the sound signal to a frequency modulator.
The noise detection circuit detects a voice signal of a speaker by using a microphone M1, and transmits the voice signal to a multiplier V1 through a diode D3 to be multiplied by a standard voice signal provided by a resistor R4, wherein the standard voice signal provided by a resistor R4 is a noiseless voice signal, the multiplier V1 outputs a first multiplication signal, the first multiplication signal is a frequency difference and a frequency sum of the voice signal and the standard voice signal, the operational amplifier U2B follows the multiplication signal and outputs the multiplication signal to a low-pass filter composed of a resistor R7 and a capacitor C6, only the frequency difference between the voice signal and the standard voice signal is allowed to exist, the frequency sum is filtered, the frequency difference is a noise signal, and the noise signal and the voice signal are output to a noise elimination circuit, the noise detection circuit comprises a resistor R1, and one end of the resistor R1 is respectively connected with one end of a resistor R2, The positive pole of a diode D3, one end of a microphone M1, the other end of a resistor R1 is respectively connected with one end of a resistor R4 and a positive power supply VCC, the negative pole of a diode D3 is respectively connected with one end of a bidirectional voltage regulator tube D1 and a pin 1 of a multiplier V1, a pin 2 of the multiplier V1 is connected with the other end of the resistor R4, the output end of the multiplier V1 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with the same-phase end of an operational amplifier U2B, the inverting end of the operational amplifier U2B is respectively connected with one end of a resistor R7, the output end of the operational amplifier U2B and one end of a resistor R7, the other end of the resistor R7 is connected with one end of a capacitor C6, and the other end of a capacitor C6 is respectively connected with the other end of a bidirectional voltage regulator tube D1, the other end of a resistor R2 and the other end of a microphone M1 and connected in parallel to the ground.
The noise elimination circuit judges a noise signal output by the noise detection circuit by using a triode Q1 and a diode D4, when the triode Q1 is conducted by the noise signal, the noise is not influenced by the sound signal, at the moment, the triode Q1 conducts a thyristor Q2 through a capacitor C1 and a diode D2, the thyristor Q2 transmits the sound signal to an operational amplifier U1B through a resistor R6, the operational amplifier U1B amplifies the sound signal to avoid that the amplitude of the sound signal is weak and influence the participation experience of other participants, the amplified sound signal is transmitted to a frequency modulator, the frequency modulator is used for processing the sound signal, when the diode D4 is conducted by the noise signal, the noise at the moment is shown to influence the sound signal and influence the participation experience of other participants, at the moment, the noise signal and the sound signal transmitted by the noise detection circuit are multiplied by a multiplier V2, the multiplier V2 outputs a second multiplication signal, where the second multiplication signal is composed of a frequency difference and a frequency sum of the sound signal and the noise signal, the resistor R12 and the capacitor C3 are used to filter the frequency sum in the second multiplication signal, only the existence of the frequency difference is reserved, the frequency difference at this time is the sound signal without the existence of noise, that is, the purpose of eliminating the noise is achieved, the sound signal after the noise elimination is output to the frequency modulator through the triode Q3, the sound signal is processed by the frequency modulator, the noise elimination circuit includes a resistor R3, one end of the resistor R3 is respectively connected to the base of the triode Q1 and the anode of the diode D4, the cathode of the diode D4 is connected to the 2 pin of the multiplier V2, the 1 pin of the multiplier V2 is respectively connected to the anode of the thyristor Q2 and the 1 pin of the multiplier V1, the output end of the multiplier V2 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of a capacitor C3, one end of a resistor R11 and the base of a triode Q3, the collector of the triode Q3 is connected to the other end of a resistor R11, the other end of the resistor R3, the emitter of the triode Q1 and the other end of the resistor R1 in the noise detection circuit and is connected to a positive power supply VCC, the emitter of the triode Q3 is connected to one end of a resistor R16 and one end of a capacitor C2, the other end of the capacitor C2 is connected to a frequency modulator, one end of the resistor R10 and the output end of an operational amplifier U1B, the non-inverting end of the operational amplifier U1B is connected to one end of the resistor R6, the inverting end of the operational amplifier U1B is connected to one end of a resistor R8 and the other end of the resistor R10, the other end of the resistor R6 is connected to the cathode of a thyristor Q539Q 2, the control electrode of the thyristor Q2 is connected to the cathode of a diode D2 and one end of the capacitor C1, the anode of a diode D2 is connected to the cathode of the collector of the diode D1, One end of the resistor R9 and the other end of the resistor R9 are connected to the other end of the capacitor C1, the other end of the resistor R8, the other end of the resistor R16, and the other end of the capacitor C6 in the noise detection circuit, respectively, and are connected to ground.
