瀹為獙鎶ュ憡
璇剧▼鍚嶇О锛?/p>
鏁板瓧淇″彿澶勭悊
鎸囧鑰佸笀锛?/p>
鎴愮哗锛?/p>
__________________
瀹為獙鍚嶇О锛?/p>
DFT/FFT
鐨勫簲鐢ㄤ箣涓�
飩?/p>
纭畾鎬т俊鍙疯氨鍒嗘瀽
瀹為獙绫诲瀷锛?/p>
__
楠岃瘉
_
鍚岀粍瀛︾敓濮撳悕锛?/p>
鈥?/p>
涓�銆佸疄楠岀洰鐨勫拰瑕佹眰
璋卞垎鏋愬嵆姹備俊鍙风殑棰戣氨銆傛湰瀹為獙閲囩敤
DFT/FFT
鎶�鏈鍛ㄦ湡鎬т俊鍙疯繘琛岃氨鍒嗘瀽銆傞�氳繃瀹為獙锛屼簡瑙ｇ敤
X(k)
杩戜技鍦拌〃绀洪璋?/p>
X(ej
飦?/p>
)
甯︽潵鐨勬爡鏍忔晥搴斻�佹贩鍙犵幇璞″拰棰戣氨娉勬紡锛屼簡瑙ｅ浣曟纭湴閫夋嫨鍙傛暟锛堟娊鏍烽棿闅?/p>
T
銆佹娊鏍风偣鏁?/p>
N
锛夈�?/p>
浜屻�佸疄楠屽唴瀹瑰拰姝ラ
2-1
閫夌敤鏈�绠�鍗曠殑鍛ㄦ湡淇″彿锛氬崟棰戞寮︿俊鍙枫�侀鐜?/p>
f=50
璧吂锛岃繘琛岃氨鍒嗘瀽銆?/p>
2-2
璋卞垎鏋愬弬鏁板彲浠ヤ粠涓嬭〃涓换閫変竴缁勶紙涔熷彲鑷畾锛夈�傚鍚勭粍鍙傛暟鏃剁殑搴忓垪锛岃绠楋細涓�涓寮﹀懆鏈熸槸
鍚﹀搴旀暣鏁颁釜鎶芥牱闂撮殧锛熻瀵熷尯闂存槸鍚﹀搴旀暣鏁颁釜姝ｅ鸡鍛ㄦ湡锛?/p>
淇″彿棰戠巼
f
锛堣但鍏癸級
璋卞垎鏋愬弬鏁?/p>
鎶芥牱闂撮殧
T
锛堢锛?/p>
鎴柇闀垮害
N
锛堟娊鏍蜂釜鏁帮級
50
绗竴缁勫弬鏁?/p>
0.000625
32
50
绗簩缁勫弬鏁?/p>
0.005
32
50
绗笁缁勫弬鏁?/p>
0.0046875
32
50
绗洓缁勫弬鏁?/p>
0.004
32
50
绗簲缁勫弬鏁?/p>
0.0025
16
2-3
瀵逛互涓婂嚑涓寮﹀簭鍒楋紝渚濇杩涜浠ヤ笅杩囩▼銆?/p>
2-3-1
瑙傚療骞惰褰曚竴涓寮﹀簭鍒楃殑鍥惧舰锛堟椂鍩燂級銆侀璋憋紙骞呭害璋便�侀璋卞疄閮ㄣ�侀璋辫櫄閮級褰㈢姸銆佸箙搴?/p>
璋辩殑绗竴涓嘲鐨勫潗鏍囷紙
U
锛?/p>
V
锛夈�?/p>
2-3-2
鍒嗘瀽鎶芥牱闂撮殧
T
銆佹埅鏂暱搴?/p>
N
锛堟娊鏍蜂釜鏁帮級瀵硅氨鍒嗘瀽缁撴灉鐨勫奖鍝嶏紱
2-3-3
鎬濊�?/p>
X(k)
涓?/p>
X(e
j
飦?/p>
)
鐨勫叧绯伙紱
2-3-4
璁ㄨ鐢?/p>
X(k)
杩戜技琛ㄧず
X(ej
飦?/p>
)
鏃剁殑鏍呮爮鏁堝簲銆佹贩鍙犵幇璞°�侀璋辨硠婕忋�?/p>
涓夈�佷富瑕佷华鍣ㄨ澶?/p>
MATLAB
缂栫▼銆?/p>
涓撲笟锛?/p>
________________
濮撳悕锛?/p>
________________
瀛﹀彿锛?/p>
________________
鏃ユ湡锛?/p>
________________
鍦扮偣锛?/p>
________________