Noise reduction, applied to the restoration of old recordings, remains a crucial problem, particularly when the signal-to-noise ratio differs considerably according to the frequency area. The signal is first separated through a subband decomposition, using wavelet techniques. Noise reduction is then applied individually to each subband. Results confirmed by psychoacoustic tests indicate that a real improvement in signal quality has been achieved.

Authors: Simon, L.; Valiere, J. C.; Depollier, C.
Affiliation: Laboratoire d'Acoustique de I'Universite du Maine, Le Mans, France
AES Convention: 94 (March 1993) Paper Number: 3461
Publication Date: March 1, 1993
Subject: Digital Recordings and Reproduction

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