     SbFFT version 1.2, a program for spectral display and filtering using
Sound Blaster audio cards.  COPYRIGHTED FREEWARE.



     SbFFT is a spectral display and filtering program for use in Amateur Radio
and audiophile applications.  It's features include:

*    Sound Blaster 16 (or 100% compatible) input and output.

*    Band widths of 2K, 4K, 8K or 16K Hz.

*    Spectral resolutions of 1 Hz to 16 Hz per pixel.

*    Display of power spectral density with any of 4 color maps in either
     linear or logarithmic scale.

*    Define and use up to six filters simultaneously -- band pass, band stop,
     low pass, and high pass.  Filters have 25 Hz skirts, 3 to 50 dB.

*    Filters are defined graphically by mouse movement.

*    Net filter passband is displayed at all times.

*    CDROM and line SB 16 inputs

*    .wav file inputs and outputs

*   Filters can be selectively enabled and disabled by a single keystroke.
    This allows for quick reconfiguration in case of changing conditions, etc.


     Please read the file manual.txt at least through the alphabetical list of
commands before running this program.



REQUIREMENTS (see manual.txt for full explanation):

SB 16 or 100% compatible, DOS 3.0 or higher, mouse,
minimum 486/66, Pentium recommended,
SVGA, VESA 640x480 & 1024x768 resolutions, 380K free RAM.



DIFFERENCES FROM VERSION 1.1

1)   The SbFFT program has been built with a smarter graphics library.
     It should now operate with a much wider range of VESA SVGA cards.

2)   The AGC algorithm has been enhanced.

3)   Defaults have been assumed for the BLASTER environment variable.  If the
     variable is set in your system, whatever information it contains will
     be merged in with the default values.  See Installation, below.

4)   An interrupt conflict between the MPU401 and the A/D converter on the
     Sound Blaster has been eliminated.  Because of this comflict, SbFFT would
     start and terminate normally but would not display spectra on some sytems.

5)   SbFFT now generates pcx files instead of tiff files.  The pcx files are
     a fraction of the size of tiff files.  Also, the graphics library that
     generated the tiff files failed to initialize the tiff header completely,
     causing some graphics viewer programs to crash.

6)   Improved mouse response at fine resolutions.

7)   Full screen mouse movement to make filter definition easier.

8)   Filters may be enabled/disabled or deleted by mouse clicking in the
     filter active band.

9)   Numerous typographical errors have been eliminated from the manual.



INSTALLATION

1)   create a directory C:\SBFFT

2)   copy the .zip file to the directory C:\SBFFT

3)   Unzip the .zip file.  You should find files:

     SBFFT.EXE
     SBFFT.PIF
     MANUAL.TXT
     README.TXT
     FIGURE1.JPG
     FIGURE2.JPG
     FIGURE3.JPG
     FIGURE4.JPG
     FIGURE5.JPG
     FIG6-9.JPG
     FIG10-13.JPG
     FIGURE14.JPG
     FIGURE15.JPG
     RS-12.WAV
     WNU31.WAV


4)   Make sure the Sound Blaster card is installed and functional

5)   Insure that the BLASTER environment variable is set.  If necessary, put
     into the autoexec.bat file on the boot drive a command of the form


SET BLASTER=Aaaa Iii Dd Hh Pyyy

     where aaa = base address of the SB 16 card (usually 220)
          ii =  number of free interrupt, i.e., one not used by another device
          d  =  8-bit DMA channel (usually 1)
          h  =  16-bit dma channel (usually 5)
         yyy =  MPU401 (MIDI) address (usually 330)

     For more information, see the Sound Blaster documentation

6)   uninstall or disable screensavers

7)   SBFFT.EXE is ready to run

8)   as a minimum, read the sections 'Screen Display' and 'Alphabetical list of
     commands' below before you run the program

9)   for a quick test, if you have a CDROM attached to your Sound Blaster,
     start an audio CDROM playing with a DOS CDROM player and run the program.
     Alternately, you can play the rs-12.wav file included with
     this package.  Type 'B' 3 times to put SbFFT into 2K Bandwidth. Then type
     'P' and when a file name is requested, type 'rs-12'<Enter>, without
     the quotes.




COPYRIGHT

     The program code, manual file, and associated graphics figures are
Copyright (C) 1996 by Kevin J. McWilliams, KW5Q.  All rights are reserved.


LICENSE

     This program and associated files are COPYRIGHTED FREEWARE.  They may be
freely distributed so long as they are distributed in their entirety, are not
modified in any way whatsoever, and no charge is made for the copyrighted
material.  A maximum charge of $3 (three dollars U.S.) may be assessed for the
duplication of these materials.




     Your comments are welcome.

     email the author Kevin KW5Q at kevinm@mail.eden.com.

     Enjoy, and 73's -- KW5Q
