prevent aliasing

[Bingbing Z]

From my understanding, we need a lowpass filter to remove the high frequency harmonics which cause aliasing. How do we define the frequency range of this filter slope? Is there any other way to antialiasing ?

[Simon]

The low-ass filter removes all energy above the cut-off frequency – not just harmonics, but frication and any other sounds.

The cut-off frequency of the low-pass filter needs to be no higher than the Nyquist frequency. Real filters have (as you point out) a slope between the pass-band and the stop-band, not a perfect cut-off, and so we will have to filter out some energy just below the Nyquist frequency as well.

[Author]

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