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Re: [codec] draft test and processing plan for the IETF Codec

Koen Vos <koen.vos@skype.net> Sat, 16 April 2011 05:04 UTC

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Date: Sat, 16 Apr 2011 07:03:55 +0200
From: Koen Vos <koen.vos@skype.net>
To: Anisse Taleb <anisse.taleb@huawei.com>
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Cc: codec@ietf.org
Subject: Re: [codec] draft test and processing plan for the IETF Codec
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Hi Anisse,

I noticed your plan tests with band-limited signals: Narrowband signals are 
filtered from 300-4000 Hz, Wideband from 50-7000 Hz, Superwideband from 
50-14000 Hz.

However, VoIP applications have no such band-pass filters (which degrade 
quality and add complexity).  So results will be more informative to the WG 
and potential adopters of the codec if the testing avoids band-pass 
filtering as well.  We want test conditions to mimic the real world as 
closely as possible. 

Instead of band-pass filtering, tests on speech could use a simple high-pass 
filter with a cutoff around 50 Hz, as many VoIP applications do indeed have 
such a filter.  

best,
koen.


----- Original Message -----
From: "Anisse Taleb" <anisse.taleb@huawei.com>
To: codec@ietf.org
Sent: Wednesday, April 13, 2011 12:32:00 AM
Subject: [codec] draft test and processing plan for the IETF Codec

Hi,
Please find attached a first draft of a test plan of the IETF codec (Opus). 
The proposal does not claim to be complete, there are still many missing things, e.g. tandeming cases, tests with delay jitter, dtx etc. Consider it as a starting point for discussion where everyone is welcome to contribute in a constructive manner. Further updates are planned, but let's see first some initial comments.

The attachment is a pdf version, please let me know if you would like to see another format and I would be glad to oblige.

Comments and additions are welcome!

Kind regards,
/Anisse
(From La Jolla - San Diego).

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