PROBLEM TO BE SOLVED: To provide an improved type device which verfies oral uttering and conducts a decoding. SOLUTION: The method and the device verify an orally provided password and a sentence by requirements for less-complicated decoder. The method makes it possible to orally verify orally delivered password/sentence without using a large scale vocabulary decoding in the computations. The decoder is desirable to be used with a special set of a competitive and simplified base form that is a target/base form (representing original contents to be verified) by employing a finite state grammar(FSG).
ORAL UTTERING DENIAL WHICH USES LABEL FUNCTION HAVING GRAMMAR RESTRICTION