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Method for rebuilding circulation calm sound source by overlapping spherical wave

A spherical wave, sound source technology, applied in the field of signal reconstruction, can solve problems such as inability to apply, difficult to analyze sound source characteristics, and yet to be found.

Inactive Publication Date: 2010-10-06
SHANGHAI JIAOTONG UNIV
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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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  • Method for rebuilding circulation calm sound source by overlapping spherical wave
  • Method for rebuilding circulation calm sound source by overlapping spherical wave
  • Method for rebuilding circulation calm sound source by overlapping spherical wave

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Embodiment Construction

[0053] The embodiments of the present invention are described in detail below: the present embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following embodiments:

[0054] 1. A spherical loudspeaker is used to sound to form a cyclostationary sound source to be tested, and a microphone is arranged near the loudspeaker to extract reference signals. The excitation source of the loudspeaker is:

[0055] V=Acos(2πf 1 t)*noise(t),

[0056] Where: A=1, f 1 =300, noise is band-pass colored noise.

[0057] 2. First arrange 20 microphones into a linear microphone array, scan and collect the sound pressure of the holographic measurement points in turn on the holographic measurement surface, and finally form a 20×20 holographic measurement surface array; at the same time, use the reference source microphone...

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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, themethod 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...

Claims

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Application Information

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