Back to school for me.
Mike
To: korgpolyex@yahoogroups.com
Sent: Mon, January 4, 2010 1:07:23 PM
Subject: Re: [korgpolyex] Random sample and hold - please explain
On Monday 04 January 2010, Michael Hawkins wrote:
> An alias that was the result of an infinitely low sampling rate
> would "resemble" noise.
>
> No?
No. It would resemble DC. :-)
If you're curious why this happens, the "natural" reconstructed signal
in this case lies between DC and the sampling frequency, which is
infinitesimally close to DC. You could reconstruct the signal alias
in any of the image bands as well, but then it would again be a
perfect sine since the bandwidth of the reconstruction filter has to
be infinitesimally small.
There have been several attempts at creating "true random" signals by
sampling from an ensemble of oscillators. None of them work
particularly well unless they're followed up by considerable digital
processing.
Achim.
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