ahmilb@houu64$sudoc sufilter

In /hou/apps/gttgeo/ahmilb_new/su/releases_su/v33/SunOS/src/su/main:

SUFILTER - applies a zero-phase, sine-squared tapered filter

sufilter <stdin >stdout [optional parameters]

Required parameters:

if dt is not set in header, then dt is mandatory

Optional parameters:

f=f1,f2,... array of filter frequencies(HZ)

amps=a1,a2,... array of filter amplitudes

dt = (from header) time sampling interval (sec)

Defaults:f=.10*(nyquist),.15*(nyquist),.45*(nyquist),.50*(nyquist)

(nyquist calculated internally)

amps=0.,1.,...,1.,0. trapezoid-like bandpass filter

Examples of filters:

Bandpass: sufilter <data f=10,20,40,50 | ...

Bandreject: sufilter <data f=10,20,30,40 amps=1.,0.,0.,1. | ..

Lowpass: sufilter <data f=10,20,40,50 amps=1.,1.,0.,0. | ...

Highpass: sufilter <data f=10,20,40,50 amps=0.,0.,1.,1. | ...

Notch: sufilter <data f=10,12.5,35,50,60 amps=1.,.5,0.,.5,1. |..

Credits:

CWP: John Stockwell, Jack Cohen

Possible optimization: Do assignments instead of crmuls where

filter is 0.0.

Trace header fields accessed: ns, dt