時變系統與非時變系統

  時不變系統是指系統的零狀态輸出波形僅取決于系統輸入波形和系統特性，而與輸入信号接入系統的時間無關。即

若           x ( t ) → y ( t ) , x(t)\rightarrow y(t), x(t)→y(t),

則         x ( t − t 0 ) → y ( t − t 0 ) . x(t-t_0)\rightarrow y(t-t_0). x(t−t0​)→y(t−t0​).

其中 t 0 t_0 t0​ 為輸入延時。如下圖所示

這是黑體字

  A time-variant system is a system whose output response depends on moment of observation as well as moment of input signal application. In other words, a time delay or time advance of input not only shifts the output signal in time but also changes other parameters and behavior. Time variant systems respond differently to the same input at different times. The opposite is true for time invariant systems (TIV).