한국지능시스템학회논문지 (Journal of the Korean Institute of Intelligent Systems)

  • 제24권6호
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  • Pages.628-633
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  • 2014
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  • 1976-9172(pISSN)
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  • 2288-2324(eISSN)
한국지능시스템학회 (Korean Institute of Intelligent Systems)
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주입력신호의 LPC 필터 이득을 이용한 반향제거기의 수렴전 동시통화검출 성능 개선

Performance Improvement of Double Talk Detection before Convergence of the Echo Canceller by Using Linear Predictive Coding Filter Gain of the Primary Input Signal

  • 유재하 (한경대학교 전기전자제어공학과/IT융합연구소)
  • Yoo, Jae-Ha (Dept. of Electrical, Electronic and Control Engineering, Hankyong National University)
  • 투고 : 2014.10.16
  • 심사 : 2014.11.17
  • 발행 : 2014.12.25
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초록

본 논문에서는 반향제거기가 수렴하기 전에 동작할 수 있는 기존 동시통화검출법의 성능을 개선하기 위한 방법을 제안하였다. 제안된 방법은 LPC 필터 계수를 주입력신호로부터 추정하게 된다. 동시통화검출을 위한 문턱치는 주입력신호의 크기별로 기대되는 LPC 필터 이득치를 사용하여 가변적으로 설정하게 된다. 제안한 방법은 기존의 방법이 갖고 있는 단일통화를 동시통화로 잘못 판단하는 오검출률을 개선할 수 있을 뿐만 아니라 동시통화 검출 지연 시간도 단축시킬 수 있다. 장시간의 음성신호를 사용한 모의실험을 수행하였다. 제안한 방법이 기존 방법의 오검출률을 감소시키고 동시통화 검출 지연시간을 단축시킴을 확인할 수 있었다.

This paper proposes a performance improvement method of the conventional double talk detection method which can operate before convergence of the echo canceller. The proposed method estimates the coefficients of the linear predictive coding(LPC) filter by using the primary input signal. The time-varying threshold for double talk detection is determined based on the LPC filter gain of the primary input signal level. The proposed method can reduce not only false detection rate which means wrong detection of single talk as double talk but also double talk detection delay. Computer simulation was performed using a long-term real speech signals. It is shown that the proposed method improves the conventional method in terms of lowering the false detection rate and shortening the detection delay.

키워드

참고문헌

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