Time period measuring apparatus with adaptive averaging
US4995019A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jun 6, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F10/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An adaptive time period measurement technique which provides full speed for every measurement period with increased resolution afforded from repeated measurements. The time measure is produced by adaptively filtering a number of prior time measures. Each measurement includes a count and a fractional part from a controlled variable delay interposed in the measurement system. This variable delay is controlled over a number of measurements to cover the entire range of one clock cycle, preferably in accordance with a reversed binary progression algorithm. The adaptive filtering is preferably a self-modifying, classic low pass filter with a roll off which depends on the rate of change and direction of change of the measurerd time period. Thus the present invention provides all the resolution feasible based upon the rate of change of the measured quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.