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oversampling

146.103.254.13

the ONLY reason for oversampling is that it allows part of
the reconstruction filter to be executed in the digital
domain, where it is
1) cheaper
2) "much more possible" to attain very high orders, and
if you want with in-built phase linearity over the
audible band

Digitally you can make 20-40th order linear phase low-pass
filters. If you do that in the analogue domain, you'll
end up with a truck load of (sensitive) components that
will trash the signal you're trying to push through it.


Of course the new fashion is back to basics: R2R-DAC, no oversampling,
low-order analogue filtering, and hoping that the amp
and speakers downstream won't choke on the HF garbage
(Audio Note, 47Labs).
(Note: you can't do this with one-bit DACs, as these require
massive oversampling to obtain their resolution in the
audible band).


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