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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
Publication Date: 2010/08/01
Online ISSN: 1745-1361
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.