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Aliasing and the Sampling Theorem

Aliasing and the Sampling Theorem

Discover how the sampling theorem acts as a fundamental limit on the sample rate beyond which distortion in the signal is unavoidable.

We have learned that spectral aliases arise after sampling at integer multiples of the sample rate fsf_s. An example of this is shown in the figure below:

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Spectral replicas arise after sampling
Spectral replicas arise after sampling

We’ll now look at the sampling theorem, which puts a fundamental limit on the sample rate for signal representation in discrete time.

Background

How should we choose the sample rate fsf_s?

  • We know that a closer time spacing, i.e., a smaller TsT_s, produces a better approximation of the signal in discrete time and pushes the spectral aliases further away due to the large fsf_s
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