6.01 Lecture Notes - Lecture 6: Ad-Damazin, Moroccan Riad
22 May 2016
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The system transforms an input signal into an output signal. A signal is a mathematical function with an independent variable (i. e. time) and dependent variable. The system is described by the way that it transforms the input signal into the output signal. All useful models focus on the most relevant signals and ignore those of lesser signi cance. Check yourself 1: list at least four possible output signals for the car-steering problem. In a composite system the steering controller determines (t), which is input into the car. The car generates po(t), which is subtracted from pi(t) to get e(t) which is input to the steering controller. The triangular component is called a gain or scale of -1. Its output is equal to -1 times its input. The triangle symbol is used to indicate that we are multiplying all the values of the signal by a numerical constant, which is shown inside the triangle.
