This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
AliasedSpectrum. Hypothetical spectrum of inadequately sampled bandlimited signal where the images overlap showing how aliases are created blue and XAdifferentAsthe sampled sequences are identicalAsAs such that the green images in the top figure do not overlap the blue portion Created by Robert BristowJohnson for use in Commons