SPEECH RECOGNITION SYSTEM WHICH AVOIDS AMBIGUITY WHEN MATCHING FREQUENCY SPECTRA BY EMPLOYING AN ADDITIONAL VERBAL FEATURE

In a speech recognition system using normalized spectrum matching, a second feature pattern is calculated and compared with reference patterns. The similarity obtained as a result of the comparison is used to determine overall similarity, from which the recognition is made. The second feature pattern can be a spectrum variation pattern, a level decrease pattern, or a spectrum relative value pattern.