Audio Synchronous Transmission and Low-Latency Control Method Based on Dual-Mode Wireless Communication

Abstract

This invention discloses a method for audio synchronous transmission and low-latency control based on dual-mode wireless communication. It is implemented using a WiFi 6 + BLE 5.0 dual-mode wireless carrier and employs a master-slave link dynamic division of labor logic. WiFi 6 serves as the high-speed audio master link, and BLE 5.0 serves as the synchronization control slave link, operating collaboratively. The method achieves global clock unification, end-to-end transmission latency ≤20ms, and multi-terminal synchronization deviation ≤2ms through a dedicated clock synchronization calibration algorithm, quantized latency calculation and closed-loop compensation formula, and multi-terminal audio synchronization correction mechanism. It also includes dual-mode redundancy backup and seamless switching logic, addressing the pain points of poor synchronization, high latency, and weak anti-interference in single-mode wireless audio transmission. This invention requires no modification to existing hardware, achieving performance optimization solely through software algorithms. It is compatible with various audio terminals and complex scenarios, balancing high-fidelity transmission, high-precision synchronization, and ultra-low latency control, making it suitable for various professional and consumer-grade wireless audio transmission scenarios.

Description

Technical Field

[0001] This invention belongs to the field of wireless audio transmission, embedded real-time control and dual-mode communication collaboration technology, specifically involving an audio synchronous transmission and low-latency control method based on dual-mode wireless communication. Background Technology

[0002] In the field of wireless audio transmission and real-time control, audio signal transmission latency, multi-terminal synchronization accuracy, and communication stability are core technical indicators that directly determine audio playback quality, real-time control response speed, and user experience. Existing wireless audio transmission solutions mostly employ a single WiFi or Bluetooth (BLE) communication mode, which, along with several unavoidable technical defects, can no longer meet the high synchronization, low latency, and high stability transmission requirements of professional scenarios. The specific core pain points are as follows:

[0003] First, single-mode communication has obvious shortcomings. Single WiFi communication mode has sufficient bandwidth and fast transmission rate, but low clock synchronization accuracy, large synchronization deviation in multi-terminal networking, high power consumption during idle periods, and weak anti-interference ability at close range, which can easily lead to audio stuttering and disconnection problems. Single BLE Bluetooth communication mode has low power consumption, stable connection and good clock synchronization, but limited transmission bandwidth, can only transmit low bit rate audio signals, cannot adapt to high-fidelity lossless audio transmission, and suffers severe attenuation over long distances, which limits its applicable scenarios.

[0004] Second, the audio synchronization accuracy of multiple terminals is insufficient. Existing technology does not have a precise cross-terminal clock calibration algorithm. When multiple devices play synchronously, there are obvious problems of audio-visual asynchrony and multi-speaker channel deviation. The synchronization deviation usually exceeds 50ms, which cannot meet the high-precision synchronization requirements of professional audio and live broadcast.

[0005] Third, transmission delay is uncontrollable and lacks closed-loop compensation. Audio transmission delay is greatly affected by channel interference, distance, and number of terminals. Existing solutions only perform basic transmission and lack delay detection, prediction, and closed-loop compensation mechanisms. End-to-end delay generally exceeds 80ms, and real-time control response is lagging.

[0006] Fourth, dual-mode communication lacks an efficient coordination mechanism. Some simple dual-mode solutions only achieve passive switching, without dynamic division of labor and seamless connection logic between master and slave links. During the switching process, audio packet loss, audio dropout, and synchronization loss are prone to occur, and it is impossible to meet the triple requirements of low power consumption, high bandwidth, and high synchronization.

[0007] Fifth, without the support of quantization algorithms, synchronous calibration and delay control rely heavily on empirical parameter tuning, lacking dedicated mathematical calculation formulas, resulting in poor parameter adaptability and significant fluctuations in stability and accuracy under different scenarios.

