A communication system of multiple wireless microphones and a receiver and its control method

Abstract

A communication system and its control method for multiple wireless microphones and a receiver. When the receiver receives an application signal sent by any wireless microphone, it sends connection frequency point information to the wireless microphone, enabling the wireless microphone to adjust and record the frequency of the audio transmission antenna, and forming a transmission channel for audio signals between the audio transmission antenna and the audio reception antenna at the same frequency, thereby realizing one-to-one simplex wireless data communication between the wireless microphone and the receiver and making the wireless microphone transition from the idle state to the used state. By setting multiple audio reception antennas that receive signals at different frequencies, multiple transmission channels can be formed, avoiding the problem of interference between signals when multiple wireless microphones communicate with the receiver wirelessly respectively. Moreover, through the receiver sequentially matching with multiple wireless microphones using the above control method, wireless data communication between a single receiver and multiple wireless microphones is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless microphone communication, and in particular to a communication system and a control method thereof for multiple wireless microphones and a receiver. Background Art

[0002] Generally, the wired audio and control signals of the currently used daisy-chain microphones are transmitted through the same line. Multiple wireless microphones form a daisy-chain reception by connecting to a receiver with two or four microphones. If more than four wireless microphones need to form a daisy-chain reception, additional receivers and external modules need to be connected in series.

[0003] The existing problem is that the more wireless microphones there are, the more intermodulation interference harmonics will be generated. When using more wireless microphones to form a daisy-chain reception, multiple receivers and external modules need to be connected in series. Each receiver is connected to two or four wireless microphones to reduce the intermodulation interference harmonics on a single receiver. In the actual use, to avoid interference, professional personnel need to manually change the frequency of the wireless microphones in use, so that each wireless microphone is assigned to a suitable non-interference frequency. The operation process is complex and time-consuming. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a communication system and a control method thereof for multiple wireless microphones and a receiver, so as to realize wireless data communication between a single receiver and multiple wireless microphones.

[0005] To achieve the above object, the solution provided by the present invention is a communication system for multiple wireless microphones and a receiver, including a receiver and multiple wireless microphones; the receiver includes a receiver CPU, a fixed-frequency receiving antenna, multiple audio receiving antennas, and a modulation transmitting module. Among them, the fixed-frequency receiving antenna, the audio receiving antenna, and the modulation transmitting module are respectively electrically connected to the receiver CPU; the receiver CPU pre-stores information on multiple connection frequency points; the modulation transmitting module is used to receive the connection frequency point information transmitted by the receiver CPU and modulate the connection frequency point information; the multiple audio receiving antennas are used to receive audio signals at different frequency points respectively; each wireless microphone includes a microphone CPU, a fixed-frequency transmitting antenna, a demodulation receiving module, and an audio transmitting antenna. Among them, the fixed-frequency transmitting antenna, the demodulation receiving module, and the audio transmitting antenna are respectively electrically connected to the microphone CPU; the fixed-frequency receiving antenna is used to receive the application signal at a predetermined frequency sent by the fixed-frequency transmitting antenna and transmit the application signal to the receiver CPU; the demodulation receiving module is used to receive and demodulate the connection frequency point information sent by the modulation transmitting module; the microphone CPU is used to save and process the connection frequency point information demodulated by the demodulation receiving module and adjust the frequency point of the audio transmitting antenna according to the connection frequency point information, so that the audio transmitting antenna sends an audio signal to the audio receiving antenna at the same frequency point.

[0006] Further, the wireless microphone further includes an audio acquisition module, and the audio transmitting antenna is electrically connected to the audio acquisition module. Among them, the audio acquisition module is used to acquire the sound emitted by the user to the wireless microphone and convert the sound into an audio signal and transmit it to the audio transmitting antenna.

[0007] Further, the wireless microphone further includes a microphone control key module, and the microphone control key module is electrically connected to the microphone CPU. Among them, the microphone control key module is used to control the fixed-frequency transmitting antenna to send an application signal.

[0008] Further, the receiver further includes a receiver control key module, and the receiver control key module is electrically connected to the receiver CPU. Among them, the receiver control key module is used to control the receiver CPU to transmit the connection frequency point information to the modulation transmitting module or control the receiver CPU not to transmit the connection frequency point information when the receiver CPU receives an application signal.

