Discrete Systems Discrete-Time Signals and Systems--Digital Signal Processing Mathematically,an operation T[.] *y(n)=T[x(n)] *x(n):excitation,input signal *y(n):response,output signal Classification Linear systems Nonlinear systems 上游充通大学Discrete Systems Discrete-Time Signals and Systems —— Digital Signal Processing  Mathematically, an operation T[.] y(n) = T [ x(n)] x(n): excitation, input signal y(n): response, output signal  Classification Linear systems Nonlinear systems