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The interpolation method is a processing method to connect the sampled points, using some points to
calculate the whole appearance of the waveform. Select the appropriate interpolation method according to
the actual signal.
Sine (x) / x-interpolation: Connect the sampled points with curved lines.
Linear interpolation: Connect the sampled points with straight lines. This method is suitable for reconstructing
the straight-line signals, such as the square wave or pulse wave.
Figure 4-3 Sine(x)/x interpolation