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Audio Signal Denoising Algorithm by Adaptive Block Thresholding using STFT

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Audio Signal Denoising Algorithm by Adaptive Block Thresholding using STFT


Apoorva Athaley | Papiya Dutta

https://doi.org/10.31142/ijtsrd2512



Apoorva Athaley | Papiya Dutta "Audio Signal Denoising Algorithm by Adaptive Block Thresholding using STFT" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-1 | Issue-6, October 2017, pp.289-300, URL: https://www.ijtsrd.com/papers/ijtsrd2512.pdf

In this work performance comparison of Time-frequency algorithms is presented for removal of Additive White Gaussian Noise. For better time-frequency resolution properties & better adaptability of STFT, it is used in this work. Most of the audio sound signals are too large to be processed entirely; for Mozart signal of 10 second sampled at 11 KHz will contain 11,000 samples. Processing such a large block of data demands rigorous requirements of hardware & software, also the execution time is very long, hence less speed. Hence data is segmented into blocks & each block of data is then processed individually. The important task is to choose the block length. The signal is segmented into blocks, of optimal length & then, denoising is performed in STFT domain by thresholding the STFT coefficients. When each block is denoised by taking optimal window size or block size, it is further concluded that STFT based algorithm proposed here is superior in terms of quality of the denoised signal & the execution time. It is observed that adaptive block hard type thresholding with STFT gives the best SNR for sound signal. It is further concluded that proposed algorithm performs better than other algorithms in respect of SNR & time of execution.

STFT; Adaptive Block Denoising; Signal to Noise Ratio; Thresholding


IJTSRD2512
Volume-1 | Issue-6, October 2017
289-300
IJTSRD | www.ijtsrd.com | E-ISSN 2456-6470
Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0)

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