bdif - BSU program which differentiates seismic traces using Bilinear Transform
bdif [ -h | infile | stab ]
Basic Seismic Utilities (BSU) differentiation program. The derivative wrt. time is computed with a bilinear transform estimate of the derivative. In the Z-plane there is a zero at Z=1 and a pole at Z= -1. A stability factor may be input to shift the pole slightly outside the unit circle. The new pole location is at Z= -(1+stab), where stab is the stability factor (often a value 0.1<stab<.5 can improve the signal to noise when significant noise content is at the nyquist.
Options
|
-h |
Online help giving details on command line arguments | ||
|
infile |
Input file name | ||
|
stab |
Stability factor (greater than zero moves pole outside unit circle). DO NOT PUT THE POLE INSIDE the unit circle. (HINT: with my sign convention, poles and zeros need to be outside for minimum phase. A pole inside the unit circle will be unstable). |
NOTE:
If invoked with no options, will prompt user for input
parameters.
EXAMPLE:
bdif twav.seg .1
Traces in file twav.seg are differentiated with respect to time. A stability factor of 0.1 is used to shift the pole away from the nyquist ( -1.0 in the Z-plane).
bdifxxxx.seg
Named according to convention (first 4char bdif, the next 4char are the first 4char of the input file name, suffix .seg)
standard output
produces a progress bar
bdifxxxx.lst
echo check of input parameters
bhelp(1), bint(1), bsegy(5)
No known bugs
Copyright © 2017 by Paul Michaels
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
P. Michaels, PE. <pm@cgiss.boisestate.edu>