search for: psycho

Hi everyone, For those who like to play with experimental stuff, I've got something new to test. If you compile with --enable-vorbis-psy , Speex uses a variant of the Vorbis psycho-acoustic model to shape the coding noise. So far, I've obtained a slight increase in quality, but I'm interested in feedback from others. This still needs a lot of tuning and has received only a minimal amount of testing, so don't use it for something important. Have fun and happy new...

I wonder what psycho-acoustic model is used in ogg vorbis. Did they create their own model (this requires big listening tests) ? Or is it something that was already there, like gpsycho ? <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe...

> Hi everyone, > > For those who like to play with experimental stuff, I've got something > new to test. If you compile with --enable-vorbis-psy , Speex uses a > variant of the Vorbis psycho-acoustic model to shape the coding noise. > So far, I've obtained a slight increase in quality, but I'm interested > in feedback from others. This still needs a lot of tuning and has > received only a minimal amount of testing, so don't use it for something > important. Whe...

> Does anyone have an idea about the possibility to apply psychoacoustic > models as the ones in mp3 or AAC to a CELP coder? Thanks! > /Pontus This is (sort of) done in the decoder with the optional perceptual filtering. Speex tries to shape the noise so that it sounds more pleasant, I believe. To really use perceptual coding, one would require fine gra...

>> When enabling and compiling this with mingw on Win32, my debugger >> complains about heap overruns when calling speex_encoder_destroy(). This >> could be a mingw issue though, as I also found a stackalignment bug which >> prevents me from _USING_SSE (apparantly -mpreferred-stack-size is just >> "prefered" and therefore ignored... *Sigh*). > > Just

Happy new year all! I have had a few issues with this sort of stuff- you could adjust NB_ENC_STACK or SB_ENC_STACK (which ever you may be fiddling with) and see if the problem goes away- could be the allocation for the vorbis psy tables takes up more space than the current stack size allows (not sure how allocated? Could be your settings for supporting alloca/etc. are set different than jm,

Hi Tom, None of the new code depends on the stack allocator, but I just fixed an off-by-one overflow on the heap. Maybe that was the error and your debugger is just reporting a wrong offset. Could you try what's in the current svn (you were using svn already, right)? Jean-Marc > I have had a few issues with this sort of stuff- you could adjust NB_ENC_STACK > or SB_ENC_STACK (which

I have had in years past seen hardware (SCSI) RAID controllers lose it electronically causing the kernel to fill the logs with scary SCSI messages and ext3 to complain about "holes" in the filesystem like so: Sep 7 14:47:17 thewarehouse1 kernel: EXT3-fs error (device sd(8,81)): ext3_readdir: directory #376833 contains a hole at offset 0 I'm using drbd and heartbeat so whatever

> When enabling and compiling this with mingw on Win32, my debugger > complains about heap overruns when calling speex_encoder_destroy(). This > could be a mingw issue though, as I also found a stackalignment bug which > prevents me from _USING_SSE (apparantly -mpreferred-stack-size is just > "prefered" and therefore ignored... *Sigh*). Just so I understand, the

Hi, Does anyone have an idea about the possibility to apply psychoacoustic models as the ones in mp3 or AAC to a CELP coder? Thanks! /Pontus <p>--- >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...

Dear all! Although the Psycho-Toolbox for Matlab is free software, Matlab isn't. I'm planning to do an experiment where it's essentail to travel to the subjects, not let the subjects come to where the Matlab licences are :-( So I need to use a free software for my experiment if I don't want to by an extra Matla...

...rporating some intelligence to correlate their 'Q' values to actual perceived quality, rather than some arbitrary pixel difference value. That way, fixed-Q could actually mean something useful. I suspect that audio codecs, particularly Vorbis, do this intrinsically, because their internal psycho-accoustic models tend to be rather complex. In the video world, for reasons that elude me, this is not the case. I know of no codec that incorporates any useful psycho-visual model into its encoder (though there are encoding apps that sit on top of codecs that claim to do this). IMSHO, this shou...

...the noise-part only. However, my own research is in constrained LP-models that addresses just this problem. Unfortunately, applications are still at least a couple of years away. <p>Tom <p>Christian Buchner wrote: > > > Does anyone have an idea about the possibility to apply psychoacoustic > > models as the ones in mp3 or AAC to a CELP coder? Thanks! > > > /Pontus > > This is (sort of) done in the decoder with the optional perceptual > filtering. Speex tries to shape the noise so that it sounds more > pleasant, I believe. > > To really use...

...equired, please ask me! lsmod: http://pastebin.com/ZMv459KZ lspci -vvv: http://pastebin.com/FDjpKznC lsusb -vvv : http://pastebin.com/tVmtKLY1 ps:. Sorry if this post is duplicate, because i send this e-mail and not sure if he got the first time. -- Mi blog eres su blog: https://www.lccv.ufal.br/~psycho/ @psycho_mantys : http://twitter.com/psycho_mantys http://www.slackware.com U.L. : 450347 Fnord

Hi! Why is Ogg Vorbis better than mp3? Which basic technologies has Ogg Vorbis, that f.ex. lame doesn't have? Ogg Vorbis has a different psycho model than mp3, but what is the names of these models and what is the differences? Which advantages have Ogg Vorbis, that cant be implemented in mp3/lame due to compability reasons? <p>Thanks in advance! <p><p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg proj...

We've implemented a vorbis decoder based on Tremor and as part of the documentation we're also writing about psycho acoustic models and encoding. We're quite up to date with the decoding process and psycho acoustics in general but unfortunately not on the psycho acoustic encoding used in Vorbis. We have a few questions that would we would be very thankful to have answer to: Which tricks are used? Critica...

...to appear less frequently (as expected). One of the solution would be to "teach" the encoder that it has to pay attention that the end of one songs should match up with the beginning of another one. But I'm thinking that there might be a better solution: the encoder shouldn't use psycho-acoustic at the very begging & very end of the songs (for a few milli seconds). This will ensure that the edges will always match... Does this holds water or not? Greetings, Aleksandar --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/...

Dear R-users, In a randomized placebo-controlled within-subject design, subjects recieved a psycho-active drug and placebo. Subjects filled out a questionnaire containing 15 scales on four different time points after drug administration. In order to detect drug effects on each time point, I compared scale values between placebo and drug for all time conditions and scales, which sums up to 4*15=6...

After reading http://mp3.radified.com/mp3.htm I sent Rad an explanation of some things as I understand them. He liked it and posted it on his site (still unlinked, use the URL below). Can somebody with better understanding of psycho-acoustic terms and the vorbis model check it and comment on it? In particular I didn't know how vorbis handles quantization noise. If you reply with corrections, CC: <Rad@radified.com>. On Wed, 24 Oct 2001, Rad wrote: > Beni, > > Thanks for the note. I found it most helpful,...

Hi, I think that it would be a good thing to know more about those 2 projects (and also the future patent free format). I think that many people as me know about Lame, but not about Vorbis, and vice-versa. It would be fine that someone (perhaps the maintainer) of every project would introduce to both group of people those projects. 2 things would be interesting (to my mind): - to know about the