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Design of M-Channel IIR Cosine-Modulated Filter Bank and Application to Acoustic Echo Cancellation  

Kim, Sang-Gyun (Dept. of Electrical Engineering and Computer Science, KAIST)
Yoo, Chang-Dong (Dept. of Electrical Engineering and Computer Science, KAIST)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.39, no.5, 2002 , pp. 556-563 More about this Journal
Abstract
In this paper, a novel method for designing an M-channel, causal, stable IIR cosine-modulated filter bank (CMFB) with near PR property is proposed. The IIR prototype filter is designed with a simple constraint using lattice stucture with 1st order allpass filter components. The IIR prototype filter which is designed by the proposed method has higher stopband attenuation and sharper roll-off characteristic than the one which is designed by the previously proposed method with similar complexity. The proposed M-channel IIR CMFB which is designed from this IIR prototype filter is applied to subband acoustic echo canceller (AEC). We obtained about 15dB higher ERLE using this subband AEC than when M-channel FIR subband AEC with similar complexity.
Keywords
Cosine-modulated filter bank; IIR filter bank; aliasing; acoustic echo cancellation;
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