Communication system of wireless microphone

Abstract

The utility model relates to a communication system of a wireless microphone. The communication system comprises a main controller, a BLE control module, a radio frequency monitoring module and a radio frequency front-end module, the main controller is respectively connected with the BLE control module and the radio frequency front end module; the radio frequency front-end module is in communication connection with each wireless microphone through a radio frequency signal; the BLE control module is in communication connection with each wireless microphone through a Bluetooth protocol; the main controller controls the radio frequency front-end module to access each wireless microphone for communication through a radio frequency signal, and sends a broadcast signaling to each wireless microphone through the BLE control module so as to control each wireless microphone; according to the technical scheme, the utilization rate of spectrum resources and the communication efficiency of the wireless microphone can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless devices, in particular to a communication system of a wireless microphone. BACKGROUND

[0002] At present, wireless microphones are widely used in many scenes, such as activities, conference sites, KTV rooms, etc. Wireless microphones mainly include FM wireless microphones, VHF wireless microphones, UHF wireless microphones, Bluetooth wireless microphones, etc.

[0003] In the common technology, when the wireless microphone is used in pairing with the communication system, it relies on the radio frequency channel for control, the control channel and the data channel are shared, the synchronization delay is long, and it is difficult to realize the real-time recovery of the offline device spectrum, resulting in low spectrum resource utilization and communication efficiency. CONTENT OF THE UTILITY MODEL

[0004] In order to solve one of the above technical defects, the present application provides a communication system of a wireless microphone to improve the communication efficiency and effect of the wireless microphone.

[0005] A communication system of a wireless microphone, comprising: a main controller, a BLE control module and a radio frequency front-end module;

[0006] The main controller is connected to the BLE control module and the radio frequency front-end module respectively;

[0007] The radio frequency front-end module is connected to each wireless microphone through a radio frequency signal;

[0008] The BLE control module is connected to each wireless microphone through a Bluetooth protocol;

[0009] The main controller controls the radio frequency front-end module to access each wireless microphone through a radio frequency signal for communication, and sends broadcast signaling to each wireless microphone through the BLE control module to realize the control of each wireless microphone.

[0010] In one embodiment, the communication system of the wireless microphone further comprises a radio frequency monitoring module connected to the radio frequency front-end module, for analyzing and processing the radio frequency signal of the radio frequency front-end module.

[0011] A communication system of a wireless microphone, comprising: a main controller, a BLE control module, a radio frequency monitoring module and a radio frequency front-end module;

[0012] The main controller is connected to the BLE control module and the radio frequency front-end module respectively;

[0013] The radio frequency monitoring module is connected to the radio frequency front-end module;

[0014] The radio frequency front-end module is connected with each wireless microphone through radio frequency signals;

[0015] The BLE control module is connected with each wireless microphone through broadcast signaling;

[0016] The main controller controls the radio frequency front-end module to transmit radio frequency signals and receive radio frequency signals transmitted by the wireless microphone.

[0017] The radio frequency monitoring module is used for analyzing and processing the radio frequency signals of the radio frequency front-end module.

[0018] In one embodiment, the wireless microphone communication system, the radio frequency front-end module uses 630-698MHz ultra-high frequency band signals.

[0019] In one embodiment, the wireless microphone communication system, the main controller includes a low-power microcontroller chip;

[0020] The BLE control module includes a low-power Bluetooth chip;

[0021] The radio frequency front-end module includes an ultra-high frequency radio frequency chip;

[0022] The radio frequency monitoring module includes a radio frequency transceiver chip.

[0023] In one embodiment, the wireless microphone communication system, the low-power microcontroller chip is connected with the low-power Bluetooth chip through an SPI interface;

[0024] The ultra-high frequency radio frequency chip is connected with the radio frequency transceiver chip through an RF interface.

[0025] In one embodiment, the wireless microphone communication system, the low-power microcontroller chip adopts an SPI clock frequency configuration of 4MHz;

[0026] The low-power Bluetooth chip adopts a 2.4GHz frequency band and adopts a GFSK modulation mode for broadcast signaling.

[0027] In one embodiment, the wireless microphone communication system, the radio frequency transceiver chip is built-in with an ADC module and a processor.

[0028] In one embodiment, the wireless microphone communication system, the conversion rate of the ADC module is 20MSPS / 14bit.

[0029] In one embodiment, the wireless microphone communication system,

[0030] The low-power microcontroller chip adopts an STM32H743 chip;

[0031] The low-power Bluetooth chip used is the nRF52840 chip;

[0032] The ultra-high frequency radio frequency chip is the SX1276 chip;

[0033] The radio frequency transceiver chip used is the AD9361 chip.

[0034] In one embodiment, in the communication system of the wireless microphone, the main controller transmits control commands and spectrum management data to the BLE control module to control it to broadcast control signals to each wireless microphone.

[0035] In one embodiment, in the communication system of the wireless microphone, the radio frequency monitoring module acquires the radio frequency signal from the radio frequency front-end module and sequentially performs ADC sampling, digital down-conversion, filter filtering, and FFT spectrum analysis on the radio frequency signal.

[0036] In one embodiment, the wireless microphone includes a UHF communication module and a Bluetooth communication module.

[0037] The technical solution of the wireless microphone communication system of this application has the following beneficial effects:

[0038] (1) By using dual-mode collaborative control of the BLE control module and the RF front-end module, the utilization rate of spectrum resources and the communication efficiency of the wireless microphone are improved.

[0039] (2) Use BLE to broadcast control signals to each wireless microphone to achieve long-term stable control and management of each wireless microphone.

[0040] (3) Real-time monitoring of radio frequency signals through the radio frequency monitoring module facilitates real-time recovery and dynamic allocation of spectrum resources, effectively suppressing co-channel interference.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0042] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0043] Figure 1 This is a schematic diagram of an example wireless microphone system;

[0044] Figure 2 This is a schematic diagram of the communication system structure of a wireless microphone according to one embodiment;

[0045] Figure 3is a schematic diagram of a communication system structure of a wireless microphone of another embodiment;

[0046] Figure 4 is a schematic diagram of a wireless microphone structure of an embodiment;

[0047] Figure 5 is an interaction diagram of a communication system of a wireless microphone and the wireless microphone of an example. DETAILED DESCRIPTION

[0048] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters in the drawings and the description indicate the same or like elements or features.

[0049] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is further understood that the terms "comprising," "including," "containing," and "having" and the like, when used in the specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

[0050] The present application provides a communication system of a wireless microphone, as shown in Figure 1 Figure 1 is a schematic diagram of a wireless microphone system of an example, in which a host implements access to multiple wireless microphones 1-M, M≥2, each of the multiple wireless microphones 1-M communicates with the host through wireless radio frequency signals, M≥2, and the host controls and allocates spectrum resources to the wireless microphones after accessing the wireless microphones, and then communicates data with the wireless microphones. The communication system of the wireless microphone provided by the present application can be applied to a host as shown in Figure 1

[0051] Referring to Figure 2 Figure 2 ​​​A communication system structure schematic diagram of a wireless microphone in an embodiment, which comprises a main controller, a BLE (Bluetooth Low Energy) control module, and a radio frequency front-end module; wherein the main controller is connected with the BLE control module and the radio frequency front-end module respectively; the radio frequency front-end module is connected with each wireless microphone through radio frequency signals; the BLE control module is connected with each wireless microphone through Bluetooth protocol; the main controller controls the radio frequency front-end module to access each wireless microphone through radio frequency signals for communication, and sends broadcast signaling to each wireless microphone through the BLE control module to realize control of each wireless microphone.

[0052] Specifically, the main controller as a control core can control the radio frequency front-end module, so that it can transmit radio frequency signals to communicate with each wireless microphone, access the wireless microphone that is turned on to register, allocate spectrum resources for it and establish a data channel for communication; for example, the radio frequency front-end module uses 630-698MHz ultra-high frequency (UHF) signals; at the same time, the main controller also sends broadcast control signaling to each wireless microphone through the BLE control module, and each wireless microphone can receive the control signaling to accept the control and management of the main controller; since the radio frequency front-end module accesses the wireless microphone and communicates data with the accessed wireless microphone, and also manages each wireless microphone through an independent broadcast control signaling channel, it can realize dual-mode cooperative control of each wireless microphone, and improve the utilization rate of spectrum resources and the communication efficiency of the wireless microphone.

[0053] Reference Figure 3 As shown in the figure, Figure 3 A communication system structure schematic diagram of a wireless microphone in another embodiment.