[0009] A control method for a communication system of multiple wireless microphones and a receiver includes the following steps:

[0010] Step S1, multiple wireless microphones in the idle state sequentially send application signals at a predetermined frequency to the fixed-frequency receiving antenna of the receiver through the fixed-frequency transmitting antenna to apply for connection with the receiver; the receiver and the wireless microphones in the idle state that send the application signals sequentially execute Step S2 to Step S6;

[0011] Step S2, the fixed-frequency receiving antenna of the receiver receives the application signal at a predetermined frequency. Then, the fixed-frequency receiving antenna conveys the application signal to the receiver CPU, and the receiver CPU then transmits connection frequency information or does not transmit connection frequency information to the modulation and transmission module according to user requirements; if the receiver CPU transmits connection frequency information to the modulation and transmission module, then execute Step S3; if the receiver CPU does not transmit connection frequency information, then execute Step S1;

[0012] Step S3, the modulation and transmission module modulates the received connection frequency information and sends the modulated connection frequency information to the demodulation and reception module;

[0013] Step S4, the demodulation and reception module receives and demodulates the connection frequency information. Then, the demodulation and reception module transmits the demodulated connection frequency information to the microphone CPU, and the microphone CPU receives and stores the connection frequency information;

[0014] Step S5, the microphone CPU records and adjusts the frequency of the audio transmitting antenna according to the connection frequency information, so that the audio transmitting antenna communicates and connects with the audio receiving antenna at the same frequency, forming an audio signal transmission channel, and the wireless microphone changes from the idle state to the used state;

[0015] Step S6, the audio transmitting antenna sends an audio signal to the audio receiving antenna. Then, the audio receiving antenna receives the audio signal and transmits the audio signal to the receiver CPU.

[0016] Further, after step S6, there are also steps S7, S8, and S9. Among them, in step S7, the wireless microphone in the use state sends an application signal at a predetermined frequency to the fixed-frequency receiving antenna of the receiver through the fixed-frequency transmitting antenna to apply for disconnection from the receiver; in step S8, the fixed-frequency receiving antenna of the receiver receives the application signal at the predetermined frequency, and then the fixed-frequency receiving antenna conveys the application signal to the receiver CPU. The receiver CPU then transmits connection frequency information or does not transmit connection frequency information to the modulation transmitting module according to user requirements; if the receiver CPU transmits connection frequency information to the modulation transmitting module, step S9 is executed; if the receiver CPU does not transmit connection frequency information, the microphone CPU does not control the audio transmitting antenna to disconnect the communication connection with the audio receiving antenna; in step S9, the demodulation receiving module of the wireless microphone in the use state receives and demodulates the connection frequency information, and then the demodulation receiving module transmits the demodulated connection frequency information to the microphone CPU. After receiving the connection frequency information, the microphone CPU controls the audio transmitting antenna to disconnect the communication connection with the audio receiving antenna.

[0017] The beneficial effects of the present invention are as follows: When the receiver receives an application signal sent by any wireless microphone, it sends connection frequency point information to the wireless microphone, enabling the wireless microphone to adjust and record the frequency of the audio transmitting antenna, and enabling the audio transmitting antenna and the audio receiving antenna at the same frequency to form a transmission channel for audio signals, realizing one-to-one simplex wireless data communication between the wireless microphone and the receiver, and enabling the wireless microphone to switch from the idle state to the use state; by setting multiple audio receiving antennas for signal reception at different frequencies, multiple transmission channels can be formed, avoiding the problem of mutual interference between signals when multiple wireless microphones communicate with the receiver wirelessly, and by the receiver sequentially matching with multiple wireless microphones through the above control method, wireless data communication between a single receiver and multiple wireless microphones is realized. In addition, the control method of the present invention has a simple principle and is easy to operate. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of steps 1 to 6.

[0019] Figure 2 It is a schematic diagram of steps 7 to 9.

[0020] Figure 3 It is a schematic diagram of the communication system.

[0021] Figure 4 It is a schematic diagram of each fixed-frequency transmitting antenna sending application information.

[0022] Figure 5Schematic diagram for the modulation transmission module to send connection frequency point information.

