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잡음 상황에서 DUET 블라인드 신호 분리 알고리즘과 스케일 계수 추정을 이용한 음향 반향신호 제거
김경재(K.J. Kim),서재범(J.B. Seo),남상원(S.W. Nam) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, a new acoustic echo cancellation approach based on the DUET algorithm and scaling factor estimation is proposed to solve the scaling ambiguity in case of blind separation based acoustic echo cancellation in a noisy environment. In hands-free full-duplex communication system, acoustic noises picked up by the microphone are mixed with echo signal. For this reason, the echo cancellation system may provide poor performance. For that purpose, a degenerate unmixing estimation technique, adjusted in the time-frequency domain, is employed to separate undesired echo signals and noises. Also, since scaling and permutation ambiguities have not been solved in the blind source separation algorithm, kurtosis for the desired signal selection and a scaling factor estimation algorithm are utilized in this paper for the separation of an echo signal. Simulation results demonstrate that the proposed approach yields better echo cancellation and noise reduction performances. compared with conventional methods.
다공질 실리콘 산화법을 이용한 MMIC 기판의 제조 및 그 특성
권오준(O . J . Kwon),김경재(K . J . Kim),이재승(J . S . Lee),이종현(J . H . Lee),최현철(H . C . Choi),이정희(J . H . Lee),김기완(K . W . Kim) 한국센서학회 1999 센서학회지 Vol.8 No.2
Microstrip line was fabricated on the oxidized porous silicon layer which has nearly electrically and chemically identical properties with thermally oxidized silicon layer. Thick oxidized porous silicon layer of few tenth of micrometers was prepared by thermal oxidation of porous silicon layer on silicon substrate. Multi-step thermal oxidation process warm used obtain high quality arid thick oxidised silicon layer and to release thermal stress. Microstrip line warm fabricated on the oxidized porous silicon layer. Its microwave characteristics were measured and the availability for MMIC substrate was investigated.