DTW based Utterance Rejection on Broadcasting News Keyword Spotting System

방송뉴스 핵심어 검출 시스템에서의 오인식 거부를 위한 DTW의 적용

Keyword spotting is effective to find keyword from the continuously pronounced speech. However, non-keyword may be accepted as keyword when the environmental noise occurs or speaker changes. To overcome this performance degradation, utterance rejection techniques using confidence measure on the recognition result have been developed. In this paper, we apply DTW to the HMM based broadcasting news keyword spotting system for rejecting non-keyword. Experimental result shows that false acceptance rate is decreased to 50%.