[PD] Velocity detection

[Andrew Faraday]

Hey all

I've had an idea, using a joystick to symbolically strike a bell, (I.E. when one axis hits a certain figure the bell sound is triggered, possibly with the timbre varied by the other axis). However, does anyone know of a way I can measure the speed of this movement using pd? Basically, the change in velocity in the half second or so before reaching the 'strike'. 

I'm not sure if there's anything in PD to do this, but any ideas would be welcome. 

Cheers, 

Andrew
 		 	   		  
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