SUTVBAND - time-variant bandpass filter (sine-squared taper)

sutvband <stdin >stdout tf= f=

Required parameters:
dt = (from header) time sampling interval (sec)
tf= times for which f-vector is specified
f=f1,f2,f3,f4 Corner frequencies corresponding to the
times in tf. Specify as many f= as
there are entries in tf.

The filters are applied in frequency domain.

Example:
sutvband <data tf=.2,1.5 f=10,12.5,40,50 f=10,12.5,30,40 | ...

Credits:
CWP: Jack, Ken

Trace header fields accessed: ns, dt, delrt