Reproduction of phonograph record sound using digital image processing

Abstract

We have conducted a series of studies on a non-contact groove sensing and reproduction of sound signal from phonograph records based on digital image and signal processing. Images of sound grooves were captured by a PC scanner having an appropriate resolution. After an image processing is performed to improve the image contrast, we have investigated filtering methods to extract the position of the groove edges. In addition, we have linearized the arc-shaped groove lines in order to make subsequent signal processing easy. Finally, we have attempted to reproduce the recorded sound waveform using a set of coordinates of the groove edges and created a WAVE-file for sound playback on PCs. © 2013 The Institute of Electrical Engineers of Japan.