Thread Subject: Re: teitac-telecom Digest, Vol 10, Issue 21

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From: Gunnar Hellström
Date: Tue, Jul 10 2007 4:55 PM

Mary and all,

I saw a statement in EWG 5E that may cause a risk for misinterpretations.

It is:



3. Such real time text send and receive capabilities must be synchronized
with voice as part of the same communication session.

We may need to state the synchronism requirement explicitly in order for the
fulfillment of the requirement to be measurable.

I suggest to add wording about what synchronism means:

3. Such real time text send and receive capabilities must be synchronized
with voice as part of the same communication session so that remaining
synchronism deviations are kept below 2 seconds during the session.

Motivation:
The real requirement is a maximum of 2 seconds. The most critical
application is probably the captioned audio conference, where the hearing
impaired person taking part through live captioning. The opportunity to get
the floor and comment a speaker is reduced drastically if the text is more
than two seconds later than audio. Audio should not be delayed more than 400
ms from source to destination according to commonly applied human factor
requirements.
For real-time text we allow one second delay from source to transmission.
Then there is some delay in the network as well. Let us assume 400 ms.

This leads us to accept that the text may arrive up to 1000 ms after the
corresponding audio. It is still within the human factors goals.
We have also technical reasons to accept this delay. One is that it is
preferrable to collect characters for transmission in short intervals. The
normal interval is 300 ms. That limits the bandwidth needed for real-time
text.
The other reason is that occasionally the characters need to be taken from
retransmissions in order to keep reliability high.


Gunnar













-------------------------------------------------------------------
Gunnar Hellström
Omnitor
= EMAIL ADDRESS REMOVED =
Tel: +46708204288
www.omnitor.se

-----Original Message-----
From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Brooner
Mary-AMB004
Sent: Monday, July 09, 2007 8:42 PM
To: = EMAIL ADDRESS REMOVED =
Subject: Re: [teitac-telecom] teitac-telecom Digest, Vol 10, Issue 21

Telecom WG -

Please accept my apologies. I had a call scheduled today and I got
pulled into a meeting that went longer than I had expected. My secretary is
on vacation so I couldn't have her open the line for me.

What I had hoped we could do today is talk about any "corrections"
to the July 6 EWG draft. If you have any, please put them on this listserv
and I will try to note them on our document to make a comprehensive
suggested edit to the EWG.

Mary Brooner
Co-chair T/c wg

-----Original Message-----
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Sent: Monday, July 09, 2007 2:16 PM
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Subject: teitac-telecom Digest, Vol 10, Issue 21

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Today's Topics:

1. Re: Subcommittee meeting? (Tom Brett)
2. Re: Subcommittee meeting? (James Elekes)
3. Re: Subcommittee meeting? (Tom Brett)
4. Re: Subcommittee meeting? (James Elekes)


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Message: 1
Date: Mon, 9 Jul 2007 14:26:00 -0400
From: "Tom Brett" < = EMAIL ADDRESS REMOVED = >
Subject: Re: [teitac-telecom] Subcommittee meeting?
To: "'TEITAC Telecommunications Subcommittee'"
< = EMAIL ADDRESS REMOVED = >
Message-ID:

<!&!AAAAAAAAAAAYAAAAAAAAAPu4vK2NeatItIaNZjith8jCgAAAEAAAAB4uccojMLpDpHHT
t1I67JEBAAAAAA==@comcast.net>

Content-Type: text/plain; charset="iso-8859-1"

Well it is almost ? hr after the meeting was scheduled to start? I am going
to tell the captioner that there?s not going to be a meeting?



I am pretty disappointed.



Tom Brett



_____

From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Rebecca
Schwartz
Sent: Monday, July 09, 2007 2:19 PM
To: TEITAC Telecommunications Subcommittee
Subject: Re: [teitac-telecom] Subcommittee meeting?



Yes, I believe so.



Rebecca Schwartz, Esq.

Manager, Regulatory and Government Affairs

TIA

2500 Wilson Blvd. Ste. 300

Arlington, VA 22201

703.907.7477 (OFFICE)

703.395.7511 (CELL)

703.907.7727 (FAX)

_____

From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Tom Brett
Sent: Monday, July 09, 2007 2:21 PM
To: 'TEITAC Telecommunications Subcommittee'
Subject: Re: [teitac-telecom] Subcommittee meeting?



Do we need a moderator ?Mary or Brenda to start the meeting?



Tom Brett



_____

From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Rebecca
Schwartz
Sent: Monday, July 09, 2007 2:16 PM
To: TEITAC Telecommunications Subcommittee
Subject: Re: [teitac-telecom] Subcommittee meeting?



I am on the line on hold.



Rebecca Schwartz, Esq.

Manager, Regulatory and Government Affairs

TIA

2500 Wilson Blvd. Ste. 300

Arlington, VA 22201

703.907.7477 (OFFICE)

703.395.7511 (CELL)

703.907.7727 (FAX)

_____

From: = EMAIL ADDRESS REMOVED =
[mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of Tom Brett
Sent: Monday, July 09, 2007 2:18 PM
To: 'TEITAC Telecommunications Subcommittee'
Subject: [teitac-telecom] Subcommittee meeting?



The captioner has dialed into 877-825-8522 Access Code: 0835477# and is
waiting. No one else is on the line.



Tom Brett





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Message: 2
Date: Mon, 09 Jul 2007 15:27:27 -0400
From: James Elekes < = EMAIL ADDRESS REMOVED = >
Subject: Re: [teitac-telecom] Subcommittee meeting?
To: TEITAC Telecommunications Subcommittee
< = EMAIL ADDRESS REMOVED = >
Message-ID:

< = EMAIL ADDRESS REMOVED = >
Content-Type: text/plain; charset="us-ascii"; format=flowed

Tom, I was just disconnected from the Conference. I am having no luck with
re-connect.

Jim

At 02:18 PM 7/9/2007, you wrote:
>The captioner has dialed into 877-825-8522 Access Code: 0835477# and is

>waiting. No one else is on the line.
>
>Tom Brett
>
>
>

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