Process and device for segmentation into sub-bands and for recon

Details Process and device for segmentation into sub-bands and for recon Process and device for segmentation into sub-bands and for recon

1993-10-29

1997-03-11

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375265, 375296, 375340, 375341, 375349, 375350, 370484, 348388, 348403, H04K 110

Patent

active

056109440

ABSTRACT:
A process and device for segmentation into and reconstruction from sub-bands of a digital signal each sample of which are submitted to a parallel processing on a plurality of paths by prototype filtering modulated by a periodic function and sub-sampling by the number of sub-bands. A combination of a filtering of modified polyphase type and of a processing by frequency transform is therefor performed so as to deliver a sub-band signal for each path of corresponding rank. Reconstruction comprises in combination the dual steps of frequency transform and modified polyphase filtering so as to deliver a reconstructed digital signal. Corresponding modules for frequency transform and modifyed polyphase filtering are embodied through MOT or PRMF filters.

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Crochiere et al, "Multiple Digital Signal Processing", pp. 303-323, Prentice Hall, 1983.
IEEE Transactions on Signal Processing, vol. 40, No. 4, Apr. 1992, "Cosine-Modulated FIR Filter Banks Satisfying Perfect Reconstruction" by Koilpillai et al, pp. 770-782.
IEEE International Symposium on Circuits and Systems, Harris et al, "Modified Polyphase Filter Structure for Computing Interpolated Data as Successive Differential Corrections", Jun. 1991, pp. 2753-2756.

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