Multi-microphone system and audio system for digital signal transmission

Abstract

The invention provides a multi-microphone system for digital signal transmission, which comprises a first microphone and a second microphone, and is characterized in that the first microphone comprises a first radio module, a first input module and a first output module; the second microphone comprises a second radio module and a second output module. Wherein the first sound receiving module collects a first external sound signal and transmits the first external sound signal to the first output module, and the second sound receiving module collects a second external sound signal and transmits the second external sound signal to the second output module; the second output module outputs a second external sound signal to the first input module through the digital signal transmission channel, the first input module transmits the second external sound signal to the first output module, and the first output module is electrically connected with an external terminal. And is used for outputting the first external sound signal and the second external sound signal to an external terminal. According to the system, a digital signal transmission mode is used for replacing a traditional analog signal transmission mode, and the defects of signal interference, audio quality reduction and the like are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of microphones, and in particular to a multi-microphone system for digital signal transmission and an audio system. BACKGROUND

[0002] In the prior art, a multi-microphone system often adopts an analog signal transmission scheme combining an XLR interface and a quarter-inch interface to achieve cascaded use of multiple microphones. Specifically, two independent microphones are connected in series through an analog cable, wherein the first microphone receives the analog audio signal of the other microphone, and after preliminary processing of the two signals by a built-in sound card, the signals are transmitted to a terminal device through a single output interface. Such a scheme relies on wired transmission of analog signals, and requires multiple physical cables to connect the microphones and the terminal device, forming a chain-like signal path.

[0003] However, the prior art scheme has the following significant defects:

[0004] Firstly, analog signals are susceptible to electromagnetic interference, changes in wire impedance, and signal attenuation caused by long-distance transmission, resulting in a decrease in audio quality, such as an increase in noise floor and compression of dynamic range.

[0005] Secondly, the physical limitations of wired connections result in insufficient flexibility in device layout, especially in mobile scenarios or complex environments, where the entanglement of multiple cables, loose interfaces, and other issues increase the difficulty of deployment and maintenance, and the long-term plugging and unplugging of physical interfaces can cause poor contact, further affecting system reliability.

[0006] Therefore, there is an urgent need for a digital signal transmission scheme to solve the problems encountered by the traditional multi-microphone system. SUMMARY

[0007] The present application proposes a multi-microphone system for digital signal transmission, which replaces the traditional analog signal transmission method with a digital signal transmission method to avoid signal interference and audio quality degradation.

[0008] In a first aspect, a multi-microphone system for digital signal transmission includes:

[0009] a first microphone, the first microphone including a first sound receiving module, a first input module, and a first output module;

[0010] a second microphone, the second microphone including a second sound receiving module and a second output module;

[0011] The first sound collecting module collects a first external sound signal and transmits the first external sound signal to the first output module, and the second sound collecting module collects a second external sound signal and transmits the second external sound signal to the second output module; the second output module outputs the second external sound signal to the first input module through a digital signal transmission channel, the first input module transmits the second external sound signal to the first output module, and the first output module is electrically connected with an external terminal and is used for outputting the first external sound signal and the second external sound signal to the external terminal.

[0012] In a second aspect, a multi-microphone system for digital signal transmission comprises:

[0013] a first microphone comprising a first sound collecting module and a first output module;

[0014] a first digital signal receiver; and

[0015] a second microphone comprising a second sound collecting module and a second output module;

[0016] The first sound collecting module collects a first external sound signal and transmits the first external sound signal to the first output module, and the second sound collecting module collects a second external sound signal and transmits the second external sound signal to the second output module; the second output module outputs the second external sound signal to the first output module through the first digital signal receiver, the first digital signal receiver is wirelessly connected with the second output module through a digital signal transmission channel, the first output module is electrically connected with an external terminal and is used for outputting the first external sound signal and the second external sound signal to the external terminal.

[0017] In a third aspect, the present application provides an audio system comprising a terminal and a multi-microphone system for digital signal transmission.

