Conceptual system design for continuous speech recognition LSI

Speech recognition equipment is basically composed of these function blocks: a distinctive parameter extractor (analyzer); a calculator for the distance between input speech and standard patterns in each analyzing frame; a standard pattern memory; a calculator, to compare patterns, as a whole, using a DP matching process; a final judgement apparatus; and a system control. It is advisable that function blocks which are less effected by algorithmic change be designed as custom LSIs. Other function blocks, which are more effected, should be designed using general purpose signal processing LSIs and MSIs. A continuous speech recognition system has been designed from this philosophical base. In this system, a high speed signal processer (HSP) is adopted as an analyzer. The whole matching calculation block is designed as a custom LSI.