> If you are planning on using a "regular" hobby servo for the 
> Jaw then I imagine you will hit some snags with resolution.
> Essentially, the servo protocol is a PWM signal with only 60 
> pulses per second. 

60 updates per second is good enough for my purposes. 

> Remember that the duration of the pulse in the signal only indicates 
> where the servo should move to, and not how fast it should move. 

I understand, the speed of the servo is constant. I was planning 
on having it simulate a slower or faster rate by giving it a specified
distance to move from the current point, so a rate in this case
of the number of locations it should move to to get from point A to 
point B. A loud sound might only have 1 location to move to (far away), were a softer sound might have 5 locations along the way that the 
servo is instructed to move to (closer). Since the later takes a 
longer period of time, the servo will move slower to the final 
location versus the loud sound which will move quicker. 

> Anyways, I am thinking that your limitation will be with the servo 
> rather than with the sampling rates and signal levels of the audio.

Oh I have no doubt that the servo is the weakest link in this 
plan, but its cheap, small, and fits well in a skull. I believe 
creating this circuit will create as realistic a mouth movement 
as possible despite the servos limitations. 


Thanks, 
Mike

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