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# exp7 - Spectral Analysis of Digital Signals Julian...

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Spectral Analysis of Digital Signals Julian Weathersby Course: AME341 Lab Date: Tuesday, November 6, 2007 Lab Partners: Kazuma Kitagaito, Kyohci Onoue

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Julian Weathersby Spectral Analysis of Digital Signals II -65 -55 -45 -35 -25 -15 -5 5 0.1 1 10 100 1000 F (Hz) Figure 1: 200 Hz Sine wave signal with a 2V rms amplitude with a 500 Hz sampling frequency. The peak frequency is found to be 200.1953 Hz with an uncertainty of 0.0001 Hz based from the computer's output of the value at the peak. -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 1 10 100 1000 10000 f (Hz) Figure 2: 200 Hz square wave signal with a 2V rms amplitude with a 10 kHz sampling frequency. The peak frequency is 200.1953 Hz with a 0.0001 Hz uncertainty. This is at the initial peak. The continuing peaks were found to be 3fo, 5fo, and continuing.
Julian Weathersby Spectral Analysis of Digital Signals III -70 -60 -50 -40 -30 -20 -10 0 10 1 10 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 1 10 100 1000 10000 f (Hz) Figure 3: 2V rms sine wave at 2000 Hz with a sampling frequency of 10 kHz. Here the peak frequency is at about 2001.93 Hz with an uncertainty of 0.005 Hz Figure 4: 2V rms sine wave at 2000 Hz with a sampling frequency of 2.5 kHz to observed the aliased frequency. This is noted at the peak frequency, which is 500.49 Hz with an uncertainty of 0.005 Hz.

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Spectral Analysis of Digital Signals IV -1 0 1 2 3 4 5 6 0.00E+00
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exp7 - Spectral Analysis of Digital Signals Julian...

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