Sound sound field calibration optimization system

Abstract

The invention discloses a sound equipment sound field calibration optimization system, and relates to the technical field of electric digital data processing, the sound equipment sound field calibration optimization system comprises an input module, a processing module, an adjusting module and an output module, the input module is used for receiving an audio signal, transmitting the audio signal to the processing module, converting a volume alternating current signal in the audio signal into a direct current signal, obtaining a voltage change parameter, and outputting the voltage change parameter; the method comprises the following steps: receiving an audio signal, outputting a voltage amplitude parameter, transmitting the voltage amplitude parameter to an adjusting module, outputting a corresponding adjusting control signal by identifying the voltage amplitude parameter, dynamically adjusting the adjusting control signal, adjusting a corresponding frequency band of the audio signal according to the adjusting control signal, transmitting the adjusting control signal to an output module, outputting the adjusted audio signal, and accurately adjusting the audio signal. Smooth transition of a low frequency band, a middle frequency band and a high frequency band is achieved, sound quality abrupt change is avoided, energy is dynamically balanced, multiple scenes are adapted, real-time adjustment and automatic calibration are carried out through closed-loop feedback to cope with the aging condition of sound equipment, overload protection is achieved, and calibration quality and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic digital data processing, and in particular to an acoustic sound field calibration and optimization system. Background Art

[0002] In recent years, the sound field calibration and optimization of audio equipment has become a key research direction in the field of audio technology. With the popularization of consumer electronics and people's pursuit of high-quality audio experience, users have put forward higher requirements for the sound quality refinement, spatial layering and environmental adaptability of audio equipment. From the immersive sound field of home theaters to the complex environment noise reduction of car audio, from the far-field pickup optimization of smart speakers to the precise positioning of professional stage audio, the audio playback needs in different scenarios are showing a diversified and personalized trend.

[0003] Current traditional audio sound field calibration and optimization technologies have many shortcomings. First, most of them use fixed audio processing modes, which are difficult to dynamically adjust according to the real-time characteristics of the audio signal. For example, when faced with audio content of different volumes, it is impossible to accurately adjust each frequency band in a targeted manner, resulting in the bass not being clear enough at a low volume, and the treble being easily harsh at a high volume. Second, traditional technologies lack an effective frequency band correlation adjustment mechanism. When adjusting a certain frequency band, the energy changes in adjacent frequency bands are often ignored, thereby destroying the overall energy balance of the audio signal and making the sound quality sound unnatural and smooth. Third, when dealing with overload conditions, a simple and crude method is usually used to directly limit the volume, which will cause audio signal distortion and affect the user's listening experience. In addition, traditional technologies are also difficult to adapt to the impact of environmental changes and equipment aging. With the increase in usage time and changes in the environment, the sound quality of audio equipment will gradually decline and cannot be automatically calibrated and optimized. Summary of the Invention

[0004] The technical problem solved by the present invention is: the current traditional audio sound field calibration and optimization technology has many deficiencies. First, most of them adopt a fixed audio processing mode, which is difficult to dynamically adjust according to the real-time characteristics of the audio signal. For example, when faced with audio content of different volumes, it is impossible to accurately adjust each frequency band in a targeted manner, resulting in the bass not being clear enough at a low volume, and the treble being easily harsh at a high volume. Second, traditional technology lacks an effective frequency band correlation adjustment mechanism. When adjusting a certain frequency band, the energy changes of adjacent frequency bands are often ignored, thereby destroying the overall energy balance of the audio signal, making the sound quality sound unnatural and smooth. Third, when dealing with overload conditions, a simple and crude method is usually used to directly limit the volume, which will cause audio signal distortion and affect the user's listening experience. In addition, traditional technology is also difficult to adapt to the impact of environmental changes and equipment aging. With the increase in usage time and changes in the environment, the sound quality of the audio equipment will gradually decline and cannot be automatically calibrated and optimized.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an acoustic sound field calibration and optimization system, comprising an input module, a processing module, an adjustment module and an output module; The input module is used to receive the audio signal and transmit it to the processing module; The processing module is used to convert the volume AC signal in the audio signal into a DC signal, obtain a voltage change parameter, and output a voltage amplitude parameter to transmit to the adjustment module; The adjustment module outputs a corresponding adjustment control signal by identifying the voltage amplitude parameter, dynamically adjusts the adjustment control signal, adjusts the corresponding frequency band of the audio signal according to the adjustment control signal, and transmits the adjusted signal to the output module; The output module is used to output the adjusted audio signal. As a preferred solution of the sound field calibration and optimization system of the present invention, wherein: the DC signal is obtained by converting the volume AC signal through a diode; The processing module has a built-in analog-to-digital conversion module for converting the voltage change parameter of the DC signal into a digital signal; Identify the corresponding sound amplitude value according to the digital signal to obtain a voltage amplitude parameter; The dynamic adjustment process is a linear change adjustment; At the switching boundary of different intervals of the voltage amplitude parameter, the first target frequency band adjustment amount transitions linearly; The first target frequency band corresponds to a low frequency band; The adjustment control signal includes a first adjustment control signal and a second adjustment control signal; The corresponding frequency bands include a first target frequency band, a second target frequency band, and a third target frequency band.

