Title:
ACOUSTIC ARRAY IMAGING METHOD FOR HIGH-RESOLUTION SPECTRUM ESTIMATION
Document Type and Number:
WIPO Patent Application WO/2023/207047
Kind Code:
A1
Abstract:
An acoustic array imaging method for high-resolution spectrum estimation. The method comprises: performing a fast Fourier transform on a sound signal, which is received by a microphone array, so as to obtain frequency-domain data; determining a high-resolution area and a low-resolution area by means of a constant beamwidth beamformer; calculating low-resolution sound pressure distributions by means of a delay-and-sum beamformer; in the high-resolution area, sorting the low-resolution sound pressure distributions, focusing on the vicinity of a sound source position point, improving a resolution and then calculating a spatial spectrum distribution, and performing loop iteration in this manner, so as to finally reach a target spatial high resolution; and performing frequency point energy sorting on a high-resolution spatial spectrum of a sound source, focusing on the vicinity of a sound source frequency point, improving a frequency resolution, calculating a non-integer digital Fourier transform, calculating a frequency spectrum, and performing loop iteration in this manner to finally reach a target frequency high resolution. By using the method, the calculation of a sound pressure distribution of an ambient noise area can be effectively reduced, and a high-resolution spatial sonogram distribution and a high-resolution frequency sonogram distribution around a sound source are obtained.
Inventors:
XU DONGYANG (CN)
WANG ZHI (CN)
CAI SHENGSHENG (CN)
HU NAN (CN)
ZHANG NING (CN)
WANG ZHI (CN)
CAI SHENGSHENG (CN)
HU NAN (CN)
ZHANG NING (CN)
Application Number:
PCT/CN2022/133106
Publication Date:
November 02, 2023
Filing Date:
November 21, 2022
Export Citation:
Assignee:
HUZHOU INSTITUTE OF ZHEJIANG UNIV (CN)
International Classes:
G10L21/0388; G01S5/20
Foreign References:
| CN114578289A | 2022-06-03 | |||
| CN111239680A | 2020-06-05 | |||
| CN113176536A | 2021-07-27 | |||
| CN110383378A | 2019-10-25 | |||
| JP2018170718A | 2018-11-01 | |||
| JPH0467856A | 1992-03-03 |
Attorney, Agent or Firm:
SHANGHAI XINLONG INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
Download PDF: