合并延迟单元

sunyuanxin

Consider a causal LTI system s whose input x[n] and output y[n] are related by the differential equation
2y[n]-y[n-1]+y[n-3]=x[n]-5x[n-4]
Show that the four delay elements in the block diagram representation of s obtained in part(e) may be collapsed to three. The resulting block diagram is referred to as a Direct Form II realization of s, while the block diagrams obtained in parts(d)and(e)are referred to as Direct Form I realization of s.