When the utility model is used, the noise detection circuit detects the voice signal of a speaker by using a microphone M1, and transmits the voice signal to a multiplier V1 through a diode D3 to be multiplied with the standard voice signal provided by a resistor R4, the multiplier V1 outputs a first multiplication signal, an operational amplifier U2B follows the multiplication signal and outputs the multiplication signal to a low-pass filter consisting of the resistor R7 and a capacitor C6, only the noise signal is allowed to exist and the noise signal and the voice signal are output to a noise elimination circuit, the noise elimination circuit judges the noise signal output by the noise detection circuit by using a triode Q1 and a diode D4, when the triode Q1 is conducted by the noise signal, the noise is not affected, at the moment, the triode Q1 conducts a thyristor Q2 through the capacitor C1 and the diode D2, the thyristor Q2 transmits the voice signal to the operational amplifier U1B through the resistor R6, the sound signal is amplified by the operational amplifier U1B, the amplitude of the sound signal is prevented from being weak, the participating experience of other participating personnel is prevented from being influenced, the amplified sound signal is transmitted to the frequency modulator, the frequency modulator is used for processing the sound signal, when the diode D4 is conducted by a noise signal, the noise at the moment is shown to have influence on the sound signal, the participating experience of other participating personnel is influenced, the multiplier V2 is used for multiplying the sound signal transmitted by the noise signal and the noise detection circuit at the moment, the multiplier V2 outputs a second multiplication signal, wherein the second multiplication signal is formed by the frequency difference and the frequency sum of the sound signal and the noise signal, the resistor R12 and the capacitor C3 are used for filtering the frequency sum in the second multiplication signal, only the existence of the sound signal is reserved, the purpose of noise elimination is realized, the sound signal after the noise elimination is output to the frequency modulator through the triode Q3, and processing the sound signal by using a frequency modulator.
The utility model realizes the following beneficial effects:
(1) the method comprises the steps that a noise detection circuit is arranged for detecting collected sound signals in a microphone, multiplication operation and filtering are respectively carried out on the noise signals by a multiplier V1, a resistor R7 and a capacitor C6, whether the noise signals exist in the sound signals is detected, the noise signals are judged by a triode Q1 and a diode D4 in a noise elimination circuit, and the noise in the sound signals is processed by the multiplier V2, the resistor R12 and the capacitor C3, so that the purpose of eliminating the noise is achieved, the experience of other participants is further guaranteed, and the phenomenon that partial voices disappear when the noise in the microphone is processed in the prior art is avoided;
(2) of the noise signal is judged through the noise elimination circuit, under the condition that the noise can not affect the sound signal, the noise signal is amplified by the operational amplifier U1B, namely, the situation that the amplitude of the sound signal of the speaker is weak, the participation experience of other participants is affected is avoided, and under the condition that the noise can affect the sound signal, the noise in the sound signal is eliminated by the multiplier V2, the resistor R12 and the capacitor C3, so that the video conference can not be affected by the noise, and the normal operation of the video conference is ensured.
