Tom Henry Tunable Noise Source

Magnus Danielson cfmd at swipnet.se
Wed Nov 17 04:47:29 CET 1999


From: "jhaible" <jhaible at debitel.net>
Subject: Re: Tom Henry Tunable Noise Source
Date: Tue, 16 Nov 1999 21:19:09 +0100

> > Could AM of banlimited noise be interesting ,too?
> >
> > Maybe the effect of FM /AM would be quite similar, due to the
> > flat spectra.
> >
> > The FM has something, because there should be no dc offset problem
> > at the output, whereas the multiplier could suffer from this.
> 
> Speaking of noise, I never was that good at statistics, so I have a few
> burning questions:
> 
> (1) How does the spectrum on white noise change when it is hard
>       limited (clipped) ?
> 
> (2) What is the spectrum of a sine oscillator modulated (FM) by white noise
> ?
> 
> (3) How is the pattern (distribution ?) of a Sample and Hold changed when
>       you're sampling a white-noise-FMed VCO instead of sampling the noise
>       directly ?
> 
> (4) How is the pattern of a Sample and Hold changed when
>       you're sampling a triangle-VCO-PLL with white noise as input to the
>       PLL ?

Juergen, have anyone told you recently that you got a sick mind? ;)

These questions seems to me a bit bizzare except for (2) which is kind of
technical valid in a sence. (1) is also quite valid. (3) and (4) are kind of
odd really...

> Ok, I have some vague guesses for each case, but I'd like to know for
> certain.

Cheers,
Magnus



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