Thanks Of course, I have a billion vectors from G.72x, GSM, QCELP, EVRC,... I wonder what the copyrights and licenses say about using them for a different vocoder... Hmmmmm...> -----Original Message----- > From: owner-speex-dev@xiph.org [mailto:owner-speex-dev@xiph.org]On > Behalf Of Jean-Marc Valin > Sent: Wednesday, February 26, 2003 3:45 PM > To: speex > Subject: RE: [speex-dev] Quality > > > Le mer 26/02/2003 à 15:43, Rick Kane a écrit : > > I was also wondering if there is a standard set of input > sequences people > > are using to test Speex. I haven't stumbled upon it/them yet. > > I've got a few samples at: http://www.speex.org/audio/samples/ > > Jean-Marc > > > > -----Original Message----- > > > From: owner-speex-dev@xiph.org [mailto:owner-speex-dev@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 > > > > > > > > > > --- >8 ---- > > List archives: http://www.xiph.org/archives/ > > Ogg project homepage: http://www.xiph.org/ogg/ > > To unsubscribe from this list, send a message to > 'speex-dev-request@xiph.org' > > containing only the word 'unsubscribe' in the body. No subject > is needed. > > Unsubscribe messages sent to the list will be ignored/filtered. > -- > Jean-Marc Valin, M.Sc.A. > LABORIUS (http://www.gel.usherb.ca/laborius) > Université de Sherbrooke, Québec, Canada > >--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
I was also wondering if there is a standard set of input sequences people are using to test Speex. I haven't stumbled upon it/them yet.> -----Original Message----- > From: owner-speex-dev@xiph.org [mailto:owner-speex-dev@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 > >--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
Le mer 26/02/2003 à 15:43, Rick Kane a écrit :> I was also wondering if there is a standard set of input sequences people > are using to test Speex. I haven't stumbled upon it/them yet.I've got a few samples at: http://www.speex.org/audio/samples/ Jean-Marc> > -----Original Message----- > > From: owner-speex-dev@xiph.org [mailto:owner-speex-dev@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 > > > > > > --- >8 ---- > List archives: http://www.xiph.org/archives/ > Ogg project homepage: http://www.xiph.org/ogg/ > To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' > containing only the word 'unsubscribe' in the body. No subject is needed. > Unsubscribe messages sent to the list will be ignored/filtered.-- Jean-Marc Valin, M.Sc.A. LABORIUS (http://www.gel.usherb.ca/laborius) Université de Sherbrooke, Québec, Canada <p> -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 242 bytes Desc: signature.asc Url : http://lists.xiph.org/pipermail/speex-dev/attachments/20030226/9569cc02/signature-0001.pgp
Trevor Yensen
2004-Aug-06 15:01 UTC
[speex-dev] Higher Bandwidth at lower quality settings
Hi,
I was wondering if anyone has experimented with Speex's wideband
(16kHz)
mode at lower quality settings. In particular I have been using quality 3,
and with wideband input files the resultant frequency spectrum is limited to
about an upper end around 3.5kHz (almost telephony quality bandwidth). Has
anyone tried increasing the spectral bandwidth at the expense of lowering
the narrowband quality (ie using two very low bitrate codebooks, one for
narrowband and one for the 4-8kHz band - to match the same bitrate at
quality 3)? If you have can you comment on the quality? (Looking through
the Speex code, I noticed that at lower quality settings wideband mode
basically reverts to narrowband.)
Anyway, this is an experiment I plan on trying, but I was wondering if
anyone had any tips.
Cheers,
Trevor
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