[sdiy] Uniformly distributed noise generator?

cheater00 . cheater00 at gmail.com
Mon Jun 10 14:17:00 CEST 2013


Richie,
very interesting, I didn't know that casting had those properties!

Cheers,
D.

On Mon, Jun 10, 2013 at 2:06 PM,  <rburnett at richieburnett.co.uk> wrote:
>> ...But I wonder if there isn't a specific circuit that inherently creates
>>
>> uniformly distributed noise, similar to how we get white noise via the
>> inherent properties of what ever semiconductor is used. I have a
>> feeling something like this must exist, after all it's a basic concept
>> in statistics, and a lot of stats got done on analog computers for
>> many decades.
>
>
> You want something analogue that inherently generates an even distribution
> of amplitudes between two rigid limits, and then NOTHING outside these
> limits?  That sort of distribution doesn't sound like an inherently natural
> behaviour to me.
>
> BTW.  This paper from Jon Dattorro contains an interesting section on
> digital generation of noise:
>
> https://ccrma.stanford.edu/~dattorro/EffectDesignPart3.pdf
>
> It's a great paper in general, but section 8 is on noise generation in
> particular.  He discusses the audible repetitions (chuffing train) that
> occur with short-length LFSR implementations, and offers a selection of
> various length generator polynomials (LFSR tap choices.)  He also points out
> that a single bit from the LFSR gives spectrally white 1-bit noise, but
> explains why casting larger parts of the shift register into say a 16-bit
> signed word can result in noise that is no longer spectrally flat.  The
> spectrum can then be corrected by a simple "whitening" filter.
>
> -Richie,
>
> PS. For those interested in DSP audio/music, all three of those Dattorro
> papers are worth grabbing and stashing for reference.
>
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