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README.DOC
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1993-01-23
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DSP version 1.1 1/20/93
This is the latest update for DSP.PRG, the digital signal processing
program. It has been much improved over the previous version. Specifically:
1.) Bandpass and notch filters have been added. There's now a second
cutoff frequency specification for these two types of filters.
2.) A "builtin" sample playback feature has been added. It uses Dave
Baggetts QD_PLAY program, which is included in the download. There are two
PLAY buttons on the screen, one for playing the input sample and one for
playing the output sample. You must copy the play.prg program from the "play"
folder to the same folder that holds dsp.prg, otherwise the buttons will be
disabled and "grayed out". The "play" folder also contains the documentation
for play.prg as well as shareware info from Dave Baggetts Digistuff package
that is available on GEnie. Many thanks Dave!!
(Note, things run best when dsp.prg and play.prg are in a RAM disk.)
3.) The program resource file is now imbedded in dsp.prg. Thanks to
Alan Hamilton for RSC_TO_C.PRG, a resource to 'C' conversion program. Very
handy. I'm curious to know if the imbedded resource works OK on an Atari TT
computer. If anyone tries it, drop me a note.
4.) A graphic display of the filters frequency responce is shown in the
screens "filter" box. Not very detailed, but informative none the less.
5.) I've added a beep at the end of the filter create operation, just to
wake you up when those long 99 coefficient filters are done.
6.) The number of coefficients increment/decrement by 1 instead of 2. I
hope no one needs that kind of precision, but it's there if you do.
7.) A bug has been fixed in the processing section. This may have shown up
as a repetative click in some output samples. Thanks to my brother, Tracy,
for discovering this one on his "noisey" 1040ST.
8.) The code has been cleaned up and runs about 8% faster.
On the downside, all the filters that were saved with version 1.0 of DSP.PRG
are not compatable with this version. I had to expand the file header to
include info on BANDPASS and NOTCH filters, so version 1.1 will get
confused if you try to load a filter saved with version 1.0. (Technically
speaking the old filters will still work, but the screen will not update
correctly and I don't recommend you use them.)
That's about it. Let me know if you find any problems.
Keith Lord
Essex Junction, Vermont 05452
K.LORD on GEnie