Claims (5)
1. A microphone detection circuit for a video conference is characterized by comprising a noise detection circuit and a noise elimination circuit, wherein the noise detection circuit detects a sound signal by using a microphone M1, the sound signal is subjected to operation and filtering to obtain a noise signal, the noise signal and the sound signal are output to the noise elimination circuit, the noise elimination circuit judges the noise signal, processes the sound signal and outputs the sound signal to a frequency modulator.
2. The microphone detection circuit for video conferencing as claimed in claim 1, wherein the noise detection circuit detects the sound signal by using a microphone M1, multiplies and filters the sound signal to obtain a noise signal, and outputs the noise signal and the sound signal to the noise cancellation circuit.
3. The microphone detection circuit for the video conference as claimed in claim 2, wherein the noise detection circuit comprises a resistor R1, one end of the resistor R1 is connected to one end of a resistor R2, the anode of a diode D3 and one end of a microphone M1, the other end of the resistor R1 is connected to one end of the resistor R4 and the positive power VCC, the cathode of the diode D3 is connected to one end of a bidirectional regulator D1 and the 1 pin of a multiplier V1, the 2 pin of the multiplier V1 is connected to the other end of the resistor R4, the output end of the multiplier V1 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the non-inverting end of an operational amplifier U2B, the inverting end of the operational amplifier U2B is connected to one end of a resistor R7, the output end of the operational amplifier U2B and one end of a resistor R7, the other end of the resistor R7 is connected to one end of a capacitor C6, and the other end of the capacitor C6 is connected to one end of the bidirectional regulator D1, The other end of the resistor R2 and the other end of the microphone M1 are connected in parallel to ground.
4. The microphone detection circuit for video conferencing as claimed in claim 1, wherein the noise cancellation circuit determines the magnitude of the noise signal, processes the sound signal according to the magnitude of the noise signal, and outputs the processed sound signal to the frequency modulator.
5. The microphone detection circuit for the video conference as claimed in claim 4, wherein the noise cancellation circuit comprises a resistor R3, one end of the resistor R3 is connected to the base of the transistor Q1 and the anode of the diode D4 respectively, the cathode of the diode D4 is connected to the 2-pin of the multiplier V2, the 1-pin of the multiplier V2 is connected to the anode of the thyristor Q2 and the 1-pin of the multiplier V1 respectively, the output end of the multiplier V2 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to one end of the capacitor C3, one end of the resistor R11 and the base of the transistor Q3 respectively, the collector of the transistor Q3 is connected to the other end of the resistor R11, the other end of the resistor R3, the emitter of the transistor Q1, the other end of the positive polarity resistor R1 in the noise detection circuit is connected to the power supply VCC, the emitter of the transistor Q3 is connected to one end of the resistor R16 and one end of the capacitor C2 respectively, the other end of the capacitor C2 is connected to the frequency modulator, one end of the resistor R10, and the output end of the operational amplifier U1B, the in-phase end of the operational amplifier U1B is connected to one end of the resistor R6, the inverting end of the operational amplifier U1B is connected to one end of the resistor R8 and the other end of the resistor R10, the other end of the resistor R6 is connected to the cathode of the thyristor Q2, the control electrode of the thyristor Q2 is connected to the cathode of the diode D2 and one end of the capacitor C1, the anode of the diode D2 is connected to the collector of the transistor Q1 and one end of the resistor R9, and the other end of the resistor R9 is connected to the other end of the capacitor C1, the other end of the resistor R8, the other end of the resistor R16, and the other end of the capacitor C6 in the noise detection circuit, which are connected in parallel to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220611129.6U CN217011196U (en) | 2022-03-21 | 2022-03-21 | Microphone detection circuit for video conference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220611129.6U CN217011196U (en) | 2022-03-21 | 2022-03-21 | Microphone detection circuit for video conference |
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| Publication Number | Publication Date |
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| CN217011196U true CN217011196U (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220611129.6U Active CN217011196U (en) | 2022-03-21 | 2022-03-21 | Microphone detection circuit for video conference |
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| CN (1) | CN217011196U (en) |
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- 2022-03-21 CN CN202220611129.6U patent/CN217011196U/en active Active
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