한국정보과학회논문지:컴퓨팅의 실제 및 레터 (Journal of KIISE:Computing Practices and Letters)

한국정보과학회 (Korean Institute of Information Scientists and Engineers)
권호 표지

이산 웨이브렛 변환을 이용한 유효 음성 추출을 위한 머징 알고리즘

A Merging Algorithm with the Discrete Wavelet Transform to Extract Valid Speech-Sounds

  • 김진옥 (성균관대학교 전기전자및컴퓨터공학부) ;
  • 황대준 (성균관대학교 전기전자및컴퓨터공학부) ;
  • 백한욱 (American-Panel Corporation 연구원) ;
  • 정진현 (광운대학교 정보제어공학과)
  • Kim, Jin-Ok (Dept.of Electric Electronics Computer Engineering, Sungkyunkwan University) ;
  • Hwang, Dae-Jun (Dept.of Electric Electronics Computer Engineering, Sungkyunkwan University) ;
  • Paek, Han-Wook ;
  • Chung, Chin-Hyun (Dept.of Information Control Instrumentation Engineering, Kwangwoon University)
  • 발행 : 2002.06.01
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초록

데이타로부터 유효한 음성 데이타를 추출하는 것은 음성 인식분야에서 중요하다. 본 논문의 음성 추출 기술은 빠른 연산이 가능하며 음성의 전처리 과정에 적합한 이산 웨이브렛 변환을 사용하고 있으며, 이산 웨이브렛 변환의 복수 해상도 해석 특징을 이용한 머징 알고리즘으로 유효한 음성을 추출하고 노이즈 제거를 동시에 구현한다. 머징 알고리즘은 음성만으로도 처리 매개변수를 결정할 수 있고 또한 시스템 잡음에 대하여서도 독립적이기 때문에, 유효 음성을 추출하는데 매우 효과적이다. 그리고 머징 알고리즘은 시스템 잡음에 대한 적응 특성을 갖고 탁월한 노이즈 분리 특성을 갖는다.

A valid speech-sound block can be classified to provide important information for speech recognition. The classification of the speech-sound block comes from the MRA(multi-resolution analysis) property of the DWT(discrete wavelet transform), which is used to reduce the computational time for the pre-processing of speech recognition. The merging algorithm is proposed to extract valid speech-sounds in terms of position and frequency range. It needs some numerical methods for an adaptive DWT implementation and performs unvoiced/voiced classification and denoising. Since the merging algorithm can decide the processing parameters relating to voices only and is independent of system noises, it is useful for extracting valid speech-sounds. The merging algorithm has an adaptive feature for arbitrary system noises and an excellent denoising SNR(signal-to-nolle ratio).

키워드

참고문헌

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