200 6. CONTINUOUS-TIME FOURIER TRANSFORM
Figure 6.28: Noise-reduction smartphone app.
6.3. EVALUATING PROPERTIES OF CTFT 201
(a) (b) (c)
Figure 6.29: (a) Plot of a segment of the original sine wave (z1), (b) the noisy signal (z2), and
(c) the noise-reduced signal (z3).
202 6. CONTINUOUS-TIME FOURIER TRANSFORM
(a) (b) (c)
Figure 6.30: (a) Plot of the magnitude of the original sine wave (y1), (b) the noisy signal (y2),
and (c) the noise-reduced signal (y3) in the frequency domain.

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