[sdiy] Velocity/Position sensing

[harrybissell at wowway.com]

Piezos sense high frequencies best... to do an X-Y position with them
would probably require a hard surface like metal, or glass etc which
would transmit a surface wave well. Fabrics would damp the high frequencies
and probably not work well.  You need to damp out the previous note hit before
the next one... quirky trade-off there.  It you hit a hard surface with drum
sticks it would be easy... soft surface with hands is really tough ! (imho)

H^) harry




On Thu, 2 Oct 2008 09:21:29 +0000, Justin Owen wrote
> ---- Kyle Stephens <lightburnx at yahoo.com> wrote: 
> > I must have deleted it, but I swore something like this (velocity, or at
least position sensitive pads, of Japanese
> > manufacture if I recall) was discussed on the list a while ago...
> 
> -----Original Message-----
> From: jvastine [jvastine at charter.net]
> Received: 02.10.2008 01:29:45
> To: Synth-DIY
> Subject: Re: [sdiy] Velocity/Position sensing
> 
> >>...are you sure that wasn't force sensing resistors was what was mentioned
in a similar thread? I could be mistaken 
> >> here, but isn't it possible to use force sensing resistors in an
application of this type?
> 
> >>jvastine
> 



> I did look back through the archives  - there was a conversation 
> about those curious QTC pills but nothing I could find about 
> 'position sensitive pads'. No bother.
> 
> The various 'force sensing resistors'  on the market now are 
> definitely an option - but right now I'm looking at just using 
> piezos and coming up with interesting ways to mix/differentiate the 
> voltages they produce to try and emulate 'position'.
> 
> As always - the replies I got have given me *loads* of food for 
> thought and some good places to start researching.
> 
> Thanks to everyone.
> 
> Justin
> 
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Harry Bissell & Nora Abdullah 4eva