고정 반사계수를 갖는 격자 트랜스버설 결합 적응필터

국문 초록 (Abstract)

본 논문에서는 적은 계산량으로도 빠른 수렴 속도를 얻을 수 있도록 고정반사계수를 갖는 격자 트랜스버설 결합 적응필터를 제안하였다. 필터의 반사계수는 음성신호의 통계적 특성에 따라 주어지며, 격자예측기의 차수는 1을 제안하였다. 제안한 적응필터가 트랜스버설 적응필터에 비해 무시할 만한 추가 계산량으로도 고속 수렴함이 실험을 통하여 입증되었다. ITU-T G.168 표준안의 대역제한된 유성음신호를 사용한 실험에서 제안된 적응필터는 적응 트랜스버설 필터에 비해 약 6배 빨리 수렴하였다.

다국어 초록 (Multilingual Abstract)

We present a lattice transversal joint (LTJ) adaptive filter with fixed reflection coefficients to achieve fast convergence with low complexity. The reflection coefficients of the filter are given by the statistics of speech signals, and the proposed order of the lattice predictor is one. Experimental results confirm that as compared to the adaptive transversal filter, the proposed adaptive filter achieves fast convergence with a negligible increase in complexity. The proposed adaptive filter converges around six times faster than the adaptive transversal filter in case of the band-limited voiced signal from the ITU-T G.168 standard.

목차 (Table of Contents)

• 요약
• Abstract
• I. Introduction
• II. LTJ Adaptive Filter
• III. The Proposed Adaptive Filter
• IV. Experimental Results
• 1. Voiced signal from the ITU-T G.168
• 2. Speech signal
• V. Conclusion
• References

참고문헌 (Reference)

1 "http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voice box. html"

2 "ITU-T G.168 : Recommendations for Digital Network Echo Cancellers, International Telecommunication Union Telecommunication Standardization Sector"

3 "Fundamentals of Adaptive Filtering" John Wiley & Sons 2003

4 E. H. Satorious, "Channel equalization using adaptive lattice algorithm" 27 : 899-905, 1979

5 Naoki Tokui, "Block implementation of a synchronized learning algorithm in adaptive lattice filters" 2003

6 Jae-Ha Yoo, "An acoustic echo cancellation based on the adaptive lattice-transversal joint (LTJ) filter structure" E81-A (E81-A): 1951-1954, 1998

7 Naoki Tokui, "A synchronized learning algorithm for reflection coefficients and tap weight in a joint lattice predictor and transversal filter" 2001

8 Jae-Ha Yoo, "A general analysis and complexity reduction for the lattice transversal joint adaptive filter" Computers and Communications 2002