CN-121037741-B - Sound wireless transmission synchronous playing system

Abstract

The invention discloses a wireless transmission synchronous playing system of sound equipment, which relates to the technical field of audio synchronization and comprises an acoustic diagnosis control subsystem and a synchronous correction subsystem, wherein the acoustic diagnosis control subsystem is used for collecting a current environment sound signal through a microphone arranged in the sound equipment, separating a high-frequency component and a low-frequency component from the current environment sound signal, determining the phase offset probability density of the high-frequency component and the spatial energy distribution probability density of the low-frequency component, determining the conflict value of the high-frequency component and the low-frequency component according to the KL divergence of the phase offset probability density and the spatial energy distribution probability density, executing a multi-physical field collaborative diagnosis method if the conflict value is larger than a first preset conflict threshold value to obtain a diagnosis result, and the synchronous correction subsystem is used for responding to the diagnosis result to adjust the audio output of the sound equipment. The invention realizes the improvement of the wireless transmission synchronization capability of the sound equipment.

Inventors

• SU LIPING

Assignees

• 深圳市立平科技有限公司

Dates

Publication Date

20260508

Application Date

20251017

Claims (4)

1. 1. The audio wireless transmission synchronous playing system is characterized by comprising an acoustic diagnosis control subsystem and a synchronous correction subsystem, wherein the acoustic diagnosis control subsystem is used for: collecting current environmental sound signals through a microphone arranged in the sound equipment; separating a high-frequency component and a low-frequency component from the current ambient sound signal by a preset high-pass filter and a preset low-pass filter; extracting zero crossing point time sequence of the high-frequency component; generating a phase shift distribution histogram of the zero crossing point time sequence through a preset kernel density estimation algorithm to obtain the phase shift probability density; the method for determining the spatial energy distribution probability density of the low-frequency component specifically comprises the following steps: obtaining a kurtosis value in the phase shift distribution histogram; Acquiring a space grid distribution diagram of a sound field space in which the sound equipment is positioned; determining each grid sound pressure value of the space grid distribution diagram through a preset wave beam forming algorithm; Determining an energy distribution variance according to each grid sound pressure value of the space grid distribution diagram to obtain the space energy distribution probability density; Determining KL-divergences of the phase offset probability density and the spatial energy distribution probability density; Determining conflicting values of the high-frequency component and the low-frequency component according to kurtosis values in the phase offset distribution histogram and the KL divergence; If the conflict value is larger than a first preset conflict threshold value, executing a multi-physical-field collaborative diagnosis method to obtain a diagnosis result; the multi-physical field collaborative diagnosis method executed by the acoustic diagnosis control subsystem comprises the following steps: Respectively determining a high-frequency component change rate and a low-frequency component change rate according to the phase shift probability density and the spatial energy distribution probability density; if the low-frequency component change rate is greater than the high-frequency component change rate, the conflict value is greater than or equal to a first preset conflict threshold value, and the conflict value is smaller than a second preset conflict threshold value, marking the diagnosis result as environmental interference; If the low-frequency component change rate is smaller than the high-frequency component change rate, or the conflict value is larger than the second preset conflict threshold value, executing an electromagnetic characteristic analysis method; wherein the first preset conflict threshold is less than the second preset conflict threshold; an electromagnetic signature analysis method performed by the acoustic diagnostic control subsystem, comprising: monitoring electromagnetic radiation signals of a radio frequency baseband clock of the sound equipment; Determining an increase in the odd harmonic intensity of the radio frequency baseband clock from the electromagnetic radiation signal and a frequency spectrum of the electromagnetic radiation signal; If the abnormal rise of the odd harmonic intensity is detected, marking the diagnosis result as abnormal clock circuit, and executing a temperature detection method on the clock circuit of the sound; If abnormal broadening of the frequency spectrum is detected, marking the diagnosis result as power amplifier distortion, and executing a temperature detection method on a power amplifier circuit of the sound equipment; The surfaces of the clock circuit and the power amplifier circuit of the sound equipment are provided with closed micro-acoustic cavities, and piezoelectric ceramic plates are arranged in the closed micro-acoustic cavities; a temperature detection method performed by the acoustic diagnostic control subsystem, comprising: Transmitting and receiving ultrasonic pulses with fixed frequency through the piezoelectric ceramic plate; Determining a time of flight of the ultrasonic pulse from transmission to reception; determining the cavity internal temperature of the closed micro-acoustic cavity according to the flight time and the cavity size of the closed micro-acoustic cavity; If the temperature in the cavity of the closed micro-acoustic cavity of the clock circuit is greater than a preset temperature threshold, marking the diagnosis result as a heat-induced fault; If the temperature rise rate in the cavity body of the closed micro-acoustic cavity of the power amplifier circuit is larger than the preset temperature rise rate, marking the diagnosis result as a heat induction fault; the multi-physical field collaborative diagnosis method executed by the acoustic diagnosis control subsystem further comprises the following steps: collecting vibration signals of a preset frequency band through a piezoelectric ceramic piece attached to a circuit board connector of the sound equipment; If the acoustic diagnosis control subsystem marks the diagnosis result as a heat induction fault, judging whether the vibration signal is abnormal or not; if the vibration signal is abnormal, marking the diagnosis result as loosening of the connector; the synchronous correction subsystem is used for responding to the diagnosis result and adjusting the audio output of the sound equipment.
2. 2. The system of claim 1, wherein the synchronous modification subsystem is to: If the diagnosis result is marked as environmental interference, compensating the low-frequency component; If the diagnosis result is marked as abnormal in the clock circuit, determining a clock compensation amount according to the phase offset probability density, and adjusting the clock source time sequence of the radio frequency baseband clock according to the clock compensation amount; If the diagnosis result is marked as power amplification distortion, extracting a spectrum envelope of the electromagnetic radiation signal, generating a predistortion signal opposite to distortion characteristics according to the spectrum envelope, and injecting the predistortion signal into an input stage of a power amplifier of the sound; And if the diagnosis result is marked as the heat-induced fault, reducing the bias voltage of the power amplifier to a preset voltage level.
3. 3. The system of claim 1, wherein the synchronous modification subsystem is to: If the diagnosis result is marked as environmental interference, dividing the low-frequency component into a first low-frequency sub-component and a second low-frequency sub-component, wherein the first low-frequency sub-component is positioned in a first wave band range, the second low-frequency sub-component is positioned in a second wave band range, and the first wave band range is higher than the second wave band range; identifying, by a locator of the sound, an audio amplitude of the output audio of the sound; if the audio amplitude is in a first volume range, enhancing the first low-frequency subcomponent; And if the audio frequency amplitude is in a second volume range, attenuating the first low-frequency subcomponent, and enhancing the second low-frequency subcomponent, wherein the first volume range is lower than the second volume range.
4. 4. The system of claim 2, wherein if the diagnostic result is marked as clock circuit anomaly, determining a clock offset based on a phase offset probability density, and adjusting a clock source timing of a radio frequency baseband clock based on the clock offset, comprises: If the diagnosis result is marked as abnormal in the clock circuit, acquiring a preset sound wave phase reference value; determining a phase deviation between the phase offset probability density and the preset acoustic wave phase reference value; Determining a clock compensation amount according to the phase deviation; and adjusting the clock source time sequence of the radio frequency baseband clock according to the clock compensation quantity.

