Feedback is extensively used in control theory, using a variety of methods including state space (controls), full state feedback, and so forth. Note that in the context of control theory, "feedback" is traditionally assumed to specify "negative feedback". The most common general-purpose controller using a control-loop feedback mechanism is a proportional-integral-derivative (PID) controller. Heuristically, the terms of a PID controller can be interpreted as corresponding to time: the... See More
Both in nature and engineered systems, many signals are modulated onto carriers. This provides some immunity to baseline noise and DC level shifts. We see many of these modulated signals in various position and velocity sensors (as well as others). Unfortunately, most control engineers are not taught enough about how to efficiently demodulate these signals so as to minimize the noise, nonlinearities, and time delay in the extracted information. This topic covers some of the ways in which control... See More
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