High Quality Speech Synthesis Using ADPCM Technology

This paper presents the Adaptive Differential Pulse Code Modulation (ADPCM) method of digitally storing and reproducing speech or other waveforms. A detailed explanation of the encoding steps is given. Also presented is a family of integrated circuits which provide a practical implementation of ADPCM techniques for the analysis and synthesis of speech or other waveforms. The operation of one of the devices is explained in detail, both at the system and device levels.