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A Novel Block De-Noising Algorithm for Sounds of Indian Musical Instruments with Modified Threshold in Wavelet Domain

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 221)

Abstract

The problem of estimating the musical instrument sound signal, corrupted by additive white Gaussian noise has been of interest to many researchers for practical as well as theoretical reasons. The removal of white Gaussian noise is difficult as it persists at all the frequencies in the signal. Many of the methods, especially those based on wavelet technique have become popular, due to the number of advantages over the traditional methods. It has been shown that wavelet based thresholding is simple and optimal solution, also guarantees better rate of convergence. In this paper, a novel DWT based algorithm using block de-noising along with modified threshold is proposed. For experimental purpose, the sound signals of shehnai, dafli and flute are taken. The signal is first divided into the multiple blocks of samples and then both hard and soft thresholding methods are used on each block. All the blocks obtained after individual block de-noising are concatenated to get the final de-noised signal. When the sound signal corrupted with variable percentage of Gaussian noise, passed through this algorithm; significant improvement in PSNR is observed over normal wavelet thresholding method. The quality of sound signal obtained through this algorithm is perceptually close to original signal.

Keywords

Block denoising Gaussian noise Wavelet thresholding Wavelet coefficients 

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Copyright information

© Springer India 2013

Authors and Affiliations

  1. 1.Department of Electrical EngineeringDayalbagh Educational InstituteAgraIndia

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