Translations:Digital linear time-invariant systems/40/en

In Figure 1, the forward direction (i.e., the direction from input to output) is from left to right. Because all of the arrows associated with the constant multipliers ${\beta }_{0},{\beta }_{1}$, ${\beta }_{2}...,\beta _{q}$ are in the forward direction, an MA system is seen to be a feedforward system. In a feedforward system, the present output $y_{k}$ depends on the present and past values $u_{k}$, $u_{k-1}$, $u_{k-2}$, ... of the input. In the case of an MA system, only a finite number q of past values are involved.