[0018] Compared with the prior art, the multi-microphone system for digital signal transmission avoids analog signal attenuation and electromagnetic interference, and ensures audio purity. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0020] Figure 1 It is a first embodiment module schematic diagram of the multi-microphone system for digital signal transmission in the present application.

[0021] Figure 2 A module schematic diagram of a third embodiment of a multi-microphone system for digital signal transmission in the application;

[0022] Figure 3 A module schematic diagram of a third embodiment of a multi-microphone system for digital signal transmission in the application;

[0023] Figure 4 A module schematic diagram of a third embodiment of a multi-microphone system for digital signal transmission in the application; Figure 3 A specific module schematic diagram of a first digital signal receiver in the application; and

[0024] Figure 5 A module schematic diagram of a fourth embodiment of a multi-microphone system for digital signal transmission in the application.

[0025] Reference signs:

[0026] 10, 10', 50, 50', first microphone; 20, 30, 40, 60, 80, 90, second microphone; 101, 501, first sound receiving module; 102, 502, first analog-digital conversion module; 103, 503, first DSP module; 104, first input module; 304, second input module; 105, 505, first output module; 201, 301, 401, 601, 801, 901, second sound receiving module; 202, 302, 402, 602, 802, 902, second analog-digital conversion module; 203, 303, 403, 603, 803, 903, second DSP processing module; 205, 305, 405, 605, 805, 905, second output module; 100, 200, 300, 400, terminal; 504, first digital signal connection port; 804, second digital signal connection port; 70, 70', first digital signal receiver; 80', second digital signal receiver; 701, wireless receiving module; 702, decoding module; 703, power supply module; 704, LED display module; 705, port; DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0028] In order to make the above objectives, features and advantages of the application more obvious and understandable, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0029] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0030] The present application provides a first embodiment of a multi-microphone system module for digital signal transmission. Please refer to Figure 1 The system includes a first microphone 10 and a second microphone 20. In the present embodiment, the first microphone 10 includes a first sound collecting module 101, a first analog-to-digital conversion module 102, a first DSP (Digital Signal Processing) processing module 103, a first input module 104, and a first output module 105. The second microphone 20 includes a second sound collecting module 201, a second analog-to-digital conversion module 202, a second DSP processing module 203, and a second output module 205. In the present embodiment, the first sound collecting module 101 collects a first external sound signal and transmits it to the first output module 105. The first analog-to-digital conversion module 102 converts the collected first external sound signal into a first digital sound signal, the first DSP processing module 103 processes the above-mentioned first digital sound signal, and outputs it to the first output module 105. The second sound collecting module 201 collects a second external sound signal and transmits it to the second output module 205. Similarly, the second analog-to-digital conversion module 202 converts the collected second external sound signal into a second digital sound signal, the second DSP processing module 203 processes the above-mentioned second digital sound signal, and outputs it to the second output module 205. The second output module 205 outputs the second external sound signal to the first input module 104 through a digital signal transmission channel, and the first input module 104 transmits this second external sound signal to the first output module 105 through the first DSP processing module 103. At the same time, the first output module 105 is electrically connected to an external terminal 100, and is used to output the above-mentioned first external sound signal and second external sound signal to the external terminal 100.

[0031] Specifically, in the second microphone 20, the second sound collecting module 201 collects the second external sound signal, the second analog-digital conversion module 202 converts the second external sound signal into a second digital sound signal, and the second DSP processing module 203 performs noise reduction, encoding and other related processing on the second digital sound signal and outputs the second digital sound signal to the second output module 205. In the embodiment, the second output module 205 and the first input module 104 are electrically connected through a digital cable, the digital signal transmission channel is arranged in the digital cable, and the digital cable is a USB data line, a High Definition Multimedia Interface (HDMI) data line, a fiber data line or an optical fiber or Advanced Encryption Standard (AES) data line. The cable has a built-in shielding layer and an anti-interference circuit to ensure transmission stability. In other embodiments of the application, other connection methods can also be adopted and are not limited thereto. The second digital sound signal is transmitted to the first input module 104 in the form of PCM (Pulse Code Modulation) encoding. ， HDMI) data line, a fiber data line or an optical fiber or Advanced Encryption Standard (AES) data line. The cable has a built-in shielding layer and an anti-interference circuit to ensure transmission stability. In other embodiments of the application, other connection methods can also be adopted and are not limited thereto. The second digital sound signal is transmitted to the first input module 104 in the form of PCM (Pulse Code Modulation) encoding.

