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

Dear Koen,

Let's mimic the real world as closely as possible :-).

Besides the DAC and AA filters, you cannot expect that every loudspeaker, headset, earplug, microphone out there to have a flat frequency response regardless of if it is a VoIP application or something else. Specifying a frequency mask helps in reducing some of the variability and uncertainty due to these and other external factors.

That aside, I am not against revisiting these in getting something that all agree on. 

Kind regards,
/Anisse
> -----Original Message-----
> From: Koen Vos [mailto:koen.vos@skype.net]
> Sent: Saturday, April 16, 2011 7:04 AM
> To: Anisse Taleb
> Cc: codec@ietf.org
> Subject: Re: [codec] draft test and processing plan for the IETF Codec
> 
> 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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