Thread Subject: Re: 2.2-C Audio Connection

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From: Gregg Vanderheiden
Date: Mon, Oct 29 2007 10:40 AM

Paul



You are correct. That is a problem with what I posted. The problem is I
posted the wrong version. It was not the latest proposal.



The one Rob posted was the latest.

And it addresses the public display problem. I will repost the proper
thing with rationale.



Apologies.




Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.






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From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Schomburg,
Paul
Sent: Monday, October 29, 2007 11:08 AM
To: TEITAC desktop/portable (hardware) subcommittee; TEITAC
Telecommunications Subcommittee; = EMAIL ADDRESS REMOVED =
Cc: = EMAIL ADDRESS REMOVED = ; Schomburg, Paul
Subject: Re: [teitac-hardware] [teitac-telecom] 2.2-C Audio Connection

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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From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Gregg
Vanderheiden
Sent: Monday, October 29, 2007 11:38 AM
To: 'TEITAC Telecommunications Subcommittee';
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Cc: = EMAIL ADDRESS REMOVED = ; = EMAIL ADDRESS REMOVED =
Subject: Re: [teitac-hardware] [teitac-telecom] 2.2-C Audio Connection



FYI



Here is version 3 with the notes attached for those sorting this out from
different product lines.






VERSION 3


2.2-C - Audio Connection

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 and 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.

Note: RJ-9, USB, and Bluetooth connections all have commonly available
adapters. Products (not designed for public locations) with these or other
forms of audio connection that have adapters would meet 2.2-C-(c)



Rationale

* public phones have amplification and coupling and that meets needs
of almost all users so shouldn't need a jack
* users should not be required to carry 'all' adapters with them so
public systems should not require them to have an adapter to use the product
(other than a simple 2.5 to 3.5 or 3.5 to 2.5 adapter)
* RJ-9, USB, RCA, and Bluetooth connections all have commonly
available adapters. Note was added since there was concern that unless in a
note, purchasing agents may not recognize it as allowable.
* Addresses the issue of "private listening' which is provided via the
standard handset.
* Kiosks with keyboards usually require blind people to have both
hands free.



How it would apply

* public phones would use (a)
* office phones could use (b) but would likely use (c)
* computers with build in speech conversation could use (b) or (c)
* televisions could use (b) or (c)
* Kiosks without keyboards could use (a) or (b)
* Kiosks WITH keyboards would have to use (b) (or, of course, both a
and b)








Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.






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Sent: Monday, October 29, 2007 9:13 AM
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Subject: [teitac-telecom] 2.2-C Audio Connection
Importance: High

All,

Per the last TEITAC con-call, the three proposals for the Audio Connection
language are presented below. Some of the concerns voiced include the
complexity and specificity in the language as it has evolved. The telecom,
hardware, and closed subcommittee's have been cc'd for technical comment.
The TEITAC committee needs to determine the next step relative to which
version or versions to propose for the draft.

Version 3 is the most recent proposal that should be reviewed. Due to the
complexity that has arisen around this requirement due to it's impact on
multiple products and conditions (public and private) please review and
provide comment including a vote "for" or "against" version 3.

Many thanks,

Rob

2.2-C - Audio Connection

Version 1:

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.

* If the product is a public-shared product then the connection must
be via a standard 2.5mm or 3.5mm audio jack.

* If the product is personal-private product then the connection can
be wired or wireless as long as a 2.5mm or 3.5mm phone jack adapter is
available from the manufacturer.

Alternate wording for clarity

* Public-shared products must provide the connection via a standard
2.5mm or 3.5mm audio jack.

* Personal-private products may provide either a wired or wireless
connection. A wired connection must be via a standard 2.5mm or 3.5mm audio
jack. A wireless connection may be used as long as a 2.5mm or 3.5mm phone
jack adapter is available from the manufacturer.

Version 2, posted to plenary email Oct 19, 2007:

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

* Public-shared products must provide the connection via a standard
2.5mm or 3.5mm phone jack or RCA audio jack.

* Personal-private products must provide either a 2.5mm or 3.5mm phone
jack or a wired or wireless connection that has a 2.5mm or 3.5mm phone jack
adapter that is commonly available.

Version 3, posted to plenary email Oct 20, 2007:

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

1. Conforming Handset: 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

2. Phone Jack: A standard 2.5mm or 3.5mm audio jack for
headphones/headsets is provided or

3. Any Connection with Adapter avail: Product is a not designed to be
located in a public location and 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.

4. Public Display only: Product is designed for public audio or
audio-video display only and there is a standard audio output on the
product-system (which can be but does not need to be accessible to the
public).

* Note: RJ-9, RCA, USB, and Bluetooth connections all have commonly
available adapters. Products (not designed for public locations) with these
or other forms of audio connection that have adapters would meet 2.2-C-(c)

* Note: Public Display systems need to meet other provisions in the
guidelines including the ability to display captions and supplemental audio.

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