Transversal type smear-desmear filter

Details Transversal type smear-desmear filter Transversal type smear-desmear filter

H - Electricity

03

H

328/0.3

H03H 17/02 (2006.01) H03H 15/00 (2006.01) H04B 1/62 (2006.01)

Patent

CA 1175114

TITLE OF THE INVENTION A Transversal Type Smear-Desmear Filter ABSTRACT OF THE DISCLOSURE A smear-desmear filter having n frequancy dependent group delay characteristic and implemented by a transversal filter. This filter comprises a plurality of delay elements, each having the delay time 1/(2f2), where f2 is the highest frequency component of an input signal: tap weight coefficient means for obtaining the product of the output of the tap and the corresponding predetermined weight coefficient which is supplied from digital memory; and an adder for summing up a11 the output of the tap weight coefficient means. A tap and/or a tap weight coefficient means is provided for every (m) number of delay element where (m) is an integer larger than 2, thus, the number of tap weight coefficient means merely 1/m. The tap weight stored in the digital memory is determined by the position (n) of a tap, a delay time (?) of each delay element, the required delay expansion width (a), and the value of said integer (m) The obtained delay characteristic is sinusoidal in the given frequency band and as a result, this invention enables the decreased use of weighted taps as compared to the conventional art.

398914

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