Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)

The Acoustical Society of Korea (한국음향학회)
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Preemphasis of Speech Signals in the Estimation of Time Difference of Arrival with Two Microphones

마이크로폰 쌍을 이용한 음원의 도달시간차이 추정에서 음성신호의 프리엠퍼시스 영향 분석

  • Kwon Hongseok (Department of Electronics, Kyungpook National University) ;
  • Kim Siho (Department of Electronics, Kyungpook National University) ;
  • Bae Keunsung (Department of Electronics, Kyungpook National University)
  • 권홍석 (경북대학교 전자공학과) ;
  • 김시호 (경북대학교 전자공학과) ;
  • 배건성 (경북대학교 전자공학과)
  • Published : 2004.11.01
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Abstract

In this paper, we investigate and analyze the problems encountered in frame-based estimation of TDOA(Time Difference of Arrival) using CPSP function. Spectral leakage occurring in framing of a speech signal by a rectangular window makes estimation of CPSP spectrum inaccurate. Framing with a Hamming window to reduce the spectral leakage effect distorts the signal due to the different weighting at temporally same sample, which make the TDOA estimation using CPSP function inaccurate. In this paper, we solve this problem by reducing the dynamic range of the spectrum of a speech signal with preemphasis. Experimental results confirm that the framing of pre-emphasized microphone output with a rectangular window shows higher success ratio of TDOA estimation than any other framing methods.

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