[Stk] bow pressure units

[Stephen Sinclair]

Thanks!

On Fri, Aug 10, 2012 at 1:48 PM, Perry Cook <prc at cs.princeton.edu> wrote:
> 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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