[0006] As a preferred solution of the sound field calibration and optimization system of the present invention, wherein: the adjustment module includes a dynamic adjustment unit, a digital signal processor, a frequency band correlation adjustment unit and an adjustment effect evaluation unit; The dynamic adjustment unit includes: When the volume corresponding to the voltage amplitude parameter is below a preset first threshold: The ratio of the first adjustment control signal to increase the first target frequency band is within a first preset range; The boost ratio increases linearly as the voltage amplitude parameter decreases; When the volume corresponding to the voltage amplitude parameter exceeds a preset second threshold: The attenuation ratio of the first adjustment control signal to the second target frequency band is within a second preset range; The attenuation ratio increases linearly as the voltage amplitude parameter increases; The ratio of the first adjustment control signal to increase the third target frequency band is within a third preset range; The boost ratio increases linearly with the increase of the voltage amplitude parameter; When the volume corresponding to the voltage amplitude parameter is between a preset first threshold and a preset second threshold: The adjustment amounts of the first target frequency band, the second target frequency band, and the third target frequency band by the first adjustment control signal are linearly interpolated according to preset calibration parameters to achieve smooth transition; The second target frequency band corresponds to a mid-frequency band; The third target frequency band corresponds to a high frequency band; The dynamic correction curve of the volume interval boundary is fitted by n sets of historical adjustment data, so that the preset first threshold and the preset second threshold are automatically calibrated according to the aging of the audio equipment or the environmental changes.

[0007] As a preferred solution of the sound field calibration and optimization system of the present invention, a fixed execution order is set among the dynamic adjustment unit, digital signal processor, frequency band association adjustment unit and adjustment effect evaluation unit of the adjustment module, specifically including: The digital signal processor preferentially completes initialization configuration of a volume range-frequency band adjustment mapping table; The dynamic adjustment unit performs a main adjustment operation based on the mapping table after initialization configuration to generate a first adjustment control signal; The frequency band association adjustment unit receives the first adjustment control signal, performs compensation adjustment on adjacent frequency bands, and generates a second adjustment control signal; The adjustment effect evaluation unit receives the audio signal adjusted by the second adjustment control signal and performs real-time monitoring to generate a correction instruction; The correction instruction takes effect in the next complete adjustment cycle; Setting a conflict resolution mechanism for the adjustment module specifically includes: When a first adjustment control signal generated by the dynamic adjustment unit conflicts with a second adjustment control signal generated by the frequency band association adjustment unit regarding the gain adjustment amount of the same frequency band, the first adjustment control signal is executed first; The compensation adjustment of the frequency band association adjustment unit is adjusted based on the gain of the first adjustment control signal; Setting an overload protection priority channel for the regulation module specifically includes: When it is detected that the peak voltage exceeds the safety threshold, all current regulation operations are immediately interrupted, and the overload protection regulation is triggered and executed first until the peak voltage reaches the safe range; During the overload protection period, the first adjustment control signal generated by the dynamic adjustment unit and the second adjustment control signal generated by the frequency band association adjustment unit are temporarily suspended; The correction mechanism of the adjustment effect evaluation unit sets the execution delay, specifically including: The correction instruction generated by the evaluation unit takes effect after no less than y complete adjustment cycles; The correction instruction needs to be verified for validity by a digital signal processor before it takes effect, and instructions that fail the verification will automatically become invalid.

[0008] As a preferred solution of the sound field calibration and optimization system of the present invention, wherein: the volume interval-frequency band adjustment mapping table is configured based on a preset threshold interval; The threshold interval includes a preset first threshold and a preset second threshold; The digital signal processor has a built-in preset volume range-frequency band adjustment mapping table for matching the corresponding first adjustment control signal according to the voltage amplitude parameter; The corresponding relationship between the adjustment amount and the voltage amplitude parameter of the first target frequency band, the second target frequency band and the third target frequency band conforms to the linear increase or attenuation logic.

[0009] As a preferred solution of the sound field calibration and optimization system of the present invention, the frequency band correlation adjustment unit is configured to perform correlation adjustment according to energy changes of adjacent frequency bands when independently adjusting the first target frequency band, the second target frequency band, or the third target frequency band; When the first adjustment control signal performs an attenuation operation on the second target frequency band, the frequency band association adjustment unit measures the energy attenuation amount of the second target frequency band in real time; and compensatingly improving the gains of the first target frequency band and the third target frequency band according to a preset proportional coefficient; The proportional coefficient is inversely proportional to the distance between the center frequencies of adjacent frequency bands, and is used to maintain the overall energy balance of the adjusted audio signal.

