A control method and control system for an array loudspeaker

Abstract

This invention relates to the field of sound field control technology, specifically disclosing a control method and control system for an array loudspeaker. The method includes: analyzing sound waves within various standing wave monitoring sub-zones divided within a workshop to determine low sound pressure zones; performing type screening analysis on multiple low sound pressure zones to identify dynamic and static low sound pressure sub-zones; for dynamic low sound pressure sub-zones, real-time monitoring of their energy changes and dynamic adjustment of the array loudspeaker's output power to ensure overall sound pressure level while rationally distributing energy and avoiding excess or insufficient energy in certain areas; for static low sound pressure sub-zones, precisely adjusting the output parameters of the loudspeaker units at corresponding positions in the array loudspeaker, such as gain and phase, to appropriately reduce the gain of the loudspeaker units pointing towards the static low sound pressure sub-zone, thereby altering the superposition of sound waves in that area and specifically weakening or eliminating the standing wave effect in that area.

Description

Technical Field

[0001] This invention relates to the field of sound field control technology, specifically to a control method and control system for an array loudspeaker. Background Technology

[0002] In industrial production, such as in processing workshops, sound reinforcement systems play a crucial role in ensuring smooth production processes, effective communication among workers, and improving the quality of the working environment. These workshops are typically large spaces with complex internal structures, filled with large metal equipment and concrete pillars, and their surfaces are hard and smooth, forming strong reflective surfaces.

[0003] Due to the enclosed nature of the workshop, sound wave energy is difficult to leak out, causing reflected waves and direct waves emitted again by the array loudspeakers to easily superimpose in opposite directions, thus significantly increasing the probability of standing waves. Once formed, standing waves attenuate extremely slowly, creating low sound pressure levels in specific areas such as the angles between equipment and walls within the workshop. In these low sound pressure areas, the sound pressure level drops significantly, resulting in extremely uneven sound field distribution, severely affecting the clarity and intelligibility of speech reinforcement. Furthermore, the continuous vibrations generated by the machinery within the workshop during operation alter the position of the reflecting surfaces, causing some low sound pressure levels to dynamically change spatially. Traditional methods cannot accurately adjust the output parameters of the array loudspeakers in real time to address these dynamically changing low sound pressure levels, making it difficult to effectively solve the problem of uneven sound field distribution.

[0004] Therefore, the present invention provides a control method and control system for an array loudspeaker. Summary of the Invention

[0005] The purpose of this invention is to provide a control method and control system for an array loudspeaker to solve the aforementioned background problems.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for controlling an array loudspeaker includes:

[0008] The sound waves in each standing wave monitoring sub-area within the workshop are analyzed to determine the low sound pressure zone;

[0009] A type screening analysis was performed on multiple low sound pressure regions to identify dynamic and static low sound pressure sub-regions.

[0010] Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, and conduct coupling correlation analysis on the workshop reflector surface displacement and the low sound pressure zone displacement corresponding to the dynamic low sound pressure zone to evaluate the degree of coupling correlation between the reflector surface displacement and the dynamic low sound pressure zone displacement.

[0011] When assessing the degree of close coupling between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-region, the current dynamic low sound pressure sub-region is determined based on the current displacement of the reflector surface, and sound pressure adjustment is performed on the current dynamic low sound pressure sub-region.

[0012] As a further aspect of the present invention, the process of analyzing the sound waves in each standing wave monitoring sub-area within the workshop is as follows:

[0013] Select a standing wave monitoring sub-region as the target analysis sub-region, and obtain the standing wave monitoring sub-regions that are horizontally adjacent, vertically adjacent, or diagonally adjacent to the target analysis sub-region, as the target neighbor sub-regions;

[0014] All target neighbor sub-regions and target analysis sub-regions are merged into one target analysis region. A standing wave monitoring period is set, and the standing wave monitoring period is equally divided into several standing wave monitoring points. The sound pressure analysis value of the target neighbor sub-region at each standing wave monitoring point is obtained, and the average of the sound pressure analysis values ​​of all standing wave monitoring points is calculated to obtain the sound pressure analysis value of the target neighbor region.

[0015] If the sound pressure analysis value of the target neighboring area is less than the sound pressure threshold of the target neighboring area, it is marked as the target comparison sub-area.

[0016] As a further aspect of the present invention, the process for determining the low sound pressure region is as follows:

[0017] The proportion of the target comparison sub-region to the total number of target neighbor sub-regions is used as the target comparison sub-region ratio.

