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Method for rebuilding circulation calm sound source by boundary element method

A boundary element method and sound source technology, applied in the field of signal reconstruction, can solve problems such as unapplicable, difficult data acquisition, and undiscovered problems

Inactive Publication Date: 2008-08-27
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, for a general non-stationary sound field, the statistical characteristic parameters of the sound signal are time-varying, so it is no longer possible to use the time average instead of the ensemble average, which makes data collection very difficult and it is difficult to analyze the characteristics of the sound field
[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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  • Method for rebuilding circulation calm sound source by boundary element method
  • Method for rebuilding circulation calm sound source by boundary element method
  • Method for rebuilding circulation calm sound source by boundary element method

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Embodiment Construction

[0060] The embodiments of the present invention are described in detail below: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and processes are given, but the protection scope of the present invention is not limited to the following embodiments:

[0061] 1. A loudspeaker is used to produce sound to form a cyclically stable sound source, and a microphone is arranged near the loudspeaker to extract the reference signal. The excitation source of the loudspeaker is:

[0062] V=Acos(2πf 1 t)*noise(t),

[0063] Among them: A=1, f 1 =300, noise is band-pass colored noise.

[0064] 2. First, arrange 20 microphones into a linear microphone array, scan and collect the sound pressure of the holographic measurement points on the holographic measurement surface in turn, and finally form a 20×20 holographic measurement surface array; at the same time, use the reference source microphone to collect...

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Abstract

The invention relates to a method of reconstructing a circular stable sound source through the boundary element method 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 vector of the sound source signal to be measured through reconstruction computing via the boundary element method. Through the reconstruction of the sound source signal on the holographic measurement surface acquired by the microphone array, the method can analyze the sound source with random shape and obtain the three-dimensional spectrum correlated density distribution of the sound source. Compared with the traditional method of identifying the sound source through the near-field acoustic holographic technology, the method can be applicable to the circular stable sound source with breakthrough on the requirements of the shape of the sound source.

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 boundary element method. Background technique [0002] In order to effectively control noise, before noise reduction measures are implemented, noise source diagnosis must be performed first to determine the location and characteristics of the main noise sources. With the development of modern signal processing technology, spectrum analysis technology, coherent and partial coherent analysis technology, sound intensity analysis technology and acoustic near-field holography technology have been developed rapidly. [0003] Cyclostationary signals are a special kind of non-stationary signals. Due to their unique cycle stationarity, the records collected in a single time have periodic traversal characteristics, and methods for analyzing such non-stationary signals are added. Cyclostationary signa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 蒋伟康张海滨万泉
Owner SHANGHAI JIAO TONG UNIV
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