Hybrid system
A hybrid system consists of both discrete signals and continuous signals. Whether a particular signal in a given system is seen as discrete or continuous, is ultimately a
modeling question. So, a more accurate (still informal) description would be:
a hybrid model of a system consists of both discrete signals (or variables) and continuous
signal or variables.
A canonical example of a hybrid model is an electronic thermostat, where the
temperature, a physical quantity, is modeled as a continuous variable and the state of the
heater switch (on/off) is modeled as a discrete variable.
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