[0054] In an embodiment, the communication system of the wireless microphone can further comprise a radio frequency monitoring module connected with the radio frequency front-end module, for analyzing and processing the radio frequency signals of the radio frequency front-end module to monitor the spectrum occupation state of the radio frequency signals. Through real-time monitoring of the radio frequency signals by the radio frequency monitoring module, real-time recovery and dynamic allocation of spectrum resources can be facilitated, and same-frequency interference can be effectively suppressed.

[0055] In an embodiment, the radio frequency front-end module of the present application can comprise an ultra-high frequency radio frequency chip, so as to realize communication in the UHF frequency band; for example, the radio frequency front-end module can use an SX1276 chip, which is a wireless communication chip with low power consumption, and also has the advantages of high sensitivity, multiple modulation modes, long distance transmission, multi-band support, etc., and it can be adapted to the application of 630-698MHz ultra-high frequency signals.

[0056] In one embodiment, the radio frequency monitoring module of the present application includes a radio frequency transceiver chip, which can realize the functions of transmitting and receiving radio frequency signals, such as analog-to-digital conversion, frequency conversion, signal filtering, and frequency analysis; for example, the radio frequency transceiver chip can be built-in with an ADC module and a processor, and preferably the conversion rate of the ADC module is 20MSPS / 14bit.

[0057] For example, the radio frequency transceiver chip can use AD9361 chip, which can integrate radio frequency front end, has low power consumption characteristics, can work stably for a long time, and has baseband processing, frequency synthesizer and other functions, can cover a wide range of working frequency, has high performance receiver and flexible interface, supports SPI, I2C and other digital interfaces, and is convenient for communication with external devices.

[0058] As in the above embodiment, the SX1276 chip and the AD9361 chip can be connected through the RF interface to be responsible for the transmission and reception processing of the UHF frequency band signal, the AD9361 chip is built-in with 20MSPS / 14bit ADC, and the processor can perform digital down-conversion processing on the received UHF frequency band signal, filter out the spurs through CIC+FIR filter set, and then realize spectrum analysis through 2048-point FFT to monitor the frequency band occupation state in real time, so as to realize real-time monitoring of radio frequency signals, facilitate real-time recovery and dynamic allocation of spectrum resources, and effectively suppress co-frequency interference.

[0059] In one embodiment, the main controller of the present application can include a low-power microcontroller chip, which realizes long-time stable control through low power consumption; for example, STM32H743 chip can be used, which is a microcontroller with ultra-low power consumption, has the characteristics of high performance, low power consumption, large capacity and rich peripheral interface, and can realize long-time control.

[0060] In one embodiment, the BLE control module of the present application can include a low-power Bluetooth chip, which can support Bluetooth protocol, has the characteristics of low power consumption and low cost, and is suitable for sending control signaling with high real-time requirement but low data rate; for example, the BLE chip can use nRF52840 chip, which is a multi-protocol SoC with complete protocol concurrency capability, supports low-power Bluetooth, and can realize long-time stable communication through extremely low power consumption.

[0061] As described in the above embodiment, the STM32H743 chip can transmit control commands and spectrum management data to the nRF52840 chip. The SPI clock frequency is configured to 4MHz to ensure data transmission stability. The nRF52840 chip is based on the 2.4GHz frequency band and uses GFSK (Gauss frequency Shift Keying) modulation to achieve low-power broadcasting of control signals. By utilizing low-power Bluetooth communication to broadcast control signals to each wireless microphone, stable access control and management of each wireless microphone can be achieved.

[0062] In one embodiment, reference Figure 4 As shown, Figure 4 This is a schematic diagram of a wireless microphone structure according to one embodiment. The wireless microphone may include a microprocessor and a Bluetooth communication module and a UHF communication module connected thereto. The radio frequency front-end module of the wireless microphone's communication system communicates with the UHF communication module of the wireless microphone via UHF band signals. The BLE control module of the wireless microphone's communication system communicates with the Bluetooth communication module of the wireless microphone via the Bluetooth protocol.

[0063] The communication system based on the wireless microphone in any of the foregoing embodiments can also be used in the following application examples:

[0064] In one application example, the RF monitoring module performs ADC sampling on the UHF band signal from the RF front-end module to obtain a digital signal. The processor performs digital down-conversion processing on the digital signal to obtain a down-converted signal, filters out spurious signals in the down-converted signal to obtain the required data signal, and can also perform FFT spectrum analysis on the down-converted signal to obtain the spectrum resource occupancy status.

