问答题
求图示系统输出信号的z变换。
【正确答案】
【答案解析】由图知
C(s)=G(S)R(S)-H 1 (s)G(s)N*(s)
N(s)=G(s)H 2 (s)R(s)-H 2 (s)G(s)H 1 (s)N*(s)
对上式取z变换后可得
将C(s)=G(s)R(s)-H 1 (s)G(s)N*(s)取z变换并代入上式得
C(s)=G(S)R(S)-H 1 (s)G(s)N*(s)
N(s)=G(s)H 2 (s)R(s)-H 2 (s)G(s)H 1 (s)N*(s)
对上式取z变换后可得
将C(s)=G(s)R(s)-H 1 (s)G(s)N*(s)取z变换并代入上式得