NDLI: A combined approach for broadband noise reduction

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A combined approach for broadband noise reduction

Content Provider	IEEE Xplore Digital Library
Author	Lorber, M. Hoeldrich, R.
Copyright Year	1997
Description	Author affiliation: Inst. of Electron. Music Graz, Graz, Austria (Lorber, M.)
Abstract	This paper deals with broadband noise reduction for the restoration of audio recordings. The signals are processed in the frequency domain using the short-time Fourier transform. A method based on non-linear spectral subtraction is presented. To prevent the annoying phenomenon of musical noise which is caused by the noise suppression process, over-subtraction is applied to the degraded signal spectrum. This means that depending on the estimated signal-to-noise ratio (SNR) more than the average noise spectrum is subtracted. A masking threshold obtained by spectral smoothing of the degraded signal spectrum is used to determine the SNR. Furthermore, time-averaging is applied to the SNR. The averaging procedures in the time and frequency domain reduce the SNR variance. Therefore, audible processing distortions are reduced, too.
File Size	444169
File Format	PDF
ISBN	0780339088
DOI	10.1109/ASPAA.1997.625606
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise reduction Signal to noise ratio Signal processing Frequency domain analysis Degradation Signal restoration Audio recording Fourier transforms Acoustic noise Masking threshold
Content Type	Text
Resource Type	Article

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