Some Techniques for Wow Effect Reduction

Wow distortion reduction has not attracted an adequate scientific attention so far. Only few papers on the subject are available, concerning mostly archive gramophone records, wax cylinders, and magnetic tapes affected by wow. This paper outlines researched wow reduction algorithms concerning archive movie soundtracks, or more generally audio recordings accompanying archival visual contents. The methods presented here are based on the pilot tone tracking, on the spectral analysis of genuine audio components, and on non-uniform resampling. The paper provides only a short overview of the concepts founding those methods; other studied approaches to the wow processing, as well as a more detailed description of the presented ones, can be found in referenced papers.