DACLadder
Headphoneus Supremus
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- Feb 16, 2013
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How so?
Wouldn't the interpolation filter be set at 20kHz all the same?
I would think one purpose of oversampling and correctly interpolating is to increase bandwidth of the system. This would relax requirements for the anti-aliasing filter and avoid the need for drastic brick wall filtering. So instead of steep cutoff you have a extended response above the original Nyquist frequency with a gradual filter slope depending upon amount of oversampling. I am no expert though on digital filtering.