CN219834361U - Sound control circuit of conference microphone and conference system - Google Patents
Sound control circuit of conference microphone and conference system Download PDFInfo
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- CN219834361U CN219834361U CN202320895325.5U CN202320895325U CN219834361U CN 219834361 U CN219834361 U CN 219834361U CN 202320895325 U CN202320895325 U CN 202320895325U CN 219834361 U CN219834361 U CN 219834361U
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Abstract
The utility model discloses a sound control circuit of a conference microphone and a conference system, wherein the sound control circuit of the conference microphone comprises a pickup module, an operational amplification circuit, a signal conversion circuit, a detection chip, a relay control circuit and a relay, wherein the output end of the pickup module is connected with the input end of the operational amplification circuit, the first output end of the operational amplification circuit is connected with the first input end of the relay, the second output end of the operational amplification circuit is connected with the input end of the signal conversion circuit, the output end of the signal conversion circuit is connected with the first input end of the detection chip, the first output end of the detection chip is connected with the input end of the relay control circuit, and the output end of the relay control circuit is connected with the second input end of the relay. The utility model is used as a sound control circuit of the conference microphone and a conference system, and can be widely applied to the technical field of conference systems by detecting sound signals to control the state of the conference microphone.
Description
Technical Field
The utility model relates to the technical field of conference systems, in particular to a sound control circuit of a conference microphone and a conference system.
Background
With the development of society, conference systems are required in more occasions, and the existing conference microphones in the market are all controlled by turning on or off microphone sounds through touching keys by common entities. However, the common key is used as a key for controlling a microphone to be turned on and turned off after the microphone is turned on during a conference, and the microphone is usually forgotten to be turned off after the conference is finished, so that the conference system always has audio output, the power supply is wasted, the aging of electronic components is accelerated, and the using time of equipment is greatly shortened.
Disclosure of Invention
Therefore, the embodiment of the utility model provides a sound control circuit of a conference microphone and a conference system, wherein the sound control circuit is convenient to use and can control the state by detecting sound.
The embodiment of the utility model provides a sound control circuit of a conference microphone, which comprises a pickup module, an operational amplification circuit, a signal conversion circuit, a detection chip, a relay control circuit and a relay, wherein the output end of the pickup module is connected with the input end of the operational amplification circuit, the first output end of the operational amplification circuit is connected with the first input end of the relay, the second output end of the operational amplification circuit is connected with the input end of the signal conversion circuit, the output end of the signal conversion circuit is connected with the first input end of the detection chip, the first output end of the detection chip is connected with the input end of the relay control circuit, and the output end of the relay control circuit is connected with the second input end of the relay.
Optionally, the operational amplification circuit includes a first capacitor, a first resistor, a second capacitor, a second resistor, a first operational amplifier and a third capacitor, the input end of the first capacitor is connected with the pickup module, the output end of the first capacitor is connected with the input end of the first resistor, the output end of the first resistor is connected with the negative input end of the first operational amplifier, the positive input end of the first operational amplifier is connected with a first reference voltage, the output end of the first operational amplifier is respectively connected with the input end of the second capacitor, the input end of the second resistor and the input end of the third capacitor, the output end of the second capacitor is connected with the negative input end of the first operational amplifier, the output end of the second resistor is connected with the negative input end of the first operational amplifier, the first output end of the third capacitor is connected with the first input end of the relay, and the second output end of the third capacitor is connected with the input end of the signal conversion circuit.
Optionally, the signal conversion circuit includes a third resistor, a second operational amplifier, a fourth resistor, a fourth capacitor, a fifth resistor, a first diode, a second diode, a sixth capacitor, a sixth resistor, a seventh resistor and a voltage stabilizing diode, wherein an input end of the third resistor is connected to a second output end of the operational amplifier circuit, an output end of the third resistor is connected to a negative input end of the second operational amplifier, a positive input end of the second operational amplifier is connected to a second reference voltage, an output end of the second operational amplifier is respectively connected to an input end of the fourth resistor, an input end of the fourth capacitor and an input end of the fifth capacitor, an output end of the fourth resistor is connected to a negative input end of the second operational amplifier, an output end of the fifth capacitor is connected to an input end of the fifth resistor, an output end of the fifth resistor is respectively connected to an output end of the fifth diode, an output end of the fifth resistor is respectively connected to a positive end of the fourth resistor and a negative end of the sixth diode, an output end of the fourth resistor is respectively connected to a positive end of the fourth diode and a negative end of the fourth diode, and an output end of the fifth resistor is respectively connected to a positive end of the fourth diode is respectively.
