Figure 3.1: Sampling
The sine wave in figure
3.1
is sampled at the dot positions. By connecting the
adjacent samples, the original signal can be reconstructed from the samples. You
can see the result in figure 3.2.
Figure 3.2: "connecting" the samples
3.2
Sample frequency
The rate at which the samples are taken is called the sampling frequency, the
number of samples per second. A higher sampling frequency corresponds to a
shorter interval between the samples. As is visible in figure 3.3, with a higher
sampling frequency, the original signal can be reconstructed much better from
the measured samples.
6
Chapter 3
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