[0018] The sound pressure analysis value of the target analysis sub-region at each standing wave monitoring point is obtained, and the ratio of the sound pressure analysis value of the target neighboring region is calculated. The summation and mean are then calculated to obtain the mean sound pressure analysis value of the target.

[0019] After calculating the standard deviation of the target sound pressure analysis mean and the sound pressure analysis values ​​of all target neighboring areas, the ratio of the target sound pressure analysis mean to the sound pressure analysis values ​​of the target neighboring areas is calculated to obtain the standard deviation of the sound pressure analysis value.

[0020] The ratio of the number of target comparison sub-regions to the standard deviation of the sound pressure analysis value is calculated to obtain the low sound pressure identification value. If the low sound pressure identification value is greater than the low sound pressure identification threshold, the target analysis sub-region and the target neighboring sub-regions are merged and marked as low sound pressure areas.

[0021] As a further aspect of the present invention, the process of performing type screening analysis on multiple low sound pressure regions is as follows:

[0022] Multiple continuous low sound pressure monitoring cycles are set, and the area ratio of the low sound pressure zone to the target analysis area is obtained in each low sound pressure monitoring cycle.

[0023] The spatial variation value of low sound pressure is obtained by taking the difference between the areas of low sound pressure zones corresponding to adjacent consecutive low sound pressure monitoring cycles, taking the absolute value, and then averaging the values.

[0024] The center point of the low sound pressure area within each low sound pressure monitoring cycle is extracted, and the spatial distance between the center points of the low sound pressure areas within adjacent consecutive low sound pressure monitoring cycles is obtained. The ratio of this distance to the perimeter of the target sub-area is calculated to obtain the center offset ratio.

[0025] As a further aspect of the present invention, the screening process for the dynamic low-sound-pressure sub-region and the static low-sound-pressure sub-region is as follows:

[0026] The low sound pressure center offset value is obtained by summing and averaging all center offset ratios.

[0027] The spatial variation value of low sound pressure and the offset value of low sound pressure center are summed to obtain the type screening analysis value. If the type screening analysis value is greater than the type screening analysis threshold, the analyzed low sound pressure area is marked as a dynamic low sound pressure sub-region.

[0028] If the type screening analysis value is less than or equal to the type screening analysis threshold, the analyzed low sound pressure area is marked as a static low sound pressure sub-region.

[0029] As a further aspect of the present invention, the degree of coupling correlation between the displacement of the workshop reflector surface and the displacement of the low sound pressure region corresponding to the dynamic low sound pressure sub-region is analyzed, and the process is as follows:

[0030] The historical machine operation monitoring cycle is divided into several historical monitoring points. The center of the workshop reflective surface is extracted, and the displacement distance between the center of the workshop reflective surface and adjacent historical monitoring points is obtained. The ratio of this displacement distance to the perimeter of the workshop reflective surface is calculated to obtain the displacement of the reflective surface.

[0031] Extract the center of the dynamic low sound pressure sub-region, obtain the displacement distance between the center of the dynamic low sound pressure sub-region and adjacent historical monitoring points, and calculate the ratio with the perimeter of the dynamic low sound pressure sub-region to obtain the displacement of the low sound pressure region.

[0032] The displacement change ratio is obtained by calculating the ratio of the displacement in the low sound pressure zone to the displacement of the reflecting surface.

[0033] As a further aspect of the present invention, the evaluation process for the degree of coupling correlation between the displacement of the reflector surface and the displacement of the dynamic low-pressure sub-region is as follows:

[0034] The average displacement change is obtained by averaging all displacement change ratios.

[0035] Calculate the standard deviation of all displacement change ratios to obtain the standard deviation of displacement change;

[0036] The displacement correlation analysis value is obtained by calculating the ratio of the mean displacement change to the standard deviation of displacement change.

[0037] If the displacement correlation analysis value is less than or equal to the displacement correlation analysis threshold, it is displayed as a closely correlated signal.

[0038] As a further aspect of the present invention, the process for determining the current dynamic low acoustic pressure sub-region is as follows:

[0039] The current displacement of the reflector surface is obtained by multiplying it with the average displacement change to calculate the current dynamic low-pressure sub-region displacement.

[0040] Extract the center of the current dynamic low-pressure sub-region and combine it with the displacement of the current dynamic low-pressure sub-region to determine the location of the current dynamic low-pressure sub-region.

