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Re: [css3-speech] voice-pitch

From: Daniel Weck <daniel.weck@gmail.com>
Date: Wed, 13 Jul 2011 21:02:41 +0100
Message-Id: <5E392EB7-4996-46DD-B72C-040F73D43474@gmail.com>
To: www style <www-style@w3.org>, fantasai <fantasai.lists@inkedblade.net>

On 13 Jul 2011, at 20:28, fantasai wrote:
>> I would expect a speech engine to support a specific range of admissible
>> frequencies, and to gracefully handle "awkward"  values such as 0Hz.
> You should specify this explicitly -- that there may be UA-specific limits
> on the frequency and that UAs must clamp out-of-range actual (as opposed to
> used or computed) values to this range.

What about this?

Speech-capable user agents are likely to support a specific range of values rather than the full range of possible computed numerical values for frequencies. The actual values in user agents may therefore be clamped to implementation-dependent minimum and maximum boundaries. For example: although the 0Hz frequency can be legitimately computed, it may be clamped to a more meaningful value in the context of the speech synthesizer.

and for computed values:

Computed absolute frequency values that are negative are clamped to zero Hertz.

Author-provided values are handled slightly differently:

When a negative value is provided, it is clamped to zero.

Received on Wednesday, 13 July 2011 20:03:20 UTC

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