Optionally, the relay control circuit includes eighth resistance, first triode, ninth resistance, second triode, tenth resistance, third diode and seventh electric capacity, the input of eighth resistance is connected the first output of detecting the chip, the output of eighth resistance is connected the base of first triode, first voltage is connected to the projecting pole of first triode, the collecting electrode of first triode is connected the input of ninth resistance, the output of ninth resistance is connected the base of second triode, the projecting pole of second triode is connected analog ground, the collecting electrode of second triode is connected the input of tenth resistance, the output of tenth resistance is connected the positive pole of third diode with the second input of relay respectively, the negative pole of third diode is connected the first output of relay respectively, the input of seventh electric capacity and second voltage, the output of seventh electric capacity is connected analog ground.
Optionally, the power supply input end of the pickup module is connected with the output end of the eighth capacitor and the output end of the eleventh resistor respectively, the input end of the eighth capacitor is connected with analog ground, and the input end of the eleventh resistor is connected with the third voltage.
Optionally, the second input end of the detection chip is connected to the input end of the ninth capacitor, the input end of the tenth capacitor, the input end of the eleventh capacitor, the input end of the twelfth capacitor, the input end of the thirteenth capacitor, the input end of the fourteenth capacitor and the fourth voltage, and the second output end of the detection chip is connected to the output end of the ninth capacitor, the output end of the tenth capacitor, the output end of the eleventh capacitor, the output end of the twelfth capacitor, the output end of the thirteenth capacitor, the output end of the fourteenth capacitor and the ground.
Optionally, the detection chip adopts an stm32 singlechip.
Optionally, the relay adopts a single pole double throw switch relay.
In another aspect, an embodiment of the present utility model further provides a conference system, including a sound control circuit of a conference microphone as described above.
The technical scheme in the embodiment of the utility model has the following advantages: the sound control circuit of the conference microphone comprises a pickup module, an operational amplification circuit, a signal conversion circuit, a detection chip, a relay control circuit and a relay, wherein the pickup module receives a sound signal, the sound signal is amplified by the operational amplification circuit and then is converted into an electric signal by the signal conversion circuit, the electric signal is detected according to the detection chip, a detection result is sent to the relay control circuit, the relay is controlled to be opened and closed by the relay control circuit, and the amplified sound signal is output when the relay is closed. The sound control circuit of the conference microphone can detect sound signals, control the state of the conference microphone, avoid unnecessary waste, and save energy and protect environment.
Drawings
Fig. 1 is a block diagram showing the overall structure of a sound control circuit of a conference microphone according to the present utility model;
fig. 2 is a schematic circuit diagram of a sound control circuit for a conference microphone according to the present utility model.
Detailed Description
The utility model is further explained and illustrated below with reference to the drawing and the specific embodiments of the present specification.
In the related art, the conference microphone is controlled by opening or closing microphone sound through a common entity touching a key, and in the conference process, the microphone is opened through the key, or the microphone is closed by manually operating the key of the conference unit, so that the conference is often forgotten to be closed after the conference is ended, audio output is always carried out, the power supply is wasted, the aging of electronic components is accelerated, and the service time of equipment is greatly shortened. Aiming at the defects that the microphone is forgotten to be manually closed after the conference is finished due to human factors, audio output is always available, the service life of equipment is shortened due to long-time power on, and the like, the utility model provides a sound control circuit which can automatically open and close the audio of the microphone, thereby avoiding the phenomenon that the microphone is forgotten to be closed due to human factors and avoiding the need of manually triggering the microphone to be opened or closed.
In one aspect, an embodiment of the present utility model provides a sound control circuit of a conference microphone, including a pickup module, an operational amplification circuit, a signal conversion circuit, a detection chip, a relay control circuit and a relay, where an output end of the pickup module is connected to an input end of the operational amplification circuit, a first output end of the operational amplification circuit is connected to a first input end of the relay, a second output end of the operational amplification circuit is connected to an input end of the signal conversion circuit, an output end of the signal conversion circuit is connected to a first input end of the detection chip, a first output end of the detection chip is connected to an input end of the relay control circuit, and an output end of the relay control circuit is connected to a second input end of the relay.
