Re:There is no point to distributing music in 24-bit/192kHz ...
by Derbasti on Tuesday March 06, 2012 @01:17AM
(#3669874)
You will still need a aliasing filter that cuts off between, say, 18 and 22.5 kHz to avoid aliasing noise. That is one sharp filter no matter how you look at it. You can use a high quality, long, linear-phase FIR filter, but you can't cheat physics: sharp filters necesserily introduce distortion, and such a sharp filter so close to the hearing threshold does not go unnoticed.
Re:There is no point to distributing music in 24-bit/192kHz ...
by sjwright on Tuesday March 06, 2012 @09:12AM
(#3671030)
I don't see how a sharp filter could be needed if the DAC is oversampling.
Re:There is no point to distributing music in 24-bit/192kHz ...
by Derbasti on Tuesday March 06, 2012 @12:24PM
(#3671931)
Obviously. Analogue audio does not have a sampling rate. The ADC however can oversample all it wants, but if the output is 44.1 kHz, it needs an aliasing filter that cuts off at 22.05 kHz.
When you're talking about recording, sure, but in terms of storage and playback, we solved that problem 20 years ago with oversampling.