search for: subband

Hello, I have improved quality for -l1->-l4 settings.I have properly set up the wavelet coeff threshold of the dead-zone according to the different wavelet subbands, I have then saved another 1Ko per .nhw files without noticeable difference and so I have raised again the quantization.The reconstructed images have now a better precision and still a good neatness. Update at: http://nhwcodec.blogspot.com/ Else I realize that JPEG XR (2009) and WebP (2011) are...

http://www.subband.com server down? I want to regist MacAmp... and now, Does anybody know, free-vorbis decoder for macintosh. Kaz Shioda shioda@bgm.ne.jp --- >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 ...

...uch a page here: > >http://thebasement.org/sound/vorbis_info > >It's probably woefully incomplete. Well, there are only a few more, AFAIK: - The Quinntissential Player [Windows] http://www.quinnware.com/ - Zinf [Windows & Linux] http://www.zinf.org/ - MacAmp [Mac] http://www.subband.com/macamp/ - Audion 3 [Mac] http://www.panic.com/audion/ --- >8 ---- List archives: http://www.xiph.org/archives/ icecast project homepage: http://www.icecast.org/ To unsubscribe from this list, send a message to 'icecast-request@xiph.org' containing only the word 'unsubscribe...

I write a work over Vorbis. ? ?Now I have a few questions to the function. ? ?For what is the MDCT used? ? ?For what is the FFT used? ? ?How is the expiration with the encodieren? ?In the reference to the MDCT,FFT and the hearing model . ? ?Is there a volume fragmentation in Subband as MP3? ? ?If it is possible, the answers in the detail ?Thanks ? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/vorbis/attachments/20050610/483e1f7e/attachment.html

CELP based coders perform poorly when you mix streams. Perhaps, we need a transform code or a subband code at somewhat higher rate 12-16 kbps that will retain the quality after transcoding and mixing. Is the speex ultra-wideband based on subband coding? -Devendra Jalihal <p>On Fri, 21 Nov 2003, Ulrich B. Staudinger wrote: > Hi, > been silent in this discussion for quite long ... &gt...

Hi again. Since mostly stupid people gave me stupid answers last time, I will try again. MP3 and Ogg Vorbis use different models in order to remove most of the bits. What is the names of these models and how do they differ? <p><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

...achine took 2ms, which (if the PCM frame is 7ms in length) means the machine can only encode three streams in realtime ... <p><p>Am Sa, 2003-11-22 um 03.30 schrieb Devendra Jalihal: > CELP based coders perform poorly when you mix streams. Perhaps, we need > a transform code or a subband code at somewhat higher rate 12-16 kbps > that will retain the quality after transcoding and mixing. Is the speex > ultra-wideband based on subband coding? > -Devendra Jalihal > > > On Fri, 21 Nov 2003, Ulrich B. Staudinger wrote: > > > Hi, > > been silent in t...

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

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

...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 noise in various spectral bands. Speex > is not a subband coder and has no such control. But it already does > a better job than MP3 and other codecs at these bitrates without > using a PSY model. > > Besides those PSY models are mostly FFT based which would greatly > increase the encoder complity. We don't really want that. Do we ;) &...

Hi I have gone through the document available in the net regarding the Vorbis encoder /Decoder. Based on that i have prepared a understanding document on the encoder/decoder block. I would like to know whether my understanding of the coder is OK. If there are any other additional block /information pl. provide me with the same. Thanks and regards S.Padmashri <HR NOSHADE> <UL>

There's no perfect solution to the multiple client problem. Each approach has advantages and drawbacks: 1) Mixing at the server - Allows a constant bandwidth for every client - Allows compatibility with regular VoIP prones - Requires transcoding, even when only on person is talking - Higher bit-rate required for the general case (one speaker is talking) 2) Sending multiple streams - Possible

...though I thought of this a while ago, I only got to try it recently because it seemed like a wild shot in the dark. Unexpectedly, the results were very good. It's possible we will be able to get away with a fixed block-size encoder with no quality penalty! Unlike MPEG/AAC, there is no subbanding of the time domain data before MDCT; my own experiments last year indicated that a good window function and a 'monolithic' MDCT produces transform domain data just as good as subbanding with much less complexity. Of course, the price is that you need to make sure to have a *damned* fast...

...m by 1) LPC-Filter + quantized LPC residual OR 2) using an NSQ (noise shaping quantizer) The AAC format allows method 1. But Method 2 could be done for both (Vorbis and AAC) without breaking compatibility. In fact, method 2 is used by MPC in the time domain to shape the quantization noise within a subband to better match the masking threshold. An NSQ applied in time domain can spectral shape the q-noise. What about an NSQ applied in the frequency domain ? What does it do ? Well, because of the time/frequency duality it will TEMPORAL-SHAPE the q-noise. Et voilà ! That's the theory. Don't kn...

...ontus 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 noise in various spectral bands. Speex is not a subband coder and has no such control. But it already does a better job than MP3 and other codecs at these bitrates without using a PSY model. Besides those PSY models are mostly FFT based which would greatly increase the encoder complity. We don't really want that. Do we ;) Christian --- >8 ----...

...ug 08, 2003 at 09:20:09PM -0400, Chris G (Moguta) wrote: > >I maintain such a page here: > > > >http://thebasement.org/sound/vorbis_info > > > >It's probably woefully incomplete. > > Well, there are only a few more, AFAIK: > - MacAmp [Mac] > http://www.subband.com/macamp/ > > - Audion 3 [Mac] > http://www.panic.com/audion/ doesn't mint audio play ogg streams too? http://mint.unsanity.com/ it's not free, but neither is much of anything else for the mac. :P -- 01CB B175 70D8 2E39 CA13 AEA6 3A2B 2219 31CD 5381 "The irony is that...

...uta) wrote: > > >I maintain such a page here: > > > > > >http://thebasement.org/sound/vorbis_info > > > > > >It's probably woefully incomplete. > > > > Well, there are only a few more, AFAIK: > > - MacAmp [Mac] > > http://www.subband.com/macamp/ > > > > - Audion 3 [Mac] > > http://www.panic.com/audion/ > > doesn't mint audio play ogg streams too? http://mint.unsanity.com/ > it's not free, but neither is much of anything else for the mac. :P Mint audio plays static ogg, not streamed, last ti...

Hello vorbis developer! I'm not very experienced in informatics, cause i'm only an audio engineer and sorry for my broken english but i have an idea... After the filterbank the maximum aplitude in each band decides about the nessesary bits, then the psychoacoustic model decides how much of the signal can be truncated without hearable noise. What do you think about quantising the

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'

Some thoughts for the new year: 1) MDCT is good for image coding 2) image coding and audio coding are two very different things 3) combine 1 and 2 4) if a psycho model is good, after leaving out what it tells you you can without hurting quality, applying the same model should yield the same results as you got before 5) from 4: decode -> encode -> decode should result in (almost) the