An alias signal is:
A) a signal that has a frequency equal to the difference between the applied analog frequency and the sampling frequency.
B) usually filtered out by anti-aliasing filters in PCM systems
C) a signal that forms in a PCM system that has failed to meet the Nyquist sampling rate
D) all of the above

Question

Quizplus · Accepted Answer

Alias signals are created when the sampling rate is below the Nyquist rate, leading to frequencies that mirror around the Nyquist frequency. Anti-aliasing filters are used to prevent these unwanted frequencies from appearing in the sampled signal.

An Alias Signal Is