[codec] Suggested summary...

"Christian Hoene" <hoene@uni-tuebingen.de> Fri, 02 July 2010 10:09 UTC

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From: Christian Hoene <hoene@uni-tuebingen.de>
To: 'Cullen Jennings' <fluffy@cisco.com>
References: <062.7439ee5d5fd36480e73548f37cb10207@tools.ietf.org> <3E1D8AD1-B28F-41C5-81C6-478A15432224@csperkins.org> <D6C2F445-BE4A-4571-A56D-8712C16887F1@americafree.tv> <C0347188-A2A1-4681-9F1E-0D2ECC4BDB3B@csperkins.org> <u2x6e9223711004210733g823b4777y404b02330c49dec1@mail.gmail.com> <000001cae173$dba012f0$92e038d0$@de> <r2q6e9223711004211010gfdee1a70q972e8239fef10435@mail.gmail.com> <001101cae177$e8aa6780$b9ff3680$@de> <t2t6e9223711004211119i6b107798pa01fc4b1d33debf1@mail.gmail.com> <002d01cae188$a330b2c0$e9921840$@de> <CB68DF4CFBEF4942881AD37AE1A7E8C74AB3F4A017@IRVEXCHCCR01.corp.ad.broadcom.com> <4BD11C50.2020206@usherbrooke.ca> <CB68DF4CFBEF4942881AD37AE1A7E8C74AB3F4A270@IRVEXCHCCR01.corp.ad.broadcom.com> <12151537-165D-426A-B71F-8B3D76BE4854@cisco.com> <CB68DF4CFBEF4942881AD37AE1A7E8C74B901372FE@IRVEXCHCCR01.corp.ad.broadcom.com> <20100430230756.13687lc1s5o89gsc@mail.skype.net> <CB68DF4CFBEF4942881AD37AE1A7E8C74B90345522@IRVEXCHCCR01.corp.ad.broadcom.com> <"CB68DF4! ! ! ! CFBEF49428 8C74B9 043D 30 B"@IRVEXCHCCR01.corp.ad.broadcom.com> <909E12B9-984F-4051-A93E-2291EFE0A40E@cisco.com> <CB68DF4CFBEF4942881AD37AE1A7E8C74B9BE9EDB7@IRVEXCHCCR01.corp.ad.broadcom.com> <20100526151326.2882694zuaeslk3q@mail.skype.net> <CB68DF4CFBEF4942881AD37AE1A7E8C74B9BE9F2E7@IRVEXCHCCR01.corp.ad.broadcom.com> <20100526214255.206532jzf8wjld1r@mail.skype.net> <002901cafd89$acf402e0$06dc08a0$@de> <19367DD02EBD40829869907AEA0CE128@china.huawei.com> <000601cafd9b$148fd850$3daf88f0$@de> <568A92CB079CCF43BA5C8D7B08BCB4AE817DCBA900@SJEXCHCCR02.corp.ad.broadcom.com> <002501cafdb4$09394810$1babd830$@de> <56E363F9-AB88-43A3-8ECC-99A7E9796330@cisco.com>
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Date: Fri, 02 Jul 2010 12:09:13 +0200
Organization: Universität Tübingen
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Cc: codec@ietf.org
Subject: [codec] Suggested summary...
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taking Cullen advise, I would like to suggest the following summary.

> 1) low delay mode

The codec shall be able to operated at a mode having an algorithmic delay of 8ms or less while having a frame duration of 5 1/3 ms or less. This is require to support ensemble performances over the Internet and other highly interactive conversational tasks.

> 2) low complexity mode (whatever this means)

The codec shall be able to operate at a low complexity mode while requiring less computational resources than a AMR-WB codec 
(< 38 WMOPS if measured with ITU-T STL2005 BaseOP (ITU-T G.192)).

> 3) technical understanding on how latency sums up on different platforms

Standard ITU-T G.114 (05/00 and 05/03) describes how different system components contribute to the one-way transmission delay. It states that the processing time of the codec contributes with an additional delay as large as the frame duration.

However, it is common consensus that plenty computational resources will be available most of the time. Then, the codec processing will be much faster than one frame duration. Typical values are range from a factor faster of 100 (smart phones) to 1000 (PCs). A device working at full load is a rare case.

Any suggestion to improve it?

With best regards,


Dr.-Ing. Christian Hoene
Interactive Communication Systems (ICS), University of Tübingen 
Sand 13, 72076 Tübingen, Germany, Phone +49 7071 2970532 

-----Original Message-----
From: Cullen Jennings [mailto:fluffy@cisco.com] 
Sent: Monday, June 21, 2010 7:21 PM
To: Christian Hoene
Cc: codec@ietf.org
Subject: Re: [codec] #16: Multicast?

On May 27, 2010, at 9:48 AM, Christian Hoene wrote:

> So, we have consensus on 
> 1) low delay mode
> 2) low complexity mode (whatever this means)
> 3) technical understanding on how latency sums up on different platforms

>From a Chair point of view, I don't think the Chairs could summarize or call consensus on these three - however, I'm not sure that matters. If you think a key piece of consensus has come out of this conversation and that it needs to captured in the archive, can you summarize what you think it is folks agree with and then the chairs can make some sort of consensus call.

Thanks, Cullen <with my chair hat on>