In an embodiment of the present utility model, referring to fig. 1, the present utility model provides a sound control circuit of a conference microphone, for controlling a state of the conference microphone according to a sound signal, so as to output the sound signal when the sound signal is detected; otherwise, the conference microphone is automatically closed without manual operation. The sound control circuit of the conference microphone of the embodiment comprises a pickup module, an operational amplification circuit, a signal conversion circuit, a detection chip, a relay control circuit and a relay, wherein the pickup module can be a sound collection device such as a microphone, a microphone core, a microphone and the like and is used for collecting sound signals; the operational amplification circuit is used for amplifying the sound signals acquired by the pickup module and transmitting the sound signals to the signal conversion circuit and the relay; the signal conversion circuit is used for converting the amplified sound signal into an electric signal; the detection chip is used for detecting the electric signal obtained by the conversion of the signal conversion circuit, judging the input of the sound signal, and sending a detection signal to the relay control circuit when the sound signal is detected to exist, so that the relay control circuit controls the relay to be closed and outputs the sound signal; when no sound signal exists in a certain time, a signal is sent to a relay control circuit, and the relay is controlled to be opened by the relay control circuit, so that the conference microphone is automatically closed. It is conceivable that the detection time in the present embodiment may be set according to the actual situation, for example, it is set that no sound signal is detected within five minutes, and the microphone is automatically turned off without manual operation. In addition, in the embodiment, the detection chip adopts an STM32 singlechip, the relay adopts a single-pole double-throw switch relay, and the components in the operational amplification circuit, the signal conversion circuit and the relay control circuit are all universal circuit components. In one possible implementation, the embodiment may also be compatible with a keyed conference microphone, and may set a key mode or a sound control mode. The energy-saving and environment-friendly energy-saving device has the advantages of saving electricity, avoiding unnecessary waste and conforming to the energy-saving and environment-friendly concept. The utility model can prolong the service time of the equipment and is more convenient and quicker to use.
Further as a preferred embodiment, the operational amplification circuit includes a first capacitor, a first resistor, a second capacitor, a second resistor, a first operational amplifier and a third capacitor, wherein the input end of the first capacitor is connected with the pickup module, the output end of the first capacitor is connected with the input end of the first resistor, the output end of the first resistor is connected with the negative input end of the first operational amplifier, the positive input end of the first operational amplifier is connected with a first reference voltage, the output end of the first operational amplifier is respectively connected with the input end of the second capacitor, the input end of the second resistor and the input end of the third capacitor, the output end of the second capacitor is connected with the negative input end of the first operational amplifier, the output end of the second resistor is connected with the negative input end of the first operational amplifier, the first output end of the third capacitor is connected with the first input end of the relay, and the second output end of the third capacitor is connected with the input end of the signal conversion circuit.
Referring to fig. 2, the operational amplifier circuit of the embodiment of the present utility model includes a first capacitor C10, a first resistor R19, a second capacitor C12, a second resistor R20, a first operational amplifier IC1B, and a third capacitor C100. The first capacitor C10 is used for connecting the pickup module P1 and the operational amplifier circuit for signal coupling, the first capacitor C10 is connected with the first resistor R19 and inputs the signal to the 6 th pin, namely the negative input end, of the first operational amplifier ICB1, the 5 th pin is a power pin, namely the positive input end is connected with the first reference voltage Verf-B, the second capacitor C12, the second resistor R20 is a feedback device of the first operational amplifier, the 7 th pin, namely the output end of the first operational amplifier performs amplifier audio output, and the first operational amplifier can use the NE5532 amplifier. The third capacitor C100 is a coupling capacitor that couples the amplified audio signal output from the first operational amplifier with the relay RE1 and the signal conversion circuit.
Further, as a preferred embodiment, the signal conversion circuit includes a third resistor, a second operational amplifier, a fourth resistor, a fourth capacitor, a fifth resistor, a first diode, a second diode, a sixth capacitor, a sixth resistor, a seventh resistor and a zener diode, wherein an input end of the third resistor is connected to a second output end of the operational amplifier, an output end of the third resistor is connected to a negative input end of the second operational amplifier, a positive input end of the second operational amplifier is connected to a second reference voltage, an output end of the second operational amplifier is connected to an input end of the fourth resistor, an input end of the fourth capacitor and an input end of the fifth capacitor are respectively connected, an output end of the fourth resistor is connected to a negative input end of the second operational amplifier, an output end of the fifth capacitor is connected to an input end of the fifth resistor, an output end of the fifth resistor is respectively connected to a negative input end of the second operational amplifier, an output end of the fifth resistor is respectively connected to a positive end of the sixth diode and a negative end of the sixth diode, an output end of the fourth resistor is respectively connected to a positive end of the fifth diode and a negative end of the fifth diode is respectively connected to a positive end of the sixth diode.
