[vorbis] 48000 Hz in vorbis rc3?

[fungus]

Ben Pearre wrote:
> 
> Not entirely true.  It's well-known that we can't consciously hear
> sustained sine waves above 18KHz or so, but it's now thought that
> there are other situations in which much higher frequencies make a big
> difference. 
> 

The higher sampling rate isn't there to reproduce
high frequency signals (which are inaudible), it's
there to reduce aliasing.

http://www.earlevel.com/Digital%20Audio/Aliasing.html

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