서지주요정보
Adaptive comb filtering을 적용한 이동 통신 환경에서의 강인한 음성 인식 = Robust speech recognition using adaptive comb filtering in mobile communication environment
서명 / 저자 Adaptive comb filtering을 적용한 이동 통신 환경에서의 강인한 음성 인식 = Robust speech recognition using adaptive comb filtering in mobile communication environment / 박정식.
발행사항 [대전 : 한국과학기술원, 2003].
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등록번호

8014208

소장위치/청구기호

학술문화관(문화관) 보존서고

MCS 03021

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초록정보

There has been much effort to realize speech recognition technology in mobile communication environment. The research works, especially on the way extracting feature parameters used for recognition, can be classified into three categories - the ways of feature extraction from input speech of codec, the packet created from encoder, and output speech of codec are available. Among these, the first way has limits to be used because the speech recognition system must be equipped with on a phone which has low computational power and memory. There was a study that the recognition parameters extracted from the packet gives higher performance than those from output speech. But with the results on experiments in noise environment, I found that the performance of parameters extracted from output speech is higher. This is because of an effect of QCELP coder which decreases the energy in silence (or non-speech) frames. But there still exist the noise components in speech frames and we can improve the performance through noise reduction in those output speech frames. In this thesis, the adaptive comb filtering is employed for this work. Adaptive comb filter has two constraints such that it can be applied only to the voiced frames and it must estimate reliable pitch period. The proposed method uses two kinds of information extracted from the packet to solve these problems. One is the frame rate related to a decision on a speech or silence frame and the other is pitch period information which is measured precisely by QCELP coder. Experiment results proved that the speech recognition system employing the proposed front-end gives superior performance in noise environment over a recognizer using feature parameters extracted directly from output speech or using those obtained applying the spectral subtraction to output speech.

서지기타정보

서지기타정보
청구기호 {MCS 03021
형태사항 vii, 40 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jeong-Sik Park
지도교수의 한글표기 : 오영환
지도교수의 영문표기 : Yung-Hwan Oh
학위논문 학위논문(석사) - 한국과학기술원 : 전산학전공,
서지주기 참고문헌 : p. 37-40
주제 음성 인식
이동 통신 환경
적응 콤 필터링
강인한 음성 인식
Speech Recognition
Mobile Communication Environment
Adaptive Comb Filtering
Robust Speech Recognition
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