[0010] As a preferred solution of the sound field calibration and optimization system of the present invention, the adjustment effect evaluation unit is used to perform real-time effect evaluation and parameter correction on the adjusted audio signal; The adjustment effect evaluation unit determines whether the adjustment effect meets the preset optimization target by calculating the characteristic index of the audio signal before and after adjustment; The characteristic indicators include spectrum similarity and energy distribution uniformity; If the evaluation result indicates that over-regulation or under-regulation occurs, the regulation effect evaluation unit generates a parameter correction signal; The gain coefficient in the regulation control signal is dynamically adjusted within a preset range to build a closed-loop feedback control mechanism for the regulation parameters.

[0011] As a preferred solution of the sound field calibration and optimization system of the present invention, wherein: the closed-loop feedback control mechanism includes parameter correction signal generation and dynamic gain adjustment; When the adjustment effect evaluation unit determines that there is over-adjustment or under-adjustment, the parameter correction signal generates a correction instruction in the corresponding direction; After receiving the correction instruction, the dynamic gain adjustment performs a gradient adjustment within a preset range on the gain coefficient in the adjustment control signal; The gradient adjustment step size is positively correlated with the evaluation deviation amplitude until the adjustment effect meets the preset optimization target.

[0012] As a preferred solution of the sound field calibration and optimization system of the present invention, a bidirectional feedback control channel is set between the adjustment module and the processing module, specifically including: The processing module monitors the peak voltage of the regulated audio signal in real time and generates an overload warning signal; When the regulating module receives an overload signal, it triggers the dynamic compression mechanism of the overload protection priority channel, specifically including: Implementing a step-by-step attenuation adjustment on the gain of the first target frequency band, the second target frequency band, or the third target frequency band through the overload protection priority channel within a set time until the peak voltage reaches a preset safety range; The dynamic compression mechanism includes an overload detection trigger unit and a frequency band gain gradient adjustment unit; The overload detection trigger unit generates an overload warning signal and transmits it to the regulation module when the processing module detects that the peak voltage of the regulated audio signal exceeds a safety threshold; After receiving the overload warning signal, the frequency band gain gradient adjustment unit implements a stepped attenuation adjustment on the gain of the first target frequency band, the second target frequency band or the third target frequency band that triggers the overload within a set time range until the peak voltage falls back to a preset safety range.

[0013] As a preferred solution of the sound field calibration and optimization system of the present invention, wherein: the processing module and the adjustment module are connected via a universal input and output interface; The voltage amplitude parameter is output to the adjustment module through the input and output interface.

[0014] The beneficial effects of the present invention: through precise adjustment capabilities, the audio signal is processed in detail to achieve smooth transitions between low-frequency bands, mid-frequency bands and high-frequency bands, effectively avoiding sudden changes in sound quality, and bringing users a natural, smooth and layered auditory feast. The signal energy balance is dynamically maintained according to the audio characteristics. Whether it is soothing classical music or passionate rock music, the sound comfort can be improved to the best, and it can be easily adapted to a variety of audio scenes. Its powerful adaptive optimization function monitors and adjusts in real time through a closed-loop feedback mechanism to ensure that each adjustment can accurately meet the expected effect. In the face of complex situations such as aging of audio equipment and environmental changes, the preset threshold can be automatically calibrated to always maintain an efficient operating state. In addition, the thoughtful overload protection mechanism provides a solid guarantee for the safe and stable operation of audio equipment, and comprehensively improves the quality and reliability of audio sound field calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the basic flow of an acoustic sound field calibration and optimization system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0017] Example, see Figure 1 , as an embodiment of the present invention, provides an acoustic sound field calibration and optimization system, including an input module, a processing module, an adjustment module and an output module; An input module, configured to receive audio signals and transmit them to a processing module; The processing module is used to convert the volume AC signal in the audio signal into a DC signal, obtain the voltage change parameter, and output the voltage amplitude parameter to transmit to the adjustment module; The adjustment module outputs a corresponding adjustment control signal by identifying the voltage amplitude parameter, dynamically adjusts the adjustment control signal, adjusts the corresponding frequency band of the audio signal according to the adjustment control signal, and transmits it to the output module; The output module is used to output the regulated audio signal. In one embodiment, a complete sound field calibration and optimization link is formed by an input module, a processing module, an adjustment module and an output module. The input module serves as a signal input, is responsible for receiving external audio signals, and transmitting them to the processing module without loss; the processing module performs core processing on the input audio signal, converts the volume AC signal into a DC signal, accurately extracts the voltage change parameters and converts them into voltage amplitude parameters, providing a key basis for subsequent adjustment; the adjustment module receives the voltage amplitude parameters from the processing module, outputs the corresponding adjustment control signal through a built-in algorithm, and dynamically optimizes the signal to accurately adjust the low-frequency, mid-frequency and high-frequency performance of the audio signal. The audio signal optimized by the adjustment module is stably output to the audio equipment by the output module, realizing the full-process automated processing of sound field calibration and sound quality optimization.

