tailieunhanh - Báo cáo hóa học: " Research Article An Approach for Synthesis of Modulated M-Channel FIR Filter Banks Utilizing the Frequency-Response Masking Technique"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article An Approach for Synthesis of Modulated M-Channel FIR Filter Banks Utilizing the Frequency-Response Masking Technique | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 68285 13 pages doi 2007 68285 Research Article An Approach for Synthesis of Modulated M-Channel FIR Filter Banks Utilizing the Frequency-Response Masking Technique Linnea Rosenbaum Per Lowenborg and Hakan Johansson Department of Electrical Engineering Linkoping University 581 83 Linkoping Sweden Received 22 December 2005 Revised 29 June 2006 Accepted 26 August 2006 Recommended by Soontorn Oraintara The frequency-response masking FRM technique was introduced as a means of generating linear-phase FIR filters with narrow transition band and low arithmetic complexity. This paper proposes an approach for synthesizing modulated maximally decimated FIR filter banks FBs utilizing the FRM technique. A new tailored class of FRM filters is introduced and used for synthesizing nonlinear-phase analysis and synthesis filters. Each of the analysis and synthesis FBs is realized with the aid of only three subfilters one cosine-modulation block and one sine-modulation block. The overall FB is a near-perfect reconstruction NPR FB which in this case means that the distortion function has a linear-phase response but small magnitude errors. Small aliasing errors are also introduced by the FB. However by allowing these small errors that can be made arbitrarily small the arithmetic complexity can be reduced. Compared to conventional cosine-modulated FBs the proposed ones lower significantly the overall arithmetic complexity at the expense of a slightly increased overall FB delay in applications requiring narrow transition bands. Compared to other proposals that also combine cosine-modulated FBs with the FRM technique the arithmetic complexity can typically be reduced by 40 in specifications with narrow transition bands. Finally a general design procedure is given for the proposed FBs and examples are included to illustrate their benefits. Copyright 2007 Linnea Rosenbaum et al. .