[sdiy] analog loses another niche

[Tim Ressel]

One fine day I got clever and hooked up a LFSR to an RF spectrum analyzer. I thought with averaging turned on I would see a straight line. Instead what I saw was a picket fence of peaks, or in RF parlance, a comb generator. With an 8-bit LFSR the peaks were quite pronounced, with a 16-bit they were so close together it was tough to see them, but they were there. Bottom line: digital noise really does sound different, unlike CDs that have been purified with flashing LEDs.

--TimR



----- Original Message ----
From: "jays at aracnet.com" <jays at aracnet.com>
To: Synth DIY <synth-diy at dropmix.xs4all.nl>
Sent: Wed, June 30, 2010 4:32:13 PM
Subject: Re: [sdiy] analog loses another niche

I wonder is an analog source any better than some form or combination of pseudo-random long length LFSRs?

Jay S.

Tom Corbitt wrote:

> http://spectrum.ieee.org/computing/hardware/intel-makes-a-digital-coin-toss=
> er-for-future-processors
> 
> =94Historically, RNGs have been analog,=94 says Greg Taylor, director of
> the Circuit Research Lab. =94But porting to smaller technology nodes
> [with analog devices] requires a lot of fine-tuning that is
> unnecessary with digital versions.=94
> 
> Be interesting to see how they rigged the metastability to be a 50/50 shot.
> 
> 
> Tom "And I, for one, welcome our new randomly digital overlords" Corbitt
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> Synth-diy at dropmix.xs4all.nl
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