Anti-jamming synchronization connection control method and system for outdoor audio equipment

Abstract

The application discloses an outdoor audio equipment anti-interference synchronous connection control method and system, and relates to the wireless audio communication technical field.In the method, the master audio equipment firstly performs global scanning on the available wireless channel of the outdoor environment, performs multi-dimensional detection on indexes such as interference intensity, signal attenuation coefficient, transmission time delay and error code rate through a channel quality evaluation model, and generates a channel quality sorting table; then, the optimal initial channel is selected according to the sorting table, an initial connection is established with the slave audio equipment, and the channel interference change is monitored in real time; when it is monitored that the channel interference exceeds the standard, the adaptive frequency hopping mechanism is automatically triggered, the optimal target channel is selected in combination with the historical sorting table and real-time interference data, and the synchronous frequency hopping switching of the master and slave audio equipment is completed.The application combines channel quality quantitative evaluation and dynamic adaptive frequency hopping, effectively improves the anti-interference ability, connection stability and synchronous reliability of outdoor multi-audio equipment communication, guarantees the continuous and smooth audio playing, and is suitable for various outdoor audio playing scenes.

Description

Technical Field

[0001] This invention relates to the field of wireless audio transmission technology, and in particular to an anti-interference synchronous connection control method and system for outdoor audio equipment. Background Technology

[0002] With the increasing popularity of outdoor cultural activities, the application scenarios of outdoor audio equipment are becoming more and more widespread, placing higher demands on the connection stability, synchronization, and anti-interference capabilities of audio equipment. The outdoor environment is complex and changeable, with a large number of electromagnetic interferences (such as WiFi signals, Bluetooth devices, radiation from industrial equipment, etc.), signal obstruction (such as buildings, trees, crowds), equipment movement, and concurrent transmission of multiple devices. These issues cause traditional outdoor audio equipment to be prone to connection interruptions, audio stuttering, and asynchronous playback of multiple devices during use, seriously affecting the user experience.

[0003] Currently, existing connection control technologies for outdoor audio equipment suffer from the following shortcomings: First, they have weak anti-interference capabilities, mostly relying on fixed channel transmission, which cannot effectively avoid complex interference frequency bands outdoors. When the channel is interfered with, data packet loss and increased bit error rate are likely to occur. Second, synchronization accuracy is low, with an imperfect clock synchronization mechanism between master and slave audio devices, and the transmission delay fluctuations caused by outdoor movement and obstruction are not considered, easily leading to inconsistent playback delays among multiple devices. Third, when multiple devices transmit concurrently, signal conflicts are likely to occur, and there is a lack of effective link redundancy mechanisms. When some devices experience connection abnormalities, the entire audio system may be paralyzed. Fourth, data packet transmission reliability is insufficient, with error correction and retransmission mechanisms not optimized for complex outdoor environments, making audio interruption easily caused by interference.

[0004] For example, existing technologies using Bluetooth or WiFi for outdoor audio transmission have limitations. Bluetooth has a limited transmission distance and weak anti-interference capabilities, making it prone to connection instability when multiple devices are connected concurrently. While WiFi has a longer transmission distance, it is susceptible to interference in complex outdoor electromagnetic environments, and the synchronization accuracy of multiple devices is difficult to guarantee. Furthermore, the frequency hopping mechanisms in existing technologies are mostly fixed frequency transitions, which cannot be dynamically adjusted according to real-time channel quality, resulting in limited anti-interference effectiveness. Clock synchronization often uses simple timestamp synchronization, failing to consider outdoor latency fluctuations, and the synchronization accuracy cannot meet the requirements of high-demand audio scenarios. Data packet error correction often uses a fixed coding rate, which cannot be dynamically optimized according to channel quality, making it difficult to balance transmission efficiency and reliability. Summary of the Invention

[0005] The purpose of this invention is to propose an anti-interference synchronous connection control method for outdoor audio equipment, which aims to solve the problems of audio equipment being susceptible to interference, having unstable connections, and poor synchronization in complex outdoor environments in the prior art.

[0006] The present invention is implemented as follows: an anti-interference synchronous connection control method for outdoor audio equipment includes the following steps: The main audio device initializes and scans available wireless channels in the outdoor environment. It then uses a channel quality assessment model to perform multi-dimensional detection of the assessment indicators for each channel and generates a channel quality ranking table. The assessment indicators include, but are not limited to, interference intensity, signal attenuation coefficient, transmission delay, and bit error rate. The master audio device selects the optimal initial channel based on the channel quality ranking table, establishes an initial connection with each slave audio device, and simultaneously starts real-time interference monitoring to dynamically capture changes in interference in the current communication channel. When the current channel interference intensity is detected to exceed the preset threshold, the master audio device triggers an adaptive frequency hopping mechanism. Combining the channel quality ranking table and real-time interference data, it selects the optimal target channel to achieve synchronous frequency hopping switching between the master and slave audio devices.

