서지주요정보
롬바드 효과 보상 필터를 이용한 강인한 특징 추출 방법 = Robust feature extraction using Lombard effect compensation filter
서명 / 저자 롬바드 효과 보상 필터를 이용한 강인한 특징 추출 방법 = Robust feature extraction using Lombard effect compensation filter / 우수영.
저자명 우수영 ; Woo, Soo-Young
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014146

소장위치/청구기호

학술문화관(문화관) 보존서고

MEE 03061

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

It is well known that the performance of speech recognition systems degrades under the presence of Lombard effect which refers to a change in the speaking style when the speaker is in a noisy environment. This thesis describes a feature compensation method that reduces the Lombard effect of the test data so that the mismatch between the training and the test data is reduced. In this thesis, it is assumed that the Lombard speech is the output of a linear time-invariant system where the input is normal speech. The Lombard generating system is denoted as G and the objective of the thesis is to find and evaluate the performance of the inverse $G^{-1}$ which we call the Lombard compensation filter. The magnitude response of the proposed Lombard compensation filter is obtained by taking the ratio of the spectra of normal speech and Lombard speech. The compensation filters are obtained under the following three separate assumptions: 1) G is independent of speech characteristics, 2) G is dependent on voiced/unvoiced frame decision and 3) G depends on the 7 phoneme groups classification of speech. To eliminate any error due to classification or any frame decision in the evaluation, correct frame decision was assumed known. The proposed Lombard compensation method was found to reduce the word error rate (WER) of 50 Korean words with Lombard effect. Using 13th mel-frequency cepstral coefficients (MFCC) features, the word error rate of 35.25% with baseline was improved to 29.85%, 29.2%, 28.42% respectively under the three assumptions.

서지기타정보

서지기타정보
청구기호 {MEE 03061
형태사항 vii, 50 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Soo-Young Woo
지도교수의 한글표기 : 유창동
지도교수의 영문표기 : Chang-Dong Yoo
학위논문 학위논문(석사) - 한국과학기술원 : 전기및전자공학전공,
서지주기 참고문헌 : p. 49-50
주제 Lombard effect
Lombard compensation filter
feature extraction
speech recognition
롬바드 효과
롬바드 보상 필터
특징 추출
음성 인식
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