Re: [AVT] RE: <draft-ietf-avt-rtp-vmr-wb-03.txt>: sampling rate

Qiaobing Xie <Qiaobing.Xie@motorola.com> Fri, 10 September 2004 07:37 UTC

Received: from ietf-mx.ietf.org (ietf-mx.ietf.org [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id DAA00353 for <avt-archive@ietf.org>; Fri, 10 Sep 2004 03:37:11 -0400 (EDT)
Received: from megatron.ietf.org ([132.151.6.71]) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1C5g1x-0008Dt-3A for avt-archive@ietf.org; Fri, 10 Sep 2004 03:41:23 -0400
Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1C5fsX-0005KA-L5; Fri, 10 Sep 2004 03:31:29 -0400
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1C5foC-0004Qy-7e for avt@megatron.ietf.org; Fri, 10 Sep 2004 03:27:00 -0400
Received: from ietf-mx.ietf.org (ietf-mx.ietf.org [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id DAA29829 for <avt@ietf.org>; Fri, 10 Sep 2004 03:26:58 -0400 (EDT)
Received: from motgate8.mot.com ([129.188.136.8]) by ietf-mx.ietf.org with esmtp (Exim 4.33) id 1C5frx-00083l-L3 for avt@ietf.org; Fri, 10 Sep 2004 03:31:09 -0400
Received: from az33exr01.mot.com (az33exr01.mot.com [10.64.251.231]) by motgate8.mot.com (Motorola/Motgate8) with ESMTP id i8A7RlF7025931; Fri, 10 Sep 2004 00:27:47 -0700 (MST)
Received: from motorola.com ([163.14.20.99]) by az33exr01.mot.com (Motorola/az33exr01) with ESMTP id i8A7IcRv006043; Fri, 10 Sep 2004 02:18:41 -0500
Message-ID: <4141578F.7040603@motorola.com>
Date: Fri, 10 Sep 2004 15:28:15 +0800
From: Qiaobing Xie <Qiaobing.Xie@motorola.com>
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.4) Gecko/20030624 Netscape/7.1
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Magnus Westerlund <magnus.westerlund@ericsson.com>
Subject: Re: [AVT] RE: <draft-ietf-avt-rtp-vmr-wb-03.txt>: sampling rate
References: <0B08EA1BF5F6304992CDC985EE02209E02A74362@sdebe002.americas.nokia.com> <41414F49.2070306@ericsson.com>
In-Reply-To: <41414F49.2070306@ericsson.com>
Content-Type: text/plain; charset="us-ascii"; format="flowed"
Content-Transfer-Encoding: 7bit
X-Spam-Score: 0.0 (/)
X-Scan-Signature: d6b246023072368de71562c0ab503126
Content-Transfer-Encoding: 7bit
Cc: avt@ietf.org, sassan.ahmadi@nokia.com
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Audio/Video Transport Working Group <avt.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=unsubscribe>
List-Post: <mailto:avt@ietf.org>
List-Help: <mailto:avt-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=subscribe>
Sender: avt-bounces@ietf.org
Errors-To: avt-bounces@ietf.org
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 93238566e09e6e262849b4f805833007
Content-Transfer-Encoding: 7bit

Hi, Magnus/Sassan,

<snip>

>> 1- Only one RTP timestamp clock rate of 16000 Hz is used throughout 
>> the I-D.
> 
> I think this is a good change that simplify things.

Agreed. I'd also like to suggest that some new text be added to capture the essence of this 
sampling rate discussion... we don't want further readers of the RFC to get the wrong 
impression that only 16k speech/music can be passed through vmr-wb codec. Some explanation 
over why only 16k timestamp rate is defined for the payload and how one can still work with 
8k media would definitely help, especially to those who are unfamiliar with the codec 
internal operation.

regards,
-Qiaobing


_______________________________________________
Audio/Video Transport Working Group
avt@ietf.org
https://www1.ietf.org/mailman/listinfo/avt