Time-delay discriminator
First Claim
1. A method for determining the delay between two corresponding signals, the method comprising determining events at which the level of a first of the signals crosses a predetermined threshold, using each event to select a part of a second signal from which a sample is derived, determining a weighting factor associated with each event, weighting each sample according to the weighting factor associated with the event defining the sample, and combining the weighted samples to produce an output value and determining the delay from said output value.
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Abstract
A method of determining the delay between two corresponding noise-like signals comprises determining events at which the level of a first of the signal crosses a predetermined threshold, using each event to sample a second signal, combining the samples to produce an output value and determining the delay from the output value. Preferably, each sample is weighted according to one or more characteristics of the event used to define the sample. The magnitude of the output value could be an indication of the delay, or there could be several output values each for a respective differently-delayed version of the second signal, in which case these could be evaluated to select which corresponds to the actual delay.
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Citations
14 Claims
- 1. A method for determining the delay between two corresponding signals, the method comprising determining events at which the level of a first of the signals crosses a predetermined threshold, using each event to select a part of a second signal from which a sample is derived, determining a weighting factor associated with each event, weighting each sample according to the weighting factor associated with the event defining the sample, and combining the weighted samples to produce an output value and determining the delay from said output value.
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8. A method of determining the delay between two corresponding noise-like signals, the method comprising determining events at which the level of a first of the signal crosses a predetermined threshold, using each event to sample a second signal, combining the samples to produce an output value and determining the delay from the magnitude of the output value;
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wherein the events are defined by the crossing of one or more predetermined thresholds substantially different from the extreme values of the signal, whereby the output value changes monotonically as the delay changes over a range of interest. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification