Produit de convolution. Nyquist-Shannon Sampling Theorem - AfterDawn: Glossary of technology terms & acronyms. Signal Processing Tutorial Discrete-time Convolution Examples Inverse Z-transform. What is it aliasing? When it occurs? What is it aliasing? When it occurs? Asked by: Maria Octavia Answer Aliasing is a signal processing term. Imagine a disk (or paper plate) with a dot near the edge. The most common example comes from old westerns. Answered by: Kevin Frye, M.S., Geophysics grad student, MIT, Cambridge Aliasing occurs when you sample a signal (anything which repeats a cycle over time) too slowly (at a frequency comparable to or smaller than the signal being measured), and obtain an incorrect frequency and/or amplitude as a result.
As an example, let's say I have a ball that has three positions: 0 (middle), +1 (up), and -1 (down). Now let's say you want to measure this frequency, but you only look at the ball once every 5 seconds. But aliasing can get much more devious than this. Or how about if you look every two seconds, but you start looking half a second after t=0? So now that we've seen how much aliasing can mess with our ability to measure things, how do you get around it?
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