In an embodiment of the present utility model, referring to fig. 2, the signal conversion circuit includes a third resistor R77, a second operational amplifier IC3A, a fourth resistor R76, a fourth capacitor C58, a fifth capacitor C57, a fifth resistor R75, a first diode D3, a second diode D13, a sixth capacitor C56, a sixth resistor R74, a seventh resistor R73, and a zener diode D4. The third resistor R77 is connected to the fourth resistor R76, the fourth capacitor C58, and the 2 nd pin of the second operational amplifier IC3A, that is, the negative input end of the second operational amplifier, the positive input end of the second operational amplifier is connected to the second reference voltage Verf-D, the feedback amplification is performed through the fourth resistor R76 and the fourth capacitor C58, the 1 st pin output of the second operational amplifier, that is, the output end is connected to the fifth capacitor C57, the fifth resistor R75, the output end is connected to the first diode D3 and the second diode D13, the output end is connected to the analog ground AGND, the rectification is performed to the direct voltage, the output is output to the sixth capacitor C56, the sixth resistor R74, the seventh resistor R73 performs filtering and impedance matching, and the one end of the sixth resistor R74 is connected to the analog ground AGND. And finally, voltage stabilization is carried out through a 3.3V voltage stabilizing diode D4, so that the detection chip is prevented from being burnt. The first diode and the second diode may employ IN4148 diodes.
Further as a preferred embodiment, the relay control circuit includes an eighth resistor, a first triode, a ninth resistor, a second triode, a tenth resistor, a third diode and a seventh capacitor, wherein an input end of the eighth resistor is connected with a first output end of the detection chip, an output end of the eighth resistor is connected with a base electrode of the first triode, an emitter electrode of the first triode is connected with a first voltage, a collector electrode of the first triode is connected with an input end of the ninth resistor, an output end of the ninth resistor is connected with a base electrode of the second triode, an emitter electrode of the second triode is connected with an analog ground, a collector electrode of the second triode is connected with an input end of the tenth resistor, an output end of the tenth resistor is respectively connected with an anode of the third diode and a second input end of the relay, a cathode of the third diode is respectively connected with a first output end of the relay, an input end of the seventh capacitor and a second voltage, and an output end of the seventh capacitor is connected with an analog ground.
In the embodiment of the utility model, the relay control circuit comprises an eighth resistor R35, a first triode Q6, a ninth resistor R34, a second triode Q5, a tenth resistor R33, a third diode D7 and a seventh capacitor C23, wherein the eighth resistor R35 is connected with the base electrode of the first triode Q6, the emitter electrode of the first triode Q6 is connected with a first voltage of 3.3V, the collector electrode of the first triode Q6 is connected with the ninth resistor R34, the ninth resistor R34 is connected with the base electrode of the second triode Q5, the emitter electrode of the second triode Q5 is connected with an analog ground AGND, the collector electrode of the second triode Q5 is connected with the tenth resistor R33, and the tenth resistor R33 is used for limiting current to be overlarge so as to avoid burning out the relay RE1. The tenth resistor R33 is also connected to the positive electrode of the third diode D7, and functions as a protection relay RE1 through the third diode D7, the negative electrode of the third diode D7 is connected to the second voltage of 5V and one end of the seventh capacitor C23, and the other end of the seventh capacitor C23 is connected to the analog ground AGND. The relay RE1 corresponds to a switch, and its state is controlled by pin 38 of the detection chip U14. The eighth resistor R35 is connected to the 38 th pin of the detection chip U14, when the 38 th pin is set to be at a low level, the first triode Q6 is conducted, the collector of the second triode Q5 is always at a high level, the base of the second triode Q5 is connected with the ninth resistor R34, when the base is at a low level, the second triode Q5 is conducted, the relay RE1 is closed, and the audio frequency is normally output. When the 38 th pin is set to a high level, the first triode Q6 is in an off state, no current passes, the second triode Q5 is in an off state, the relay RE1 is always in an off state, and no audio output exists.
