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0xfe/sine-wave-fft.py

Created February 27, 2020 22:29
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FFT of Sine Wave
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sine-wave-fft.py
# Generate an integer-period sine wave to
# eliminate spectral leak.
hz = 20
x = np.linspace(0, 2 * np.pi * hz, 128 * hz)
y = np.sin(x)
plt.figure(figsize=(10, 3))
plt.plot(x, y)
plt.show()
# We're only interested in the real components
fft_y = fft.rfft(y) / (len(x) / 2)
plt.figure(figsize=(10, 3))
plt.bar(np.arange(100), np.absolute(fft_y)[:100]) # Show just the first 100 bins
plt.show()
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