Abstract
A new algorithm for instantaneous step-size adaptation in a two-digit delta modulation system incorporating both memory and look-ahead step estimation is presented. The associated modulator generates output code words which consist of a binary and a ternary digit. Besides the wide range of step changes that it produces in the feedback waveform, it offers reduced overshoots and fast response to signal variations. Performance evaluation made by computer simulation for a band-limited RC-shaped gaussian input signal, simulating speech, reveals a considerable improvement in signal-to-noise ratio when compared with constant factor delta modulation (CFDM) and linear delta modulation (LDM) systems operating at the same output bit rate.
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