[0041] As a further aspect of the present invention, the process of adjusting the sound pressure of the current dynamic low sound pressure sub-region is as follows:

[0042] Extract the target neighboring area sound pressure analysis value corresponding to each standing wave monitoring sub-region within the current dynamic low sound pressure sub-region, and calculate the summation and mean to obtain the sound pressure value;

[0043] The sound pressure value is subtracted from the sound pressure threshold, and the absolute value is taken to obtain the sound pressure adjustment amount. The sound pressure adjustment operation is then performed on the current dynamic low sound pressure sub-region based on the obtained sound pressure adjustment amount.

[0044] A control system for an array loudspeaker includes:

[0045] Low sound pressure identification module: Analyzes the sound waves in each standing wave monitoring sub-zone divided within the workshop to determine the low sound pressure zone;

[0046] Low sound pressure analysis module: Performs type screening analysis on multiple low sound pressure regions, and filters out dynamic low sound pressure sub-regions and static low sound pressure sub-regions;

[0047] Coupling Correlation Assessment Module: Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, perform coupling correlation analysis on the displacement of the workshop reflector surface and the displacement of the low sound pressure zone corresponding to the dynamic low sound pressure sub-zone, and evaluate the degree of coupling correlation between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-zone.

[0048] Standing wave dynamic control module: When assessing the degree of close coupling between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-region, the current dynamic low sound pressure sub-region is determined based on the current displacement of the reflector surface, and sound pressure adjustment operation is performed on the current dynamic low sound pressure sub-region.

[0049] The beneficial effects of this invention are as follows:

[0050] 1. This invention analyzes the sound waves in various standing wave monitoring sub-zones within a workshop to identify low sound pressure zones. It then performs type screening analysis on multiple low sound pressure zones, identifying dynamic and static low sound pressure sub-zones. For dynamic low sound pressure sub-zones, its energy changes can be monitored in real time, and the output power of the array loudspeakers can be dynamically adjusted. While ensuring the overall sound pressure level, energy is rationally allocated to avoid excess or insufficient energy in certain areas. For static low sound pressure sub-zones, the output parameters of the loudspeaker units at corresponding positions in the array loudspeakers, such as gain and phase, are precisely adjusted to appropriately reduce the gain of the loudspeaker units pointing towards the static low sound pressure sub-zone, changing the superposition of sound waves in that area, thereby specifically weakening or eliminating the standing wave effect in that area.

[0051] 2. This invention extracts the displacement of the workshop reflector surface during the historical machine operation process, sets a historical machine operation monitoring cycle, and performs coupling correlation analysis on the workshop reflector surface displacement and the displacement of the low sound pressure zone corresponding to the dynamic low sound pressure sub-zone. It evaluates the degree of coupling correlation between the reflector surface displacement and the dynamic low sound pressure sub-zone displacement. When a close coupling correlation is found between the reflector surface displacement and the dynamic low sound pressure sub-zone displacement, the current dynamic low sound pressure sub-zone is determined based on the current reflector surface displacement, and sound pressure adjustment is performed on the current dynamic low sound pressure sub-zone. Adjusting the sound pressure of the dynamic low sound pressure sub-zone can change the superposition of sound waves, reduce the probability of standing wave formation, maintain the relative uniformity of the sound field in the workshop, and ensure that workers in different positions in the metallurgical plant workshop can hear appropriate sound intensity, neither feeling uncomfortable due to excessively loud sound nor unable to hear instructions due to excessively soft sound. Attached Figure Description

[0052] The invention will now be further described with reference to the accompanying drawings.

[0053] Figure 1 This is a functional block diagram of a control method and control system for an array loudspeaker according to the present invention.

[0054] Figure 2 This is a flowchart illustrating the determination process of a control method for an array loudspeaker in this invention.

[0055] Figure 3 This is a flowchart of the control system for an array loudspeaker in this invention. Detailed Implementation

[0056] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments. Example 1

[0057] In industrial enclosed workshops, such as massage chair manufacturing workshops or workshops producing array speakers for massage chairs, where multiple array speakers are needed to output high sound pressure level low-frequency signals (easily penetrating machine noise), matching the wavelength of the output low-frequency sound waves to the workshop size helps to significantly increase the standing wave probability. However, due to the presence of large metal equipment and concrete pillars, and the hard, smooth surfaces of these objects acting as strong reflectors, the sound waves emitted by the array speakers undergo multiple reflections and then superimpose with the direct waves emitted again by the multiple array speakers. Furthermore, the enclosed nature of the workshop makes it difficult for sound wave energy to escape, resulting in slow standing wave attenuation. This easily leads to low sound pressure levels in the areas where equipment and walls meet. Additionally, the vibrations from the machines operating within the workshop cause dynamic changes in the spatial location of some of these low sound pressure levels (equipment vibrations alter the position of reflective surfaces). Therefore, as... Figure 1 - Figure 2 As shown, an embodiment of the present invention provides a control method for an array loudspeaker, including:

