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Anti-Aliasing Filters and Their Usage Explained - NI
https://www.ni.com/en-us/innovations/white-papers/18/anti-aliasing-filters-and-their-usage-explained.html
This filter is an anti-alias filter because by attenuating the higher frequencies (greater than the Nyquist frequency), it prevents the aliasing components from being sampled. Because at this stage (before the sampler and the ADC) you are still in the analog world, the anti-aliasing filter is an analog filter.
Antialiasing Filter - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/antialiasing-filter
Using the same audio example, if we want to keep the sampling rate at 44.1 kHz, the anti-aliasing filter will need to have an attenuation of 40 dB at about 22 kHz. With a bandwidth of 20 kHz, the filter will need a transition from 3 dB at down to 40 dB within 2 kHz.
Digital Audio Basics 7 - Aliasing and Anti-Aliasing Filters
https://www.youtube.com/watch?v=-HTu9MYGBqo
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audio - Understanding anti aliasing filter - Signal ...
https://dsp.stackexchange.com/questions/54705/understanding-anti-aliasing-filter
So to prevent any aliasing on the downsampled sequence y [ n], you should first apply an anti-aliasing lowpass filter to the input sequence x [ n]. The cutoff frequency of the lowpass filter is given by the downsampling ratio D and is: ω c = π D. radians per sample. The gain of the lowpass filter is one. The following Matlab\Octave code ...
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