The phase-modulation effects which are responsible for tracing distortion in stereodisk systems are discussed, and analytical expressions are provided for calculating the magnitudes of the theoretical distortion products. Experimental results for the reduction of tracing distortion by re-recording techniques are presented and a method for electrically simulating tracing distortion is described. Simulation techniques have been embodied in a device known as the Dynamic Recording Correlator; results of using it in a recording system to reduce tracing distortion in playback are presented.
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https://aes2.org/publications/elibrary-page/?id=781
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