[0058] Step 1: Analyze the sound waves in each standing wave monitoring sub-area within the workshop to determine the low sound pressure zone;

[0059] It should be noted that the standing wave monitoring sub-area is obtained by dividing the entire area of ​​the workshop into a grid, where the area of ​​each standing wave monitoring sub-area is equal.

[0060] In some embodiments, a standing wave monitoring sub-region is selected as the target analysis sub-region, and standing wave monitoring sub-regions that are spatially adjacent, vertically adjacent, or diagonally adjacent to the target analysis sub-region are obtained as target neighbor sub-regions;

[0061] All target neighboring sub-regions and target analysis sub-regions are merged into a single target analysis region, where the target analysis sub-region is located at the center of the target analysis region;

[0062] Set a standing wave monitoring period, divide the standing wave monitoring period into several standing wave monitoring points, obtain the sound pressure analysis value of the target neighboring sub-region at each standing wave monitoring point, and calculate the average of the sound pressure analysis values ​​of all standing wave monitoring points to obtain the sound pressure analysis value of the target neighboring region.

[0063] If the sound pressure analysis value of the target neighboring area is less than the sound pressure threshold of the target neighboring area, it indicates that the average amplitude of the overall sound pressure in the target neighboring sub-area is low during the standing wave monitoring period, and it is marked as the target comparison sub-area.

[0064] If the sound pressure analysis value of the target neighboring area is greater than or equal to the sound pressure threshold of the target neighboring area, it indicates that the average amplitude of the overall sound pressure in the target neighboring sub-region is high during the standing wave monitoring period, and it is marked as a non-target comparison sub-region.

[0065] The proportion of the target comparison sub-region to the total number of target neighbor sub-regions is used as the target comparison sub-region ratio.

[0066] The sound pressure analysis value of the target analysis sub-region at each standing wave monitoring point is obtained, and the ratio of the sound pressure analysis value of the target neighboring region is calculated. The summation and mean are then calculated to obtain the mean sound pressure analysis value of the target.

[0067] After calculating the standard deviation of the target sound pressure analysis mean and the sound pressure analysis values ​​of all target neighboring areas, the ratio of the target sound pressure analysis mean to the sound pressure analysis values ​​of the target neighboring areas is calculated to obtain the standard deviation of the sound pressure analysis value.

[0068] The low sound pressure identification value is obtained by calculating the ratio of the number of target comparison sub-regions to the standard deviation of the sound pressure analysis value.

[0069] It should be noted that the low sound pressure identification value represents the following: it comprehensively considers the distribution of low sound pressure areas in the surrounding areas of the target analysis sub-region (reflected by the ratio of the number of target comparison sub-regions) and the fluctuation of the sound pressure of the target analysis sub-region relative to the sound pressure of the surrounding areas (reflected by the standard deviation of the sound pressure analysis value). Specifically, if the low sound pressure identification value is larger, it indicates that there are more low sound pressure areas around the target analysis sub-region, and the sound pressure of the target analysis sub-region is significantly different and fluctuates greatly from the sound pressure of the surrounding areas. The probability that the target analysis sub-region, as well as the entire area of ​​the target's adjacent sub-regions, is a low sound pressure area is higher. If the low sound pressure identification value is smaller, it indicates that there are more low sound pressure areas around the target analysis sub-region, and the sound pressure of the target analysis sub-region is significantly different and fluctuates little from the sound pressure of the surrounding areas. The probability that the target analysis sub-region, as well as the entire area of ​​the target's adjacent sub-regions, is a low sound pressure area is lower.

[0070] If the low sound pressure recognition value is greater than the low sound pressure recognition threshold, it indicates that there are many areas with low sound pressure around the target analysis sub-region, and the sound pressure of the target analysis sub-region is significantly different from and fluctuates greatly with the sound pressure of the surrounding adjacent areas. The target analysis sub-region and the entire area of ​​the target adjacent sub-region are likely to be low sound pressure areas. The target analysis sub-region and the target adjacent sub-region are merged and marked as low sound pressure areas.

