Personalised ADPCM speech playback devices for the non-vocal and the non-vocal physically handicapped

摘要

Two personalised instantaneous speech playback devices were designed and developed. Both centred upon the memory efficiency advantages of Adaptive Differential Pulse Coded Modulation (ADPCM). One system is handheld and offers 64 seconds of speech. The second system has a dictionary of 230 four second phrases and is PC based.