[0018] The DC signal is converted into the volume AC signal through a diode; The processing module has a built-in analog-to-digital conversion module for converting the voltage change parameters of the DC signal into a digital signal; Identify the corresponding sound amplitude value according to the digital signal and obtain the voltage amplitude parameter; The dynamic adjustment process is linear change adjustment; At the switching boundary of different intervals of the voltage amplitude parameter, the adjustment amount of the first target frequency band transitions linearly; The first target frequency band corresponds to the low frequency band; The adjustment control signal includes a first adjustment control signal and a second adjustment control signal; The corresponding frequency bands include a first target frequency band, a second target frequency band, and a third target frequency band.

[0019] In one embodiment, the processing module converts the volume AC signal in the input audio signal into a DC signal through a diode, and the built-in analog-to-digital conversion module further converts the voltage change parameter of the DC signal into a digital signal. After identification and processing, the voltage amplitude parameter is generated and transmitted to the adjustment module. The adjustment module adopts a linear change adjustment mechanism. For the low frequency band (first target frequency band), a linear transition of the adjustment amount is implemented at the switching boundary of different intervals of the voltage amplitude parameter to ensure smooth frequency band connection. The adjustment control signal is divided into a first adjustment control signal and a second adjustment control signal, corresponding to the target frequency bands of the low frequency band, the mid-frequency band and the high frequency band (the first target frequency band, the second target frequency band and the third target frequency band). By identifying the voltage amplitude parameter, targeted adjustment instructions are output to achieve precise control of each frequency band.

[0020] The adjustment module includes a dynamic adjustment unit, a digital signal processor, a frequency band correlation adjustment unit and an adjustment effect evaluation unit; The dynamic adjustment unit includes: When the volume corresponding to the voltage amplitude parameter is below the preset first threshold: The ratio of the first adjustment control signal to increase the first target frequency band is within a first preset range; The boost ratio increases linearly as the voltage amplitude parameter decreases; When the volume corresponding to the voltage amplitude parameter exceeds the preset second threshold: The attenuation ratio of the first adjustment control signal to the second target frequency band is within a second preset range; The attenuation ratio increases linearly with the increase of the voltage amplitude parameter; The ratio of the first adjustment control signal to increase the third target frequency band is within a third preset range; The boost ratio increases linearly with the increase of voltage amplitude parameter; When the volume corresponding to the voltage amplitude parameter is between the preset first threshold and the preset second threshold: The first adjustment control signal performs linear interpolation on the adjustment amounts of the first target frequency band, the second target frequency band, and the third target frequency band according to preset calibration parameters to achieve smooth transition; The second target frequency band corresponds to the mid-frequency band; The third target frequency band corresponds to the high frequency band; A dynamic correction curve of the volume interval boundary is fitted by n sets of historical adjustment data, so that the preset first threshold and the preset second threshold are automatically calibrated according to the aging of the audio equipment or the environmental changes.

[0021] In one embodiment, the adjustment module is composed of a dynamic adjustment unit, a digital signal processor, a frequency band association adjustment unit and an adjustment effect evaluation unit working together, and adopts a linear change adjustment mechanism, wherein the first target frequency band corresponds to the low frequency band (such as the frequency band where 50Hz is located), the second target frequency band corresponds to the mid-frequency band, and the third target frequency band corresponds to the high frequency band. The first threshold is preset to correspond to 1 / 3 of the volume, and the second threshold is preset to correspond to 2 / 3 of the volume. This setting is based on the study of conventional audio volume distribution and listening comfort. When the volume is lower than 1 / 3, the first adjustment control signal increases the first target frequency band by 10%-30%, and as the volume decreases, the first adjustment control signal increases the first target frequency band by 10%-30%. Increase linearly; when the volume is in the range of 1 / 3-2 / 3, each frequency band remains unchanged; when the volume exceeds 2 / 3, the first target frequency band is attenuated by 10%-25%, and the third target frequency band (such as the 100Hz band) is increased by 15%-30%. The adjustment amount is smoothly transitioned through linear interpolation at the threshold boundary, and 50 (n=50) groups of historical adjustment data are used to fit the dynamic correction curve to achieve automatic calibration of the threshold as the audio equipment ages or the environment changes. The adjustment control signal outputs targeted instructions for the first target frequency band, the second target frequency band, and the third target frequency band by identifying the voltage amplitude parameter to achieve precise adjustment.

[0022] A fixed execution order is set between the dynamic adjustment unit, digital signal processor, frequency band association adjustment unit, and adjustment effect evaluation unit of the adjustment module, specifically including: The digital signal processor first completes the initialization configuration of the volume range-frequency band adjustment mapping table; The dynamic adjustment unit performs a main adjustment operation based on the mapping table after initialization configuration to generate a first adjustment control signal; The frequency band association adjustment unit receives the first adjustment control signal and performs compensation adjustment on the adjacent frequency band to generate a second adjustment control signal; The adjustment effect evaluation unit receives the audio signal adjusted by the second adjustment control signal and performs real-time monitoring to generate a correction instruction; The revised order will take effect in the next complete adjustment cycle; Set up a conflict resolution mechanism for the adjustment module, including: When a first adjustment control signal generated by the dynamic adjustment unit conflicts with a second adjustment control signal generated by the frequency band association adjustment unit regarding the gain adjustment amount of the same frequency band, the first adjustment control signal is executed first; The compensation adjustment of the frequency band association adjustment unit is adjusted based on the gain of the first adjustment control signal; Set the overload protection priority channel for the regulation module, including: When it is detected that the peak voltage exceeds the safety threshold, all current regulation operations are immediately interrupted, and the overload protection regulation is triggered and executed first until the peak voltage reaches the safe range; During the overload protection period, the first adjustment control signal generated by the dynamic adjustment unit and the second adjustment control signal generated by the frequency band association adjustment unit are temporarily suspended; The correction mechanism of the adjustment effect evaluation unit sets the execution delay, including: The correction instruction generated by the evaluation unit takes effect after no less than y complete adjustment cycles; Before the correction instruction takes effect, it must be verified by the digital signal processor for validity. Instructions that fail the verification will automatically become invalid.

