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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