Digital signal sub-band separating/combining apparatus...

Details Digital signal sub-band separating/combining apparatus... Digital signal sub-band separating/combining apparatus...

2005-02-15

2005-02-15

Corrielus, Jean B. (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Antinoise or distortion

C375S349000, C375S350000, C379S003000, C379S406010

Reexamination Certificate

active

06856653

ABSTRACT:
An apparatus having a band-separating filter bank for separating a digital signal into a plurality of sub-band signals, to be processed or transmitted, and a band-combining filter bank for subsequently combining the resultant sub-band signals into a single digital signal, wherein each of the band-separating filter bank and band-combining filter bank incorporates a FIR low pass filter having an asymmetric impulse response, as the prototype filter of the filter bank. A significant reduction can thereby be achieved in the amount of overall group delay that results from the processing performed by these filter banks.

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