[0071] If the low sound pressure recognition value is less than or equal to the low sound pressure recognition threshold, it indicates that there are many areas with low sound pressure around the target analysis sub-region, and the sound pressure difference between the target analysis sub-region and the surrounding neighboring areas is small and the fluctuation is small. The probability that the target analysis sub-region and the entire area of ​​the target neighboring sub-region are low sound pressure areas is low. Therefore, the area after merging the target analysis sub-region and the target neighboring sub-region is marked as a non-low sound pressure area.

[0072] Step 2: Perform type screening analysis on multiple low sound pressure regions to screen out dynamic low sound pressure sub-regions and static low sound pressure sub-regions;

[0073] In some embodiments, multiple continuous low sound pressure monitoring cycles are set, and the area ratio of the low sound pressure region to the target analysis area within each low sound pressure monitoring cycle is obtained to obtain the low sound pressure region area ratio.

[0074] The spatial variation value of low sound pressure is obtained by taking the difference between the areas of low sound pressure zones corresponding to adjacent consecutive low sound pressure monitoring cycles, taking the absolute value, and then averaging the values.

[0075] Extract the center point of the low sound pressure area within each low sound pressure monitoring cycle, and obtain the spatial distance between the center points of the low sound pressure areas within adjacent consecutive low sound pressure monitoring cycles. Calculate the ratio between this distance and the perimeter of the target sub-area to obtain the center offset ratio.

[0076] The low sound pressure center offset value is obtained by summing and averaging all center offset ratios.

[0077] The spatial variation value of low sound pressure level and the center offset value of low sound pressure level are summed to obtain the type screening analysis value;

[0078] It is understandable that the type screening analysis value represents a comprehensive quantitative index used to distinguish between dynamic and static low sound pressure sub-regions. It comprehensively considers the characteristics of low sound pressure areas in terms of spatial distribution changes and positional movement. On the one hand, the low sound pressure spatial variation value reflects the degree of change in the area occupied by the low sound pressure area within the target analysis area. On the other hand, the low sound pressure center offset value reflects the degree of movement of the center point of the low sound pressure area between different monitoring cycles. Specifically, if the type screening analysis value is larger, it indicates that the low sound pressure area has greater changes and fluctuations in spatial distribution changes and positional movement. If the type screening analysis value is smaller, it indicates that the low sound pressure area has smaller changes and fluctuations in spatial distribution changes and positional movement.

[0079] If the type screening analysis value is greater than the type screening analysis threshold, it indicates that the low sound pressure area has a large change in spatial distribution and location movement, and fluctuates greatly. The low sound pressure area analyzed is marked as a dynamic low sound pressure sub-region.

[0080] If the type screening analysis value is less than or equal to the type screening analysis threshold, it indicates that the low sound pressure area has little change in spatial distribution and location movement, and the fluctuation is small. The analyzed low sound pressure area is marked as a static low sound pressure sub-region.

[0081] The specific solution in this embodiment is as follows: Analyze the sound waves in each standing wave monitoring sub-zone divided within the workshop to determine low sound pressure zones. Perform type screening analysis on multiple low sound pressure zones to identify dynamic and static low sound pressure sub-zones. For dynamic low sound pressure sub-zones, monitor their energy changes in real time and dynamically adjust the output power of the array loudspeakers. While ensuring the overall sound pressure level, rationally allocate energy to avoid excess or insufficient energy in certain areas. For static low sound pressure sub-zones, precisely adjust the output parameters of the loudspeaker units at corresponding positions in the array loudspeakers, such as gain and phase, to appropriately reduce the gain of the loudspeaker units pointing towards the static low sound pressure sub-zone, thereby changing the superposition of sound waves in that area and specifically weakening or eliminating the standing wave effect in that area. Example 2

[0082] like Figure 1 - Figure 2 As shown, an embodiment of the present invention provides a control method for an array loudspeaker, including:

[0083] Step 3: Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, and perform coupling correlation analysis on the displacement of the workshop reflector surface and the displacement of the low sound pressure zone corresponding to the dynamic low sound pressure sub-zone to evaluate the degree of coupling correlation between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-zone.

[0084] In some embodiments, the historical machine operation monitoring cycle is equally divided into several historical monitoring points, wherein the interval between adjacent historical monitoring points is equal.

