Application Of Synchronous Phenomenon In A Nervous System To The Pitch Period Detection Of Speech

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It has been f ound t hat an integral pulse frequency m odulation ( denoted I PFM) with an absolute refractory period (denoted ARP), [defined as a period d uring which an input s ignal is n ot integrated], in a nervous system generates 1 for n synchronous phenomenon ( in t hat s tate, 1 synchronous p ulse p er n periods of input periodic signal occurs). The mechanism o f t he synchronization has become clear f or an input sine wave. The experiments of the pitch period detection of quasi-speech were carried out by use of IPFM with ARP. The method to realize a synchronous state rapidly, when the amplitude and the pitch period of quasi-speech change on a large s cale, i s l eft f or future research.

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