[0032] Similarly, in the first microphone 10, the first sound collecting module 101 collects the first external sound signal, the first analog-digital conversion module 102 converts the collected first external sound signal into a first digital sound signal, and the first DSP processing module 103 receives the first digital sound signal and the second digital sound signal from the second microphone 20, and synchronizes and mixes the two signals to output to the first output module 105. At this time, the first output module 105 receives the first digital sound signal and the second digital sound signal, i.e. the first external sound signal and the second external sound signal, and transmits them to the external terminal 100 in a wireless manner.

[0033] In other embodiments of the application, the digital signal transmission channel between the second output module 205 and the first input module 104 can also be a low-delay digital signal wireless communication channel, i.e. the second output module 205 transmits the second external sound signal to the first input module 104 in a wireless digital connection manner.

[0034] The wireless communication channel adopts a 2.4 GHz private wireless protocol channel, a low-delay standard Bluetooth LC3+ transmission channel, or a wireless broadcast transmission channel. The second microphone 20 compressively encodes the second external sound signal and wirelessly transmits it to the first microphone 10. The first input module 104 avoids interference through dynamic frequency hopping technology. At the same time, the wireless link supports a bidirectional handshake protocol to achieve signal synchronization and error retransmission. In this embodiment, the first input module 104 is a radio frequency antenna module arranged inside the first microphone 10, and the second output module 205 is a radio frequency antenna module arranged inside the second microphone 20. The antenna modules are LSR antennas, ceramic antennas, or micro antenna PCBs embedded inside the microphone housing to avoid external interference. At the same time, the radio frequency antenna module integrated in the second microphone 20 has built-in encryption pairing firmware, which is bound to the identity (ID) of the first microphone 10 at the factory, without the need for manual pairing by the user. The radio frequency antenna module integrated in the first microphone 10 supports double-channel signal concurrent reception, automatically identifies and synchronizes the audio signal of the second microphone 20. At the same time, the first microphone 10 has built-in anti-interference circuits (such as SAW filters) to suppress wireless Wi-Fi / Bluetooth signals in the same frequency band.

[0035] In summary, the second receiving module 201 of the second microphone 20 converts the collected second external sound signal into a second digital sound signal through the second analog-to-digital conversion module 202, and the second DSP processing module 203 processes the second digital sound signal and outputs it to the second output module 205. The digital audio signal is transmitted through 2.4 GHz encryption and uses time division multiple access (TDMA) technology to send data packets in time division. The first input module 104 of the first microphone 10 receives the data packets sent by the second output module 205 in real time, corrects errors through cyclic redundancy check (CRC), decodes and restores them into PCM streams, and sends them to the first DSP processing module 103. The first DSP processing module 103 synchronizes the clock of the first external sound signal and the decoded second external sound signal PCM stream, eliminates transmission delay differences, and performs mixing processing. The processed first external sound signal and second external sound signal are wirelessly output to the external terminal 100 through the first output module 105. In this embodiment, the first DSP processing module 103 and the second DSP processing module 203 use dynamic gain adjustment, ambient noise suppression (ANS), and frequency band equalization (EQ) algorithms to optimize sound quality. The first microphone 10 can select a mixing mode or an independent track output mode.

