A blog post on aliasing has been in the works for some time and is now finished. Check it out at Aliasing of Signals: Identity Theft in the Frequency Domain. The reason aliasing happens with signals is a simple consequence of discrete-time sinusoids of different frequencies not always being unique. Understanding the origin of aliasing and how to prevent it doesn't require sophisticated mathematics or even Fourier analysis. We also include two examples of aliasing with audio signals so you can both see and hear the effect of aliasing, and include plenty of pointers for studying the topic further.
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