[0008] To address the aforementioned technical deficiencies, existing industry solutions are limited to optimizing single-mode communication rates or supplementing basic synchronization logic. They have not formed a systematic approach integrating "dual-mode wireless dynamic collaboration + precise clock synchronization + low-latency closed-loop control + packet loss compensation," nor have they developed a technical solution that deeply binds dual-mode division of labor logic, synchronization calibration algorithms, and delay compensation formulas. Furthermore, no existing technology provides relevant technical inspiration. Therefore, this invention possesses prominent substantive features and significant progress, meeting the statutory requirements of patent law regarding inventiveness and utility. Summary of the Invention

[0009] This invention addresses the core technical pain points of existing wireless audio transmission technologies, such as the performance limitations of single-mode, large synchronization deviations among multiple terminals, high transmission latency, and poor dual-mode coordination. It provides a method for audio synchronization transmission and low-latency control based on dual-mode wireless communication. The aim is to establish a high-bandwidth, low-power, and highly stable transmission link through dynamic master-slave collaboration between WiFi 6 and BLE 5.0 dual-mode wireless communication; achieve zero-deviation audio synchronization among multiple terminals through a dedicated clock synchronization calibration algorithm and audio synchronization compensation formula; control end-to-end transmission latency to within 20ms through real-time latency detection and closed-loop control mechanisms; and simultaneously achieve seamless dual-mode switching and intelligent packet loss repair, balancing high-fidelity audio transmission, high-precision synchronization, and ultra-low latency control, making it suitable for various professional and consumer-grade wireless audio scenarios.

[0010] To achieve the above objectives, the present invention provides an audio synchronization transmission and low-latency control method based on dual-mode wireless communication. This method is implemented on a dual-mode wireless communication hardware carrier of WiFi 6 and BLE 5.0, and adopts a master-slave link dynamic division of labor mode, setting WiFi 6 as the high-speed audio data master link and BLE 5.0 as the synchronization control slave link. The core process of the method includes global clock synchronization calibration, dual-mode division of labor transmission, real-time delay detection, audio synchronization compensation, and closed-loop delay control.

[0011] The BLE5.0 link completes the unified global clock calibration of multiple terminals, eliminating cross-terminal clock deviation; the WiFi6 main link carries high bit rate audio data transmission, and the two links interact with each other; the end-to-end transmission delay and multi-terminal synchronization deviation are detected in real time, and the closed-loop compensation algorithm is used to correct them synchronously, ultimately achieving multi-terminal audio synchronous transmission and ultra-low latency control. There is no audio packet loss, no dropout, and no synchronization loss during the dual-mode switching process.

[0012] Preferably, the global clock synchronization calibration is performed using a dedicated clock synchronization algorithm via a BLE5.0 link, and the core clock deviation calibration formula is: In the formula: This represents the total deviation of the terminal clock. The main control terminal reference clock, For the terminal's local clock, For BLE5.0 link clock command transmission delay; calibration rule is: when If the clock synchronization is deemed satisfactory, and exceeds the threshold, global clock unification is achieved by fine-tuning the local clock on the terminal.

[0013] Preferably, the dual-mode split transmission adopts dynamic link scheduling logic. When the audio bitrate is higher than the 44.1kHz / 16bit high-fidelity standard, the WiFi 6 main link is used to transmit audio data throughout, while the BLE 5.0 link only transmits synchronization and control commands. When the audio bitrate is lower than the 32kbps low-bitrate standard, it automatically switches to BLE 5.0 single-mode low-power transmission, and the WiFi 6 link goes into sleep mode to reduce power consumption. The dual-mode switching threshold can be adaptively adjusted, and the time from switching trigger to link stabilization is ≤5ms.

[0014] Preferably, the real-time delay detection and closed-loop delay control adopt a quantized delay calculation and active compensation mechanism, and the core end-to-end delay calculation formula is:

[0015] In the formula: For actual end-to-end transmission delay, Send timestamps for audio data. For audio data reception timestamps, To address the latency issue in terminal hardware processing, the system sets a latency control threshold of ≤20ms. If the threshold is exceeded, latency closed-loop compensation is achieved by compressing audio frame headers and optimizing channel scheduling.

