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Re: [css3-speech] voice-pitch and voice-pitch-range computed values

From: fantasai <fantasai.lists@inkedblade.net>
Date: Mon, 18 Jul 2011 16:11:09 -0700
Message-ID: <4E24BD8D.6050505@inkedblade.net>
To: www-style@w3.org
On 07/13/2011 02:13 PM, fantasai wrote:
> an absolute frequency OR a keyword value and potentially also
> a frequency, semitone, and/or percentage representing any non-zero
> offsets
> Basically, if the base is an absolute frequency, rather than a keyword,
> then we can just perform the calculations and come up with the Hertz.
> That will be the computed value.
> If the base is a keyword, then we need to preserve that keyword together
> with the offset. We can't represent the offset as Hz alone, because
> the number of Hz corresponding to a semitone or a percent depends on
> what the base frequency is -- which we can't compute right now, because
> we don't know it, we only know the keyword name.
> Kinda messy, huh?

So it occurs to me that the offsets, because they're computed differently
at different base values, can't be represented just as a tuple. You'd
have to represent them as a list, because
   medium + 2st + 200Hz + 2st != medium + 4st + 200Hz

This seems excessively complicated, so I'm wondering if maybe we should
have the computed value be either
   * a keyword if only the keyword is specified by itself, otherwise
   * a fixed frequency calculated by converting the keyword value (if any)
     to a frequency based on the voice-family and applying any other
     additions and subtractions

This means that if you're using anything other than a bare keyword,
the frequency will inherit absolutely through a voice change, but
if you're only using a keyword, the frequency will recalculate on
a voice change.

Would that be sufficient?

Received on Monday, 18 July 2011 23:11:40 UTC

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