System and method for filtering echo/NEXT signal interferrence

Details System and method for filtering echo/NEXT signal interferrence System and method for filtering echo/NEXT signal interferrence

2005-05-24

2005-05-24

Nguyen, Duc (Department: 2643)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406080, C370S286000

Reexamination Certificate

active

06898281

ABSTRACT:
A system and method for echo and near end cross talk (E/N) cancellation in a communications system using a pair of FIR filter ICs, wherein a first FIR filter IC filters a plurality of low amplitude E/N signals and a first portion of a plurality of data bits of a plurality of high amplitude E/N signals, and a second FIR filter IC filters a second portion of the data bits of the high amplitude E/N signals which cannot be filtered by the first FIR filter IC. The output values from the two filters are then summed to produce the E/N cancellation signal. The present invention allows for the use of lower bit-resolution, lower power consumption, and less expensive filter ICs than conventional FIR filters implemented in a single IC.

REFERENCES:
patent: 5053984 (1991-10-01), Cavallotti et al.
patent: 5570423 (1996-10-01), Walker et al.
patent: 5594677 (1997-01-01), Golla et al.
patent: 5664011 (1997-09-01), Crochiere et al.
patent: 5724395 (1998-03-01), Golla et al.
patent: 6260053 (2001-07-01), Maulik et al.

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