[0007] In this embodiment of the invention, the method further includes the following steps: The master and slave audio devices establish a clock synchronization link. The master audio device sends a clock synchronization signal, and the slave audio device receives it and eliminates clock deviation through a clock calibration algorithm. At the same time, a dynamic buffer management strategy is adopted to adjust the audio buffer capacity of the slave audio devices in real time according to outdoor transmission delay fluctuations, so as to ensure that the playback delay of all slave audio devices is consistent.

[0008] In this embodiment of the invention, the method further includes the following steps: For outdoor multi-device concurrent scenarios, the main audio device adopts a time-division multiple access scheduling mechanism to allocate independent communication time slots to each slave audio device. At the same time, it optimizes the connection topology and automatically switches to the backup communication link when some slave audio devices experience connection failures.

[0009] Another objective of this invention is to provide an anti-interference synchronous connection control system for outdoor audio equipment.

[0010] The system includes a master audio device and at least one slave audio device, which are connected to the slave audio device via a wireless communication link. The main audio device includes: a channel scanning and evaluation module, a signal connection module, a real-time interference monitoring module, and a frequency hopping control module. The channel scanning and evaluation module is used to initialize and scan available wireless channels in the outdoor environment, collect data on interference intensity, signal attenuation, transmission delay, and bit error rate of each channel, calculate the quality score of each channel through the channel quality evaluation model, and generate a channel quality ranking table. The signal connection module is used to select the optimal initial channel based on the channel quality ranking table, establish an initial connection with each slave audio device, and simultaneously start real-time interference monitoring to dynamically capture the interference changes of the current communication channel. The real-time interference monitoring module is used to monitor the changes in interference intensity of the current communication channel in real time. When the interference intensity exceeds a preset threshold, it sends a frequency hopping trigger signal to the adaptive frequency hopping control module. The adaptive frequency hopping control module is used to receive the frequency hopping trigger signal, combine the channel quality ranking table and real-time interference data, select the optimal target channel, and realize synchronous frequency hopping switching between master and slave audio devices. The audio device includes: The wireless communication adapter module is used to receive the connection command from the main audio device and establish a wireless communication connection with the main audio device. The synchronization response module is used to receive and respond to the connection establishment command and frequency hopping switching command of the main audio device, and maintain a synchronized connection and synchronized frequency hopping with the main audio device.

[0011] Beneficial effects of the present invention This invention proposes an anti-interference synchronous connection control method and system for outdoor audio devices, relating to the field of wireless audio communication technology. In this method, the master audio device first performs a full-area scan of available wireless channels in the outdoor environment. Using a channel quality assessment model, it performs multi-dimensional detection of indicators such as interference intensity, signal attenuation coefficient, transmission delay, and bit error rate, generating a channel quality ranking table. Then, based on the ranking table, it selects the optimal initial channel to establish an initial connection with the slave audio device, while monitoring channel interference changes in real time. When channel interference exceeds the standard, an adaptive frequency hopping mechanism is automatically triggered. Combining the historical ranking table with real-time interference data, it selects the optimal target channel, completing the synchronous frequency hopping switch between the master and slave audio devices. This invention, through the combination of quantitative channel quality assessment and dynamic adaptive frequency hopping, effectively improves the anti-interference capability, connection stability, and synchronization reliability of outdoor multi-audio device communication, ensuring continuous and smooth audio playback. It is applicable to various outdoor audio playback scenarios. Attached Figure Description

[0012] Figure 1 This is a flowchart of a preferred embodiment of the anti-interference synchronous connection control method for outdoor audio equipment according to the present invention; Figure 2 This is a structural diagram of an outdoor audio equipment anti-interference synchronous connection control system according to a preferred embodiment of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. For ease of explanation, only the parts related to the embodiments of this invention are shown. It should be understood that the specific embodiments described herein are merely for explaining this invention and are not intended to limit this invention.