[0036] Figure 2Fig. 2 shows a module diagram of a second embodiment of a multi-microphone system for digital signal transmission according to the present application, which comprises a first microphone 10', at least two groups of second microphones 30 and 40, and a terminal 200. In this embodiment, the second microphone 30 comprises a second sound receiving module 301, a second analog-to-digital conversion module 302, a second DSP processing module 303, a second output module 305, and a second input module 304. The second microphone 40 comprises a second sound receiving module 401, a second analog-to-digital conversion module 402, a second DSP processing module 403, and a second output module 405. The second output module 405 of one group of second microphones 40 is electrically connected to the second input module 304 of another group of second microphones 30 through a digital signal transmission channel. Similarly, the second output module 405 outputs the third external sound signal received by the second sound receiving module 401 to the second input module 304 through the digital signal transmission channel, and the second input module 304 transmits the third external sound signal to the second output module 305 of another group of second microphones 30. At the same time, the second sound receiving module 301 also transmits the second external sound signal received to the second output module 305. Then, the second output module 305 outputs the second and third external sound signals to the first microphone 10' through the digital signal transmission channel. The first microphone 10' and Figure 1 The specific structure and functions of the first microphone 10' are the same as those of the first microphone 10, which will not be described here. Finally, the first microphone 10' outputs the second and third external sound signals received by the second microphones 30 and 40 and the first external sound signal received by itself to the external terminal 200.

[0037] Similarly, the second output module 405 of the microphone 40 and the second input module 304 of the microphone 30 can be electrically connected through a digital cable or wirelessly connected through a low-delay digital signal. When they are electrically connected through a digital cable, the digital signal transmission channel is provided in the digital cable, and the digital cable is a USB data cable, an HDMI data cable, an optical fiber data cable, or an AES data cable. When they are wirelessly connected through a low-delay digital signal, the digital signal transmission channel is a 2.4 GHz private wireless protocol transmission channel, a low-delay standard Bluetooth transmission channel, or a wireless broadcast transmission channel. In this embodiment, the second input module 304 is a radio frequency antenna module provided inside the second microphone 30, and the second output module 405 is a radio frequency antenna module provided inside the second microphone 40. The antenna modules are LSR antennas, ceramic antennas, or micro antenna PCBs embedded inside the microphone housing to avoid external interference.

[0038] Figure 3The third embodiment of the multi-microphone system for digital signal transmission is shown in the module diagram, which comprises a first microphone 50, a second microphone 60 and a first digital signal receiver 70. The first microphone 50 comprises a first sound collecting module 501, a first analog-digital conversion module 502, a first DSP processing module 503, a first output module 505 and a first digital signal connection port 504. The second microphone 60 comprises a second sound collecting module 601, a second analog-digital conversion module 602, a second DSP processing module 603 and a second output module 605.

[0039] In the embodiment, the first sound collecting module 501 collects the first external sound signal and transmits it to the first output module 505. The first analog-digital conversion module 502 is used to convert the collected first external sound signal into a first digital sound signal, and the first DSP processing module 503 is used to process the first digital sound signal and output it to the first output module 505. The second sound collecting module 601 collects the second external sound signal and transmits it to the second output module 605. Similarly, the second analog-digital conversion module 602 is used to convert the collected second external sound signal into a second digital sound signal, and the second DSP processing module 603 is used to process the second digital sound signal and output it to the second output module 605. The second output module 605 outputs the second digital sound signal to the first digital signal receiver 70 through a wireless digital signal transmission channel, and the first digital signal receiver 70 transmits the second external sound signal to the first output module 505. Meanwhile, the first output module 505 is electrically connected to the external terminal 300 and is used to output the first external sound signal and the second external sound signal to the external terminal 300.

[0040] In the embodiment, the first digital signal receiver 70 is detachably electrically connected to the first digital signal connection port 504, and the first digital signal connection port 504 is electrically connected to the first output module 505. The first digital signal connection port 504 can be a USB interface or other types of hot plug interfaces. The first digital signal receiver 70 receives the second external sound signal output by the second output module 605, decodes and checks it, and outputs the decoded digital signal to the first DSP processing module 503. The first DSP processing module 503 receives both the first digital sound signal and the second digital sound signal from the second microphone 20, synchronizes and mixes the two signals, and then outputs them to the first output module 505. At this time, the first output module 505 receives the first digital sound signal and the second digital sound signal, i.e., the first external sound signal and the second external sound signal, and transmits them to the external terminal 300 in a wireless manner.