[0085] Extract the center of the workshop reflector and obtain the displacement distance between the center of the workshop reflector and adjacent historical monitoring points. Calculate the ratio between the displacement distance and the perimeter of the workshop reflector to obtain the displacement of the reflector.

[0086] Extract the center of the dynamic low sound pressure sub-region, obtain the displacement distance between the center of the dynamic low sound pressure sub-region and adjacent historical monitoring points, and calculate the ratio with the perimeter of the dynamic low sound pressure sub-region to obtain the displacement of the low sound pressure region.

[0087] The displacement change ratio is obtained by calculating the ratio of the displacement in the low sound pressure zone to the displacement of the reflecting surface.

[0088] The average displacement change is obtained by averaging all displacement change ratios.

[0089] Calculate the standard deviation of all displacement change ratios to obtain the standard deviation of displacement change;

[0090] The displacement correlation analysis value is obtained by calculating the ratio of the mean displacement change to the standard deviation of displacement change.

[0091] It is understandable that the displacement correlation analysis value represents the average level and dispersion of the relative changes between the reflector displacement and the dynamic low-pressure sub-region displacement. Specifically, if the displacement correlation analysis value is small, it indicates that the relative changes between the center displacement of the dynamic low-pressure sub-region and the center displacement of the reflector are relatively significant throughout the entire monitoring period, and the relative changes within each time interval are relatively consistent with small fluctuations. This means that there is a strong and stable coupling relationship between the reflector displacement and the dynamic low-pressure sub-region displacement. If the displacement correlation analysis value is large, it indicates that the relative changes between the center displacement of the dynamic low-pressure sub-region and the center displacement of the reflector are relatively insignificant throughout the entire monitoring period, and the relative changes within each time interval are relatively inconsistent with large fluctuations. This means that there is a weak and fluctuating coupling relationship between the reflector displacement and the dynamic low-pressure sub-region displacement.

[0092] If the displacement correlation analysis value is greater than the displacement correlation analysis threshold, it indicates that the relative change between the center displacement of the dynamic low-pressure sub-region and the center displacement of the reflecting surface is not obvious overall, and there is a weak and fluctuating coupling relationship between the displacement of the reflecting surface and the displacement of the dynamic low-pressure sub-region, which is shown as a non-tightly correlated signal.

[0093] If the displacement correlation analysis value is less than or equal to the displacement correlation analysis threshold, it indicates that the relative change between the center displacement of the dynamic low-pressure sub-region and the center displacement of the reflecting surface is relatively obvious overall, and there is a strong and stable coupling relationship between the displacement of the reflecting surface and the displacement of the dynamic low-pressure sub-region, which is shown as a closely correlated signal.

[0094] Step 4: When assessing the degree of close coupling between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-region, determine the current dynamic low sound pressure sub-region based on the current displacement of the reflector surface, and perform sound pressure adjustment operation on the current dynamic low sound pressure sub-region.

[0095] In some embodiments, the current displacement of the reflector surface is obtained by multiplying the current displacement of the reflector surface with the average displacement change to calculate the current dynamic low acoustic pressure sub-region displacement.

[0096] Extract the center of the current dynamic low-pressure sub-region and combine it with the displacement of the current dynamic low-pressure sub-region to calculate and determine the position of the current dynamic low-pressure sub-region.

[0097] Extract the target neighboring area sound pressure analysis value corresponding to each standing wave monitoring sub-region within the current dynamic low sound pressure sub-region, and calculate the summation and mean to obtain the sound pressure value;

[0098] The sound pressure value is subtracted from the sound pressure threshold, and the absolute value is taken to obtain the sound pressure adjustment amount. The sound pressure adjustment operation is then performed on the current dynamic low sound pressure sub-region based on the obtained sound pressure adjustment amount.

[0099] The specific solution in this embodiment is as follows: Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, perform coupling correlation analysis on the workshop reflector surface displacement and the displacement of the low sound pressure zone corresponding to the dynamic low sound pressure sub-zone, evaluate the degree of coupling correlation between the reflector surface displacement and the dynamic low sound pressure sub-zone displacement, and when it is evaluated that there is a close coupling correlation between the reflector surface displacement and the dynamic low sound pressure sub-zone displacement, determine the current dynamic low sound pressure sub-zone based on the current reflector surface displacement, and perform sound pressure adjustment operation on the current dynamic low sound pressure sub-zone. Adjusting the sound pressure of the dynamic low sound pressure sub-zone can change the superposition of sound waves, reduce the probability of standing wave formation, maintain the relative uniformity of the sound field in the workshop, and ensure that workers in different positions in the metallurgical plant workshop can hear appropriate sound intensity, so that they will not feel uncomfortable due to excessive sound or unable to hear instructions due to insufficient sound. Example 3

