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system
an entity that processes a set of signals ( inputs) to yield another set of signals (outputs)
system diagram
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linear system
obeys the principle of superposition
aX1+bX2 → aY1+bY2
convolution
convolution in time domain = multiplication in frequency domain
y(t)= x(t) * h(t) → Y(w) = X(w) x H(w)
graphing frequency spectrum
single sided: A=A, one for Amp vs. rad and one for phase vs rad
double sides: A= A/2, one for Amp vs rad and one for phase vs rad