[speex-dev] Quality

Rick Kane rkane at delcomsys.com
Tue Feb 25 17:09:32 PST 2003

Think there are enough volunteers on the Web for a form of MOS?

I'm thinking of a Web Server type application where people go to the URL and
listed to just a few segments (as selected by the server) and score them.
Then they go away. The server collects the statistics as the population

You can't account for the quality of their sound cards but it you get a
large enough population maybe that averages out.

Just an idea... Don't know if it has merit.  Certainly, I'd never get time
to execute it.  I do like Mean Opinion Score (MOS) + Open Source Software
(OSS) = MOSS.  Sorry, I couldn't resist.

> -----Original Message-----
> From: owner-speex-dev at xiph.org [mailto:owner-speex-dev at xiph.org]On
> Behalf Of Jean-Marc Valin
> Sent: Tuesday, February 25, 2003 7:24 PM
> To: speex
> Subject: Re: [speex-dev] Quality
> > I was wondering if the developers were using anything to
> "objectively" test
> > the quality of the speex vocoder.  For instance PSQM or one of the many
> > derivatives.  Mean Opinion Scoring seems an expensive route.
> >
> > Is there some open source software to use for this?
> Well, I haven't found and open-source perceptual testing software, so
> I've relied so far mostly on listening and SNR/segmental SNR.
> If anyone has access to this kind of software, I'm interested to
> comparisons between different versions of Speex, mostly 0.4.0, 0.6.0,
> 0.7.0 and rc2. Even for those who only have their own ears, I'm
> interested on comments about possible regressions, mostly for the 8 kbps
> mode (--quality 4 setting or --lbr for version 0.4.0).
> 	Jean-Marc
> --
> Jean-Marc Valin, M.Sc.A.
> LABORIUS (http://www.gel.usherb.ca/laborius)
> Université de Sherbrooke, Québec, Canada

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