[0100] Please see Figure 3 As shown, this embodiment of the invention also provides a control system for an array loudspeaker, including the following modules:

[0101] Low sound pressure identification module: Analyzes the sound waves in each standing wave monitoring sub-zone divided within the workshop to determine the low sound pressure zone;

[0102] Low sound pressure analysis module: Performs type screening analysis on multiple low sound pressure regions, and filters out dynamic low sound pressure sub-regions and static low sound pressure sub-regions;

[0103] Coupling Correlation Assessment Module: Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, perform coupling correlation analysis on the displacement of the workshop reflector surface and the displacement of the low sound pressure zone corresponding to the dynamic low sound pressure sub-zone, and evaluate the degree of coupling correlation between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-zone.

[0104] Standing wave dynamic control module: When assessing the degree of close coupling between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-region, the current dynamic low sound pressure sub-region is determined based on the current displacement of the reflector surface, and sound pressure adjustment operation is performed on the current dynamic low sound pressure sub-region.

[0105] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A control method of an array speaker, characterized by: include: The sound waves in each standing wave monitoring sub-area within the workshop are analyzed to determine the low sound pressure zone; A type screening analysis was performed on multiple low sound pressure regions to identify dynamic and static low sound pressure sub-regions. Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, and conduct coupling correlation analysis on the workshop reflector surface displacement and the low sound pressure zone displacement corresponding to the dynamic low sound pressure zone to evaluate the degree of coupling correlation between the reflector surface displacement and the dynamic low sound pressure zone displacement. When assessing the degree of close coupling between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-region, the current dynamic low sound pressure sub-region is determined based on the current displacement of the reflector surface, and sound pressure adjustment is performed on the current dynamic low sound pressure sub-region.

2. The control method of an array speaker according to claim 1, characterized in that: The process of analyzing the acoustic waves in the various standing wave monitoring sub-areas divided within the workshop is as follows: Select a standing wave monitoring sub-region as the target analysis sub-region, and obtain the standing wave monitoring sub-regions that are horizontally adjacent, vertically adjacent, or diagonally adjacent to the target analysis sub-region, as the target neighbor sub-regions; All target neighbor sub-regions and target analysis sub-regions are merged into one target analysis region. A standing wave monitoring period is set, and the standing wave monitoring period is equally divided into several standing wave monitoring points. The sound pressure analysis value of the target neighbor sub-region at each standing wave monitoring point is obtained, and the average of the sound pressure analysis values ​​of all standing wave monitoring points is calculated to obtain the sound pressure analysis value of the target neighbor region. If the sound pressure analysis value of the target neighboring area is less than the sound pressure threshold of the target neighboring area, it is marked as the target comparison sub-area.

3. The control method of an array speaker according to claim 2, characterized in that: The process for determining the low sound pressure level region is as follows: The proportion of the target comparison sub-region to the total number of target neighbor sub-regions is used as the target comparison sub-region ratio. The sound pressure analysis value of the target analysis sub-region at each standing wave monitoring point is obtained, and the ratio of the sound pressure analysis value of the target neighboring region is calculated. The summation and mean are then calculated to obtain the mean sound pressure analysis value of the target. After calculating the standard deviation of the target sound pressure analysis mean and the sound pressure analysis values ​​of all target neighboring areas, the ratio of the target sound pressure analysis mean to the sound pressure analysis values ​​of the target neighboring areas is calculated to obtain the standard deviation of the sound pressure analysis value. The ratio of the number of target comparison sub-regions to the standard deviation of the sound pressure analysis value is calculated to obtain the low sound pressure identification value. If the low sound pressure identification value is greater than the low sound pressure identification threshold, the target analysis sub-region and the target neighboring sub-regions are merged and marked as low sound pressure areas.

4. The control method for an array loudspeaker according to claim 1, characterized in that: The process of type screening analysis for multiple low sound pressure zones is as follows: Multiple continuous low sound pressure monitoring cycles are set, and the area ratio of the low sound pressure zone to the target analysis area is obtained in each low sound pressure monitoring cycle. The spatial variation value of low sound pressure is obtained by taking the difference between the areas of low sound pressure zones corresponding to adjacent consecutive low sound pressure monitoring cycles, taking the absolute value, and then averaging the values. The center point of the low sound pressure area within each low sound pressure monitoring cycle is extracted, and the spatial distance between the center points of the low sound pressure areas within adjacent consecutive low sound pressure monitoring cycles is obtained. The ratio of this distance to the perimeter of the target sub-area is calculated to obtain the center offset ratio.

