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FFTSCOPE.DOC
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1994-05-30
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2KB
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45 lines
The Program use the following Keys:
------------------------------------------------------------------
0123456789*/ select MODE (look for some Hidden Modes...)
ENTER Spezial-Effects (freeze Scope / Visual Effects)
+ - change Triggerbuffersize/FFT-Volume/Samplerate
------------------------------------------------------------------
The Program use no Interrupts, but the Soundblaster_DMA must be 1.
and the Soundblaster Adress must be 220h ! (SB 2.0 default Values)
The Programs work with Cards they are only Software-compatible to
Soundblaster 2.0 or Soundblaster PRO (The Mixer is not supported)
Soundblaster 1.0 4kHz ... 12kHz Samplerate
Soundblaster 2.0 4kHz ... 15kHz Samplerate
SoundGalaxy BX II 4kHz ... 26kHz Samplerate
Soundblaster Pro 4kHz ... 44kHz Samplerate
Mega-Blaster 16 4kHz ... 48kHz Samplerate
The Program use only 8-Bit mono Modes of the Soundcards,
please send me Programming-Info for 16-Bit Soundcards...
I put the complete C-Program (Borland C/C++) to this Archive,
so that you can create better Versions of my Program!
If you do so, please send me your Version !!!
please note that the maximal-Freqency is Samplerate/2 (Nyquist).
Samplerate over 14999 use Highspeed_Soundblaster_DMA_mode,
not all Software compatible Soundcards support this Mode!
for Visual Effects/Home-Disco use 4kHz Samplerate (it's Better!)
the FFT-Analysator display Amplitude and Freqency linear.
the FT-Analysator display Amplitude linear and Freqency logarithmic.
The FT-Analysator is very slow because FT is slower then FFT!
Spezial Features of the FT-SCOPE.EXE Program:
----------------------------------------------
Displaying more TECHNICAL Information (and better Colors) in the Main-Menu!
changing the Samplerate in the Main-Menu with the '+' and '-' Keys.
'Enter' / 'Space' Starts/Stops Trigger-Oszilloscope or switch Window on/off.
(Window is a Funktion to make the Spektrallines more correctly!)
Mode '0' is not list in Main-Menu, it is a 2048 Point FFT, so you can
never see the complete Spectrum, use the Cursorkeys to scroll it!