Methods of reducing background noise, with digital filtering techniques in old recordings are presented. Different high pass filters have been used to detect impulsive noise, including the -compactly supported wavelets- of I.Daubechies. Two techniques of reconstructing the musical signal during the impulse are described, the linear prediction, and a method using the wavelets of I.Daubechies respectively. Finally, an algorithm worked out by Ephraim and Malah is used to suppress the permanent surface noise.

Authors: Valiere, J. C.; Montresor, S.; Allard, J. F.; Baudry, M.
Affiliation: Laboratoire d'Acoustique, Laboratoire d'Informatique, Universite du Maine, Le Mans, France
AES Convention: 88 (March 1990) Paper Number: 2915
Publication Date: March 1, 1990
Subject: History

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