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Re: [css3-speech] cue volume

From: Daniel Weck <daniel.weck@gmail.com>
Date: Tue, 2 Aug 2011 10:31:47 +0200
Cc: fantasai <fantasai.lists@inkedblade.net>, www-style@w3.org
Message-Id: <3C88B253-5D16-4D06-8E4E-0731DBBC8AD8@gmail.com>
To: Alan Gresley <alan@css-class.com>

On 2 Aug 2011, at 09:44, Alan Gresley wrote:
> When recording, you must adjust the input level so sound with a largest amplitude does not get distorted. To set the best input level, you must sample the range of amplitude of different sounds (ei a double base or trumpet compared to a triangle). This is what happens at a concert where they do a sound check.
> Playing back something is OK but an author can not know for sure how the sound will be replayed. One user could have there computer sound powered by a 500 watt external amplifier (stereo / surround system) where other users may be using a PC amplifier of 20 watts or headphones.
> Another variable that is more dangerous is the setting of the volume. A user may go from listening to a YT video to listening to some music on a CD or DVD and adjust the volume at a desirable level. The spec would want to have UAs not deafen someone (or cause hearing damage) due to this unknown variable.
> What is needed is something that plays sound at ever increasing levels until a level is reach that is desirable. This would have to be done over different octaves.

I agree with everything you say, but I am unsure about how this translates into normative requirements in CSS Speech (particularly, user-agent conformance requirements). Any suggestion? Thanks! Daniel
Received on Tuesday, 2 August 2011 08:32:37 UTC

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