[LAU] jack/oversampling

[Gene Heskett]

On Sunday 16 March 2014 14:25:14 Ralf Mardorf did opine:

> On Sun, 2014-03-16 at 08:58 -0700, Len Ovens wrote:
> > I would mix the project  at 48k or 96k
> 
> Why 96 KHz? 48 KHz doesn't cause any issues, but already provides best
> sound quality.
> 
That I think is a personal call Ralf, primarily because at 48 Khz, your 
anti-aliasing filters had better be very very good brick walls by the time 
you get above 24Khz in input content just for the aliasing control.  And 
aliasing noise, once introduced, cannot be removed by any known math 
function that does not have precise knowledge of the phasing (aka group 
delay) of the original signal.

And those very good brick wall filters _will_ have a considerable group 
delay.  IMO doing the sampling at 240K, then doing a weighted sum shift (5 
stage shift) to decimate the data down to 48K, should result in dropping 
the alias caused noise floor by several db.  Just bring lots of expensive 
hardware to do that.
 
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Cheers, Gene
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