Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015
Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration - October 2015
The Measurement and Calibration of Sound Reproducing Systems - July 2015
Practical Digital Playback of Gramophone Records Using Flat-Bed Scanner Images
We present an Optical Audio Reconstruction (OAR) system to play the audio from gramophone records based on image processing. OAR uses an off-the-shelf scanner to achieve an affordable and practical method of reconstructing audio. Converting the analog records to a digital format is important for preserving many historical recordings. We scan the records using a high resolution large format flat-bed scanner. The images were then segmented and the grooves were tracked to simulate the movement of the stylus. The sound signal was converted from the groove track positions. Our OAR algorithm was able to reconstruct the audio successfully from scanned records. We demonstrated that a fast OAR system producing good quality sound can be built economically.
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