5. The control method for an array loudspeaker according to claim 4, characterized in that: The screening process for dynamic and static low-pressure sub-regions is as follows: The low sound pressure center offset value is obtained by summing and averaging all center offset ratios. The spatial variation value of low sound pressure and the offset value of low sound pressure center are summed to obtain the type screening analysis value. If the type screening analysis value is greater than the type screening analysis threshold, the analyzed low sound pressure area is marked as a dynamic low sound pressure sub-region. If the type screening analysis value is less than or equal to the type screening analysis threshold, the analyzed low sound pressure area is marked as a static low sound pressure sub-region.

6. The control method for an array loudspeaker according to claim 1, characterized in that: The coupling correlation between the workshop reflector displacement and the corresponding low sound pressure region displacement in the dynamic low sound pressure sub-region is analyzed as follows: The historical machine operation monitoring cycle is divided into several historical monitoring points. The center of the workshop reflective surface is extracted, and the displacement distance between the center of the workshop reflective surface and adjacent historical monitoring points is obtained. The ratio of this displacement distance to the perimeter of the workshop reflective surface is calculated to obtain the displacement of the reflective surface. Extract the center of the dynamic low sound pressure sub-region, obtain the displacement distance between the center of the dynamic low sound pressure sub-region and adjacent historical monitoring points, and calculate the ratio with the perimeter of the dynamic low sound pressure sub-region to obtain the displacement of the low sound pressure region. The displacement change ratio is obtained by calculating the ratio of the displacement in the low sound pressure zone to the displacement of the reflecting surface.

7. The control method for an array loudspeaker according to claim 1, characterized in that: The evaluation process for the coupling correlation between the reflector displacement and the dynamic low-pressure sub-region displacement is as follows: The average displacement change is obtained by averaging all displacement change ratios. Calculate the standard deviation of all displacement change ratios to obtain the standard deviation of displacement change; The displacement correlation analysis value is obtained by calculating the ratio of the mean displacement change to the standard deviation of displacement change. If the displacement correlation analysis value is less than or equal to the displacement correlation analysis threshold, it is displayed as a closely correlated signal.

8. The control method for an array loudspeaker according to claim 1, characterized in that: The process of determining the current dynamic low sound pressure sub-region and performing sound pressure adjustment is as follows: The current displacement of the reflector surface is obtained by multiplying it with the average displacement change to calculate the current dynamic low-pressure sub-region displacement. Extract the center of the current dynamic low-pressure sub-region and combine it with the displacement of the current dynamic low-pressure sub-region to calculate and determine the position of the current dynamic low-pressure sub-region. Extract the target neighboring area sound pressure analysis value corresponding to each standing wave monitoring sub-region within the current dynamic low sound pressure sub-region, and calculate the summation and mean to obtain the sound pressure value; The sound pressure value is subtracted from the sound pressure threshold, and the absolute value is taken to obtain the sound pressure adjustment amount. The sound pressure adjustment operation is then performed on the current dynamic low sound pressure sub-region based on the obtained sound pressure adjustment amount.

9. A control system for an array loudspeaker, characterized in that: Includes the following modules: Low sound pressure level identification module: Analyzes the sound waves in each standing wave monitoring sub-zone divided within the workshop to determine the low sound pressure zone; Low sound pressure analysis module: Performs type screening analysis on multiple low sound pressure regions, and filters out dynamic low sound pressure sub-regions and static low sound pressure sub-regions; Coupling Correlation Assessment Module: Extract the displacement of the workshop reflector surface during the historical machine operation process, set the historical machine operation monitoring cycle, perform coupling correlation analysis on the displacement of the workshop reflector surface and the displacement of the low sound pressure zone corresponding to the dynamic low sound pressure sub-zone, and evaluate the degree of coupling correlation between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-zone. Standing wave dynamic control module: When assessing the degree of close coupling between the displacement of the reflector surface and the displacement of the dynamic low sound pressure sub-region, the current dynamic low sound pressure sub-region is determined based on the current displacement of the reflector surface, and sound pressure adjustment operation is performed on the current dynamic low sound pressure sub-region.

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