[sdiy] Ensoniq patent, was: distance meter for keyboard, was: Where to get special white keys?

[cheater cheater]

You don't really need an additional contact.
Just tell the user not to touch the keyboard when calibrating... like
the SQ-80 does!
DON'T TOUCH KEYBOARD << SQ80 does it like this. I love it.
but it could be useful, indeed.
now the question is whether temperature can change the *linearity*.
That's more important, I think. That's also a reason why I had
thoughts about an optical sensor.
Optical mice use cheap optical sensors... you can have a mouse like
that for 5 dollars, can't you? And that's including all the other crap
they put in em :) You'd also need a focused laser beam... no idea how
much those could be.

Optical sensors don't work that well in smoky rooms though... so no
jarre fog i guess? This definitely disqualifies optical technology for
some people ;)

On Mon, Mar 2, 2009 at 2:42 PM, ChristianH <chris at chrismusic.de> wrote:
> On Mon, 02 Mar 2009 07:31:06 -0700 Ian Fritz <ijfritz at comcast.net> wrote:
>
>> At 11:52 PM 3/1/2009, Simon Brouwer wrote:
>>
>> >Have you looked at the spec sheet on that page? Although not particularly
>> >linear, these appear to be analog sensors.
>>
>> Ooops!  Right you are.  I got confused by the Futurlec description.  These
>> might be worth looking into further.  One thing to be careful about is
>> whether they have temperature compensation.
>>
>> Ian
>
>
> I don't know about temperature characteristics in this case, but a
> simple offset could be compensated by measuring the all-notes-off values.
>
> If there *is* an additional key contact, that is.
>
> Christian
>
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