Digital filter tree

Details Digital filter tree Digital filter tree

H - Electricity

03

H

328/0.7

H03H 17/02 (2006.01)

Patent

CA 1288827

ABSTRACT OF THE DISCLOSURE The invention relates to a digital filter tree composed of a plurality of digital filter banks arranged in a tree structure one behind the other to branch out in stages with a separation into L? individual signals taking place in each stage and the sampling rate being reduced each time by the factor M? where ? = 1, 2, ... identifies the ?th stage. The filter tree employs a prototype filter with half-band functions for channel center frequencies f? = ? B + B/2, with a real frequency multiplex input signal being separated into L? complex channel signals for further processing by means of a discrete Fourier transformation. For all stages M?= 2 and L? = 4 are fixed, with only two signals of the L? = 4 being utilized. The arrangement permits adaptation of a hierarchical multi-stage method also to numbers of channels which are not equal to a power of two without changing the input sampling frequency and without the causing channels, whose number is fixed by the difference from the next higher power of two, to idle.

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