Abstract
An invited paper for a special session entitled “My Favorite Signal Processing Homework Problems.” Abstract: The use of recorded real-world audio signals tends to motivate almost all of the students in our signal processing classes. Early in any course where analog-to-digital conversion is presented, the topic of aliasing is always discussed. One of our favorite, three-part homework problems is to: 1. import an instructor provided recording of an audio frequency whistle (a chirp) into MATLAB, 2. plot its spectrogram, and 3. identify aliasing on the spectrogram. Given the rich harmonic structure of the provided signal, aliasing is clearly present on the properly implemented spectrogram.
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