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Wavelet-transform-based cetacean sound signal denoising method and device

A technology of wavelet transform and whale sound, which is applied in the field of underwater acoustic detection, can solve the problems of introducing ocean noise and achieve the effect of reducing the impact

Inactive Publication Date: 2016-10-12
TIANJIN UNIV
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Problems solved by technology

However, the cetacean call signal passes through the underwater acoustic channel from the emission point to the collection point, so it will be introduced into the ocean noise

Method used

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  • Wavelet-transform-based cetacean sound signal denoising method and device

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Embodiment Construction

[0014] In order to overcome the deficiencies of the prior art, the present invention provides a method and device for denoising cetacean call signals based on wavelet transform.

[0015] The technical scheme adopted by the present invention is a method and device for denoising cetacean call signals based on wavelet transform, and its realization device is as follows: figure 1 As shown, the implementation process is as follows:

[0016] At first, the cetacean call that gathers is stored in the cetacean database 1, then, carry out M layer wavelet decomposition processing to each section whale in the cetacean database by wavelet transformer 2;

[0017] Further, the selection of the wavelet function can be determined according to the characteristics of the actual whale sound. For example, the Haar-Walsh wavelet function can be selected for the whale sound pulse with many jumps. If the whale sound pulse contains sinusoidal components or high-frequency oscillations, local Triangula...

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Abstract

The invention belongs to the field of underwater acoustic detection, and aims to reduce the influence of marine noise on signals and restores true original cetacean sound signals. According to the technical scheme adopted by the invention, wavelet-transform-based cetacean sound signal denoising method and device are provided; acquired cetacean sounds are stored into a whale sound database; a wavelet transformer is used to carry out M layer wavelet decomposition on whale sounds of various sections in the whale sound database; according to unprocessed wavelet decomposition coefficients and combined zero-set high frequency wavelet decomposition coefficients, a wavelet reconstruction device is used to carry out signal reconstruction based on a wavelet reconstruction principle; reconstructed signals are stored into a denoised whale sound database; and a whale sound database memory, the wavelet transformer, a threshold setter, the wavelet reconstruction device and a denoised whale sound database memory are integrated in a curing circuit module on a field-programmin gate array chip or a separate curing circuit module. The method and the device are mainly applied to underwater acoustic detection.

Description

technical field [0001] The invention belongs to the field of underwater acoustic detection, in particular to a method and device for denoising cetacean call signals based on wavelet transform. Background technique [0002] Cetaceans will emit call signals into the ocean, and these signals will be received by signal acquisition equipment after passing through the underwater acoustic channel. However, the cetacean call signal is transmitted through the underwater acoustic channel from the emission point to the collection point, so it will be introduced into the ocean noise. In order to reduce the influence of ocean noise on the signal and restore a more realistic original cetacean call signal, the present invention processes the cetacean call signal based on wavelet transform to reduce the influence of the ocean noise signal. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the present invention aims to provide a method and device f...

Claims

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Application Information

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IPC IPC(8): G10L21/028
CPCG10L21/028
Inventor 蒋佳佳段发阶王宪全马世雄
Owner TIANJIN UNIV
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