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Sampling Revisited — Aliasing in the Frequency Domain & Reconstruction
Inside this lesson
- Explain how sampling in time creates periodic replication of the spectrum in frequency
- Describe the Nyquist-Shannon sampling theorem as a consequence of non-overlapping spectral replicas
- Identify aliasing as spectral overlap and compute aliased frequencies for single sinusoids
- Understand ideal reconstruction via a brick-wall low-pass filter and its sinc-interpolation interpretation
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Educational content covering topics typical of a first- and second-year electrical engineering curriculum. Not a substitute for accredited coursework, and not suitable for real antenna, transmission-line, or signal-processing system design without review by a licensed professional engineer.