Mouintan Wiev Phase accumulator

[Grant Richter]

>     But, I am attempting to resist the Digital Demon....he will not sway me
> from the true path of analog....
>

Putting on Pontiff hat...

Just as electronics itself is a subset of chemistry,
"digital electronics" is just an overblown methodology that exists
as a subset of analog electronics.

Any device that uses a voltage is always analog,
or more correctly "analogue", to some real world
process that is being modeled, and bits are usually
represented by voltages or magnetic fields which
are inherently analog.

For some reason Universities have chosen to ignore
this fact and teach "digital" as if it existed in
some perfect mathematical universe. You could sort of
say that the concept of "digital" is a consensual
hallucination.

I think what you really mean is using continuous time
computing circuitry instead of discrete time computing
circuitry, which has been proven to have perceptual
advantages for audio.

The process of "sampling" is a modulation process
that produces sum and difference frequencies just
like ring modulation. If you sample a 21Khz signal
at 40Khz you produce a 61Khz artifact and a 19Khz
artifact. So at more than half the sampling rate,
the spectrum is reflected into the bandwidth of interest.

You can prove this to yourself using an "analog"
sample and hold with an external clock input
(like an ARP 2600). Sample an audio signal
at an audio rate and notice the similarity to
ring modulation.

I have been experimenting with event driven sampling
using flash converters. Since a flash converter
has no clock signal to heterodyne against, the primary
"pollutants" are quantization noise, and an event
"clock" can be derived from a parity tree of all
the ADC bit outputs.

The question is: Is this actually "unsampled" digitization
or is it simply pushing the sampling rate up to the
slew rate of the flash converter?

Removing Pontiff hat....