[0016] Preferably, the audio synchronization compensation performs precise correction for playback deviations across multiple terminals, and the core audio synchronization compensation formula is:

[0017]

[0018] In the formula: This refers to the actual audio playback trigger time on the terminal. This is the global standard playback time; after calibration using this formula, the audio synchronization deviation across multiple terminals is ≤2ms, eliminating issues such as channel misalignment and audio-visual asynchrony.

[0019] Preferably, the method incorporates a dual-mode link redundancy backup mechanism. When the WiFi 6 main link is interfered with and the packet loss rate is greater than 1% or the signal strength is less than -70dBm, BLE5.0 will take over the temporary audio transmission from the link. At the same time, the main control terminal will automatically optimize the WiFi 6 channel. After the link is restored, it will seamlessly switch back to the main link, ensuring that the audio transmission is smooth and uninterrupted throughout the entire process.

[0020] Preferably, the multi-terminal network supports a master-slave topology, and can accommodate up to 16 audio slave terminals in a single network setup. All slave terminals share the global reference clock of the master control terminal, and the synchronization calibration command is broadcast. The network expansion process does not affect the synchronization accuracy and latency performance of the existing terminals.

[0021] Preferably, the closed-loop delay control is accompanied by audio frame lightweight optimization logic, which automatically removes redundant frame headers for high-latency channels, adopts adaptive bitrate compression, and prioritizes the bitrate as the latency is lower, without compromising audio fidelity, with a delay compensation response time ≤3ms.

[0022] Preferably, the method is compatible with various embedded audio terminals, wireless speakers, and live audio equipment. It does not require modification of the existing hardware structure and achieves dual-mode collaboration, synchronous calibration, and delay control only through software algorithms, adapting to the wireless audio transmission needs of various scenarios such as indoor, outdoor, and industrial interference.

[0023] This invention addresses the core pain points of existing single-mode wireless audio transmission, such as poor synchronization, high latency, and weak dual-mode coordination. Through dual-mode collaborative operation of WiFi 6 and BLE 5.0, quantization algorithm calibration, and closed-loop control optimization, it achieves multiple core breakthroughs compared to traditional technologies. The overall advantages are intuitive and clear, and the beneficial effects are as follows:

[0024] First, dual-mode collaborative performance is optimal, completely compensating for the shortcomings of single-mode communication. It adopts a dedicated division of labor: WiFi 6 main link transmits high-fidelity audio, while BLE 5.0 slave link is responsible for clock synchronization and command control. The seamless switching time between the two modes is ≤5ms, with no audio packet loss, dropout, or synchronization loss during the entire switching process. At the same time, it takes into account high bandwidth transmission, low power consumption, and high stability, solving the performance defects that cannot be achieved by a single WiFi or BLE mode.

[0025] Secondly, the multi-terminal synchronization accuracy has been significantly improved, meeting the essential needs of professional scenarios. Relying on a dedicated clock calibration and audio synchronization compensation algorithm, the cross-terminal clock deviation is controlled within 1ms, and the overall audio synchronization deviation is ≤2ms, which is far superior to the synchronization deviation level of more than 50ms of existing technologies. This completely eliminates the problems of audio and video desynchronization and channel misalignment, and can directly meet the high-precision requirements of professional live broadcasting, distributed sound systems, and other scenarios.

[0026] Third, it achieves millisecond-level low latency and closed-loop controllability, breaking through the bottleneck of latency management. A real-time latency detection and active compensation mechanism is established, and the end-to-end transmission latency is stably controlled within 20ms, with an average latency as low as 13-15ms. The latency compensation response is rapid, solving the industry bottleneck of high latency, large fluctuations, and no compensation in traditional audio transmission, and adapting to professional scenarios with high latency sensitivity.

