In my control theory text book, frequency response descriptions is one of three main areas of the subject (the others being Laplace transfer functions and state space representations).(adsbygoogle = window.adsbygoogle || []).push({});

My questions are: What is the purpose with frequency response in control theory? Why are not transfer functions and state space representations good enough? In what context does frequency response appear? Are there any concrete physical examples where one needs the methods of frequency response (my book doesn't give any...)?

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# Control theory: Frequency response

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