[0023] In one embodiment, the various units of the adjustment module work together in a fixed order: the digital signal processor first completes the initialization configuration of the volume interval-frequency band adjustment mapping table based on preset thresholds (such as volume 1 / 3, 2 / 3, corresponding to -6dB, +3dB sound pressure levels according to the loudness curve characteristics of the human ear, matching the logarithmic law of auditory perception), providing a parameter basis for subsequent adjustment; the dynamic adjustment unit performs the main adjustment according to the mapping table and generates a first adjustment control signal; on this basis, the frequency band association adjustment unit performs compensation adjustment on the adjacent frequency bands according to 30% of the energy attenuation of the adjacent frequency bands (the compensation coefficient is obtained by fitting 50 sets of acoustic test data) and outputs a second adjustment control signal; the adjustment effect evaluation unit monitors the audio signal processed by the second adjustment control signal in real time, and generates a correction index. To ensure regulation stability, the instruction takes effect after no less than 5 (y=5) complete regulation cycles (corresponding to a 150ms delay, based on the standard sampling rate of 20ms / cycle for the audio system), and must be verified for validity by the digital signal processor using the 3σ criterion (an error exceeding 3 times the standard deviation is considered invalid). In addition, a conflict resolution mechanism is provided. When a conflict occurs between the first regulation control signal and the second regulation control signal, the first regulation control signal is executed first. At the same time, an overload protection priority channel is set. When the peak voltage exceeds the safety threshold (set to +18dBFS, in line with digital audio industry safety standards), the current regulation is immediately interrupted, and a step-by-step attenuation is performed at a rate of -3dB / ms until the voltage returns to normal. During this period, the first and second regulation control signals are suspended.

[0024] The volume range-frequency band adjustment mapping table is configured based on the preset threshold range; The threshold interval includes a preset first threshold and a preset second threshold; The digital signal processor has a built-in preset volume range-frequency band adjustment mapping table for matching the corresponding first adjustment control signal according to the voltage amplitude parameter; The corresponding relationship between the adjustment amount of the first target frequency band, the second target frequency band and the third target frequency band and the voltage amplitude parameter conforms to the linear increase or attenuation logic.

[0025] The frequency band correlation adjustment unit is configured to perform correlation adjustment according to energy changes of adjacent frequency bands when independently adjusting the first target frequency band, the second target frequency band or the third target frequency band; When the first adjustment control signal performs an attenuation operation on the second target frequency band, the frequency band association adjustment unit measures the energy attenuation amount of the second target frequency band in real time; and compensatingly improving the gains of the first target frequency band and the third target frequency band according to a preset proportional coefficient; The proportionality factor is inversely proportional to the distance between the center frequencies of adjacent frequency bands and is used to maintain the overall energy balance of the adjusted audio signal.

[0026] In one embodiment, the digital signal processor has a built-in volume range-frequency band adjustment mapping table configured based on a preset threshold range (e.g., the preset first threshold corresponds to 1 / 3 of the volume, and the preset second threshold corresponds to 2 / 3 of the volume). According to the voltage amplitude parameter output by the processing module, the first adjustment control signal is accurately matched and output, wherein the adjustment amount and voltage amplitude parameter of the first target frequency band (low frequency band), the second target frequency band (mid-frequency band), and the third target frequency band (high frequency band) follow a linear increase and decrease logic, and the frequency band associated adjustment unit adjusts any target frequency band independently according to the corresponding Correlated regulation is implemented for energy changes in adjacent frequency bands: When the first adjustment control signal attenuates the mid-frequency band (second target frequency band), the adjustment unit calculates the energy attenuation in real time and applies compensatory gain boost to the low-frequency band (first target frequency band) and high-frequency band (third target frequency band) according to a preset proportional coefficient (this coefficient is inversely proportional to the distance between the center frequencies of adjacent frequency bands. For example, for every 1kHz increase in the distance between the center frequencies of adjacent frequency bands, the proportional coefficient decreases by 0.1. 30 sets of adjustment experiments in different frequency bands have verified that the overall energy balance of the audio signal can be effectively maintained. This ensures a smooth transition of sound quality and avoids frequency band imbalance.

