R. SHARMA, V. P. PYARA 465

will not be maximum, hence denoising will not be the

best. Maximum PSNR value for shehnai sound is at level

5 with db10 wavelet, dafli at level 5 with dmey and flute

at level 4 with db10 respectively. When each block is

denoised, all the blocks are concatenated to form the fi-

nal denoised signal. It is also observed that when modi-

fied threshold with is used, the PSNR values are in-

creased. Higher thresholds remove the noise well but

some parts of the original signal are also removed be-

cause it is not possible to remove the noise without af-

fecting the original signal.

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