On Mon, 2006-05-22 at 21:39 +0200, Ronan Cunniffe wrote:
> Declan Moriarty wrote:
> Soundca.... wha?! (Ok, I shouldn't be rude, this is why Google wasn't
> any help earlier.)
>> Nope. Logic levels. High/Low. Perhaps it's my fault for not
> explaining precisely what I'm at.
>> We have an IR detector (roughly equiv. to a CCD), controlled by 6 clock
> lines. In order to read out/reset/skip rows/whatever, we need to feed
> those switches with the right the sequence. The grunt work is all
> handled by a controller - we just load the right tables and poke the DSP
> to get going. It then eats one state every 50 nsecs.
>> So, everything is fine, and all of the above actually works. But this
> is a camera for astronomy, and performance is insanely important. Once
> we take delivery, we'll remove the POS detector we let them have for
> testing, put in The Real One, and start tuning it up to 11. That's what
> I don't want to be doing by hand.
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.
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