Méthode multifonction de restauration des enregistrements anciens

Abstract
Developments in digital signal processing allow sound engineers to restore old recordings. The elementary tools used in the mentioned processes are digital editing of sound supported by the advanced visualization of the processed signal, equalizing filtering and adaptive digital filtering used to diminish continuous noise. Moreover, various methods of the elimination of impulse noises were tried. Some of the above methods were practically applied to the constructed computer sound restoration system presented in the paper. Consequently, the multi-task sound restoration method was proposed and practically employed. Application of some types of procedures to the sound restoration of old recordings will be discussed. The reduction of background noise using digital filtering in the critical bands was investigated. Another procedure for old magnetic tape echoes cancellation was implemented and tested. Application of smoothing filters to the elimination of noises will be also discussed.