[0023] Among them, 11 - fixed - frequency transmitting antenna, 12 - demodulation receiving module, 13 - audio transmitting antenna, 14 - microphone control key module, 15 - audio acquisition module, 21 - fixed - frequency receiving antenna, 22 - modulation transmission module, 23 - audio receiving antenna, 24 - receiver control key module. Specific implementation mode

[0024] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the accompanying drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0025] Refer to Figure 3 , in this embodiment, a communication system of multiple wireless microphones and a receiver includes a receiver and multiple wireless microphones. Among them, the receiver includes a receiver CPU, a fixed - frequency receiving antenna 21, multiple audio receiving antennas 23, a modulation transmission module 22, and a receiver control key module 24. And the receiver control key module 24, the fixed - frequency receiving antenna 21, the audio receiving antenna 23, and the modulation transmission module 22 are electrically connected to the receiver CPU. The number of audio receiving antennas 23 is greater than or equal to the number of wireless microphones.

[0026] In this embodiment, the receiver CPU pre - stores multiple connection frequency point information. The modulation transmission module 22 is used to receive the connection frequency point information transmitted by the receiver CPU and to modulate the connection frequency point information. The multiple audio receiving antennas 23 are used to receive audio signals at different frequency points respectively. Among them, the number of connection frequency point information pre - stored in the receiver CPU is equal to the number of audio receiving antennas 23, and the frequency points recorded by the multiple connection frequency point information are respectively equal to the frequency points where the multiple audio receiving antennas 23 are located. The fixed - frequency receiving antenna 21 is used to receive the application signal at a predetermined frequency sent from the wireless microphone and transmit the application signal to the receiver CPU.

[0027] In this embodiment, the receiver control key module 24 is used to control the receiver CPU to transmit connection frequency point information to the modulation transmission module 22 or control the receiver CPU not to transmit connection frequency point information when the receiver CPU receives the application signal transmitted by the fixed - frequency receiving antenna 21. Among them, the receiver control key module 24 includes an OK key and a cancel key. When the receiver CPU receives the application signal transmitted by the fixed - frequency receiving antenna 21, if the OK key is pressed, the receiver CPU transmits the connection frequency point information to the modulation transmission module 22; if the cancel key is pressed, the receiver CPU does not transmit the connection frequency point information.

[0028] In this embodiment, each wireless microphone includes a microphone CPU, a fixed-frequency transmitting antenna 11, a demodulation and reception module 12, an audio transmitting antenna 13, an audio acquisition module 15, and a microphone control key module 14. Among them, the fixed-frequency transmitting antenna 11, the demodulation and reception module 12, the audio transmitting antenna 13, and the microphone control key module 14 are respectively electrically connected to the microphone CPU. The audio transmitting antenna 13 is electrically connected to the audio acquisition module 15.

[0029] In this embodiment, the fixed-frequency transmitting antenna 11 is used to send an application signal at a predetermined frequency to the fixed-frequency receiving antenna 21. Among them, the predetermined frequencies of the application signals of each wireless microphone are the same, and the fixed-frequency receiving antenna 21 receives the application signal at the predetermined frequency; in addition, the predetermined frequency is different from the frequency points of each connection frequency point information pre-stored in the receiver CPU. The microphone control key module 14 is used to control the fixed-frequency transmitting antenna 11 to send an application signal. Among them, the microphone control key module 14 includes a sending key. When the user presses the sending key, the fixed-frequency transmitting antenna 11 sends an application signal to the fixed-frequency receiving antenna 21.

[0030] In this embodiment, the demodulation and reception module 12 is used to receive and demodulate the connection frequency point information sent by the modulation and transmission module 22. The microphone CPU is used to save and process the connection frequency point information demodulated by the demodulation and reception module 12. Among them, the connection frequency point information records the frequency that the audio transmitting antenna 13 needs to reach. The microphone CPU adjusts the frequency point of the audio transmitting antenna 13 according to the connection frequency point information, so that the audio transmitting antenna 13 can send an audio signal to the audio receiving antenna 23 at the same frequency point as the audio transmitting antenna 13, realizing one-to-one simplex wireless data communication between the wireless microphone and the receiver.

[0031] In this embodiment, the audio acquisition module 15 is used to acquire the sound emitted by the user to the wireless microphone and convert the sound into an audio signal and transmit it to the audio transmitting antenna 13.

[0032] In this embodiment, the modulation and transmission module 22 can be an RF radio frequency communication module, an ASK modulation and transmission module 22, or other wireless communication modules with the same function; the demodulation and reception module 12 can also be an RF radio frequency communication module, an ASK demodulation and reception module 12, or other wireless communication modules with the same function. The receiver CPU and the microphone CPU can be various forms of processors such as MCU, ARM, CPU, DSP, etc.