[0041] Likewise, the digital signal transmission channel between the second output module 605 and the first digital signal receiver 70 is a 2.4GHz private wireless protocol transmission channel, a low-delay standard Bluetooth transmission channel, or a wireless broadcast transmission channel. Moreover, the second output module 605 is a radio frequency antenna module, such as an LSR antenna, a ceramic antenna, or a micro antenna PCB, which is arranged inside the second microphone 60. The second output module 605 supports single-channel digital signal transmission, with a transmission distance of ≤100 meters (depending on the degree of environmental interference), and a built-in encryption protocol (such as AES-128) to prevent signal interception.

[0042] With reference to Figure 4 , the first digital signal receiver 70 includes a wireless receiving module 701, a decoding module 702, a power supply module 703, an LED display module 704, and a port 705. The wireless receiving module 701 is configured to receive the second external sound signal output by the second output module 405, the decoding module 702 is configured to decode the second external sound signal, the power supply module 703 is configured to provide power supply for the first digital signal receiver 70, the LED display module 704 is configured to display the status of the first digital signal receiver 70, and the port 705 can be a USB interface or other types of hot plug interfaces, which is configured to connect the first digital signal connection port 504. Figure 3 The wireless receiving module 701 is a radio frequency antenna module, such as an LSR antenna, a ceramic antenna, or a micro antenna PCB, which is arranged inside the first digital signal receiver 70 and matched with the second output module 605 of the second microphone 60. The power supply module 703 can be a built-in button cell, or take power from the first microphone 50 through the first digital signal connection port 504. The LED display module 704 can display the current connection status of the first digital signal receiver 70 with the first microphone 50 and the second microphone 60, or the current network status.

[0043]

[0044] ​Similarly, the second sound collecting module 601 of the second microphone 60 collects a second external sound signal, converts the collected second external sound signal into a second digital sound signal through the second analog-digital conversion module 602, the second DSP processing module 603 processes and optimizes the second digital sound signal, and the second output module 605 outputs the second digital sound signal to the first digital signal receiver 70. The first digital signal receiver 70 performs CRC check error correction and decoding on the received second digital sound signal, restores the second digital sound signal into a PCM data stream, and transmits the PCM data stream to the first DSP processing module 503 through the first digital signal connection port 504. The first sound collecting module 501 collects a first external sound signal, converts the collected first external sound signal into a first digital sound signal through the first analog-digital conversion module 502, and the first DSP processing module 503 processes the first digital sound signal and the second digital sound signal transmitted through the first digital signal connection port 504, and outputs the processed first digital sound signal and the second digital sound signal to the first output module 505 after clock synchronization, noise reduction, and mixing. The first output module 505 transmits the first external sound signal and the second external sound signal to the external terminal 300 in a wireless manner. The first microphone 40 supports mixed output (single channel / stereo) or split track output (double channel independent).

[0045] In the embodiment, the first digital signal processor 70 triggers an automatic reconnection mechanism (≤3 seconds recovery) if it detects a signal loss between the first microphone 40 and the second microphone 60. The first digital signal processor 70 also supports multi-band switching, such as 2.4 GHz subchannels 1-10, to avoid external Wi-Fi interference.

[0046] In summary, the application scenarios of the application are illustrated by examples, for example: 1. Live interview: the second microphone (lapel microphone) is connected to the first microphone (desktop microphone) through 2.4 GHz wireless connection, the first microphone mixes the voices of two microphone users in real time, and outputs the mixed voice to a computer through USB to realize double sound source collection of the device. 2. Professional recording: the two microphones are directly connected through USB-C, the second microphone records two 32-bit audio signals, and the two 32-bit audio signals can be independently edited in the later stage.