[0014] This invention proposes an anti-interference synchronous connection control method and system for outdoor audio devices, relating to the field of wireless audio communication technology. In this method, the master audio device first performs a full-domain scan of available wireless channels in the outdoor environment. Using a channel quality assessment model, it performs multi-dimensional detection of indicators such as interference intensity, signal attenuation coefficient, transmission delay, and bit error rate, generating a channel quality ranking table. Then, based on the ranking table, it selects the optimal initial channel to establish an initial connection with the slave audio device, and monitors channel interference changes in real time. When channel interference exceeds the standard, an adaptive frequency hopping mechanism is automatically triggered. Combining the historical ranking table with real-time interference data, it selects the optimal target channel, completing the synchronous frequency hopping switch between the master and slave audio devices. This invention, through the combination of quantitative channel quality assessment and dynamic adaptive frequency hopping, effectively improves the anti-interference capability, connection stability, and synchronization reliability of outdoor multi-audio device communication, ensuring continuous and smooth audio playback. It is applicable to various outdoor audio playback scenarios.

[0015] Figure 1 This is a flowchart of a preferred embodiment of an outdoor audio device anti-interference synchronization connection control method according to the present invention; it includes the following steps: Step S1: The main audio device initializes and scans available wireless channels in the outdoor environment. It then uses a channel quality assessment model to perform multi-dimensional testing on the evaluation indicators of each channel and generates a channel quality ranking table. In this embodiment of the invention, the evaluation metrics include: interference intensity (unit: dBm), signal attenuation coefficient (unit: dB / km), transmission delay (unit: ms), and bit error rate (unit: %). Interference intensity characterizes the degree to which the channel is affected by external electromagnetic radiation, co-channel equipment, and multipath reflection. Signal attenuation coefficient reflects the signal stability of the channel under outdoor obstruction, mobile, and long-distance transmission conditions. Transmission delay measures the transmission response speed of data packets within the channel. Bit error rate reflects the reliability of channel transmission and error correction redundancy space. Specifically, after initialization, the main audio device first activates the radio frequency channel scanning unit to perform a full-domain traversal scan of all available wireless channels in the outdoor environment. For each candidate channel, wavelet packet decomposition energy spectrum analysis, nonlinear least squares fitting algorithm combined with path loss model, bidirectional timestamp synchronization calculation, and segmented statistical algorithm based on Turbo code verification are used to independently collect and quantify four key indicators in parallel: interference intensity, signal attenuation coefficient, transmission delay, and bit error rate. After completing the indicator detection of all channels, the channel quality assessment model converts the measured physical quantities of each assessment indicator into standardized scores in a preset interval (such as the 0100 interval) according to the preset standardized mapping rules. Then, the standardized scores are weighted and summed according to the weight coefficients derived by the outdoor scene-oriented two-factor iterative calibration method to obtain a unique comprehensive channel quality score for each channel. The model sorts all available channels from high to low according to the comprehensive score, eliminates inferior channels with scores below the preset qualified threshold, and finally generates a channel quality ranking table arranged by channel quality.

[0016] The weight coefficients are derived using an outdoor scene-oriented two-factor iterative calibration method. Specifically, the scene influence factor and environment adaptation factor are determined based on the requirements of outdoor audio scenes. Then, multiple sets (e.g., 100 sets each) of comparative tests are conducted on at least two types (e.g., five types) of typical outdoor scenes. The mean values ​​of the two types of factors are calculated, and the initial weights (e.g., interference intensity 0.3, signal attenuation coefficient 0.25, transmission delay 0.25, bit error rate 0.2) are obtained through two-factor product. Finally, the weights are normalized and corrected by an iterative calibration algorithm to eliminate weight redundancy.

[0017] The interference intensity detection employs a wavelet packet decomposition-energy spectrum analysis algorithm. Specifically, the main audio device's built-in RF sampling module samples the mixed RF signals of each channel (e.g., sampling frequency set to 25MHz, sampling duration 80ms). The sampled signals undergo three-level wavelet packet decomposition. After decomposition, wavelet packet coefficients for each frequency band are extracted, and the energy value of each frequency band is calculated. Energy threshold filtering (threshold set to 1.2 times the average energy of all frequency bands) removes the frequency band energy corresponding to the communication signals of the main and slave audio devices. The sum of the remaining frequency band energy is converted into interference signal power, which is then converted into interference intensity using the formula P_dBm=10lg(P / 1mW) (where P_dBm is the converted interference intensity, unit: dBm (decibels milliwatts), and P is the interference signal power value). For example, in one embodiment of the present invention, the total interference signal power P of a certain channel is obtained through wavelet packet decomposition-energy spectrum analysis: P=1× Watts (i.e., 0.01 milliwatts), substituting into the formula, are calculated as follows: P_dBm = 10lg(0.01mW / 1mW) = 10lg =−20dBm; This channel has moderate interference, which does not exceed the preset interference threshold of -70dBm in this invention, and can be used as a candidate channel; If the calculated P_dBm=−10dBm (i.e. P=0.1mW), it indicates that the interference intensity has increased significantly, and it will be judged as an unqualified channel. Through the standardized conversion of this formula, this invention achieves a unified quantification of the interference intensity of different channels;