[0027] Fourth, the anti-interference capability and link stability are greatly enhanced, adapting to complex scenarios. With a built-in dual-mode redundancy backup mechanism, when the WiFi 6 main link is interfered with, the BLE 5.0 link can instantly take over temporary transmission. Once the main link recovers, it seamlessly switches back, ensuring uninterrupted and smooth audio transmission throughout the entire process. This makes it suitable for complex environments such as industrial sites and multi-device interference.

[0028] Fifth, it boasts strong versatility, low deployment cost, and compatibility with various terminals and scenarios. No modification to existing audio terminal hardware is required; all core functions can be implemented solely through software algorithms. It is compatible with various embedded audio devices, wireless speakers, and other terminals, supports a 1-master-16-slave network configuration, has a wide range of scenario adaptability, requires no complex manual debugging, and is easy to deploy and promote.

[0029] Sixth, significant power consumption optimization extends device battery life. In low-bitrate voice scenarios, it can automatically switch to BLE5.0 single-mode low-power transmission, and the WiFi 6 link simultaneously goes into sleep mode, reducing device standby power consumption by more than 75%. This effectively compensates for the high power consumption and short battery life of traditional WiFi audio devices, making it suitable for portable wireless audio devices. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a block diagram of the overall architecture of the audio synchronous transmission and low latency control method based on dual-mode wireless communication provided in an embodiment of the present invention.

[0032] Figure 2 This is a flowchart illustrating the complete execution logic of the method provided in this embodiment of the invention.

[0033] Figure 3 This is a block diagram of dual-mode link redundancy switching and coordination provided in an embodiment of the present invention.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] The audio synchronization transmission and low-latency control method based on dual-mode wireless communication in this embodiment refers to... Figures 1 to 3Based on dual-mode wireless communication hardware carriers of WiFi 6 and BLE 5.0, the method adopts a master-slave dynamic division of labor mode, setting WiFi 6 as the high-speed audio data master link and BLE 5.0 as the synchronous control slave link; the core process of the method includes global clock synchronization calibration, dual-mode division of labor transmission, real-time delay detection, audio synchronization compensation and closed-loop delay control.

[0037] The BLE5.0 link completes the unified global clock calibration of multiple terminals, eliminating cross-terminal clock deviation; the WiFi6 main link carries high bit rate audio data transmission, and the two links interact with each other; the end-to-end transmission delay and multi-terminal synchronization deviation are detected in real time, and the closed-loop compensation algorithm is used to correct them synchronously, ultimately achieving multi-terminal audio synchronous transmission and ultra-low latency control. There is no audio packet loss, no dropout, and no synchronization loss during the dual-mode switching process.

[0038] This method is based on a framework of WiFi 6+BLE 5.0 dual-mode hardware carrier, dynamic division of labor between master and slave links, and progressive execution of four core processes. It is the smallest set of technologies to solve the core technical problems of dual-mode collaborative transmission, multi-terminal audio synchronization, and ultra-low latency control. In this method, WiFi 6 undertakes the high-speed audio data master link and BLE 5.0 undertakes the synchronization control slave link, which is a dedicated division of labor logic that is different from the existing single-mode transmission and inefficient dual-mode switching solutions.

[0039] Furthermore, the global clock synchronization calibration executes a dedicated clock synchronization algorithm via the BLE5.0 link, and the core clock deviation calibration formula is:

[0040]

[0041] In the formula: This represents the total deviation of the terminal clock. The main control terminal reference clock, For the terminal's local clock, For BLE5.0 link clock command transmission delay; calibration rule is: when If the clock synchronization is deemed satisfactory, and exceeds the threshold, global clock unification is achieved by fine-tuning the local clock on the terminal.

[0042] By using a proprietary mathematical formula to quantify and calibrate clock deviation, the traditional fuzzy synchronization logic is abandoned, and the terminal clock deviation is strictly controlled within 1ms, thus fundamentally solving the industry pain point of multi-terminal synchronization problems.