[0047] In addition to the above-mentioned system with one first microphone and one second microphone, the application can also be applied to a multi-microphone system, such as Figure 5FIG2 shows a block diagram of a fourth embodiment of a multi-microphone system for digital signal transmission according to the present invention. The system includes a first microphone 50', at least two sets of second microphones 80 and 90, a first digital signal receiver 70', and a second digital signal receiver 80'. The second microphone 80 includes a second sound receiving module 801, a second analog-to-digital conversion module 802, a second DSP processing module 803, a second digital signal connection port 804, and a second output port 805. The second microphone 90 includes a second sound receiving module 901, a second analog-to-digital conversion module 902, a second DSP processing module 903, and a second output port 905. The second sound receiving module 801 of the second microphone 80 collects a second external sound signal and transmits it to the second output module 805. The second sound receiving module 901 of the second microphone 90 collects a third external sound signal and transmits it to the second output module 905. The second output module 905 outputs the received second and third external sound signals to the second output module 805 via the second digital signal receiver 80'. Furthermore, the second digital signal receiver 80' is electrically connected to the second output module 805 via the second digital signal connection port 804. The second output module 805 outputs the second and third external sound signals received by the second microphones 80 and 90 to the first microphone 50' via the first digital signal receiver 70, so that the first microphone 50' outputs the second and third external sound signals of the second microphones 80 and 90 and the first external sound signal received by itself to the external terminal 400. Figure 4 The specific structures and functions of the first microphone 50 and the first digital signal receiver 70 are the same and will not be described in detail here. The system of this embodiment realizes the digital signal transmission of multiple microphones in cascade.

[0048] In summary, the multi-microphone system of the present invention transmits via digital signals, avoiding analog signal attenuation and electromagnetic interference, and ensuring audio purity. The wireless transmission method can get rid of the constraints of wires, and the wired transmission method only requires single-line cascading, which increases the flexibility of deployment. In particular, the wireless transmission method has the following advantages: 1. Plug-and-play through the USB interface and factory pre-pairing eliminate the complexity of user configuration; 2. The built-in antenna does not need to be exposed, keeping the appearance of the device simple; 3. The closed hardware design reduces the risk of signal leakage; 4. Users can freely replace wireless receivers with different protocols; 5. Support "one-to-many" mode to achieve cascading of multiple microphones; 6. 2.4GHz dynamic frequency hopping + Listen-Before-Talk (LBT) mechanism avoids Wi-Fi congested channels, and digital signal transmission avoids electromagnetic interference in analog links, greatly enhancing anti-interference capabilities; 7. The wireless receiving end is connected via USB hot plug and can be replaced or upgraded without disassembling the device.

[0049] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0050] The above description is only the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A multi-microphone system for digital signal transmission, characterized in that: include: A first microphone, comprising a first sound receiving module, a first input module and a first output module; a second microphone, the second microphone comprising a second sound receiving module and a second output module; Among them, the first sound receiving module collects the first external sound signal and transmits it to the first output module, and the second sound receiving module collects the second external sound signal and transmits it to the second output module; the second output module outputs the second external sound signal to the first input module through the digital signal transmission channel, and the first input module transmits the second external sound signal to the first output module. The first output module is electrically connected to the external terminal and is used to output the first external sound signal and the second external sound signal to the external terminal.

2. A multi-microphone system for digital signal transmission according to claim 1, characterized in that: The second output module and the first input module are electrically connected via a digital cable, and the digital signal transmission channel is provided in the digital cable.

3. A multi-microphone system for digital signal transmission as claimed in claim 2, characterized in that: The digital cable is a USB data cable, an HDMI data cable, an optical fiber data cable or an AES data cable.

4. The multi-microphone system for digital signal transmission according to claim 1, wherein: The digital signal transmission channel is a low-latency digital signal wireless communication channel.

