7 results about "Sound energy density" patented technology

The invention provides a method and system for measuring the sound source radiation sound power level in a reverberation pool, and the method comprises the steps: constructing a reverberation test system according to a preset standard, laying a hydrophone array and a to-be-measured sound source in the reverberation pool, and enabling the array element spacing of the hydrophone array to be smaller than or equal to the minimum half-wavelength; enabling the to-be-detected sound source to emit a to-be-detected signal, and collecting complete time domain sound pressure data of the to-be-detected signal; calculating the mean square sound pressure level of the measuring point in the reverberation control area based on the steady-state time domain sound pressure data of the sound signal; calculating complete time domain sound pressure data of all array elements based on Fourier transform to obtain a sound energy density change curve, and fitting the sound energy density change curve to obtain reverberation time; sound field correction is obtained through calculation according to the reverberation time, and the radiation sound power level of the sound source to be measured is obtained according to the sound field correction. According to the invention, the experiment process is simplified, the measurement efficiency is obviously improved, the experiment cost is reduced, and a new technical approach is provided for the rapid measurement of the water pool of the sound source radiation sound power level.

The invention relates to a vehicle sound insulation testing method and device, equipment and a storage medium. The method comprises the steps of obtaining a first sound signal and a second sound signal under a preset pressure working condition; the preset pressure working condition represents that the inside and outside pressure difference of the target vehicle is the preset pressure difference through the air supply flow, the first sound signal is a signal collected by a first sound collection device located inside the target vehicle, and the second sound signal is a signal collected by a second sound collection device located outside the target vehicle; a noise source outside the target vehicle is noise generated by the air supply airflow; calculating a target sound energy density difference between the first sound signal and the second sound signal; and determining a target sound insulation test result corresponding to the preset pressure working condition based on the target sound energy density difference. Traditional sound pressure level subtraction is replaced by sound energy density difference calculation, the vehicle door sound insulation test result under the specific working condition is determined based on the sound energy density difference between the sound signals inside and outside the vehicle, and the test accuracy and the test precision are improved.

This invention relates to a method for measuring the acoustic absorption coefficient of the shallow seabed, comprising the following steps: measuring the seawater depth of the experimental sea area using an echo sounder; measuring the average sound energy density generated by rainfall using a hydrophone vertical array; measuring the rainfall intensity using a rain gauge; measuring the sound power radiated underwater by rainfall per unit area of ​​the sea surface; and calculating the acoustic absorption coefficient of the shallow seabed. The measurement method of this invention has a clear principle, and by measuring the underwater noise generated by rainfall, it can cleverly measure the acoustic absorption coefficient of the shallow seabed across the entire frequency band.

The application relates to the technical field of electroacoustic processing, and discloses a microphone anti-howling system. The system continuously collects an audio input stream containing time-domain waveform data and background acoustic parameters through an audio capture module; a dynamic range compression module processes the audio stream to generate a standardized audio frame sequence; a feature extraction module extracts sound pressure space-time variation features including a sound pressure gradient field, a sound energy density distribution and a phase coherence atlas from the sequence; a howling identification network in a howling identification module outputs a howling occurrence probability and hotspot area coordinates based on the features; a probability correction module performs real-time correction on the probability according to environmental acoustic parameters; and an intervention scheme construction module generates a targeted acoustic intervention scheme according to the corrected probability and the hotspot area coordinates. The application realizes accurate identification and effective suppression of the howling phenomenon, and significantly improves the stability and sound quality performance of an audio system.

The invention relates to the technical field of acoustic engineering, in particular to a polymorphic damping material partition application configuration method and system, and the method comprises the steps: obtaining a structural model and acoustic response data of an earphone sound cavity; acquiring sound pressure distribution and modal frequency characteristics of an earphone sound cavity, and calculating sound energy density of each region; dividing each region into a plurality of acoustic partitions based on a gradient field of acoustic energy density, and extracting a dominant frequency band and a corresponding acoustic energy feature of each acoustic partition; according to the dominant frequency band and the corresponding sound energy characteristics, the damping material combination of each acoustic partition is matched; and by taking target sound pressure level deviation minimization and total mass increment as optimization targets, adjusting key parameters of damping material combinations of the partitions to obtain final partition configuration information. According to the invention, the problems of peak-valley distortion and tone deviation caused by single material and extensive arrangement in the traditional damping design are effectively solved, and the transient response capability and the overall hearing quality of the earphone in a complex acoustic environment are improved.

The invention discloses a method and a system for analyzing and inhibiting by-products of waste gas degradation, and relates to the technical field of waste gas treatment.The method comprises the steps of calculating synchronization deviation of the by-products in combination with the sound energy density change rate and the generation rate contribution proportion, generating average coupling strength and marking dominant by-products; the method comprises the following steps: calculating influence indexes of environmental parameters on generation of dominant by-products, screening the environmental parameters which have the greatest influence on generation of the dominant by-products as key control quantities, calculating a local generation rate and generating an average generation rate based on a mass conservation principle, and selecting a position corresponding to a maximum value as a key section. The time sequence matching precision of the by-product generation process is improved by combining the sound energy density change rate with the by-product generation rate contribution proportion, the real-time recognition capability of the by-product formation rule is improved by combining the acoustic dynamic characteristics with the environmental parameter influence index, and the real-time recognition capability of the by-product formation rule is improved by combining the key section recognition with the coupling deviation calculation. And the space positioning accuracy of dominant by-product inhibition is improved.

The invention relates to the technical field of electroacoustic processing, and discloses a microphone anti-howling system. The system continuously collects an audio input stream containing time domain waveform data and background acoustic parameters through an audio capture module; the dynamic range compression module processes the audio stream to generate a standardized audio frame sequence; a feature extraction module extracts sound pressure spatial-temporal change features including a sound pressure gradient field, sound energy density distribution and a phase coherence map from the sequence; a howling identification network in the howling identification module outputs a howling occurrence probability and a hot spot area coordinate based on the characteristics; the probability correction module corrects the probability in real time according to the environmental acoustic parameters; and the intervention scheme construction module generates a targeted acoustic intervention scheme according to the corrected probability and the coordinates of the hot spot region. According to the invention, accurate identification and effective suppression of the squeal phenomenon are realized, and the stability and tone quality performance of an audio system are significantly improved.