Digital Control Systems [MEE 4003] - Kckong.info

1.1. PROBLEM DEFINITION 7
Figure 1.5: 8-channel digital-to-analog converter Cirrus Logic CS4382 as used
in a soundcard.
0.9
0.8
0.7
0.6
Amplitude
0.5
0.4
0.3
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T
0.1
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Time (sec.)
Figure 1.6: The definition of sampling period.
1.1.7 Sampling Rate
The sampling rate, sample rate, or sampling frequency defines the number of samples
per unit of time (usually seconds) taken from a continuous signal to make a discrete
signal. For time-domain signals, the unit for sampling rate is hertz[Hz] (inverse seconds,
1/s, s −1 ), sometimes noted as Sa/s (samples per second). The inverse of the sampling
frequency is the sampling period or sampling interval, which is the time between samples.
T shown in Fig. 1.6 is the sampling period, and 1 is the sampling frequency.
T
Digital Control Systems, Sogang University
Kyoungchul Kong