Anti-aliasing filter  From Wikipedia, the free encyclopedia Jump
to: navigation, search  An anti-aliasing filter is a filter used
before a signal sampler, to restrict the bandwidth of a signal
to approximately satisfy the sampling theorem. Since the theorem
states that unambiguous interpretation of the signal from its
samples is possible when the power of frequencies above the
Nyquist frequency is zero, a real anti-aliasing filter can
generally not completely satisfy the theorem. A realizable anti-
aliasing filter will typically permit some aliasing to occur;
the amount of aliasing that does occur depends on a design
trade-off between reduction of aliasing and maintaining signal
up to the Nyquist frequency and the frequency content of the
input signal.  Optical applications[edit]    Sensor based anti-
aliasing filter simulation[edit]   Audio applications[edit]
Anti-aliasing filters are commonly used at the input of digital
signal processing systems, for example in sound digitization
systems; similar filters ar