[Stk] bow pressure units

[Perry Cook]

Hey Stephen,

Yes, bow pressure, and bow velocity, are normalized generally
so that the semi-normal operating range is around 0.5, depending
on pitch, the interaction of pressure/velocity, etc.  There was never
any attempt to calibrate those to physical units, but the way they are
used in the simulation means that would definitely have the proper
type of units (distance per second/sample, and force-like units, such
that those work out with the friction table).

PRC


On Aug 10, 2012, at 9:25 AM, Stephen Sinclair wrote:

> Hi,
> 
> I am going to write in a paper that the STK Bowed class specifies a
> bow pressure in normalized units.  It seems they are approximately
> between 0 and 1.  I'm not 100% sure if this is correct, so I thought I
> should just verify.  Does anyone know if the bow pressure, specified
> by Bowed::controlChange(), is translatable to physical units?
> 
> controlChange() seems to accept MIDI values, which it normalizes to
> 0--1 range.  I know the BowTable is a bit of an ad-hoc simulation of a
> transmission coefficient, so I'm not sure if it's based strictly on a
> physically-meaningful unit.  My impression is that it's really just a
> ratio of the supported range, which is unspecified.
> 
> (While I'm looking at Bowed documentation, by the way, I noticed that
> Bowed.h still mentions "breath pressure" instead of "bow velocity".)
> 
> thanks,
> Steve
> 
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