[sdiy] Digital noise generation

[Tim Ressel]

Yo,

--- Magnus Danielson <cfmd at bredband.net> wrote:
 
> A typical pseudo-random noise source has an evenly
> spreat amplitude
> distribution. Any particular value is equally
> probable. 

Not quite accurate. The distribution is equally
spaced, but not all values are represented. A PRN
noise source generates energy in equally-spaced
frequency buckets, kinda the opposite of an FFT. If
you take an 8-bit shift register noise gennie and hook
it to a spectrum analyzer, you can see a picket-fence
of energy spikes. This is one reason for using a
really big shift register and fast clock.

Question: can one make a noise gennie out of a vacuum
tube? 

--TimR


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