Declan Moriarty wrote:
> I did qualify the soundcard remark by saying "IF ...repeating waves" .
> Obviously they are pseudo random control sequences.
>> You need a front end for that thing. For instance, a pass of length X,
> by height Y, would need a specific sequence set. Add variations for the
> other control lines (whatever they signify), and a cpu will trot that
> table out fairly quickly. Even a pic running assembler would do that.
> But when you talk about tuning it up by hand, I feel there's more twists
> to this than I have a handle on.
Ah, come on, RTFP. We *have* the front end.
Okay, maybe I see what you're missing:
The short version:
This isn't nice tame digital logic here, it's wild hairy
mixed-signal stuff - the photons appear as tiny voltages, we have to
extract them carefully to somewhere else to convert to digital, but the
clock signals we send in to sequence the chip cause voltage ripples
across the chip that fsck up the readout itself. Advancing or retarding
those wavefronts can have a significant effect on quality, and this is
specific to a chip, and specific to temperature.
The short, *short* version:
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