Cross-correlation apparatus and methods
First Claim
1. Apparatus for processing a first signal and a second signal, the second signal representing information delayed in time with respect to corresponding information represented by the first signal, and there being included in each signal a common mode interference signal, the apparatus comprising correlating means for generating first data suitable for producing a positive time correlation curve from the first and second signals and second data suitable for producing the equivalent of a negative time correlation curve from the two signals or an autocorrelation curve from one of the two signals, there being included in the first and second data common data which results from the common mode interference signals, and a means for subtracting one of the first and second data from the other of the first and second data, whereby the data resulting from the the said common mode interference signals is removed or reduced.
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Accused Products
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 lengthwise of the direction of travel.
14 Citations
6 Claims
- 1. Apparatus for processing a first signal and a second signal, the second signal representing information delayed in time with respect to corresponding information represented by the first signal, and there being included in each signal a common mode interference signal, the apparatus comprising correlating means for generating first data suitable for producing a positive time correlation curve from the first and second signals and second data suitable for producing the equivalent of a negative time correlation curve from the two signals or an autocorrelation curve from one of the two signals, there being included in the first and second data common data which results from the common mode interference signals, and a means for subtracting one of the first and second data from the other of the first and second data, whereby the data resulting from the the said common mode interference signals is removed or reduced.
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6. A method for processing a first signal and a second signal, the second signal representing information delayed in time with respect to corresponding information represented by the first signal, and there being included in each signal a common mode interference signal, the method comprising generating first data suitable for producing a positive time correlation curve from the first and second signals, generating second data suitable for producing the equivalent of a negative time correlation curve from the two signals or an autocorrelation curve from one of the two signals, there being included in the first and and second data common data which results from the common mode interference signals, and substracting one of the first and second data from the other of the first and second data, whereby the data resulting from the said common mode interference signals is removed or reduced.
Specification