John Harrison, NI1B wrote:
Hi All,
The one REAL change in recent (PCI) sound cards seems to be that the
input low pass filter AKA anti-aliasing filter HAS BEEN ELIMINATED on
many (all?) of the cheaper PCI sound cards.
This probably was done because the cheap AC'97 compliant chipsets found on the mainboards, or in the less expensive
PCI sound cards do sample at a _fixed_ rate of 48 kHz, so the anti-aliasing filter is now fixed, no need to adjust it
when changing sampling speed. The other sampling speeds are produced by Windows itself, as said by Leif, by a software
downsampling routine, and the anti-aliasing filtering is also done in software, before the downsampling.
This under Windows. Under Linux, I don't know...
73 Alberto I2PHD
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