This paper presents a method to reconstruct a digital audio signal from a physical and analog sound-recording medium such as the Edison cylinder. A non-contact 3D optical profilometer based on white-light interferometry provides topographic information about small overlapping sections of the recording medium. For each of these sections, the natural curvature of the medium is compensated, grooves on the surface are detected, and short depth trajectories representing the audio signal are extracted. These trajectories are then concatenated to produce a digital audio signal that is post-processed to simulate the distinctive frequency response of an actual mechanical player. The effectiveness of this method is demonstrated on both tonal and vocal recordings using time, frequency, and time-frequency features as well as informal listening.

Authors: Thai, Khac Phuc Hung; Gournay, Philippe; Lefebvre, Roch; Charlebois, Serge
Affiliations: INSA Centre Val de Loire, Blois, France; Université de Sherbrooke, Sherbrooke, QC, Canada(See document for exact affiliation information.)
AES Convention: 138 (May 2015) Paper Number: 9300
Publication Date: May 6, 2015
Subject: Applications in Audio

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