similar to: Experimental psycho-acoustic model

> 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 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

>> 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

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 from this list, send a message to 'vorbis-dev-request@xiph.org'

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

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 word 'unsubscribe' in the

> 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 granular control over quantization

(This is almost out of topic but anyway...) It is surprising how little research effort have been put into psy-acou models for CELP. The basic problem lies in that it is not easy to alter the LP model without distroying the minimum-phase property (ie. the stability of the predictor). That leaves us with psy-acou modelling of the noise-part only. However, my own research is in constrained

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

We all know that currently Vorbis is the only codec out there that doesn't add any silence to the decoded file, so when you decode your .ogg file the resulting .wav will be exactly the same length as the original one. This is very useful when encoding gapless songs (like live concerts...). But since Vorbis is a lossy codec, even though there is no silence added, sometimes you can still hear a

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

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 Matlab licence (which I don't want to). Did anyone ever try to do

Hi. I'm an undergraduate linguistics major and computer science minor at the University of Colorado in Boulder, and am taking a couple classes this semester which give me the opportunity to do a research project - one on introductory acoustics in the physics department, and one in the linguistics department on phonetics and phonology. I've got an idea, but I'd like to hear from anyone

Here's the problem: > 2) Encoding with rate control as in single pass "Bitrate > control" will not > lead to better quality than fixed quant (with the right value > of the fixed > quant). Ratecontrol doens't know anything about "quality". It > will try to > reach more-or-less CBR. > > But somehow this is not a fair comparison, because

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

When updating the speex sources from svn tree, I found that the following revision has corrupted the deallocation (segmentation fault): ------------------------------------------------------------------------ r9320 | jm | 2005-05-27 15:05:05 -0300 (Fri, 27 May 2005) | 2 lines Proper de-allocation When compiling with the 9316, everything works fine. but when I update with later

Hi folks! In my system i have a SSD card, and i try to install extlinux in it. But, my extlinux installation not work!! I make a initrd to boot my machine on lan, and my init execute a installation of extlinux version 3.86 on my SSD card. The installation on init is similar to: http://pastebin.com/szcYCCjR The return of installation of extlinux is: /mnt is /dev/sda1 And the install not report

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

Hello there folks, i was having a look through bits of the code to see if there was anything to do with pitch control, or perhaps i should call it speed control. For instance, say you took a track off a DVD which is 48khz, forgot to run it through sox to downsample it to 44khz, yet encoded it anyway. It will sound slower (therefore, the pitch has dropped). Whilst dj-ing (though i am no