Cross-correlation apparatus and methods
US5029481A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1989 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Jul 21, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/803
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus and method for processing first and second signals, the second signal representing information which is delayed in time with respect to correspoonding information represented by the first signal and there being included in the information represented by each signal information which represents a common effect, occurring at the same time, in each of the two signals. The apparatus includes correlating means which generate first data suitable for producing a positive time correlation curve from the two signals and second data suitable for producing the equivalent of a negative time correlation curve from the two signals or an autocorrelation curve from either one of the two signals. The information representing the common effect results in data common to both first and second data. One of the first and second data is therefore subtracted from the other, thereby removing or substantially reducing the information representing the common effect. The apparatus and method are particularly suited for measuring the speed of travel of a cable in a cable making machine, where lateral movements of the cable away from its desired path produce a common effect on sensors spaced length…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.