Re: [LAU] jack/oversampling

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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