[0033] In this embodiment, by using multiple audio receiving antennas 23 to receive audio signals at different frequency points, and by pre-storing multiple connection frequency point information at different frequency points in the receiver CPU, the problem of mutual interference between signals when multiple wireless microphones respectively perform wireless data communication with the receiver is avoided.

[0034] Reference Figures 1 to 5 , a control method for a communication system of multiple wireless microphones and a receiver, comprising the following steps:

[0035] Step S1, when multiple users respectively use the wireless microphones in the idle state and press the transmission key of the microphone control key module 14, the multiple wireless microphones in the idle state sequentially send application signals at a predetermined frequency to the fixed-frequency receiving antenna 21 of the receiver through the fixed-frequency transmitting antenna 11 to apply for connection with the receiver. The fixed-frequency receiving antenna 21 of the receiver sequentially receives the application signals, wherein the application signals record the information of the wireless microphones. The receiver and the wireless microphones in the idle state that send the application signals sequentially run steps S2 to S6. Specifically, when the fixed-frequency receiving antenna 21 receives the application signal sent by any fixed-frequency transmitting antenna 11, the receiver and the wireless microphone corresponding to the application information received by the current receiver run steps S2 to S6, realizing one-to-one simplex wireless data communication between multiple wireless microphones and the receiver in sequence.

[0036] Step S2, after the fixed-frequency receiving antenna 21 receives the application signal sent by any fixed-frequency transmitting antenna 11, the fixed-frequency receiving antenna 21 conveys the application signal to the receiver CPU. When the receiver receives the application signal, the indicator light of the receiver lights up to prompt the user to operate the receiver control key module 24. If the user presses the confirmation key of the receiver control key module 24, the receiver CPU transmits the connection frequency point information to the modulation transmitting module 22. At the same time, the receiver CPU records the currently transmitted connection frequency information when transmitting the connection frequency information, and binds the currently transmitted connection frequency information with the information of the wireless microphone corresponding to the application signal. Then, step S3 is run; if the user presses the cancel key of the receiver control key module 24, the receiver CPU does not transmit the connection frequency point information and returns to step S1.

[0037] Step S3, after the modulation transmitting module 22 receives the connection frequency information transmitted by the receiver CPU, the modulation transmitting module 22 modulates the connection frequency information and sends the modulated connection frequency information to the demodulation receiving module 12.

[0038] Step S4, after the demodulation receiving module 12 receives the connection frequency information sent by the modulation transmitting module 22, the demodulation receiving module 12 demodulates the connection frequency information and conveys the demodulated connection frequency information to the microphone CPU. Then, the microphone CPU receives and saves the connection frequency information.

[0039] Step S5, the microphone CPU adjusts and records the frequency of the audio transmitting antenna 13 according to the connection frequency information, so that the audio transmitting antenna 13 and the audio receiving antenna 23 at the same frequency form a transmission channel for audio signals, realizing one-to-one simplex wireless data communication between the wireless microphone and the receiver, and changing the wireless microphone from the idle state to the usage state.

[0040] Step S6, the audio acquisition module 15 acquires the sound emitted by the user to the wireless microphone and converts the sound into an audio signal for transmission to the audio transmitting antenna 13. Then, the audio receiving antenna 23 receives the audio signal and transmits the audio signal to the receiver CPU.

[0041] Refer to Figure 2 , after step S6, through steps S7 to S9, disconnect the wireless microphone in the usage state from the receiver, so that the wireless microphone changes from the usage state to the idle state.

[0042] Step S7, the wireless microphone in the usage state sends an application signal at a predetermined frequency to the fixed-frequency receiving antenna 21 of the receiver through the fixed-frequency transmitting antenna 11 to apply for disconnection from the receiver.

[0043] Step S8, after the fixed-frequency receiving antenna 21 receives the application signal sent by any fixed-frequency transmitting antenna 11, the fixed-frequency receiving antenna 21 conveys the application signal to the receiver CPU. When the receiver receives the application signal, the indicator light of the receiver lights up to prompt the user to operate the receiver control key module 24. If the user presses the confirmation key, the receiver CPU transmits the connection frequency point information recorded in step S2 to the modulation transmitting module 22 and runs step S9; if the user presses the cancel key, the receiver CPU does not transmit the connection frequency point information, and keeps the currently used wireless microphone in wireless data communication with the receiver.