[0043] Furthermore, the dual-mode distributed transmission employs dynamic link scheduling logic. When the audio bitrate is higher than the 44.1kHz / 16bit high-fidelity standard, the WiFi 6 main link is used throughout to transmit audio data, while the BLE 5.0 link only transmits synchronization and control commands. When the audio bitrate is lower than the 32kbps low-bitrate standard, it automatically switches to BLE 5.0 single-mode low-power transmission, and the WiFi 6 link goes into sleep mode to reduce power consumption. The dual-mode switching threshold can be adaptively adjusted, and the time from switching trigger to link stabilization is ≤5ms. The transmission mode is adaptively switched according to the audio bitrate, balancing the needs of high-fidelity audio transmission with the low-power operation requirements of the device, while limiting the dual-mode switching time to ≤5ms to prevent audio stuttering and dropouts.

[0044] Furthermore, the real-time delay detection and closed-loop delay control employ a quantized delay calculation and active compensation mechanism. The core end-to-end delay calculation formula is as follows:

[0045]

[0046] In the formula: For actual end-to-end transmission delay, Send timestamps for audio data. For audio data reception timestamps, To address the latency issue in terminal hardware processing, the system sets a latency control threshold of ≤20ms. If the threshold is exceeded, latency closed-loop compensation is achieved by compressing audio frame headers and optimizing channel scheduling.

[0047] We quantify and standardize the real-time latency detection and closed-loop control process, setting a stringent end-to-end latency control threshold of ≤20ms. We achieve proactive closed-loop latency compensation through frame header compression and channel optimization, thus solving the shortcomings of traditional solutions that lack uncontrollable latency and compensation mechanisms.

[0048] Furthermore, the audio synchronization compensation performs precise correction for playback deviations across multiple terminals, and the core audio synchronization compensation formula is:

[0049]

[0050] In the formula: This refers to the actual audio playback trigger time on the terminal. This is the global standard playback time; after calibration using this formula, the audio synchronization deviation across multiple terminals is ≤2ms, eliminating issues such as channel misalignment and audio-visual asynchrony.

[0051] Furthermore, the method incorporates a dual-mode link redundancy backup mechanism. When the WiFi 6 main link is interfered with and the packet loss rate is greater than 1% or the signal strength is less than -70dBm, BLE5.0 will take over the temporary audio transmission from the link. At the same time, the main control terminal will automatically optimize the WiFi 6 channel. After the link is restored, it will seamlessly switch back to the main link, ensuring that the audio transmission is smooth and uninterrupted throughout the entire process.

[0052] Furthermore, the multi-terminal networking supports a master-slave topology, and can accommodate up to 16 audio slave terminals in a single networking operation. All slave terminals share the global reference clock of the master control terminal, and the synchronization calibration command is broadcast. The networking expansion process does not affect the synchronization accuracy and latency performance of the existing terminals.

[0053] Furthermore, the closed-loop delay control is equipped with lightweight audio frame optimization logic, which automatically removes redundant frame headers for high-latency channels, adopts adaptive bitrate compression, and prioritizes the bitrate as the latency is lower, without compromising audio fidelity, with a delay compensation response time of ≤3ms.

[0054] In this embodiment, the method is compatible with various embedded audio terminals, wireless speakers, and live audio equipment. It does not require modification of the existing hardware structure. It achieves dual-mode collaboration, synchronous calibration, and delay control only through software algorithms, adapting to the wireless audio transmission needs of various scenarios such as indoor, outdoor, and industrial interference.

[0055] Example: Professional live streaming multi-camera audio synchronous transmission and low latency control

[0056] (a) Implementation of hardware platform and specific selection

[0057] This embodiment uses a 1 master-4 slave network topology. All hardware is commercially available professional live streaming audio equipment, requiring no hardware modification. The specific hardware configuration and parameters are as follows:

[0058] Main control unit (1 unit, live streaming host): equipped with an Intel i5 embedded processor, built-in WiFi 6 module (model: AX200, supports 802.11ax, bandwidth 160MHz), BLE 5.0 module (model: nRF52840, clock accuracy ±20ppm), equipped with a professional audio acquisition card, supporting 44.1kHz / 16bit~192kHz / 24bit high-fidelity audio acquisition, and running dual-mode control algorithm software;

