Rotary sound source recognition method based on mixed time frequency domain

A technology of sound source identification and time-frequency domain, applied in voice analysis, instruments, measuring devices, etc., can solve problems such as high sampling frequency, achieve high calculation efficiency, excellent sidelobe suppression, and reduce the effect of sampling frequency in time domain

Active Publication Date: 2019-04-16
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

However, the fast iterative shrinkage threshold algorithm based on Fourier transform still needs a higher sampling frequency

Method used

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  • Rotary sound source recognition method based on mixed time frequency domain
  • Rotary sound source recognition method based on mixed time frequency domain
  • Rotary sound source recognition method based on mixed time frequency domain

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0043] The present invention comprises the following steps:

[0044] Step 1. Identify the sound source using time-domain tracking Delay and Sum (DAS)

[0045] Assuming that the rotating sound source is at the mth microphone position r at time t m The time-domain sound pressure generated at (m=1,2,3,..., M is the serial number of the microphone) is p(r m ,t).

[0046] Time-domain tracking of the jth scanning grid point on the sound source scanning surface DAS beamforming output b j The time signal of (t) is:

[0047]

[0048] In formula (1), j=1,2,3,...,J, J is the total number of scanning grid points, r j (t) is the position vector of the jth scanning grid point at time t, r mj (t) represents the distance from the mth microphone to the jth scanning grid point at time t, c is the speed of sound; T mj (r m ,r j (t)) represents the transfer function ...

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Abstract

The invention discloses a rotary sound source recognition method based on a mixed time frequency domain. The method comprises the following steps that 1, a sound source recognized by using a DAS; and2, a sound source recognition result is cleared based on a frequency domain deconvolution method, in the unconstrained optimization formula (please see the equation, described in the specification), aregularization parameter is selected (please see the equation, described in the specification, about lambda), wherein II . II infinite represents an infinite norm; and the sound source recognition anti-convolution method adopts an iterative method for solving the sound source intensity q. The method has the technical effects that the sound source recognition performance of the existing hybrid time domain method under the high time domain sampling frequency can be achieved by adopting a lower time domain sampling frequency.

Description

technical field [0001] The invention belongs to the technical field of sound field recognition, and in particular relates to a rotating sound source recognition method based on a mixed time-frequency domain. Background technique [0002] For a sound source rotating at a certain angular velocity, the time-domain tracking DAS is combined with the deconvolution method to form a hybrid time-frequency domain method, which can produce high-resolution imaging results. The first step of the method is to use time domain tracking to identify the sound source; the second step is to clarify the sound source identification result based on the frequency domain deconvolution method. However, the hybrid time-frequency domain method requires high sampling frequency for oversampling to achieve accurate time delay. When the sampling frequency is low, the time delay calculation is inaccurate, the time-domain DAS beamforming result is inaccurate, and the spatial convergence of the subsequent de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01S11/14G10L17/00G10L25/51
CPCG01B11/002G01S11/14G10L17/00G10L25/51
Inventor 褚志刚周其祥张鑫杨洋
Owner CHONGQING UNIV
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