5. The multi-microphone system for digital signal transmission according to claim 4, wherein: The digital signal transmission channel is a 2.4 GHz private wireless protocol transmission channel, a low-latency standard Bluetooth transmission channel or a wireless broadcast transmission channel.

6. The multi-microphone system for digital signal transmission according to claim 4, wherein: The first input module is a radio frequency antenna module arranged inside the first microphone, and the second output module is a radio frequency antenna module arranged inside the second microphone.

7. A multi-microphone system for digital signal transmission as claimed in claim 6, characterized in that: The first output module and the second output module are LSR antennas, ceramic antennas or miniature antenna PCBs.

8. The multi-microphone system for digital signal transmission according to any one of claims 1 to 3, characterized in that: The second microphone further includes a second input module. The number of the second microphones is at least two groups, wherein the second output module on one group of the second microphones is electrically connected to the second input module on another group of the second microphones through a digital signal transmission channel.

9. The multi-microphone system for digital signal transmission according to any one of claims 4 to 7, characterized in that: The second microphone further includes a second input module. The number of the second microphones is at least two groups, wherein the second output module on one group of the second microphones is electrically connected to the second input module on another group of the second microphones through a digital signal transmission channel.

10. A multi-microphone system for digital signal transmission, characterized in that: include: A first microphone, comprising a first sound receiving module and a first output module; a first digital signal receiver; as well as a second microphone, the second microphone comprising a second sound receiving module and a second output module; Among them, the first sound receiving module collects the first external sound signal and transmits it to the first output module, and the second sound receiving module collects the second external sound signal and transmits it to the second output module; the second output module outputs the second external sound signal to the first digital signal receiver through a wireless digital signal transmission channel, and the first digital signal receiver transmits the second external sound signal to the first output module. The first output module is electrically connected to an external terminal and is used to output the first external sound signal and the second external sound signal to the external terminal.

11. The multi-microphone system for digital signal transmission according to claim 10, wherein: The first microphone further includes a first digital signal connection port, the first digital signal receiver is detachably and electrically connected to the first digital signal connection port, and the first digital signal connection port is electrically connected to the first output module.

12. The multi-microphone system for digital signal transmission according to claim 11, wherein: The digital signal transmission channel is a 2.4 GHz private wireless protocol transmission channel, a low-latency standard Bluetooth transmission channel or a wireless broadcast transmission channel.

13. The multi-microphone system for digital signal transmission according to claim 12, wherein: The second output module is a radio frequency antenna module arranged inside the second microphone.

14. The multi-microphone system for digital signal transmission according to claim 13, wherein: The second output module is an LSR antenna, a ceramic antenna or a miniature antenna PCB.

15. The multi-microphone system for digital signal transmission according to claim 10, wherein: The first digital signal receiver comprises: a wireless receiving module, configured to receive the second external sound signal output by the second output module; a decoding module, configured to decode the second external sound signal; a power supply module, configured to provide power to the first digital signal receiver; and The LED display module is used to display the status of the first digital signal receiver.

16. The multi-microphone system for digital signal transmission according to claim 15, wherein: The wireless receiving module is a radio frequency antenna module arranged inside the first digital signal receiver.

17. The multi-microphone system for digital signal transmission according to claim 16, wherein: The second output modules are all LSR antennas, ceramic antennas or miniature antenna PCBs.

18. The multi-microphone system for digital signal transmission according to any one of claims 10 to 17, characterized in that: The system further includes a second digital signal receiver, and the number of the second microphones is at least two groups, and the second output module on one group of the second microphones is communicatively connected to the second digital signal receiver via a wireless digital signal transmission channel.

19. The multi-microphone system for digital signal transmission according to claim 18, wherein: The other group of second microphones also includes a second digital signal connection port, the second digital signal receiver is detachably electrically connected to the second digital signal connection port, and the second digital signal connection port is electrically connected to the second output module of the second microphone in this group.

20. An audio system, characterized in that include; The multi-microphone system according to any one of claims 1 to 19; and The terminal is used to play the digital audio signal output by the multi-microphone system.

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