Programmable digital filter for stable interval detection
US5848237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1996 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | May 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0294
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.