[0065] For example, the parameters of the radio frequency front-end module can be: UHF band 630-698 MHz, step 50 kHz, transmit power 10-100 mW, and receive sensitivity -121 dBm@1% BER; the radio frequency monitoring module is built-in with a 20 MSPS / 14 bit ADC module, filters the signal through a CIC (Cascade Intergrator Comb) and FIR (Finite Impulse Response) filter set to filter out the spurious signal in the signal, and realizes spectrum analysis through a 2048-point FFT (Fast Fourier Transforming); the processor can monitor the spectrum resource occupation state in real time to determine whether there is a spectrum resource conflict, for example, uhf_snr < 10 dB (UHF band is disturbed) and ble_rssi < -80 dBm (BLE channel link quality is poor), or crc_error > 3 (data transmission error occurs frequently), and when there is a conflict, triggers a frequency hopping mechanism, reassigns the idle frequency points according to the spectrum occupation matrix, and records the conflicting UHF frequency points to a blacklist.

[0066] In one application example, the main controller transmits control instructions and spectrum management data to the BLE control module to control it to broadcast control signaling to each wireless microphone. The main controller can manage each wireless microphone and broadcast control signaling to each wireless microphone to control the access and use management of each wireless microphone through the broadcast control signaling.

[0067] In one application example, a three-way handshake protocol can be used to complete the access between the wireless microphone and the communication system. For example, the first handshake involves the wireless microphone sending a signed probe pulse to the communication system, using an FHSS (Frequency-Hopping Spread Spectrum) sequence, such as a Gold code-containing frequency-hopping sequence. The second handshake involves the communication system allocating dynamic parameter packets (frequency / time slot / power) to the wireless microphone, with a time constraint of host response time T3 ≤ 200ms. The third handshake involves dual-channel confirmation via BLE and UHF channels, with a time constraint of the sum of the confirmation times of the BLE and UHF channels, T4 ≤ 150ms. This completes the three-way handshake process. By adopting a dual-mode cooperative control architecture, a dual-mode communication link is established between the BLE and UHF channels, achieving time slot synchronization. The BLE control channel broadcast period T_adv is 1.28 seconds ± 5%, the UHF monitoring channel sampling window T_sense is 426.67 milliseconds ± 2%, and the time slot alignment error does not exceed 50 microseconds. When the wireless microphone is activated, it sends a frequency hopping probe pulse with a digital signature. The frequency hopping sequence uses Gold code (L=31, Chip Rate=1.2288Mcps). The main controller dynamically allocates operating parameters based on the spectrum occupancy matrix, giving priority to meeting the bandwidth requirements of the voice stream (≥200kHz), reserving a guard interval for the control channel (≥50kHz), and suppressing the transmit power of uncertified wireless microphones (ΔP≥-6dB).

[0068] Based on a dual-mode cooperative control architecture employing a three-way handshake protocol—namely, Bluetooth Low Energy (BLE) and Ultra High Frequency (UHF) dual-mode cooperative control—more secure access applications are possible. A wireless microphone sends a signed probe pulse, and the communication system verifies the device's legitimacy through the signature, preventing unauthorized wireless microphone access. After the communication system allocates dynamic parameter packets, the wireless microphone performs dual-channel confirmation in both BLE and UHF to ensure parameter reception integrity. Because the three-way handshake protocol incorporates FHSS frequency hopping sequences and a dual-channel confirmation mechanism, a re-handshake can be performed if either channel fails, reducing the command loss rate and thus providing higher reliability. The dynamic parameter packet contains randomly generated combinations of frequencies, time slots, and frequencies; the parameters change with each handshake, preventing spectrum parameters from being eavesdropped on and reused, ensuring communication reliability and security, thus providing higher security and reducing control signaling loss rate. This makes it particularly suitable for wireless microphone cluster communication in high-density conference scenarios.

