Richard Ottosen <rottosen@idcomm.com> wrote:

> These shift register/XOR feedback PRNG's work well for making what
> sounds like noise to the ears. If you feed the bits to a digital to
> analog convertor and look at the result on a scope, the waveform
> looks like a bunch of exponential curves. To the eyes this appears
> very non-random.

    And then there are those waveforms which look EXTREMELY random on
    a scope... But when you listen to them, you discover that they're
    recordings of Beethoven's symphonies.  To make the visual
    representation match your ears' perception of the waveforms, you
    really have to look at the data not on an oscilloscope, but on a
    spectrum analyzer.

    -Andy


=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - San Diego, California
=== http://www.geocities.com/SiliconValley/2499