NDLI: A novel approach to design of signal matched QMF and DFT filter bank

Content Provider	IEEE Xplore Digital Library
Author	Nalbalwar, S. Joshi, S.D. Patney, R.K.
Copyright Year	2007
Description	Author affiliation: IIT Delhi, Delhi (Nalbalwar, S.; Joshi, S.D.; Patney, R.K.)
Abstract	In this paper, we propose three different filter bank structures matched to a signals or its statistics namely: 2-channel uniform filter bank, M-channel dyadic nonuniform filter bank and M-channel modified DFT filter bank. First, 2-channel QMF analysis filter bank matched to a signal or its statistics is obtained. In order to obtain this filter bank, the given sequence is first divided into even and odd subsequences. For each subsequence predictor is estimated. By combining these predictors in such a way that the resultant signals represent the different frequency bands, analysis low pass and high pass filters are obtained and then by combining the inverses of linear predictors corresponding synthesis filters are easily obtained. In this manner two channel signal matched QMF bank is estimated by using same approach, we present, M-channel NUFB model matched to the signal or its statistics. To estimate the filters of this model, first we estimate two channel QMF analysis bank and then using the signal across the low pass subband, 2-channel analysis bank is obtained again in the same fashion. By cascading these two 2-channel analysis banks, 3-channel non-uniform filter with decimation factors {2 ,4, 4} matched to signal or its statistics is estimated. Further, proposed approach is also extended to find M-channel residual error DFT filter bank (modified DFT filter bank). In this approach, first given sequence is divided into M-subsequences and for each subsequence predictor coefficients are estimated and then these predictors are combine using DFT matrix. Filter banks design using proposed approach are computationally inexpensive and also they give compression results equal to or better than uniform counter part. To validate the theory the results of compression on speech clips are tabulated in the table.
Starting Page	1
Ending Page	6
File Size	225898
Page Count	6
File Format	PDF
ISBN	9789536114931
DOI	10.1109/SOFTCOM.2007.4446139
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-27
Publisher Place	Croatia
Access Restriction	Subscribed
Rights Holder	Univ of Split-FESB
Subject Keyword	Frequency synthesizers Statistical analysis Nonlinear filters Filter bank Band pass filters Channel bank filters Signal synthesis Signal analysis Statistics Signal design
Content Type	Text
Resource Type	Article

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