Can anyone tell me what an anti-aliasing filter is and how it is used?
Aliasing is an undesired effect in the use of analog-to-digital converters. Frequency components above the the Nyquist band (above half the sampling frequency) get "mirrored" into lower frequencies inside the Nyquist band. Once a high frequency has been aliased, there is no way to distinguish it from a real low-frequency signal.
An anti-aliasing filter is a low-pass filter, put before the ADC, that attenuates frequency components above the Nyquist band.
Thanks. I appreciate it.
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