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Re: Hissing Noise removal

This technique must be well known in some circles because of the
success that certain companies (e.g., Cedar Audio Ltd, U.K.) and
computer programs (e.g., Cool Edit) have had in performing noise
reduction during the last decade or so. Hiss reduction or
removal is just one part of the process of restoration of old
recordings. Hopefully, the book

Simon J. Godsill and Peter J. W. Rayer, Digital Audio Restoration:
A Statistical Model Approach, Springer-Verlag, 1998.

would reveal some of the secrets.

However, one way is to use a short-time spectral analysis method
which models the input signal as a collection of sine waves and
ignores the noise below a certain threshold. A version of this
is contained in the SNDAN software package. I think it can also
be done with the SMS package. Both of these are free downloads.

Jim Beauchamp
Univ. of Illinois at Urbana-Champaign

Pinaki S. Chanda wrote:
>From: "Pinaki S. Chanda" <cpinaki@xxxxxxxxxxxxxx>
>Date:         Fri, 26 Aug 2005 08:38:24 -0000
>To: AUDITORY@xxxxxxxxxxxxxxx
>Subject:      Hissing Noise removal
>Hi,  I would like to get some information on hissing noise removal
>algorithms for audio signals. Could anyone please give me some pointers
>/references on different signal processing algorithms to remove hissing
>noise from digital audio tracks Thanks and regards,Pinaki S. Chanda