대한전기학회논문지:시스템및제어부문D (The Transactions of the Korean Institute of Electrical Engineers D)

대한전기학회 (The Korean Institute of Electrical Engineers)
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음성 신호의 다구간 에너지 차를 이용한 새로운 프리엠퍼시스 방법에 관한 연구

A Study on a New Pre-emphasis Method Using the Short-Term Energy Difference of Speech Signal

  • 김동준 (청주대 이공대 전자정보통신반도체공학부) ;
  • 김주리 (청주대 리공대 전자공학과)
  • 발행 : 2001.12.01
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초록

The pre-emphasis is an essential process for speech signal processing. Widely used two methods are the typical method using a fixed value near unity and te optimal method using the autocorrelation ratio of the signal. This study proposes a new pre-emphasis method using the short-term energy difference of speech signal, which can effectively compensate the glottal source characteristics and lip radiation characteristics. Using the proposed pre-emphasis, speech analysis, such as spectrum estimation, formant detection, is performed and the results are compared with those of the conventional two pre-emphasis methods. The speech analysis with 5 single vowels showed that the proposed method enhanced the spectral shapes and gave nearly constant formant frequencies and could escape the overlapping of adjacent two formants. comparison with FFT spectra had verified the above results and showed the accuracy of the proposed method. The computational complexity of the proposed method reduced to about 50% of the optimal method.

키워드

참고문헌

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