Hi people, looking around for a new audiocard, my eye fell on the M-audio audiophile 2496. It has 4 digital in/out and is 24bit, 96kHz. The sound quality is very good, if I can believe the reviews. <p>My question is: can vorbis do 24bit, 96kHz ? -- --- >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-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.
> Hi people, > > looking around for a new audiocard, my eye fell on the > M-audio audiophile 2496. It has 4 digital in/out and > is 24bit, 96kHz. The sound quality is very good, > if I can believe the reviews. > > > My question is: can vorbis do 24bit, 96kHz ?Vorbis does 24 (and 32) bit today. As far as I can guess, there is no reason it couldn't do 96kHz. It's just that nobody has had time to tune the encoder for 96kHz sources. The fact that most people don't have 96kHz sources and sound cards might have something to do with that... Peter Harris <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-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.
Roland Nagtegaal wrote:> My question is: can vorbis do 24bit, 96kHz ?The 24bit are not a problem as there is no such thing as "16bit" in an encoded file. Internally, it's all floats (afaik) and it depends on the decoder how much bits per sample there will be in the end. Peter's Winamp plugin supports 16, 24 and 32bit output, for example. The problem might be the 96kHz. None of the modes I know of are tuned for that sample rate. On the other hand, you really don't need it. 96kHz is designed for mixing and destructive editing of samples - it's needed to keep a low signal to noise ratio when doing lots of alterations to some sound. Since the average human can't percieve tones higher than ~20kHz, 44.1kHz are all you need. The 96kHz are useful if you mix and master music - and that's not where Ogg is useful. Besides, 96kHz encoded files would still be huge. If low-end soundcards support that, it's more about baiting customers with buzzy features they'll never need. <p>Moritz -- _______________________________________________________________________ "They who would give up an essential liberty for temporary security, deserve neither liberty or security" - Benjamin Franklin --- >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-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.
This sampling issue mentioned below is the only reason I can see 96Khz sampling being useful. But keep in mind that this only occurs when the waveform is very close to a multiple of 44.1Khz, so really only above 20Khz are affected greatly. Most people can't hear above 16Khz anyway, and I think you only really need to allow up to 20Khz. 22Khz is a stretch for most peoples ears. 96Khz takes us into the realm of overkill, but it would garauntee you can't hear "better than" the recording. Does vorbis do 96Khz?> > Even with 44.1kHz you can still get aliasing in the sampling and > lose/create signals. > > > Imagine I have a 22.5kHz sine wave and I sample it at 44.1kHz. > > Depending on the pahse of the moon, I could sample it either > at the peaks or at the zero-crossing points. One would produce > a signal at the end of the day, the other would produce silence.<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 'vorbis-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 should have noted "I am not a signal aliasing expert!" Sorry. <p>----- Original Message ----- From: medit <meditvr@teleline.es> Date: Thursday, December 20, 2001 9:13 am Subject: Re: [vorbis] 24/96 ?> MARK JAMES HETHERINGTON wrote: > > > This sampling issue mentioned below is the only reason I can > see 96Khz > > sampling being useful. But keep in mind that this only occurs > when the > > waveform is very close to a multiple of 44.1Khz, so really only > above > 20Khz are affected greatly. > > > Not exactly true. If you've got a signal that's slightly > out of phase with a multiple of the sampling rate then > what you sample will be a sine wave at a much lower > frequency than the actual signal. This is the definition > of "aliasing" - one frequency pretending to be another. > This is shown (let's see, google, google, google) here: > > http://www.medicine.mcgill.ca/physio/vlabonline/biosiglab/aliasing.htm > > > > ... Most people can't hear above 16Khz anyway, > > > and I think you only really need to allow up to 20Khz. 22Khz is a > > stretch for most peoples ears. 96Khz takes us into the realm of > > overkill, > > > High sample rates are mainly needed to avoid aliasing, > not to reproduce the signal any better (though they can > do that as well!) > > > > > > -- > <\___/> > / O O \ > \_____/ FTB. > > > > > > --- >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- > 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. ><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-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.