[0027] The adjustment effect evaluation unit is used to perform real-time effect evaluation and parameter correction on the adjusted audio signal; The adjustment effect evaluation unit determines whether the adjustment effect meets the preset optimization target by calculating the characteristic indicators of the audio signal before and after adjustment; Characteristic indicators include spectrum similarity and energy distribution uniformity; If the evaluation result shows over-regulation or under-regulation, the regulation effect evaluation unit generates a parameter correction signal; The gain coefficient in the regulation control signal is dynamically adjusted within a preset range to build a closed-loop feedback control mechanism for the regulation parameters.

[0028] In one embodiment, the adjustment effect evaluation unit performs real-time effect evaluation and parameter correction on the adjusted audio signal, and determines whether the adjustment effect meets the preset optimization target by calculating two characteristic indicators: the spectrum similarity of the audio signals before and after adjustment (the preset threshold is greater than or equal to 85%, determined based on the audio perception hash algorithm) and the energy distribution uniformity (the energy difference between frequency bands is less than or equal to 3dB, in line with the ITU-R BS.1770 standard). If the evaluation result shows that the spectrum similarity is lower than the threshold or the energy distribution deviation exceeds the range, it is determined that the adjustment is excessive or insufficient. The adjustment effect evaluation unit will generate a parameter correction signal to dynamically adjust the gain coefficient in the adjustment control signal within the range of ±15% (as verified by 20 groups of comparative tests, this range can balance the adjustment accuracy and stability), and construct a closed-loop feedback control mechanism for the adjustment parameters to ensure that the audio signal continues to converge to the optimization target.

[0029] The closed-loop feedback control mechanism includes parameter correction signal generation and dynamic gain adjustment; When the adjustment effect evaluation unit determines that there is over-adjustment or under-adjustment, the parameter correction signal generates a correction instruction in the corresponding direction; After receiving the correction instruction, the dynamic gain adjustment implements a gradient adjustment within a preset range on the gain coefficient in the regulation control signal; The gradient adjustment step size is positively correlated with the evaluation deviation amplitude until the adjustment effect meets the preset optimization target.

[0030] In one embodiment, the adjustment effect evaluation unit implements parameter correction and dynamic gain adjustment through a closed-loop feedback control mechanism: when it is determined that the adjustment is excessive or insufficient, a correction instruction in the corresponding direction is generated. After receiving the instruction, the dynamic gain adjustment module implements a gradient adjustment on the gain coefficient according to a preset gradient step size (initial step size 0.5dB, based on the minimum perceptible loudness change threshold of the human ear). The step size is positively correlated with the evaluation deviation amplitude (for example, for every 1dB increase in the deviation, the step size increases by 0.2dB), and the maximum step size does not exceed 2dB (to avoid sudden changes in sound quality). The adjustment process forms a dynamic adjustment logic by real-time calculation of the current deviation, historical cumulative deviation and deviation change rate to ensure adjustment accuracy and stability, until the spectrum similarity is greater than or equal to 85% and the frequency band energy difference is less than or equal to 3dB (in compliance with the ITU-R BS.1770 standard).

[0031] A two-way feedback control channel is set between the regulation module and the processing module, specifically including: The processing module monitors the peak voltage of the regulated audio signal in real time and generates an overload warning signal; When the regulation module receives an overload signal, it triggers the dynamic compression mechanism of the overload protection priority channel, specifically including: Implementing a step-by-step attenuation adjustment on the gain of the first target frequency band, the second target frequency band, or the third target frequency band through the overload protection priority channel within a set time until the peak voltage reaches a preset safety range; The dynamic compression mechanism includes an overload detection trigger unit and a frequency band gain gradient adjustment unit; An overload detection trigger unit generates an overload warning signal and transmits it to the regulation module when the processing module detects that the peak voltage of the regulated audio signal exceeds a safety threshold; After receiving the overload warning signal, the frequency band gain gradient adjustment unit implements a step-by-step attenuation adjustment on the gain of the first target frequency band, the second target frequency band or the third target frequency band that triggers the overload within a set time range until the peak voltage falls back to a preset safety range.

[0032] In one embodiment, a bidirectional feedback control channel is established between the regulation module and the processing module to achieve dynamic adjustment of overload protection. The processing module uses real-time monitoring of the peak voltage of the regulated audio signal as an early warning basis. The safety threshold is set to +18dBFS (in compliance with digital audio industry safety standards). When the peak voltage exceeds this threshold, an overload warning signal is immediately generated and transmitted to the regulation module. Upon receiving the warning signal, the regulation module activates the dynamic compression mechanism of the overload protection priority channel: the overload detection trigger unit is responsible for receiving and verifying the warning signal. After confirming the overload, the frequency band gain gradient adjustment unit performs adjustment according to a preset strategy - using an initial attenuation step of 3dB and a stepped adjustment method of 2dB every 50ms (tested with 50 sets of audio signals, this parameter can effectively avoid sound quality distortion). The gain of the first target frequency band (low frequency band), the second target frequency band (mid frequency band), or the third target frequency band (high frequency band) that triggers the overload is attenuated until the peak voltage falls back to a safe range, ensuring that the audio signal maintains stable output even in the overload state.

