[sdiy] Vote for your favorite noise source

[jorgen.bergfors at idg.se]

>If used for a source of random, I have not seen a difference.

Well, I have. Actually, this is where the results really differ.
For starters, there is a highpass cutoff frequency in most (all?) of them.
This is a problem if you want slow random modulation. Some noise generators
only cover the audio range.
The other problem is the random distribution. Some noise generators seems
to be oscillators that are modulated by the noise. This has the advantage
that the amplitude is always about the same. But the waveform isn't the
classic gaussian distribution. If you sample it with a traditional sample
and hold, you might not get what you want. This is the problem with the
Matrix 6 circuit.

I suspect that for really slow random modulations, the shift register
method is the only one that will be totally satisfactory.

/Jorgen