The present invention provides a circuit for use in an ADPCM synthesizer for generating a function of a quantization step without the use of a look-up table. Illustratively, the function is represented in a piecewise linear fashion. This permits an ADPCM synthesizer to be implemented without the use...http://www.google.fr/patents/US5524024?utm_source=gb-gplus-shareBrevet US5524024 - ADPCM synthesizer without look-up table
