Abstract

A fixed-step-size delta modulator followed by digital circuits for generating an adaptive delta modulation signal provides an attractive compromise between code efficiency and cost. In order to control the total quantizing noise, the fixed-step-size delta modulation sampling rate is higher than the adaptive delta modulation output rate. Computer simulations, based on the adaptive delta modulation technique described by N. S. Jayant, indicate that the sampling rate required for negligible degradation relative to a conventional adaptive delta modulator is well within the current state of the art. Our approach lends itself to any scheme of step-size variation and may use any means of single-integration, fixed-step-size delta modulation.

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