[0033] The processing module and the regulating module are connected via a general input and output interface; The voltage amplitude parameters are output to the regulation module through the input and output interface.

[0034] In one embodiment, the processing module and the adjustment module use a general input and output (GPIO) interface to achieve electrical connection and data interaction. The interface supports bidirectional data transmission function to meet the stable transmission requirements of audio signal parameters. The processing module transmits the audio signal voltage amplitude parameters after diode rectification and analog-to-digital conversion to the adjustment module in real time in the form of digital signals through the GPIO interface, providing the core data basis for the adjustment module to execute the volume range-frequency band adjustment mapping table configuration and dynamic gain adjustment operations, ensuring the accuracy and timeliness of data interaction between modules.

[0035] The present invention uses its precise adjustment capabilities to process audio signals in meticulous detail, achieve smooth transitions between low-frequency bands, mid-frequency bands and high-frequency bands, effectively avoid sudden changes in sound quality, and provide users with a natural, smooth and layered auditory feast. It dynamically maintains signal energy balance according to audio characteristics, and can optimize sound comfort whether it is soothing classical music or passionate rock music, and easily adapt to a variety of audio scenes. Its powerful adaptive optimization function monitors and adjusts in real time through a closed-loop feedback mechanism to ensure that each adjustment can accurately meet the expected effect. In the face of complex situations such as aging of audio equipment and environmental changes, it can automatically calibrate the preset threshold and always maintain an efficient operating state. In addition, the thoughtful overload protection mechanism provides a solid guarantee for the safe and stable operation of audio equipment, and comprehensively improves the quality and reliability of audio sound field calibration.

[0036] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code. The storage medium may be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sound field calibration and optimization system, characterized in that: It includes input module, processing module, adjustment module and output module; The input module is used to receive the audio signal and transmit it to the processing module; The processing module is used to convert the volume AC signal in the audio signal into a DC signal, obtain a voltage change parameter, and output a voltage amplitude parameter to transmit to the adjustment module; The adjustment module outputs a corresponding adjustment control signal by identifying the voltage amplitude parameter, dynamically adjusts the adjustment control signal, adjusts the corresponding frequency band of the audio signal according to the adjustment control signal, and transmits the adjusted signal to the output module; The output module is used to output the adjusted audio signal.

2. The acoustic sound field calibration and optimization system according to claim 1, wherein: The DC signal is obtained by converting the volume AC signal through a diode; The processing module has a built-in analog-to-digital conversion module for converting the voltage change parameter of the DC signal into a digital signal; Identify the corresponding sound amplitude value according to the digital signal to obtain a voltage amplitude parameter; The dynamic adjustment process is a linear change adjustment; At the switching boundary of different intervals of the voltage amplitude parameter, the first target frequency band adjustment amount transitions linearly; The first target frequency band corresponds to a low frequency band; The adjustment control signal includes a first adjustment control signal and a second adjustment control signal; The corresponding frequency bands include a first target frequency band, a second target frequency band, and a third target frequency band.

3. The acoustic sound field calibration and optimization system according to claim 2, wherein: The adjustment module includes a dynamic adjustment unit, a digital signal processor, a frequency band association adjustment unit and an adjustment effect evaluation unit; The dynamic adjustment unit includes: When the volume corresponding to the voltage amplitude parameter is below a preset first threshold: The ratio of the first adjustment control signal to increase the first target frequency band is within a first preset range; The boost ratio increases linearly as the voltage amplitude parameter decreases; When the volume corresponding to the voltage amplitude parameter exceeds a preset second threshold: The attenuation ratio of the first adjustment control signal to the second target frequency band is within a second preset range; The attenuation ratio increases linearly as the voltage amplitude parameter increases; The ratio of the first adjustment control signal to increase the third target frequency band is within a third preset range; The boost ratio increases linearly with the increase of the voltage amplitude parameter; When the volume corresponding to the voltage amplitude parameter is between a preset first threshold and a preset second threshold: The adjustment amounts of the first target frequency band, the second target frequency band, and the third target frequency band by the first adjustment control signal are linearly interpolated according to preset calibration parameters to achieve smooth transition; The second target frequency band corresponds to a mid-frequency band; The third target frequency band corresponds to a high frequency band; The dynamic correction curve of the volume interval boundary is fitted by n sets of historical adjustment data, so that the preset first threshold and the preset second threshold are automatically calibrated according to the aging of the audio equipment or the environmental changes.

