Thread Subject: 2.2-C - Audio Connection

From: Gregg Vanderheiden
Date: Fri, Sep 21 2007 12:40 PM

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Given that the closed function group has suggested that "Public-shared"
and "personal-private" definitions be deleted (and that the specific
aspects be included in the provisions) how about we change the 2.2-C -
Audio Connection as follows.

2.2-C - Audio Connection

When products provide auditory output beyond simple tonal feedback or
signaling, the audio signal must be provided at a standard signal level
through an industry standard connection that will allow for private
listening.

* Products designed to be used in public places must provide the
connection via a standard 2.5mm or 3.5mm audio jack at the standard signal
levels used for headphones/headsets.

* All other products can use any connection method as long as long as
a 2.5mm or 3.5mm phone jack adapter is available from the manufacturer or
commonly available.




Rationale

1) this is looser than current TEITAC in that all connections are
possible rather than just 'connetors'.

2) It makes the connection for public systems clearer. Also ensures
users can predict what they would need to have with them when they encounter
public devices.

3) The jacks allow low cost connection and do not require battery
operated electronic receivers etc.

4) Wireless methods can also be used (in addition to jack) on public
systems - to provide more options and test these ideas for the future.

5) It allows other methods to be pioneered as sole method on all but
public devices. If these become ubiquitous and cheap and common enough
they may be sufficient for public devices in the future.

6) The jacks (on public devices and via adapter for other devices)
allows compatibility with a wide variety of assistive listening devices from
special headphones to amplifiers, cochlear implant amplifiers, hearing aids
etc.

7) Adapters can be from manufacturer (to allow proprietary adapters to
be used) or, if they are commonly available otherwise, it allows them to
come from other sources so that it does not require the manufacturer to
stock them (with all the extra costs that that entails).





(suggest we capture our rationale as well as our resolution in the end. )








Gregg

------------------------

Gregg C Vanderheiden Ph.D.
Professor - Depts of Ind. Engr. & BioMed Engr.
Director - Trace R & D Center
University of Wisconsin-Madison
< <http://trace.wisc.edu/> http://trace.wisc.edu/> FAX 608/262-8848

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