NAME

     fxdecon  - do fx-domain deconvolution on seismic traces

SYNOPSIS

     fxdecon [ -Nntap ] [ -Ootap ] [ -Qqctap ]  [  -Dcardin  ]  [
     -dldsign  ]  [  -oloper  ]  [  -splsolvlp  ]  [  -wlwndw ] [
     -tpltovlp ] [ -flif1 ] [ -fhif2 ] [ -pwpw ] [  -mdmode  ]  [
     -imimute ] [ -pcpcnt ] [ -V ] [ -? ]

DESCRIPTION

     fxdecon implements noise reduction  via  spatial  predictive
     deconvolution in the complex frequency domain.  This program
     is a port of the MVS version.

     fxdecon gets both its data and its parameters  from  command
     line  arguments.  These arguments specify the input, output,
     the design windows, frequency limits, prewhitening, etc, and
     verbose printout, if desired.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N unless the input is from a pipe in which case
          the -N entry must be omitted.  This input  file  should
          include the complete path name if the file resides in a
          different directory.  Example -N/b/vsp/dummy tells  the
          program to look for file 'dummy' in directory '/b/vsp'.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after typing -O.  This output file is not required when
          piping the output to another process.  The output  data
          set also requires the full path name (see above).

     -Q qctap
          Enter the QC output data set name or  file  immediately
          after typing -Q (default = no QC output).

     -D cardin
          Enter the optional card input data  set  name  or  file
          immediately  after  typing  -D  (default = command line
          input).

     -d ldsign
          Enter  the  length  in  traces  of  the  design  window
          (default  =  15).   Keeping  this paramter fairly small
          will allow  the  operator  to  pass  steep  dips  while
          reducting  noise.  The upper limit is 101 traces. (This
          was increased from 25.  For  values  greater  than  25,
          prewhitening is strongly recommended.)


     -o loper
          Enter  the  operator  length  in  traces   (default   =
          ldsign/2).

     -sp lsolvlp
          Enter the spatial partition overlap in percent (default
          = 50%).

     -w lwndw
          Enter the length (ms) of  the  temporal  design  window
          (default = full trace).

     -tp ltovlp
          Enter the temporal window overlap in percent (default =
          50%).

     -fl, -fh if1, if2
          Enter the low cut and high cut  frequencies  (hz)  that
          best   define  the  suspected  signal  (defaults  =  0,
          nyquist).  Note:  allowing too wide a  frequency  range
          will result in almost all the output being put into the
          noise section.

     -pw pwel
          Enter the percent prewhitening (default = 0%).

     -md mode
          Enter 1 = record sequential, or  0  =  line  sequential
          (default = 0)

     -im imute
          Enter 1 = no preserve early mute;  0  =  restore  early
          mute.  Default = No.

     -pc pcnt
          Enter the percent of the input data to be added back to
          the output signal section (default = 0)

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -?   Enter the command line  argument  '-?'  to  get  online
          help.   The program terminates after the help screen is
          printed.

AUTHOR

     Richard Crider, ESS, Houston

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.