Estimation of Phone Mismatch Penalty Matricesfor Two-Stage Keyword Spotting

Chang Woo HAN  Shin Jae KANG  Nam Soo KIM  

IEICE TRANSACTIONS on Information and Systems   Vol.E93-D   No.8   pp.2331-2335
Publication Date: 2010/08/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E93.D.2331
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Speech and Hearing
phone mismatch penalty matrices,  multistage keyword spotting,  phone recognition,  

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In this letter, we propose a novel approach to estimate three different kinds of phone mismatch penalty matrices for two-stage keyword spotting. When the output of a phone recognizer is given, detection of a specific keyword is carried out through text matching with the phone sequences provided by the specified keyword using the proposed phone mismatch penalty matrices. The penalty matrices associated with substitution, insertion and deletion errors are estimated from the training data through deliberate error generation. The proposed approach has shown a significant improvement in a Korean continuous speech recognition task.