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Key to Signals & Systems 2014-11-26 5
63 ȫʱźŵ˫˹任˫˹任⣬
رעָROC:ͬROCвͬ⡣ 64 ʱ3̵ַģͼƵ3״ݺֱģͼ
ģͼģͼͼblockźͼϹ淶 65 ϵͳԡʵԣʵϵȶα㼫λϣ 66 ȫͨС綨壬ʲôص㣿㡢кرλã 67 ƵBode ͼʾȡ̶ȣкص㣿кα 68 ȶϵͳijҪh(t)Hsٽȶϵͳʲôص㣿
69 ɢʱźšźšȲźšǾȲָʲôһ 70 Tcźx(t),Ϊ1һڵɢ
ţ2һڵɢźš
71 źתź,Щ
72 ȲźŵƵԭźŵƵкβͬϵ 73 źƵfHzģƵʦأ/룩ֽƵʦȣ
TTΪȲڡЩ塣
74 һ֪IJźŵƵףźĵƵfmax
NyquistƵʡƵfs۵Ƶf0źŵƵȡ 75 һͨźžȲҪܹȫָͲƵʿΪ
٣ͼ˵
76 ùʽͼ˵ʱɢӦƵڻƵɢӦʱ
Ĺ̡
77 ˫УУУ(ʱ)СС
СеѧʾͼΣԼӦZ任ROC 78 еλƣӳ٣ǰƣۣͣ㡣
79 λ?[k],ƵλֵУλ뵥λ弤?(t)
λ弤?(KT)𣻵λԾu[k]u(t)u(KT)дu[k]?[k]Ĺϵʽбʽ
80 NɢϵͳIJ̵ַģͼò̵ַַ̽ķ 81 ̵ַӦȻӦ⡣
82 ̵ַ״̬ӦκʼбʾɵλеĺͣӶɢ
ϵͳеӦͿԱʾϵͳĵλӦh(n)ϡ͡ͼ720̡ 83 ɢϵͳĵλӦh(n)
84 ˫Z任Ķ壬Ӧ塣任
ROC
85 еZ任߱任ʽ˫߱任ʽȷ 86 Z任ľֵֵʹ 87 Z任2ַַʽͬҪжϼROC
⣬ӦұлУʱעZ0ļ㡣
Key to Signals & Systems 2014-11-26 6
88 źŵIJеZ任FzֱӴźŵ˹
F(s)ãνУ˵رƹ˫źŵ 89 Z任ɢݺH(z)ĸɢϵͳӦȫӦ
Ӧ״̬Ӧɢ̵ĸȷϵͳӦʽԼбϵͳȶԡ
90 ɢϵͳƵԵĶH(z)|Z|1ɢָмϵͳ
̬ӦȼɢҼϵͳӦƵԣƵƵкص㣿Ǧص2ڣԳԣ
91 ʱLTIϵͳ״ַ̬̣ͼABCD 92 ϵͳH(S)ͼABCD(״̬̺) 93 ״̬̺ABCDݺH(S)
иϰҪ㣬ҿαӦݡ