The Ultrasonic Signal De-Noising Method Based on an Improved Wavelet Threshold Function

Qing Xuan Wang; Ai Hua Dong

doi:10.4028/www.scientific.net/AMR.230-232.564

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 230-232The Ultrasonic Signal De-Noising Method Based on...

The Ultrasonic Signal De-Noising Method Based on an Improved Wavelet Threshold Function

Abstract:

Making use of the advantages of the soft and hard threshold methods proposed by Donoho, this paper presents a deviation variable based on quadratic polynomial and differentiable improvement function, according to the characteristics of the underground water pipe leakage signal. In the paper we constructed the mathematical model of the function, utilized wavelet de-noising algorithm for the collected ultrasonic signal de-noising, compared the de-noising effect by means of the value of Signal to Noise Ratio (SNR) and Mean Squared Error (MSE). Results show that the new function has the better de-noising effect compared with the original threshold function.

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Periodical:

Advanced Materials Research (Volumes 230-232)

Pages:

564-568

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.230-232.564

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Online since:

May 2011

Authors:

Qing Xuan Wang, Ai Hua Dong

Keywords:

MSE, SNR, Threshold De-Noising, Wavelet

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