3 ms·

This is the most lucid explanation of aliasing I think I've ever read. I mostly deal with this stuff in the realm of audio where the matter of analog vs digita

This is the most lucid explanation of aliasing I think I've ever read. I mostly deal with this stuff in the realm of audio where the matter of analog vs digital rages regularly. The reason one hears "Nyquist says" so often from people defending digital audio is that the pro-analog people are imagining stair-stepped signals in which the information that is "lost" results in a noticeable degradation in sound quality. This (11-year-old) video is the gold standard for addressing this concern: https://www.youtube.com/watch?v=cIQ9IXSUzuM https://www.youtube.com/watch?v=cIQ9IXSUzuM Curiously, no one ever seems to mention the actual problems (like aliasing).

bgnn 3y ago
That depends on the profession I think. If you are designing A/D or D/A converters, you know sampling and all the artefacts by heart. Nyquist criterion is extremely important, but it is simplistic. You need to consider a lot of other stuff like out-of-band noise and harmonics, reconstruction filters etc etc. We have periodic steady state analysis to simulate sampled systems and harmonic transfer functions by the way. It is extremely useful especially to stimulate noise aliasing.