[0018] The signal attenuation coefficient is calculated using a nonlinear least squares fitting algorithm combined with a path loss model. For example, in one embodiment of the present invention, the specific steps are as follows: four different test distances are preset outdoors (in this embodiment, they are set to 15m, 30m, 45m, and 60m). The main audio device sends a test signal with a fixed power to the corresponding channel at each distance. After receiving the signal from the audio device, the signal strength is recorded. Based on the logarithmic distance path loss model, a fitting function y=A+10nlgx+ε is constructed (where y is the signal strength in dBm; x is the test distance in km; A is the signal strength at a distance of 1km in dBm; n is the signal attenuation coefficient in dB / km; and ε is the random error). The parameters of the fitting function are solved using the Levenberg-Marquardt algorithm, and the obtained n value is the signal attenuation coefficient of the channel. The transmission delay is calculated using a bidirectional timestamp synchronization algorithm. Specifically, the master audio device and the slave audio device complete initial time synchronization in advance. The master audio device sends a test data packet with timestamp T1 to each channel (set to 2048 bytes in this embodiment). After receiving the data packet, the slave audio device immediately embeds its own received timestamp T2 into the data packet and returns it. After receiving the response packet, the master audio device records its own received timestamp T3. The actual transmission delay of the channel is calculated using the formula t=(T2-T1+T3-T2) / 2=(T3-T1) / 2. The bit error rate (BER) is calculated using a segmented statistical algorithm based on Turbo code verification. Specifically, the main audio device continuously sends a preset number (1200 in this embodiment) of standard test data packets to each channel. Each data packet is divided into three segments, and each segment embeds an independent Turbo code verification sequence. After receiving the data packets from the audio device, each segment is verified by Turbo code decoding. If any segment fails verification, it is determined to be a bit error data packet. The number of bit error data packets N is counted, and the total number of data packets sent is M (M=1200 in this embodiment). The BER of each channel, i.e., the bit error rate ratio, is calculated using the formula BER=N / M×100%. Table 1 below shows the channel quality ranking table of an embodiment of the present invention. Table 1 Step S2: The master audio device selects the optimal initial channel based on the channel quality ranking table, establishes an initial connection with each slave audio device, and simultaneously starts real-time interference monitoring to dynamically capture changes in interference in the current communication channel. Specifically, based on the generated channel quality ranking table, the main audio device can select the channel with the highest comprehensive score and the best channel status as the initial communication channel, and broadcast an access command to the surrounding slave audio devices to be connected through a preset handshake negotiation mechanism. After receiving the access command, the slave audio devices complete authentication and parameter synchronization, and establish an initial wireless connection with the main audio device. After the connection is established, the main audio device immediately starts real-time interference monitoring, continuously collects interference data and analyzes its characteristics on the current working channel according to a preset period, captures key change information such as channel interference intensity, interference type, and interference fluctuation amplitude in real time, and dynamically compares the real-time monitoring data with the preset interference threshold to form a real-time assessment result of the channel interference status. For example, the selection of the optimal initial channel: The main audio device can choose the channel with the highest overall score and the most stable channel state as the initial channel, based on the standardized score (overall score) in the ranking table and the stability of various measured indicators. As shown in Table 1, the standardized score of channel 1 is 86.2 points, which is the highest overall score among all qualified channels (channels 1-4); at the same time, its core indicators are the best and most stable, with interference intensity of -62dBm (weakest interference), signal attenuation coefficient of 2.5dB / km (minimum attenuation), transmission delay of 15ms (shortest delay), and bit error rate of 0.6% (lowest bit error rate). All four indicators are better than other qualified channels, and the channel state is the most stable. Therefore, the main audio device preferentially selects channel 1 as the optimal initial channel to establish initial connections with each slave audio device.