Further as a preferred embodiment, the power supply input end of the sound pickup module is connected to the output end of the eighth capacitor and the output end of the eleventh resistor, respectively, the input end of the eighth capacitor is connected to analog ground, and the input end of the eleventh resistor is connected to the third voltage.
In the embodiment of the present utility model, referring to fig. 2, the power supply input end of the pickup module is connected to the output end of the eighth capacitor C1 and the output end of the eleventh resistor R1, respectively, the input end of the eighth capacitor C1 is connected to the analog ground AGND, and the input end of the eleventh resistor R1 is connected to the third voltage of 5V.
Further as a preferred embodiment, the second input end of the detection chip is connected to the input end of the ninth capacitor, the input end of the tenth capacitor, the input end of the eleventh capacitor, the input end of the twelfth capacitor, the input end of the thirteenth capacitor, the input end of the fourteenth capacitor and the fourth voltage, and the second output end of the detection chip is connected to the output end of the ninth capacitor, the output end of the tenth capacitor, the output end of the eleventh capacitor, the output end of the twelfth capacitor, the output end of the thirteenth capacitor, the output end of the fourteenth capacitor and the ground, respectively.
In the embodiment of the present utility model, referring to fig. 2, pins 1, 13, 19, 32, 48, and 64 of the detection chip U14 are connected to a fourth voltage, i.e., positive power +3.3v; pins 12, 18, 31, 47, 63 are connected to the ground, and a ninth capacitor C29, a tenth capacitor C30, an eleventh capacitor C31, a twelfth capacitor C49, a thirteenth capacitor C50, and a fourteenth capacitor C51 are used for decoupling and filtering. Pins 29 and 30 of the detection chip U14 can also be connected with a conference host, and key control and other operations can be performed through the conference host.
Further as a preferred embodiment, the detection chip adopts stm32 singlechip.
Further as a preferred embodiment, the relay is a single pole double throw switching relay.
In another aspect, an embodiment of the present utility model further provides a conference system, including a sound control circuit of a conference microphone as described above.
The working principle of the sound control circuit of the conference microphone of the embodiment of the utility model is that: the voice signal of the human voice speaking is collected by the pickup module, the signal amplification is carried out through the operational amplification circuit, the voice signal is changed into a level signal through the rectifying tube in the signal conversion circuit and is transmitted to the detection chip MCU (STM 32 FXX) for detection, the detection chip can judge whether the microphone has audio input or not, the magnitude of the level signal is controlled to open or close the relay through the relay control circuit, and accordingly the audio of the microphone is controlled to be opened or the audio source output is controlled to be closed. And simultaneously, the conference microphone can be communicated with the host computer, and whether the conference microphone uses a sound control mode or a keying mode or the like is set.
In summary, compared with the prior art, the utility model has the following advantages: the embodiment of the utility model can enable the audio of the microphone to be automatically started and closed by utilizing the sound control circuit, thereby reducing the occurrence of forgetting to close the microphone due to human factors and avoiding the need of manually triggering to start or close the microphone.
While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are intended to be included in the scope of the present utility model as defined in the appended claims.
Claims (9)
1. A sound control circuit for a conference microphone, characterized by: including pickup module, operational amplification circuit, signal conversion circuit, detection chip, relay control circuit and relay, wherein, the output of pickup module is connected operational amplification circuit's input, operational amplification circuit's first output is connected the first input of relay, operational amplification circuit's second output is connected signal conversion circuit's input, signal conversion circuit's output is connected detection chip's first input, detection chip's first output is connected relay control circuit's input, relay control circuit's output is connected the second input of relay.
2. A sound control circuit for a conference microphone according to claim 1, wherein: the operational amplification circuit comprises a first capacitor, a first resistor, a second capacitor, a second resistor, a first operational amplifier and a third capacitor, wherein the input end of the first capacitor is connected with the pickup module, the output end of the first capacitor is connected with the input end of the first resistor, the output end of the first resistor is connected with the negative input end of the first operational amplifier, the positive input end of the first operational amplifier is connected with a first reference voltage, the output end of the first operational amplifier is respectively connected with the input end of the second capacitor, the input end of the second resistor and the input end of the third capacitor, the output end of the second capacitor is connected with the negative input end of the first operational amplifier, the output end of the second resistor is connected with the negative input end of the first operational amplifier, the first output end of the third capacitor is connected with the first input end of the relay, and the second output end of the third capacitor is connected with the input end of the signal conversion circuit.
