Bi-directional low pass filtering method and apparatus

Details Bi-directional low pass filtering method and apparatus Bi-directional low pass filtering method and apparatus

1996-12-12

1998-11-24

Ghebretinsae, Temesghen

Pulse or digital communications

Receivers

Interference or noise reduction

36472401, 455307, H04B 110

Patent

active

058418210

ABSTRACT:
The present invention provides a bi-directional low pass filtering method and apparatus for attenuating out-of-baseband components of data transmitted from an encoder to a decoder over a transmission medium. In one embodiment of the present invention, the bi-directional low pass filtering apparatus includes a Chebyshev filter that has a first phase response. This Chebyshev filter is coupled to a phase correction circuit, which has a second phase response. This second phase response of the phase correction circuit is designed to oppose the first phase response in order to offset variations in group delay in the data due to the Chebyshev filter.

REFERENCES:
patent: 4802234 (1989-01-01), Tatomir
patent: 4884036 (1989-11-01), Koyama et al.
patent: 4994693 (1991-02-01), Popescu
patent: 5006810 (1991-04-01), Popescu
"Linear Phase Filter Design on time domain basis" Philobos et al. IEEE 1981 vol. 69 No. 7 pp. 836-837, Jul. 1981.
Proceedings Of The IEEE, "Linear Phase Filter Design on a Time-Domain Basis", vol. 69, No. 7, (Jul. 1981), pp. 836-837.

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