4. The acoustic sound field calibration and optimization system according to claim 3, wherein: A fixed execution order is set among the dynamic adjustment unit, digital signal processor, frequency band association adjustment unit and adjustment effect evaluation unit of the adjustment module, specifically including: The digital signal processor preferentially completes initialization configuration of a volume range-frequency band adjustment mapping table; The dynamic adjustment unit performs a main adjustment operation based on the mapping table after initialization configuration to generate a first adjustment control signal; The frequency band association adjustment unit receives the first adjustment control signal, performs compensation adjustment on adjacent frequency bands, and generates a second adjustment control signal; The adjustment effect evaluation unit receives the audio signal adjusted by the second adjustment control signal and performs real-time monitoring to generate a correction instruction; The correction instruction takes effect in the next complete adjustment cycle; Setting a conflict resolution mechanism for the adjustment module specifically includes: When a first adjustment control signal generated by the dynamic adjustment unit conflicts with a second adjustment control signal generated by the frequency band association adjustment unit regarding the gain adjustment amount of the same frequency band, the first adjustment control signal is executed first; The compensation adjustment of the frequency band association adjustment unit is adjusted based on the gain of the first adjustment control signal; Setting an overload protection priority channel for the regulation module specifically includes: When it is detected that the peak voltage exceeds the safety threshold, all current regulation operations are immediately interrupted, and the overload protection regulation is triggered and executed first until the peak voltage reaches the safe range; During the overload protection period, the first adjustment control signal generated by the dynamic adjustment unit and the second adjustment control signal generated by the frequency band association adjustment unit are temporarily suspended; The correction mechanism of the adjustment effect evaluation unit sets the execution delay, specifically including: The correction instruction generated by the evaluation unit takes effect after no less than y complete adjustment cycles; The correction instruction needs to be verified for validity by a digital signal processor before it takes effect, and instructions that fail the verification will automatically become invalid.

5. The acoustic sound field calibration and optimization system according to claim 4, wherein: The volume interval-frequency band adjustment mapping table is configured based on a preset threshold interval; The threshold interval includes a preset first threshold and a preset second threshold; The digital signal processor has a built-in preset volume range-frequency band adjustment mapping table for matching the corresponding first adjustment control signal according to the voltage amplitude parameter; The corresponding relationship between the adjustment amount and the voltage amplitude parameter of the first target frequency band, the second target frequency band and the third target frequency band conforms to the linear increase or attenuation logic.

6. The acoustic sound field calibration and optimization system according to claim 5, wherein: The frequency band association adjustment unit is configured to perform association adjustment according to energy changes of adjacent frequency bands when independently adjusting the first target frequency band, the second target frequency band or the third target frequency band; When the first adjustment control signal performs an attenuation operation on the second target frequency band, the frequency band association adjustment unit measures the energy attenuation amount of the second target frequency band in real time; and compensatingly improving the gains of the first target frequency band and the third target frequency band according to a preset proportional coefficient; The proportional coefficient is inversely proportional to the distance between the center frequencies of adjacent frequency bands, and is used to maintain the overall energy balance of the adjusted audio signal.

7. The acoustic sound field calibration and optimization system according to claim 6, wherein: The adjustment effect evaluation unit is used to perform real-time effect evaluation and parameter correction on the adjusted audio signal; The adjustment effect evaluation unit determines whether the adjustment effect meets the preset optimization target by calculating the characteristic index of the audio signal before and after adjustment; The characteristic indicators include spectrum similarity and energy distribution uniformity; If the evaluation result indicates that over-regulation or under-regulation occurs, the regulation effect evaluation unit generates a parameter correction signal; The gain coefficient in the regulation control signal is dynamically adjusted within a preset range to build a closed-loop feedback control mechanism for the regulation parameters.

8. The acoustic sound field calibration and optimization system according to claim 7, wherein: The closed-loop feedback control mechanism includes parameter correction signal generation and dynamic gain adjustment; When the adjustment effect evaluation unit determines that there is over-adjustment or under-adjustment, the parameter correction signal generates a correction instruction in the corresponding direction; After receiving the correction instruction, the dynamic gain adjustment performs a gradient adjustment within a preset range on the gain coefficient in the adjustment control signal; The gradient adjustment step size is positively correlated with the evaluation deviation amplitude until the adjustment effect meets the preset optimization target.

9. The acoustic sound field calibration and optimization system according to claim 8, wherein: A bidirectional feedback control channel is set between the adjustment module and the processing module, specifically including: The processing module monitors the peak voltage of the regulated audio signal in real time and generates an overload warning signal; When the regulating module receives an overload signal, the dynamic compression mechanism of the overload protection priority channel is triggered, specifically including: Implementing a step-by-step attenuation adjustment on the gain of the first target frequency band, the second target frequency band, or the third target frequency band through the overload protection priority channel within a set time until the peak voltage reaches a preset safety range; The dynamic compression mechanism includes an overload detection trigger unit and a frequency band gain gradient adjustment unit; The overload detection trigger unit generates an overload warning signal and transmits it to the regulation module when the processing module detects that the peak voltage of the regulated audio signal exceeds a safety threshold; After receiving the overload warning signal, the frequency band gain gradient adjustment unit implements a stepped attenuation adjustment on the gain of the first target frequency band, the second target frequency band or the third target frequency band that triggers the overload within a set time range until the peak voltage falls back to a preset safety range.

10. The acoustic sound field calibration and optimization system according to claim 9, wherein: The processing module is connected to the adjustment module via a universal input and output interface; The voltage amplitude parameter is output to the adjustment module through the input and output interface.

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