[0044] Step S9, the demodulation receiving module 12 of the wireless microphone in the usage state receives and demodulates the connection frequency information. Then, the demodulation receiving module 12 transmits the demodulated connection frequency information to the microphone CPU. After receiving the connection frequency information, the microphone CPU controls the frequency of the audio transmitting antenna 13 to change to the disconnection frequency, where the disconnection frequency is different from both the predetermined frequency and the frequencies of each connection frequency point information, so that the audio transmitting antenna 13 is disconnected from the audio receiving antenna 23, disconnecting the wireless microphone in the usage state from the receiver and changing the wireless microphone from the usage state to the idle state.

[0045] For ease of explanation, it is assumed that the fixed-frequency transmitting antenna 11 transmits an application signal in step S1 as the first transmitted application signal. The fixed-frequency transmitting antenna 11 transmits an application signal in step S7 as the second transmitted application signal. Through the above settings, it is distinguished that the application signal transmitted by the fixed-frequency transmitting antenna 11 in step S1 is performed by the wireless microphone in the idle state, and it is distinguished that the application signal transmitted by the fixed-frequency transmitting antenna 11 in step S7 is performed by the wireless microphone in the use state.

[0046] In this embodiment, when the receiver receives an application signal sent by any wireless microphone, it sends connection frequency point information to the wireless microphone, causing the wireless microphone to adjust and record the frequency of the audio transmitting antenna 13, and causing the audio transmitting antenna 13 and the audio receiving antenna 23 at the same frequency to form a transmission channel for audio signals, realizing one-to-one simplex wireless data communication between the wireless microphone and the receiver, and causing the wireless microphone to change from the idle state to the use state; by setting multiple audio receiving antennas 23 that receive signals at different frequencies, multiple transmission channels can be formed, avoiding the problem of mutual interference between signals when multiple wireless microphones communicate with the receiver wirelessly respectively, and by the receiver sequentially matching with multiple wireless microphones through the above control method, wireless data communication between a single receiver and multiple wireless microphones is realized.

[0047] In this embodiment, by setting the microphone control key module 14, the user can cause the wireless microphone to send an application signal to apply for connection or disconnection from the receiver according to needs, and by setting the receiver control key module 24, the user can confirm or cancel the application sent by the wireless microphone according to needs, with simple operations and being convenient for non-professionals to operate. In addition, in the prior art, the communication connection between the wireless microphone and the receiver is disconnected by turning off the power, which causes the wireless microphone to be frequently switched on and off, reducing the durability of the wireless microphone and the battery. Compared with the prior art, through the above settings and operations in this embodiment, the wireless microphone can disconnect the communication connection with the receiver without turning off the power, avoiding the situation of frequent switching on and off of the wireless microphone.

[0048] The above-described embodiments are only preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make more possible changes and modifications to the technical solution of the present invention by using the disclosed technical content above, or the modifications are equivalent embodiments of the present invention. Therefore, all equivalent changes made according to the idea of the present invention without departing from the content of the technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A control method for a communication system of multiple wireless microphones and a receiver, characterized in that, It includes the following steps: Step S1, multiple wireless microphones in an idle state sequentially send application signals at a predetermined frequency to the fixed-frequency receiving antenna (21) of the receiver through the fixed-frequency transmitting antenna (11) to apply for connection with the receiver; the receiver and the wireless microphones in an idle state that send the application signals sequentially execute Steps S2 to S6; Step S2, the fixed-frequency receiving antenna (21) of the receiver receives the application signal at a predetermined frequency. Then, the fixed-frequency receiving antenna (21) conveys the application signal to the receiver CPU, and the receiver CPU then transmits connection frequency information or does not transmit connection frequency information to the modulation transmitting module (22) according to user requirements; if the receiver CPU transmits connection frequency information to the modulation transmitting module (22), Step S3 is executed; if the receiver CPU does not transmit connection frequency information, Step S1 is executed; Step S3, the modulation transmitting module (22) modulates the received connection frequency information and sends the modulated connection frequency information to the demodulation receiving module (12); Step S4, the demodulation receiving module (12) receives and demodulates the connection frequency information. Then, the demodulation receiving module (12) transmits the demodulated connection frequency information to the microphone CPU, and the microphone CPU receives and stores the connection frequency information; Step S5, the microphone CPU adjusts the frequency of the audio transmitting antenna (13) according to the connection frequency information, so that the audio transmitting antenna (13) communicates and connects with the audio receiving antenna (23) at the same frequency, forming an audio signal transmission channel, and the wireless microphone changes from the idle state to the use state; Step S6, the audio transmitting antenna (13) sends an audio signal to the audio receiving antenna (23). Then, the audio receiving antenna (23) receives the audio signal and transmits the audio signal to the receiver CPU.