[0019] Step S3: When the current channel interference intensity is detected to exceed the preset threshold, the master audio device triggers an adaptive frequency hopping mechanism. Combining the channel quality ranking table and real-time interference data, it selects a target channel (such as the target channel with the lowest interference intensity and the best transmission stability) to achieve synchronous frequency hopping switching between the master and slave audio devices. Furthermore, in this embodiment of the invention, a seamless transition strategy can be adopted during the frequency hopping switching process to avoid audio interruption; In this embodiment of the invention, the seamless connection strategy is as follows: Before frequency hopping, the master audio device presets a frequency hopping instruction data packet, embeds the frequency hopping time and target channel parameters into the instruction packet, and sends it to all slave audio devices. Upon receiving the packet, each slave audio device synchronously prepares for frequency hopping. After transmitting the last complete frame of audio data on the current channel, the master audio device immediately triggers the frequency hopping instruction, and all devices synchronously switch to the target channel. The switching delay is controlled within a preset time (e.g., 10ms). Simultaneously, the slave audio devices use local temporary buffer data to maintain playback and avoid audio stuttering. The capacity of the temporary buffer data can be set (e.g., 50ms) to ensure uninterrupted audio playback during frequency hopping.

[0020] For example, the selection of the target frequency hopping channel: When the master audio device detects that the interference intensity of the current channel (such as the initial channel 1) exceeds the preset threshold, it triggers an adaptive frequency hopping mechanism to select the target channel with the "lowest interference intensity and best transmission stability". This selection is based on the interference intensity data in the ranking table, the comprehensive score, and the stability of various indicators, while also being verified by real-time interference data. Referring to the table, after removing the inferior channel (channel 5), among the remaining qualified channels, channel 1 has the lowest interference intensity of -62dBm, followed by channel 2 with -68dBm. If the initial channel 1 exceeds the interference limit, the master audio device, based on real-time interference data, confirms that channel 1 can no longer meet the communication requirements. In this case, channel 2, with the second lowest interference intensity and best transmission stability in the ranking table, is prioritized. Channel 2 has a comprehensive score of 81.5 (second only to channel 1), a signal attenuation coefficient of 2.9dB / km, a transmission delay of 17ms, and a bit error rate of 0.8%. All indicators show small fluctuations and strong stability, and the interference intensity is significantly lower than the preset threshold. Therefore, channel 2 is selected as the target frequency hopping channel to achieve synchronous frequency hopping switching between the master and slave audio devices.

[0021] Furthermore, in this embodiment of the invention, when the master audio device transmits audio data packets to the slave audio device, Polar forward error correction coding is used to process the data packets; Furthermore, in this embodiment of the invention, while processing data packets using Polar forward error correction coding, a selective retransmission mechanism can be set to retransmit data packets that have failed to transmit or whose bit error rate exceeds the standard. In addition, the priority of data packet transmission can be optimized during the retransmission process to prioritize the transmission of audio key frames. In this embodiment of the invention, the coding rate of the Polar forward error correction coding can be dynamically adjusted according to the channel quality. Specifically, the coding rate of the Polar forward error correction coding can be dynamically adjusted according to the channel quality, and different coding rates can be adopted according to different levels of channel quality scores: when the channel quality is in the excellent range, the coding rate is set to a higher level to balance transmission efficiency and reliability; when the channel quality is in the medium range, the coding rate is set to a medium level to improve error correction capability; when the channel quality is in the poor range, the coding rate is set to a lower level to maximize error correction capability and reduce bit error rate. For example, when the channel quality score is ≥80, the coding rate is set to 1 / 2; when the channel quality score is 50 ≤ channel quality score < 80, the coding rate is set to 1 / 3; and when the channel quality score is < 50, the coding rate is set to 1 / 4.

[0022] The selective retransmission mechanism can adopt a sliding window protocol. The window size is dynamically adjusted according to the transmission delay, with an adjustment range of 8-32 data packets. The larger the transmission delay, the smaller the window size, to avoid retransmission chaos caused by window overflow. At the same time, during the retransmission process, audio key frames (such as audio frame headers and key spectrum data) can be retransmitted first to ensure the continuity of audio playback and sound quality.

[0023] Furthermore, in this embodiment of the invention, the outdoor audio equipment anti-interference synchronous connection control method further includes step S4; Step S4: The master and slave audio devices establish a clock synchronization link. The master audio device sends a clock synchronization signal, and the slave audio device receives it and eliminates clock deviation through a clock calibration algorithm. At the same time, a dynamic buffer management strategy is adopted to adjust the audio buffer capacity of the slave audio device in real time according to transmission delay fluctuations (such as delay fluctuations caused by outdoor movement or obstruction) to ensure that the playback delay of all slave audio devices is consistent. The clock calibration algorithm is as follows: after receiving the clock synchronization signal sent by the master audio device from the audio device, it calculates the deviation value between its own clock and the master audio device's clock, uses a PID algorithm to dynamically calibrate its own clock, sets the calibration period to a preset duration (e.g., 50ms), and controls the calibration accuracy within a preset high-precision range (e.g., within 1μs) to ensure clock synchronization between the master and slave audio devices.

