Comb filter including a data overflow monitor, and a radio including the same
US5227991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1991 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Nov 20, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0251
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A monitor (102) is suitable for monitoring the data integrity of a comb filter (101). Generally, the filter will include at least one differencer stage, at least one buffer stage, and at least one integrator stage, including an output integrator stage (500). The output integrator stage will include a most-significant input bit (150) ("I"), a most-significant output bit (130) ("O"), and a carry bit (140) ("C"). In one embodiment, the monitor includes a detector (600) for detecting an overflow condition in the filter based on the equation (inverse C) * (O) * (I)+(C) * (inverse O) * (inverse I). The monitor also includes a waveform generator (700) that, in response to the occurrence of an overflow condition, generates a resetting waveform (170) of a predetermined shape and time duration, that is then coupled to the resetting terminals of all stages in the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.