W3C home > Mailing lists > Public > wai-xtech@w3.org > July 2007

Re: reCAPTCHA: audio alternatives and audio formats

From: David Poehlman <poehlman1@comcast.net>
Date: Tue, 17 Jul 2007 13:07:29 -0400
Cc: wai-xtech@w3.org, Ben Maurer <bmaurer@andrew.cmu.edu>, Al Gilman <Alfred.S.Gilman@IEEE.org>, Colin McMillen <mcmillen@cs.cmu.edu>
Message-Id: <8515FFD7-A237-4146-B380-0E01CB36AA53@comcast.net>
To: Gregory J. Rosmaita <oedipus@hicom.net>

I think but am not certain that .wav is the most widely used.

On Jul 17, 2007, at 12:03 PM, Gregory J. Rosmaita wrote:

aloha, all!

concerning the cascade of aural CAPTCHA equivalents, i have pondered
the issue of baseline audio formats for quite some time, but can't
find the post i was preparing on the topic, so i'll just simply ask:
what is the cascade order for aural filetypes in the real world


1) is .au the baseline for web delivered audio content?

2) is .ogg widely enough supported to retain first place in the cascade?

3) are there any widely supported (read old) filetypes that are not
included in the cascade order listed above?

4) are .mp3 files capable of being played using the user agent or
operating system's default sound renderer?

5) is this the same cascade that should be provided for aural slash
speech CSS, versions 2.0 through 3.0?

gez, does WCAG2 advise content providers to provide a cascade of sound
formats, so that everyone will be able to play them without invoking a
third-party media player...

has any thought gone into serving up pure sounds (dog bark, duck quack,
train whistle) to defeat the voice-recognition?  this would involve a
quick lookup for the appropriate answer in lang="x" or, through
content negotiation serve up a version of the CAPTCHA that corresponds
to the requesting user agent's language preferences, which would make
the verification look-up faster...

"Half of expertise is tease."      -- Harry Shearer
Gregory J. Rosmaita: oedipus@hicom.net
     Camera Obscura: http://www.hicom.net/~oedipus/
United Blind Advocates for Talking Signs: ubats.org

Jonnie Appleseed
With his Hands-On Technolog(eye)s
reducing technology's disabilities
Received on Tuesday, 17 July 2007 17:07:48 UTC

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