[sdiy] Digital noise generation

[Magnus Danielson]

From: Tim Ressel <madhun2001 at yahoo.com>
Subject: Re: [sdiy] Digital noise generation
Date: Tue, 8 Mar 2005 13:52:29 -0800 (PST)
Message-ID: <20050308215229.7936.qmail at web54603.mail.yahoo.com>

> 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.

Tim, read my sentense again. First of all I am talking amplitude distribution
and not frequency distribution. Also, I am saying that it is quantized with
discrete values, in amplitude distribution too.

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

Search for SIGSALLY and find out!

Cheers,
Magnus