Re: freq response and aliasing of Edirol FA-101 (and FR-2) at 192 =

[Dan Dugan <>]

kHz

Rudy Trubitt, you wrote,

>Most A/D designs have a fixed frequency analog input filter before the
>A/D. If the A/D must operate at frequencies as high as 192, then this
>fixed filter must be set high. The consequence of this (at least
>theoretically) is that recordings made at lower sampling frequencies
>(for example 44.1 on a device capable of 192) will have more aliasing
>than would be the case if the input analog filter was set lower, to a
>value appropriate for a 44.1 recorder, rather than a 192 model.

If they do have a fixed low-pass filter, they're doing it very wrong.
A multi-rate A/D should change the filter as it changes the sample
rate.

-Dan Dugan



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