Frequency measurement
US5019823A · kind A · utility
7Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Dec 5, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring the frequency of an input signal is described. The apparatus uses a quadrature sampling system to obtain values of the instantaneous phase of the signals at a succession of time intervals, the values being converted into cumulative phase values. An estimate of the frequency is obtained by determining the gradient of the straight line which would best pass through a plot of the values of cumulative phase against time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.