[0024] In the dynamic buffer management strategy, the buffer capacity is adjusted within a preset range (e.g., 50-200ms). When the transmission delay fluctuation exceeds the preset fluctuation threshold (e.g., 10ms), the buffer capacity is automatically adjusted. The adjustment amount of the buffer capacity is calculated based on the delay fluctuation amplitude. If the delay increases, the buffer capacity is increased; if the delay decreases, the buffer capacity is decreased, ensuring that the amount of buffered data is always maintained within a safe threshold range (30%-70% of the buffer capacity), avoiding playback abnormalities caused by buffer overflow or empty buffer.

[0025] Furthermore, in this embodiment of the invention, the outdoor audio equipment anti-interference synchronous connection control method further includes step S5; Step S5: For outdoor multi-device concurrent scenarios, the main audio device adopts a time-division multiple access scheduling mechanism to allocate independent communication time slots to each slave audio device. At the same time, the connection topology is optimized, and when some slave audio devices experience connection abnormalities, the connection is automatically switched to the backup communication link.

[0026] In the aforementioned time-division multiple access scheduling mechanism, time slot allocation is dynamically adjusted based on the audio playback priority and data transmission volume of the audio device. The audio playback priority is preset by the user (e.g., the main speaker has a higher priority than the auxiliary speaker), and the data transmission volume is calculated based on the real-time audio bitrate (e.g., the lossless audio bitrate is higher than the normal audio bitrate, so a wider time slot is allocated). The backup communication link adopts a multi-band redundancy design. For example, the main link uses the 2.4GHz band (long transmission distance and wide coverage), and the backup link uses the 5GHz band (less interference and higher transmission rate). When the interference intensity of the main link exceeds the preset intensity value (e.g., exceeding -70dBm) or the connection is interrupted, it will automatically switch to the backup link within a preset time (e.g., 100ms). During the switching process, a seamless data packet connection technology is used. The main audio device buffers untransmitted audio data packets in real time and pushes them to the backup link synchronously during the switch. The audio device can quickly complete the access and parameter synchronization without re-establishing the connection or interrupting the transmission, ensuring no stuttering or audio dropouts and without affecting the continuity of audio playback.

[0027] Corresponding to the anti-interference synchronous connection control method for outdoor audio equipment described in the above embodiments, Figure 2 This diagram illustrates a structural block diagram of an outdoor audio equipment anti-interference synchronous connection control system according to an embodiment of this application. For ease of explanation, only the parts related to the embodiment of this application are shown.

[0028] The system includes a master audio device and at least one slave audio device, which are connected to the slave audio device via a wireless communication link. The master audio device initializes and scans available wireless channels in the outdoor environment. It performs multi-dimensional detection of evaluation indicators for each channel using a channel quality assessment model, generating a channel quality ranking table. Based on this ranking table, it selects the optimal initial channel, establishes initial connections with each slave audio device, and simultaneously initiates real-time interference monitoring to dynamically capture changes in interference on the current communication channel. When the detected channel interference intensity exceeds a preset threshold, the master audio device triggers an adaptive frequency hopping mechanism. Combining the channel quality ranking table and real-time interference data, it selects the optimal target channel, achieving synchronous frequency hopping switching between the master and slave audio devices. The evaluation indicators include, but are not limited to, interference intensity, signal attenuation coefficient, transmission delay, and bit error rate. The system includes: a channel scanning and evaluation module, a signal connection module, a real-time interference monitoring module, and a frequency hopping control module. The channel scanning and evaluation module is used to initialize and scan available wireless channels in the outdoor environment, collect data on interference intensity, signal attenuation, transmission delay, and bit error rate of each channel, calculate the quality score of each channel through the channel quality evaluation model, and generate a channel quality ranking table. The signal connection module is used to select the optimal initial channel based on the channel quality ranking table, establish an initial connection with each slave audio device, and simultaneously start real-time interference monitoring to dynamically capture the interference changes of the current communication channel. The real-time interference monitoring module is used to monitor the changes in interference intensity of the current communication channel in real time. When the interference intensity exceeds a preset threshold, it sends a frequency hopping trigger signal to the adaptive frequency hopping control module. The adaptive frequency hopping control module is used to receive the frequency hopping trigger signal, combine the channel quality ranking table and real-time interference data, select the optimal target channel, and realize synchronous frequency hopping switching between master and slave audio devices. The slave audio device is configured to establish a wireless communication connection with the master audio device, receive and respond to connection establishment instructions and frequency hopping switching instructions from the master audio device, and maintain a synchronous connection and synchronous frequency hopping with the master audio device; including: The wireless communication adapter module is used to receive the connection command from the main audio device and establish a wireless communication connection with the main audio device. The synchronization response module is used to receive and respond to the connection establishment command and frequency hopping switching command of the main audio device, and maintain a synchronized connection and synchronized frequency hopping with the main audio device.

