Three-dimensional optical reconstruction using two-dimensional optical flow measured on the rotating groove surfaces of gramophone recordings will enhance our ability to preserve this valuable audio legacy without depending on mechanical contact playback. A modified microscope overcame the limitation of a shallow depth of field by using a thin glass plate to obtain an image at a second focal length. Sound is decoded from the orientation of the groove surface. The algorithm has been tested and validated using both damaged and undamaged records. Informal listening tests confirmed a subjective reduction of pops and other degradations.

Authors: Tian, Baozhong; Barron, John L.
Affiliations: Department of Computer Science, Leonard C. Nelson College of Engineering and Sciences, Institute of Technology, West Virginia University, Montgomery, WV, USA; Department of Computer Science, The University of Western Ontario, London, Ont., Canada(See document for exact affiliation information.)
JAES Volume 59 Issue 7/8 pp. 514-538; July 2011
Publication Date: September 1, 2011

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