[0059] From the terminals (4 units, 3 wireless lavalier microphones + 1 live monitoring speaker): all have the same WiFi 6 + BLE 5.0 dual-mode module built in, equipped with a 32-bit embedded audio processing chip, audio decoding has no hardware delay deviation, standby power consumption ≤5mA, and working power consumption ≤50mA;

[0060] Test instruments: high-precision audio delay tester (accuracy ±0.1ms), multi-channel synchronous oscilloscope, wireless signal analyzer, used for quantitative testing of delay, synchronization deviation and link stability.

[0061] (II) Solidification of Core Algorithm Parameters and Thresholds

[0062] The mathematical formulas and parameter thresholds are pre-programmed into the firmware of both the master and slave terminals, ensuring complete consistency between the parameters without any deviation. The specific pre-programmed parameters are as follows:

[0063] Clock skew calibration formula: Qualified threshold BLE5.0 command transmission delay Fixed at 0.2ms;

[0064] End-to-end delay calculation formula: Hardware processing latency Fixed at 3ms, control threshold ≤20ms;

[0065] Audio synchronization compensation formula: Synchronization deviation threshold ≤ 2ms;

[0066] Dual-mode switching thresholds: high bit rate ≥ 44.1kHz / 16bit, low bit rate ≤ 32kbps, switching time ≤ 5ms, delay compensation response time ≤ 3ms;

[0067] Main link anomaly threshold: WiFi 6 signal strength < -70dBm, packet loss rate > 1%, redundancy backup triggered.

[0068] (III) Detailed practical steps of the entire process

[0069] Step 1: System initialization and global clock synchronization calibration

[0070] After the master control unit and four slave terminals are powered on, they automatically complete the dual-mode module initialization. The WiFi 6 module enters standby mode, and the BLE 5.0 module starts up first. The master control unit acts as the reference clock source, broadcasting a reference clock signal every 10ms via the BLE 5.0 link. (Accuracy down to milliseconds), local clock data is immediately acquired after being received from the terminal. Substitute the values ​​into the clock deviation calibration formula to calculate:

[0071] Taking one of the microphones from the terminal as an example: , , ,but The first terminal's clock speed was ≤1ms, meeting the acceptable threshold. The other three terminals' clock speeds were 0.4ms, 0.6ms, and 0.3ms, respectively, all within acceptable limits. If a terminal's clock speed was 1.2ms (exceeding the threshold), the terminal automatically fine-tuned its local clock crystal, correcting it by 0.1ms every millisecond until the deviation was reduced to the acceptable range. The entire calibration process took ≤20ms, achieving global clock unification and eliminating cross-terminal clock deviations at their source.

[0072] Step 2: Audio bitrate determination and dynamic scheduling of dual-mode links

[0073] The main control unit collects live audio and detects in real time that the audio bitrate is 48kHz / 24bit (higher than the 44.1kHz / 16bit high-fidelity threshold). The system immediately activates a dual-mode split-processing mode: the WiFi 6 module switches to high-speed transmission mode and acts as the main link, fully responsible for the transmission of high-bitrate audio raw data, with bandwidth allocated to 80MHz and a stable transmission rate of 300Mbps; the BLE 5.0 module acts as the slave link, only transmitting clock synchronization commands, delay detection parameters, and playback control commands, without carrying audio data, thus reducing the link load.

[0074] If switched to low bitrate voice mode (bitrate 24kbps, below the 32kbps threshold), the system automatically switches to BLE5.0 single-mode transmission, the WiFi6 module enters sleep mode, the standby power consumption is reduced by 75%, and the actual time from dual-mode switching to link stabilization is 3.2ms, ≤5ms threshold, with no audio stuttering or dropouts.

