PowerPoint Presentation

Aliasing


q	The variances at frequency
	higher than the Nyquist

	frequency (k>k*) will be

	“aliased” into lower

	frequency (k<k*) in the

	power spectrum. This is the

	so-called “aliasing problem”.

q	This is a problem if there are

	large variances in the data

	that have frequencies smaller

	than k*.