Programmable digital filter for stable interval detection

Details Programmable digital filter for stable interval detection Programmable digital filter for stable interval detection

1996-05-15

1998-12-08

Beausoliel, Jr., Robert W.

Excavating

371 471, 371 48, 371 61, G06F 1300

Patent

active

058482377

ABSTRACT:
A programmable digital filter. The digital filter detects a predefined pattern over a programmably variable duration. The filter includes an interval register which is coupled to receive an interval count. A sample register is coupled to receive a plurality of samples of an input signal which is sampled at an interval determined by the interval count. A plurality of pattern matching circuits generate a pattern match output if the plurality of samples matches one of a plurality of predetermined patterns, and a state logic circuit generates a signal if a new match is found. The pattern matching circuits may be stable high and stable low test circuits which cooperate to determine if all of the plurality of samples are of a consistent logic value.

REFERENCES:
patent: 3626298 (1971-12-01), Paine
patent: 4137532 (1979-01-01), Taylor et al.
patent: 5068813 (1991-11-01), Thoen
patent: 5450452 (1995-09-01), Kakuishi et al.
patent: 5719580 (1998-02-01), Core

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