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demo 13 exercise 1
1. Amplitude Modulation. Modify the Python program plot_microphone_input_spectrum so
it applies amplitude modulation (AM) to the microphone input audio signal. The program should
plot the live frequency spectra (Fourier transform) of both the input and output signals (use
two different colors and/or two subplots to distinguish the two signals). The Fourier transform
should be computed using the FFT. The program should also play the output (result of AM)
to the speaker/headphones. What is the expected relation between the frequency spectra of the
output and input signals? Do the input and output spectra you observe match the theory?
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