[0075] Step 3: Audio data transmission and real-time latency detection

[0076] The main control unit splits the collected high-fidelity audio data into fixed-length frames (1024 bytes per frame) and marks them with a transmission timestamp. The audio frames are transmitted to four slave terminals via the WiFi 6 main link; each slave terminal marks the received timestamp after receiving the audio frame. Substituting the values ​​into the end-to-end delay calculation formula, and removing the fixed hardware processing delay of 3ms, the actual transmission delay is calculated as follows:

[0077] Actual measurement of a certain audio frame: , , ,but ≤20ms control threshold, no need to start heavy compensation.

[0078] If channel interference causes the latency to rise to 22ms (exceeding the threshold), the system immediately initiates latency lightweight optimization, automatically removes the 128-byte redundant frame header of each frame, compresses the frame length to 896 bytes, and optimizes the WiFi 6 channel to the 5.8GHz band with the least interference. The latency compensation response time is 2.8ms, quickly pulling the latency back to 16ms. The audio fidelity is lossless throughout, with no noise or distortion.

[0079] Step 4: Multi-terminal audio synchronization compensation calibration

[0080] The four terminals calculated their respective actual transmission delays. With clock deviation Then, substitute the values ​​into the audio synchronization compensation formula to calculate the actual playback trigger time for each element. Ensure all terminals are at the same global standard time. Synchronized playback:

[0081] Global standard playback time Taking a monitoring speaker terminal as an example: , ,but All from the terminal according to the calculated With early decoding, the final measured audio synchronization deviation across multiple terminals was 1.1ms, which is within the 2ms threshold. The human ear cannot perceive any synchronization difference, and there is no audio-visual misalignment or channel overlap.

[0082] Step 5: Dual-mode redundancy backup and abnormal link handling

[0083] The system monitors the WiFi 6 main link status in real time via the BLE 5.0 link, collecting signal strength and packet loss rate once per second. In this embodiment, the WiFi 6 signal strength is -52dBm and the packet loss rate is 0.2% under normal conditions, which is far below the abnormal threshold, and the main link transmission is maintained throughout the process.

[0084] In a simulated live broadcast scenario with strong interference (multiple high-power lighting devices activated), the WiFi 6 signal strength dropped to -76dBm, and the packet loss rate rose to 1.5%, triggering a redundancy backup mechanism: the BLE 5.0 link instantly took over audio transmission within 4.1ms, switching to a low bitrate compression mode for temporary audio transmission. Simultaneously, the main control unit automatically scanned and switched WiFi 6 to an idle channel. After 1.2s, the main link signal recovered to -58dBm, with a packet loss rate of 0.3%. The system seamlessly switched back to the WiFi 6 main link, ensuring uninterrupted, smooth, and synchronized audio throughout the entire process.

[0085] Step 6: Transmission End and Link Low-Power Reset

[0086] After the live audio transmission ends, the main control terminal issues a stop command, all slave terminals stop audio decoding and playback, the WiFi 6 module enters sleep mode, and only the BLE 5.0 module maintains low power standby (standby power consumption 4.8mA) and waits for the next transmission command. The power consumption optimization throughout the process meets the battery life requirements of professional equipment.

[0087] (iv) Quantitative performance testing and result verification

[0088] This embodiment uses professional instruments to complete all performance tests, and all results meet the required specifications. Specific test data is as follows:

[0089] Synchronization performance: Multi-terminal synchronization deviation ≤1.2ms, far superior to the industry standard of ≤5ms for professional live streaming;

[0090] Latency performance: The average end-to-end transmission latency is 13.8ms, and the maximum latency is 18.2ms, both of which are ≤20ms threshold.

[0091] Dual-mode stability: switching response time ≤ 4.5ms, packet loss rate 0.2%, strong anti-interference capability;

[0092] Clock synchronization: Clock deviation is stable at 0.3-0.8ms, with no clock drift;

[0093] Network performance: 4 slave terminals run synchronously, with no performance degradation during expansion, and supports expansion to a maximum of 16 terminals.

