NAME

     fxbl  - perform time variant spatial balancing of  amplitude
     spectra

SYNOPSIS

     fxbl [ -Nntap ] [ -Ootap ] [ -didezin  ]  [  -spixovlp  ]  [
     -wiwndw  ]  [ -tpiwnovlp ] [ -mdmode ] [ -rplramp ] [ -S ] [
     -? ] [ -H ]

DESCRIPTION

     fxbl computes the geometric mean of the amplitude spectra of
     all  traces  within a record. It is very similar to spbl but
     is much simpler to use and is time variant. It processes all
     the data however unlike spbl which can limit its processing.
     The amplitude spectrum of each output trace is scaled to the
     average spectrum in a zero-phase manner.  The effect of this
     scaling  is  to  significantly  attenuate  both  random  and
     coherent  noise,  such as ground roll, when the frequency of
     the noise is anomalous relative to the mean spectrum.

     fxbl gets both its data and  parameters  from  command  line
     arguments.   These  arguments specify the input, output, and
     the spectral averaging parameters.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N.  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 'vsp' stored on the 'b' disk.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after typing -O.  The output data set also requires the
          full path name (see above).

     -d idezin
          Enter the length in traces of the  spatial  design  and
          application window.  Default is the whole input record.

     -sp ixovlp
          Enter the  percent  overlap  of  the  spatial  windows.
          Default is 50%

     -w iwndw
          Enter the length in  ms  of  the  temporal  design  and
          application window.  Default is the entire trace.

     -tp iwnovlp
          Enter the percent  overlap  of  the  temporal  windows.
          Default is 50%

     -md mode
          Enter the mode of application: 0 = line sequential; 1 =
          record  sequential.   Line sequential means essentially
          stacked data of single trace records; record sequential
          means unstacked data.

     -rp lramp
          Enter the length in ms of the  on-mute  restored  mute.
          Default = 48ms

     -S preserve scaling
          Enter this parameter to request preservation  of  scal-
          ing.   Data  output  with  this  option  in effect more
          closely resemble the input  in  relative  scaling  with
          little  or  no detrimental effect on the noise attenua-
          tion of the process.  Default is No.

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

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

AUTHOR

        Richard Crider ES&S  Houston

COPYRIGHT

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