鏁板瓧淇″彿澶勭悊涓婃満鎶ュ憡
瀹為獙涓夈�佷俊鍙风殑棰戝煙涓?/p>
Z
鍩熷垎鏋?/p>
鐝骇锛?/p>
瀛﹀彿锛?/p>
濮撳悕锛?/p>
鎴愮哗锛?/p>
1
瀹為獙鐩殑
锛?/p>
1
锛夌悊瑙ｅ簭鍒楃鏁ｅ倕閲屽彾鍙樻崲锛?/p>
DTFT
锛夌殑瀹氫箟锛岀啛鎮夊簭鍒?/p>
DTFT
鐨勮绠楀強鍏朵富瑕佹�ц川锛?/p>
锛?/p>
2
锛夋帉鎻?/p>
Z
鍙樻崲鐨勮绠楀拰涓昏鎬ц川锛岀啛鎮?/p>
Z
鍙樻崲鐨勬敹鏁涘煙鍙婂叾涓庡簭鍒楃壒鎬х殑鍏崇郴锛屼互
鍙?/p>
Z
鍙樻崲涓?/p>
DTFT
鐨勫叧绯伙紱
锛?/p>
3
锛夋帉鎻℃椂鍩熺鏁ｇ嚎鎬ф椂涓嶅彉绯荤粺鐨勯鍩熷垎鏋愭柟娉曪紝娣卞埢鐞嗚В绯荤粺鐨勯鐜囧搷搴斻�備簡瑙?/p>
绯荤粺鐨勭ǔ鎬佸搷搴斿拰鏆傛�佸搷搴斻�佺浉浣嶅欢杩熷拰缇ゅ欢杩熺瓑姒傚康锛?/p>
锛?/p>
4
锛夋帉鎻℃椂鍩熺鏁ｇ嚎鎬ф椂涓嶅彉绯荤粺鐨?/p>
z
鍩熷垎鏋愭柟娉曪紝娣卞埢鐞嗚В绂绘暎绯荤粺鐨勭郴缁熷嚱鏁板強
鍏堕浂鏋佺偣鍒嗗竷锛?/p>
鐔熸倝闆舵瀬鐐瑰垎甯冧笌绯荤粺鐨勫洜鏋滄�у拰绋冲畾鎬у叧绯汇�?/p>
闆舵瀬鐐瑰垎甯冨绯荤粺棰戠巼鐗规�?/p>
鐨勫奖鍝嶃�佸樊鍒嗘柟绋嬬殑
Z
鍙樻崲瑙ｆ硶绛夛紱
2
瀹為獙鍐呭
锛?/p>
1
锛?/p>
璁捐璁＄畻鏈虹▼搴忥紝浜х敓搴忓垪骞惰绠楀簭鍒楃殑
DTFT
锛岀粯鍒跺叾骞呴鐗规�у拰鐩搁鐗规�ф洸
绾匡紱
锛?/p>
2
锛?/p>
鏍规嵁绯荤粺鐨勫崟浣嶈剦鍐插搷搴斿拰宸垎鏂圭▼锛?/p>
璁＄畻绯荤粺鐨勯鐜囧搷搴旓紝
缁樺埗绯荤粺棰戠巼鍝嶅簲
鐨勫箙棰戠壒鎬у拰鐩搁鐗规�ф洸绾匡紱
锛?/p>
3
锛?/p>
鏍规嵁绯荤粺鐨勫崟浣嶈剦鍐插搷搴斿拰宸垎鏂圭▼锛?/p>
璁＄畻绯荤粺鐨勭郴缁熷嚱鏁般�?/p>
闆舵瀬鐐瑰垎甯冿紱
鏀瑰彉
绯荤粺鐨勯浂鏋佺偣鍒嗗竷锛岃瀵熺郴缁熼鐜囧搷搴旂殑鍙樺寲銆?/p>
3
瀹為獙姝ラ
锛?/p>
1
锛夎璁℃湁闄愰暱搴忓垪
Rn
锛涜绠楀簭鍒楃殑
DTFT
锛岀粯鍒跺箙棰戠壒鎬у拰鐩搁鐗规�ф洸绾?/p>
锛?/p>
2
锛夋敼鍙樼郴缁熺殑绯荤粺鍑芥暟鐨勯浂鐐瑰垎甯冿紝缁樺埗绯荤粺鏀瑰彉鍓嶅拰鏀瑰彉鍚庣殑棰戠巼鍝嶅簲鐨勫箙棰戠壒
鎬у拰鐩搁鐗规�ф洸绾?/p>
4
绋嬪簭璁捐
x=[1,1,1,1];nx=[0:3];%x(n)=R(n)
w=linspace(-2.8*pi,2.8*pi,100000);%
鍙?/p>
100000
涓偣