[0094] This embodiment completely solves the core pain points of existing wireless audio transmission, such as poor synchronization, high latency, and stuttering during dual-mode switching, through WiFi 6+BLE 5.0 dual-mode master-slave collaboration, quantization algorithm calibration, and closed-loop latency compensation. It requires no hardware modification, is easy to implement, and meets performance standards, fully satisfying the high-precision and low-latency requirements of various scenarios such as professional live streaming, distributed audio systems, and industrial audio control.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention.

[0096] All equivalent results made using the description and drawings of this invention within the inventive concept of this invention are subject to the following provisions.

[0097] Structural transformations, or direct / indirect applications in other related technical fields, are all included within the scope of patent protection of this invention.

Claims

1. A method for audio synchronous transmission and low-latency control based on dual-mode wireless communication, characterized in that, It is based on the hardware carrier of dual-mode wireless communication of WiFi 6 and BLE 5.0, and adopts the master-slave link dynamic division of labor mode, setting WiFi 6 as the high-speed audio data master link and BLE 5.0 as the synchronous control slave link. It includes global clock synchronization calibration, dual-mode split transmission, real-time delay detection, audio synchronization compensation, and closed-loop delay control.

2. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The global clock synchronization calibration is performed using a dedicated clock synchronization algorithm via a BLE5.0 link. The core clock deviation calibration formula is as follows: In the formula: This represents the total deviation of the terminal clock. The main control terminal reference clock, For the terminal's local clock, For BLE5.0 link clock command transmission delay; calibration rule is: when If the clock synchronization is deemed satisfactory, and exceeds the threshold, global clock unification is achieved by fine-tuning the local clock on the terminal.

3. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The dual-mode split transmission adopts dynamic link scheduling logic. When the audio bitrate is higher than the 44.1kHz / 16bit high-fidelity standard, the WiFi 6 main link is used to transmit audio data throughout, while the BLE 5.0 link only transmits synchronization and control commands. When the audio bitrate is lower than the 32kbps low-bitrate standard, it automatically switches to BLE 5.0 single-mode low-power transmission, and the WiFi 6 link goes into sleep mode to reduce power consumption. The dual-mode switching threshold can be adaptively adjusted, and the time from switching trigger to link stabilization is ≤5ms.

4. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The real-time delay detection and closed-loop delay control employ a quantitative delay calculation and active compensation mechanism. The core end-to-end delay calculation formula is as follows: In the formula: For actual end-to-end transmission delay, Send timestamps for audio data. For audio data reception timestamps, To address the latency issue in terminal hardware processing, the system sets a latency control threshold of ≤20ms. If the threshold is exceeded, latency closed-loop compensation is achieved by compressing audio frame headers and optimizing channel scheduling.

5. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The audio synchronization compensation precisely corrects playback discrepancies across multiple devices. The core audio synchronization compensation formula is: In the formula: This refers to the actual audio playback trigger time on the terminal. This is the global standard playback time.

6. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The method incorporates a dual-mode link redundancy backup mechanism. When the WiFi 6 main link is interfered with and the packet loss rate is greater than 1% or the signal strength is less than -70dBm, BLE5.0 will take over the temporary audio transmission from the link momentarily, while the main control terminal will automatically optimize the WiFi 6 channel.

7. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The multi-terminal networking supports a master-slave topology, and can accommodate up to 16 audio slave terminals in a single networking operation. All slave terminals share the global reference clock of the master control terminal, and the synchronization calibration command is broadcast. The networking expansion process does not affect the synchronization accuracy and latency performance of the existing terminals.

8. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 4, characterized in that, The closed-loop delay control is paired with lightweight audio frame optimization logic, which automatically removes redundant frame headers for high-latency channels and adopts adaptive bitrate compression. The lower the latency, the higher the bitrate priority, without compromising audio fidelity. The delay compensation response time is ≤3ms.

9. The audio synchronous transmission and low-latency control method based on dual-mode wireless communication according to claim 1, characterized in that, The method is compatible with various embedded audio terminals, wireless speakers, and live audio equipment. It does not require modification of the existing hardware structure and achieves dual-mode collaboration, synchronous calibration, and delay control only through software algorithms.

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