Dictionary:Time variable (TV)

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Describing an operation in which the parameters vary with record time, as in ‘‘time-variant filtering.’’ Usually, time-variable processes are implemented by determining parameters over several fairly long portions of a trace at different times in a time-invariant manner, processing the data twice using the two sets of parameters, and then blending the two results together over some time interval (merge zone) by varying the mix of the two results; ramping.