3. A sound control circuit for a conference microphone according to claim 1, wherein: the signal conversion circuit comprises a third resistor, a second operational amplifier, a fourth resistor, a fourth capacitor, a fifth resistor, a first diode, a second diode, a sixth capacitor, a sixth resistor, a seventh resistor and a voltage stabilizing diode, wherein the input end of the third resistor is connected with the second output end of the operational amplifier circuit, the output end of the third resistor is connected with the negative input end of the second operational amplifier, the positive input end of the second operational amplifier is connected with a second reference voltage, the output end of the second operational amplifier is respectively connected with the input end of the fourth resistor, the input end of the fourth capacitor and the input end of the fifth capacitor, the output end of the fourth resistor is connected with the negative input end of the second operational amplifier, the output end of the fifth capacitor is connected with the input end of the fifth resistor, the output end of the fifth resistor is respectively connected with the positive end of the second diode and the negative end of the fourth resistor, the positive end of the fifth resistor is respectively connected with the positive end of the seventh diode and the negative end of the fourth resistor, the positive end of the fourth resistor is respectively connected with the positive end of the fifth diode and the negative end of the fourth resistor, the fourth resistor is respectively connected with the positive end of the fourth diode and the negative end of the fourth diode.
4. A sound control circuit for a conference microphone according to claim 1, wherein: the relay control circuit comprises an eighth resistor, a first triode, a ninth resistor, a second triode, a tenth resistor, a third diode and a seventh capacitor, wherein the input end of the eighth resistor is connected with the first output end of the detection chip, the output end of the eighth resistor is connected with the base electrode of the first triode, the emitting electrode of the first triode is connected with a first voltage, the collecting electrode of the first triode is connected with the input end of the ninth resistor, the output end of the ninth resistor is connected with the base electrode of the second triode, the emitting electrode of the second triode is connected with an analog ground, the collecting electrode of the second triode is connected with the input end of the tenth resistor, the output end of the tenth resistor is respectively connected with the positive electrode of the third diode and the second input end of the relay, the negative electrode of the third diode is respectively connected with the first output end of the relay, the input end of the seventh capacitor and the second voltage, and the output end of the seventh capacitor is connected with the analog ground.
5. A sound control circuit for a conference microphone according to claim 1, wherein: the power supply input end of the pickup module is respectively connected with the output end of the eighth capacitor and the output end of the eleventh resistor, the input end of the eighth capacitor is connected with the analog ground, and the input end of the eleventh resistor is connected with the third voltage.
6. A sound control circuit for a conference microphone according to claim 1, wherein: the second input end of the detection chip is respectively connected with the input end of the ninth capacitor, the input end of the tenth capacitor, the input end of the eleventh capacitor, the input end of the twelfth capacitor, the input end of the thirteenth capacitor, the input end of the fourteenth capacitor and the fourth voltage, and the second output end of the detection chip is respectively connected with the output end of the ninth capacitor, the output end of the tenth capacitor, the output end of the eleventh capacitor, the output end of the twelfth capacitor, the output end of the thirteenth capacitor, the output end of the fourteenth capacitor and the ground.
7. A sound control circuit for a conference microphone according to claim 1, wherein: the detection chip adopts stm32 singlechip.
8. A sound control circuit for a conference microphone according to claim 1, wherein: the relay adopts a single-pole double-throw switch relay.
9. A conference system comprising a sound control circuit of a conference microphone according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320895325.5U CN219834361U (en) | 2023-04-19 | 2023-04-19 | Sound control circuit of conference microphone and conference system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320895325.5U CN219834361U (en) | 2023-04-19 | 2023-04-19 | Sound control circuit of conference microphone and conference system |
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| Publication Number | Publication Date |
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| CN219834361U true CN219834361U (en) | 2023-10-13 |
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| CN202320895325.5U Active CN219834361U (en) | 2023-04-19 | 2023-04-19 | Sound control circuit of conference microphone and conference system |
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| CN (1) | CN219834361U (en) |
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- 2023-04-19 CN CN202320895325.5U patent/CN219834361U/en active Active
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