[0029] Furthermore, the master audio device is also used to establish a clock synchronization link between the master and slave audio devices and send a clock synchronization signal; it adopts a dynamic buffer management strategy to adjust the audio buffer capacity of the slave audio devices in real time according to outdoor transmission delay fluctuations, ensuring consistent playback delay across all slave audio devices; including: The clock synchronization transmission module is used to establish a clock synchronization link between the master and slave audio devices and send clock synchronization signals. The dynamic buffer management module is used to adopt a dynamic buffer management strategy to adjust the audio buffer capacity of the audio devices in real time according to the outdoor transmission latency fluctuations, so as to ensure that the playback latency of all audio devices is consistent. The slave audio device is further configured to receive a clock synchronization signal sent by the master audio device, and eliminate clock deviation between itself and the master audio device through a clock calibration algorithm; receive a buffer capacity adjustment command issued by the master audio device based on a dynamic buffer management strategy, and adjust its own audio buffer capacity in real time to ensure consistent playback latency with other slave audio devices; including: The clock synchronization receiving and calibration module is used to receive the clock synchronization signal sent by the main audio device and eliminate the clock deviation between itself and the main audio device through a clock calibration algorithm. The buffer capacity adjustment module is used to receive buffer capacity adjustment instructions issued by the main audio device based on the dynamic buffer management strategy, and adjust its own audio buffer capacity in real time to ensure that the playback latency is consistent with that of other slave audio devices. Furthermore, the main audio device also includes a time-division multiple access scheduling module, which is used to allocate independent communication time slots to each slave audio device in outdoor multi-device concurrent scenarios, optimize the connection topology, and automatically switch to the backup communication link when some slave audio devices experience connection abnormalities. The slave audio device also includes a topology optimization and backup communication link switching module, which is used to receive independent communication time slots allocated by the master audio device, cooperate with the master audio device to complete connection topology optimization and backup communication link switching, and maintain a stable connection.

[0030] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by program instructions and related hardware. The program can be stored in a computer-readable storage medium, such as ROM, RAM, disk, optical disk, etc.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for anti-interference synchronous connection control of outdoor audio equipment, characterized in that, The method includes: The main audio device initializes and scans available wireless channels in the outdoor environment. It then uses a channel quality assessment model to perform multi-dimensional detection of the assessment indicators for each channel and generates a channel quality ranking table. The assessment indicators include, but are not limited to, interference intensity, signal attenuation coefficient, transmission delay, and bit error rate. The master audio device selects the optimal initial channel based on the channel quality ranking table, establishes an initial connection with each slave audio device, and simultaneously starts real-time interference monitoring to dynamically capture changes in interference in the current communication channel. When the current channel interference intensity is detected to exceed the preset threshold, the master audio device triggers an adaptive frequency hopping mechanism. Combining the channel quality ranking table and real-time interference data, it selects the optimal target channel to achieve synchronous frequency hopping switching between the master and slave audio devices.

2. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 1, characterized in that, The method also Includes the following steps, The master and slave audio devices establish a clock synchronization link. The master audio device sends a clock synchronization signal, and the slave audio device receives it and eliminates clock deviation through a clock calibration algorithm. At the same time, a dynamic buffer management strategy is adopted to adjust the audio buffer capacity of the slave audio devices in real time according to outdoor transmission delay fluctuations, so as to ensure that the playback delay of all slave audio devices is consistent.

3. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 2, characterized in that, The method also Includes the following steps, For outdoor multi-device concurrent scenarios, the main audio device adopts a time-division multiple access scheduling mechanism to allocate independent communication time slots to each slave audio device. At the same time, it optimizes the connection topology and automatically switches to the backup communication link when some slave audio devices experience connection failures.

4. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 3, characterized in that, The interference intensity detection uses a wavelet packet decomposition-energy spectrum analysis algorithm; The signal attenuation coefficient is calculated using a nonlinear least squares fitting algorithm combined with a path loss model. The transmission delay is calculated using a two-way timestamp synchronization algorithm. The bit error rate is calculated using a segmented statistical algorithm based on Turbo code verification.

5. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 4, characterized in that, The process for generating the channel quality ranking table is as follows: After completing the index detection of all channels, the channel quality assessment model converts the measured physical quantities of each assessment index into standardized scores within a preset range according to the preset standardized mapping rules. Then, based on the weight coefficients derived through the outdoor scenario-oriented two-factor iterative calibration method, the standardized scores of each item are weighted and summed to obtain a unique comprehensive channel quality score for each channel. The model sorts all available channels from high to low according to the comprehensive score, removes inferior channels with scores below the preset qualified threshold, and finally generates a channel quality ranking table arranged according to the channel quality.

6. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 5, characterized in that, The weight coefficients are derived using an outdoor scene-oriented two-factor iterative calibration method. Specifically, the scene influence factor and environment adaptation factor are determined based on the needs of outdoor audio scenes. Then, through multiple sets of comparative tests in at least two typical outdoor scenes, the mean values ​​of the two types of factors are calculated and the initial weights are obtained through the two-factor product. Finally, the weights are normalized and corrected by the iterative calibration algorithm to eliminate weight redundancy.

7. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 1, characterized in that, The frequency hopping switching process employs a seamless transition strategy to avoid audio interruption; The seamless connection strategy is as follows: Before frequency hopping, the master audio device presets a frequency hopping instruction data packet, embeds the frequency hopping time and target channel parameters into the instruction packet, and sends it to all slave audio devices. After receiving the packet, each slave audio device synchronously prepares for frequency hopping. After the master audio device transmits the last frame of complete audio data on the current channel, it immediately triggers the frequency hopping instruction. All devices synchronously switch to the target channel, and the switching delay is controlled within a preset time. At the same time, the slave audio devices use local temporary buffer data to maintain playback and avoid audio stuttering.

8. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 1, characterized in that, The method further includes: When the master audio device transmits audio data packets to the slave audio device, Polar forward error correction coding is used to process the data packets; The coding rate of the Polar forward error correction coding is dynamically adjusted according to the channel quality.

9. The anti-interference synchronous connection control method for outdoor audio equipment as described in claim 2, characterized in that, The clock calibration algorithm is as follows: after receiving the clock synchronization signal sent by the master audio device from the audio device, the deviation value between its own clock and the master audio device clock is calculated, and the PID algorithm is used to dynamically calibrate its own clock. The calibration period is set to a preset duration, and the calibration accuracy is controlled within a preset high-precision range to ensure clock synchronization between the master and slave audio devices. In the dynamic buffer management strategy, the buffer capacity is adjusted within a preset range. When the transmission delay fluctuation exceeds the preset fluctuation threshold, the buffer capacity is automatically adjusted. The adjustment amount of the buffer capacity is calculated based on the latency fluctuation range.

10. An anti-interference synchronous connection control system for outdoor audio equipment, characterized in that, The system includes: The system includes a master audio device and at least one slave audio device, which are connected to the slave audio device via a wireless communication link. The main audio device includes: a channel scanning and evaluation module, a signal connection module, a real-time interference monitoring module, and a frequency hopping control module. The channel scanning and evaluation module is used to initialize and scan available wireless channels in the outdoor environment, collect data on interference intensity, signal attenuation, transmission delay, and bit error rate of each channel, calculate the quality score of each channel through the channel quality evaluation model, and generate a channel quality ranking table. The signal connection module is used to select the optimal initial channel based on the channel quality ranking table, establish an initial connection with each slave audio device, and simultaneously start real-time interference monitoring to dynamically capture the interference changes of the current communication channel. The real-time interference monitoring module is used to monitor the changes in interference intensity of the current communication channel in real time. When the interference intensity exceeds a preset threshold, it sends a frequency hopping trigger signal to the adaptive frequency hopping control module. The adaptive frequency hopping control module is used to receive the frequency hopping trigger signal, combine the channel quality ranking table and real-time interference data, select the optimal target channel, and realize synchronous frequency hopping switching between master and slave audio devices. The audio device includes: The wireless communication adapter module is used to receive the connection command from the main audio device and establish a wireless communication connection with the main audio device. The synchronization response module is used to receive and respond to the connection establishment command and frequency hopping switching command of the main audio device, and maintain a synchronized connection and synchronized frequency hopping with the main audio device.

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