Thread Subject: Re: CombinedHardwareSubcommittee Proposal
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From: Gregg Vanderheiden
Date: Mon, Dec 18 2006 4:20 PM
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Yes. Sort of. but I don't know what you mean about general and 'for
telecom". Again the determining factor is the distance to the person, not
the type of product.
For example, the important things seems to be things like
1) things you hold up to your ear
2) things right in front of you
3) things 10 feet away
A computer used at a museum with a cup you hold up to your ear should meet
(1) "things you hold up to your ear" standards while another computer with
speakers on the table in front of you should meet (2). A computer driving
speaker across the room would meet (3).
A cellphone would meet (1) but a conference room speakerphone would meet (2)
In the "general" group we have been looking at writing guidelines by
'characteristics" of product rather than product type for just this reason.
Still in analysis stage but with products morphing as they are I think we
need to move in that direction.
Gregg C Vanderheiden Ph.D.
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Sent: Monday, December 18, 2006 4:46 PM
To: 'TEITAC General Interface Accessibility Subcommittee'; 'TEITAC self
contained/closed products subcommittee'; 'TEITAC desktop/portable (hardware)
Subject: Re: [teitac-hardware]
Yes, in the case of font size the product size is the deciding factor.
Then how about sound volume. "For voice and/or sound, products shall provide
an adjustable gain" is a common requirement. But the required minimum gain
may different; e.g. TV must be louder than headset.
It is reasonable that:
1. In the general part, we write specifications that do not include
quantitative measures; e.g. "For voice and/or sound, products shall provide
an adjustable gain."
2. In sub-category parts, we provide reasonable quantitative measures; e.g.
telecommunications product part, we write "The gain shall be adjustable up
to a minimum of 20 dB. For incremental volume control, at least one
intermediate step of 12 dB of gain shall be provided."
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