Method for rebuilding circulation calm sound source by overlapping spherical wave

Abstract

The invention relates to a method of reconstructing a circular stable sound source to be measured through spherical wave superposition in the signal reconstruction technical field. Through setting the sound source to be measured, a microphone array and a reference source microphone, the invention synchronously records the acquired reference signal and holographic measuring point sound pressure, obtains a reference phase from the reference signal, obtains the relative phase relation of the holographic measuring point source pressure acquired by the microphone array through the phase relation between the reference signal and the holographic measuring point source pressure, and finally obtains the self-spectrum correlated density matrix of the sound source signal to be measured through the spherical wave basis function reconstruction computing. Through the reconstruction of the sound source signal to be measured on the holographic measurement surface acquired by the microphone array, the method can analyze the sound source to be measure with random shape and obtain the three-dimensional spectrum correlated density distribution of the sound source to be measured. Compared with the traditional method of reconstructing the stable sound source to be measured through spherical wave superposition, the method can be applicable to the circular stable sound source to be measured with breakthrough on the requirements of the shape of the sound source to be measured.

Description

technical field [0001] The invention relates to a method in the technical field of signal reconstruction, in particular to a method for reconstructing a cyclostationary sound source by using a spherical wave superposition method. Background technique [0002] In order to effectively control noise, before noise reduction measures are implemented, noise source diagnosis must be carried out first to determine the location and characteristics of major noise sources. With the development of modern signal processing technology, spectral analysis technology, coherent and partial coherent analysis technology, sound intensity analysis technology and acoustic near-field holography technology have been developed rapidly. [0003] Cyclostationary signal is a special kind of non-stationary signal. Due to its unique cycle stationarity, the records collected at a single time have cycle ergodic characteristics, and methods for analyzing such non-stationary signals have been added. Cyclosta...

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Problems solved by technology

However, for a general non-stationary sound source, the statistical characteristic parameters of the sound source signal are time-varying, so it is no longer possible to replace the ensemble average with time averaging, which makes data collection very difficult and it is difficult to analyze the characteristics of the sound source

[0005] The Chinese patent publication number in the prior art literature: 1487500, titled: "A method for identifying non-stationary sound sources using near-field acoustic holography technology", this technology has analyzed planar cyclostationary sound sources, but it cannot be applied to any shape

In further searches, no literature reports identical or similar to the subject of the present invention have been found

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