Thread Subject: Re: 2.2-C Audio Connection

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From: Schomburg, Paul
Date: Mon, Oct 29 2007 10:10 AM

Greg: The way you have worded this section I think it would require all
televisions used in a public area to have a 2.5 or 3.5 mm jack. I
suggest rewording (changing and to OR in (c) or, for clarity new section
(d) as follows:



When products provide auditory output beyond simple tonal feedback or
signaling, one of the following must be true:

(a) Auditory output is available via audio transducer that is designed
to be held up to the ear that meets 2.2-A (Magnetic Coupling), 2.2-B
(Interference with Hearing Device), and 2.2-E (Volume - gain) and
product does not require simultaneous use of keyboard; or

(b) A standard 2.5mm or 3.5mm audio jack at the standard signal levels
used for headphones/headsets is provided or

(c) Product is a not designed to be located in a public location; OR

(d) An adapter from the product's audio output format to a 2.5mm or
3.5mm phone jack is commonly available or available from the
manufacturer.



Rationale: A television is not intended for individual close-up
viewing. Any jack for headphones must be located a distance away from
the screen.



A general rule for the TV viewing distance is that the nearest TV
viewing distance should be limited to approximately twice the screen
width (more precise 1.87 x screen width for a subtended angle of 30
degrees), while the furthest distance being no more than five times the
width of the screen. For details see:
http://www.myhometheater.homestead.com/viewingdistancecalculator.html



Thanks, Paul

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