2. The control method of a communication system between multiple wireless microphones and a receiver according to claim 1, characterized in that: After step S6, there are further steps S7, S8, and S9. Among them, in step S7, the wireless microphone in the used state sends an application signal at a predetermined frequency to the fixed-frequency receiving antenna (21) of the receiver through the fixed-frequency transmitting antenna (11) to apply for disconnection from the receiver; in step S8, the fixed-frequency receiving antenna (21) of the receiver receives the application signal at the predetermined frequency. Then, the fixed-frequency receiving antenna (21) conveys the application signal to the receiver CPU, and the receiver CPU then transmits connection frequency information or does not transmit connection frequency information to the modulation and transmission module (22) according to user requirements; if the receiver CPU transmits connection frequency information to the modulation and transmission module (22), step S9 is executed; if the receiver CPU does not transmit connection frequency information, the microphone CPU does not control the audio transmitting antenna (13) to disconnect the communication connection with the audio receiving antenna (23); in step S9, the demodulation and reception module (12) of the wireless microphone in the used state receives and demodulates the connection frequency information. Then, the demodulation and reception module (12) transmits the demodulated connection frequency information to the microphone CPU, and the microphone CPU controls the audio transmitting antenna (13) to disconnect the communication connection with the audio receiving antenna (23) after receiving the connection frequency information.

3. A communication system for multiple wireless microphones and a receiver to implement the control method of a communication system for multiple wireless microphones and a receiver according to any one of claims 1-2, comprising a receiver and multiple wireless microphones, characterized in that: The receiver includes a receiver CPU, a fixed-frequency receiving antenna (21), a plurality of audio receiving antennas (23), and a modulation transmitting module (22). Among them, the fixed-frequency receiving antenna (21), the audio receiving antennas (23), and the modulation transmitting module (22) are respectively electrically connected to the receiver CPU; the receiver CPU pre-stores information on a plurality of connection frequency points; the modulation transmitting module (22) is used to receive the connection frequency point information transmitted by the receiver CPU and modulate the connection frequency point information; the plurality of audio receiving antennas (23) are used to receive audio signals at different frequency points respectively; each wireless microphone includes a microphone CPU, a fixed-frequency transmitting antenna (11), a demodulation receiving module (12), and an audio transmitting antenna (13). Among them, the fixed-frequency transmitting antenna (11), the demodulation receiving module (12), and the audio transmitting antenna (13) are respectively electrically connected to the microphone CPU; the fixed-frequency receiving antenna (21) is used to receive the application signal at a predetermined frequency transmitted by the fixed-frequency transmitting antenna (11) and transmit the application signal to the receiver CPU; the demodulation receiving module (12) is used to receive and demodulate the connection frequency point information transmitted by the modulation transmitting module (22); the microphone CPU is used to save and process the connection frequency point information demodulated by the demodulation receiving module (12) and adjust the frequency point of the audio transmitting antenna (13) according to the connection frequency point information, so that the audio transmitting antenna (13) transmits an audio signal to the audio receiving antenna (23) at the same frequency point.

4. A communication system of multiple wireless microphones and a receiver according to claim 3, characterized in that: The wireless microphone further includes an audio acquisition module (15), and the audio transmitting antenna (13) is electrically connected to the audio acquisition module (15). Among them, the audio acquisition module (15) is used to acquire the sound made by the user to the wireless microphone and convert the sound into an audio signal and transmit it to the audio transmitting antenna (13).

5. A communication system for multiple wireless microphones and a receiver according to claim 3, characterized in that: The wireless microphone further includes a microphone control key module (14), and the microphone control key module (14) is electrically connected to the microphone CPU. Among them, the microphone control key module (14) is used to control the fixed-frequency transmitting antenna (11) to transmit an application signal.

6. A communication system for multiple wireless microphones and a receiver according to claim 3, characterized in that: The receiver further includes a receiver control key module (24), and the receiver control key module (24) is electrically connected to the receiver CPU. Among them, the receiver control key module (24) is used to control the receiver CPU to transmit connection frequency point information to the modulation transmitting module (22) or control the receiver CPU not to transmit connection frequency point information when the receiver CPU receives an application signal.

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