Description

Sound wireless transmission synchronous playing system Technical Field The invention relates to the technical field of audio synchronization, in particular to a wireless transmission synchronous playing system of sound equipment. Background In a multi-device synchronized playback scenario of a wireless sound system, sound and picture asynchronism, and distortion of sound quality (e.g., delay or discontinuity of sound) are core problems that have long plagued the user experience. The sources of such problems are generally complex, diverse and difficult to distinguish accurately, and can be mainly classified into two types, namely, environmental dynamic interference factors (such as changes of acoustic wave reflection paths caused by personnel movement and furniture position change) and hardware fault factors inside equipment (such as time sequence disorder caused by clock circuit temperature drift, frequency deviation of a crystal oscillator and the like). Conventional solutions often employ strategies to enlarge the audio data buffer in order to overcome transmission delay and jitter. However, the strategy is only a passive masking mechanism, which cannot radically solve the problem, but introduces significant fixed delay to aggravate the overall response dullness of the system, so that the problem of asynchronous audio and video presents a contradiction which is difficult to reconcile, namely, adding a buffer area sacrifices instantaneity (delay increase), and reducing the buffer area faces higher distortion risk (synchronization loss). Therefore, how to improve the wireless transmission synchronization capability of the audio is a technical problem to be solved. Disclosure of Invention The invention solves the technical problem that the wireless transmission synchronization capability of the sound equipment needs to be improved. In order to solve the technical problems, the invention provides the following technical scheme that the audio wireless transmission synchronous playing system comprises an acoustic diagnosis control subsystem and a synchronous correction subsystem, wherein the acoustic diagnosis control subsystem is used for: collecting current environmental sound signals through a microphone arranged in the sound equipment; separating high frequency components and low frequency components from the current ambient sound signal; Determining a phase shift probability density of the high frequency component and a spatial energy distribution probability density of the low frequency component; Determining conflict values of the high-frequency component and the low-frequency component according to the KL divergence of the phase shift probability density and the space energy distribution probability density; If the conflict value is larger than a first preset conflict threshold value, executing a multi-physical-field collaborative diagnosis method to obtain a diagnosis result; the synchronous correction subsystem is used for responding to the diagnosis result and adjusting the audio output of the sound equipment. Preferably, the multi-physical field collaborative diagnosis method executed by the acoustic diagnosis control subsystem includes: Respectively determining a high-frequency component change rate and a low-frequency component change rate according to the phase shift probability density and the spatial energy distribution probability density; if the low-frequency component change rate is greater than the high-frequency component change rate, the conflict value is greater than or equal to a first preset conflict threshold value, and the conflict value is smaller than a second preset conflict threshold value, marking the diagnosis result as environmental interference; If the low-frequency component change rate is smaller than the high-frequency component change rate, or the conflict value is larger than the second preset conflict threshold value, executing an electromagnetic characteristic analysis method; Wherein the first preset conflict threshold is less than the second preset conflict threshold. Preferably, the electromagnetic characteristic analysis method executed by the acoustic diagnosis control subsystem includes: monitoring electromagnetic radiation signals of a radio frequency baseband clock of the sound equipment; Determining an increase in the odd harmonic intensity of the radio frequency baseband clock from the electromagnetic radiation signal and a frequency spectrum of the electromagnetic radiation signal; If the abnormal rise of the odd harmonic intensity is detected, marking the diagnosis result as abnormal clock circuit, and executing a temperature detection method on the clock circuit of the sound; and if abnormal broadening of the frequency spectrum is detected, marking the diagnosis result as power amplifier distortion, and executing a temperature detection method on a power amplifier circuit of the sound equipment. Preferably, the surfaces of the clock circuit and the power a