Method of Ultrasonic Signal De-Noising Based on Lifting Wavelet Improved Threshold

Zhou Yang Bi; Jian Hui Chen; Wen Jie Ju; Ming Wang; Ji Chen Li

doi:10.4028/www.scientific.net/AMM.513-517.3818

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 513-517Method of Ultrasonic Signal De-Noising Based on...

Method of Ultrasonic Signal De-Noising Based on Lifting Wavelet Improved Threshold

Abstract:

The article established the mathematical model of ultrasonic flaw echo signals. First, the basic theory of wavelet transform is introduced, the principle of the wavelet threshold de-noising method is analyzed; Then on the basis of soft and hard threshold function, the paper proposes a method based on lifting wavelet de-noising. And from two aspects of signal-to-noise ratio (SNR) and mean square error (MSE) the de-noising performance is analysed. The results show that the method improved the shortcomings of soft and hard threshold de-noising method, and got a better de-noising performance and higher signal-to-noise ratio. So in real-time signal de-noising aspect the lifting wavelet has a very good application prospect.

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Periodical:

Applied Mechanics and Materials (Volumes 513-517)

Pages:

3818-3821

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.513-517.3818

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Online since:

February 2014

Authors:

Zhou Yang Bi*, Jian Hui Chen, Wen Jie Ju, Ming Wang, Ji Chen Li

Keywords:

Lifting Wavelet, Threshold Function, Ultrasonic Signal, Wavelet Threshold De-Noising

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* - Corresponding Author

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