[0069] In one application example, refer to Figure 5 As shown, Figure 5It is a communication system of a wireless microphone and a wireless microphone interaction block diagram, the main controller can use AES-128-CTR technology to encrypt the erase instruction of the wireless microphone, the encryption key is bound with the device fingerprint, and the radio frequency fingerprint and the space signature of the wireless microphone are collected and the unique device identification matching the erase instruction is generated. The erase instruction can be encrypted by using the AES-128 algorithm, the encryption key is bound with the device fingerprint of the wireless microphone, and it is ensured that the erase instruction is only parsed by the wireless microphone; the carrier frequency offset statistical characteristics and the multipath time delay spread parameters of the wireless microphone are collected, and the unique device identification is generated, and the erase instruction needs to match the identification to be executed; the erase confirmation instruction is sent through the BLE control channel, the UHF data channel and the standby NFC channel at the same time, and the wireless microphone needs to receive the legal encrypted instruction through the three channels and match the fingerprint, and then execute the registration information erase, so as to ensure the uniqueness and non-repudiation of the erase operation, and realize the safe erase of the offline wireless microphone.

[0070] The communication system of the wireless microphone of the present application has been effectively improved in terms of anti-interference, as shown in the following anti-interference test data:

[0071] ;

[0072] In terms of spectrum efficiency: the spectrum utilization rate is improved to 89%, which is increased by 26 percentage points compared with the traditional scheme; the channel switching time is shortened to 320 milliseconds, which improves the communication efficiency. In terms of safety performance, the three-factor verification protocol effectively blocks the replay attack, and the safety performance is significantly improved, and the erase success rate of the wireless microphone reaches 100%, avoiding the risk of illegal reuse. In terms of compatibility: it meets the FCC Part 74.861 authentication standard, the stray radiation is lower than-65dBc, meets the ETSI EN303 340 radiation standard, and the out-of-band leakage is lower than-49dBm.

[0073] The above only describes some embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A communication system for a wireless microphone, characterized by Comprise: A main controller, a BLE control module and a radio frequency front-end module; The main controller is connected to the BLE control module and the radio frequency front-end module respectively; The radio frequency front-end module is connected to each wireless microphone through radio frequency signals; The BLE control module is connected to each wireless microphone through Bluetooth protocol; The main controller controls the radio frequency front-end module to access each wireless microphone through radio frequency signals and sends broadcast signaling to each wireless microphone through the BLE control module to realize the control of each wireless microphone.

2. The wireless microphone communication system of claim 1, wherein, Further comprise: A radio frequency monitoring module connected to the radio frequency front-end module, used for analyzing and processing the radio frequency signals of the radio frequency front-end module to monitor the spectrum occupation state of the radio frequency signals.

3. The wireless microphone communication system of claim 1, wherein, The radio frequency front-end module uses 630-698MHz ultra-high frequency band signals.

4. The wireless microphone communication system of claim 2, wherein, The main controller comprises a low-power microcontroller chip; The BLE control module comprises a low-power Bluetooth chip; The radio frequency front-end module comprises an ultra-high frequency radio frequency chip; The radio frequency monitoring module comprises a radio frequency transceiver chip.

5. The wireless microphone communication system of claim 4, wherein, The low-power microcontroller chip is connected to the low-power Bluetooth chip through an SPI interface; The ultra-high frequency radio frequency chip is connected to the radio frequency transceiver chip through an RF interface.

6. The wireless microphone communication system of claim 5, wherein, The SPI clock frequency of the low-power microcontroller chip is configured as 4MHz; The low-power Bluetooth chip uses 2.4GHz frequency band and adopts GFSK modulation mode for broadcast signaling.

7. The wireless microphone communication system of claim 5, wherein, The radio frequency transceiver chip is built-in with an ADC module and a processor; The conversion rate of the ADC module is 20MSPS / 14bit.

8. The communication system of the wireless microphone according to claim 7, wherein The low-power microcontroller chip adopts an STM32H743 chip; The low-power Bluetooth chip adopts an nRF52840 chip; The ultra-high frequency radio frequency chip adopts an SX1276 chip; The radio frequency transceiver chip adopts an AD9361 chip.

9. The wireless microphone communication system of claim 7, wherein, The main controller transmits control instructions and spectrum management data to the BLE control module to control it to broadcast and send control signaling to each wireless microphone; The radio frequency monitoring module collects the radio frequency signals of the radio frequency front-end module and sequentially performs ADC sampling, digital down-conversion, filter filtering and FFT spectrum analysis processing on the radio frequency signals.

10. The wireless microphone communication system of claim 3, wherein, The wireless microphone comprises a UHF communication module and a Bluetooth communication module.

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