Commit bef3db97 authored by thomas.forbriger's avatar thomas.forbriger

libstfiv [WP][DOC]: add note regarding implicit periodicity

parent cd8efec8
......@@ -41,10 +41,11 @@ A time domain taper can be applied to the impulse response of the correction
filter by using option irtap. Four time values are given in units of seconds:
t1, t2, t3, and t4. They must be in increasing order and (t4-t1) must be
smaller than the total duration of the time series used to represent signals
internally. Time value are allowed to be negative. Prior to application of the
correction filter to the time series passed to the algorithm, the correction
filter is transformed to the time domain, tapered, and then transformed to the
Fourier domain again. The values of the taper are:
internally. Times value are allowed to be negative. Time series are understood
to be periodic (due to discrete Fourier transformation). Prior to application
of the correction filter to the time series passed to the algorithm, the
correction filter is transformed to the time domain, tapered, and then
transformed to the Fourier domain again. The values of the taper are:
0 if t < t1
0.5-0.5*cos(pi*(t-t1)/(t2-t1)) if t1 <= t <= t2
1 if t2 < t < t3
......
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