Section 2: Review of analogue signals & systems

: An example of an LTI analogue system is a simple RC low-pass filter (fig 2.1) with input voltage x(t) and output voltage y(t). In general we can represent such a system as a "black box" (fig 2.2) with input x(t) and output y(t), where x(t) and y(t) may be voltages or currents. ................
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