-
鏉ユ簮缃戠粶锛屼粎渚涗釜浜哄涔犲弬鑰?/p>
涓�銆佸～绌洪锛堟瘡绌?/p>
1
鍒?/p>
,
鍏?/p>
10
鍒嗭級
1
锛庡簭鍒?/p>
(
)
sin(3
/
5)
x
n
n
飦?/p>
飥?/p>
鐨勫懆鏈熶负
10
銆?/p>
2
锛庣嚎鎬ф椂涓嶅彉绯荤粺鐨勬�ц川鏈?/p>
浜ゆ崲
寰嬨�?/p>
缁撳悎
寰嬨�?/p>
鍒嗛厤
寰嬨�?/p>
3
锛庡
4
(
)
(
)
x
n
R
n
飥?/p>
鐨?/p>
Z
鍙樻崲涓猴紝鍏舵敹鏁涘煙涓?/p>
|Z|>0
銆?/p>
4
锛庢娊鏍峰簭鍒楃殑
Z
鍙樻崲涓庣鏁ｅ倕閲屽彾鍙樻崲
DFT
鐨勫叧绯讳负
k
N
j
e
Z
飦?/p>
2
飥?/p>
銆?/p>
5
锛庡簭鍒?/p>
x(n)=(1
锛?/p>
-2
锛?/p>
0
锛?/p>
3
锛?/p>
n=0
锛?/p>
1
锛?/p>
2
锛?/p>
3),
鍦嗗懆宸︾Щ
2
浣嶅緱鍒扮殑搴忓垪涓?/p>
{0
锛?/p>
3
锛?/p>
1
锛?/p>
-2;n=0,1,2,3}
銆?/p>
6
锛庤
LTI
绯荤粺杈撳叆涓?/p>
x(n)
锛岀郴缁熷崟浣嶅簭鍒楀搷搴斾负
h(n)
锛屽垯绯荤粺闆剁姸鎬佽緭鍑?/p>
(
)
(
)
(
)
y
n
x
n
h
n
飥?/p>
飥?/p>
銆?/p>
7
锛庡洜鏋滃簭鍒?/p>
x(n)
锛屽湪
Z
鈫掆垶鏃讹紝
X(Z)=
x(0)
銆?/p>
浜屻�佸崟椤归�夋嫨棰橈紙姣忛
2
鍒?/p>
,
鍏?/p>
20
鍒嗭級
1
锛?/p>
未
(n)
鐨?/p>
Z
鍙樻崲鏄紙
A
锛?/p>
A.1
B.
未
(
蠅
)C.2
蟺
未
(
蠅
)D.2
蟺
2
锛庡簭鍒?/p>
x
1
锛?/p>
n
锛夌殑闀垮害涓?/p>
4
锛屽簭鍒?/p>
x
2
锛?/p>
n
锛夌殑闀垮害涓?/p>
3
锛屽垯瀹冧滑绾挎�у嵎绉殑闀?/p>
搴︽槸锛?/p>
C
锛?/p>
A.3B.4
C.6
D.7
3
锛?/p>
LTI
绯荤粺锛岃緭鍏?/p>
x
锛?/p>
n
锛夋椂锛岃緭鍑?/p>
y
锛?/p>
n
锛?/p>
锛涜緭鍏ヤ负
3x
锛?/p>
n-2
锛?/p>
锛岃緭鍑轰负锛?/p>
B
锛?/p>
A.y
锛?/p>
n-2
锛?/p>
B.3y
锛?/p>
n-2
锛?/p>
C.3y
锛?/p>
n
锛?/p>
D.y
锛?/p>
n
锛?/p>
4
锛庝笅闈㈡弿杩颁腑鏈�閫傚悎绂绘暎鍌呯珛鍙跺彉鎹?/p>
DFT
鐨勬槸锛?/p>
D
锛?/p>
A.
鏃跺煙涓虹鏁ｅ簭鍒楋紝棰戝煙涓鸿繛缁俊鍙?/p>
B.
鏃跺煙涓虹鏁ｅ懆鏈熷簭鍒楋紝棰戝煙涔熶负绂绘暎鍛ㄦ湡搴忓垪
C.
鏃跺煙涓虹鏁ｆ棤闄愰暱搴忓垪锛岄鍩熶负杩炵画鍛ㄦ湡淇″彿
D.
鏃跺煙涓虹鏁ｆ湁闄愰暱搴忓垪锛岄鍩熶篃涓虹鏁ｆ湁闄愰暱搴忓垪
5
锛庤嫢涓�妯℃嫙淇″彿涓哄甫闄愶紝涓斿鍏舵娊鏍锋弧瓒冲濂庢柉鐗规潯浠讹紝鐞嗘兂鏉′欢涓嬪皢鎶芥牱
淇″彿閫氳繃鍗冲彲瀹屽叏涓嶅け鐪熸仮澶嶅師淇″彿锛?/p>
A
锛?/p>
A.
鐞嗘兂浣庨�氭护娉㈠櫒
B.
鐞嗘兂楂橀�氭护娉?/p>
鍣?/p>
C.
鐞嗘兂甯﹂�氭护娉㈠櫒
D.
鐞嗘兂甯﹂樆婊ゆ尝鍣?/p>
6
锛?/p>
涓?/p>
鍒?/p>
鍝?/p>
涓�
涓?/p>
绯?/p>
缁?/p>
鏄?/p>
鍥?/p>
鏋?/p>
绯?/p>
缁?/p>
锛?/p>
B
锛?/p>
A.y(n)=x(n+2)
B.y(n)=cos(n+1)x(n)
C.y(n)=x(2n)D.y(n)=x(-n)
7
锛庝竴涓嚎鎬ф椂涓嶅彉绂绘暎绯荤粺绋冲畾鐨勫厖瑕佹潯浠舵槸鍏剁郴缁熷嚱鏁扮殑鏀舵暃鍩熷寘鎷紙
C
锛?/p>
A.
瀹炶酱
B.
鍘熺偣
C.
鍗曚綅鍦?/p>
D.
铏氳酱
8
锛庡凡鐭ュ簭鍒?/p>
Z
鍙樻崲鐨勬敹鏁涘煙涓猴綔
z
锝?/p>
>2
锛屽垯璇ュ簭鍒椾负锛?/p>
D
锛?/p>
A.
鏈夐檺闀垮簭鍒?/p>
B.
鏃?/p>
闄愰暱搴忓垪
C.
鍙嶅洜鏋滃簭鍒?/p>
D.
鍥犳灉搴忓垪
9
锛庤嫢搴忓垪鐨勯暱搴︿负
M
锛岃鑳藉鐢遍鍩熸娊鏍蜂俊鍙?/p>
X(k)
鎭㈠鍘熷簭鍒楋紝鑰屼笉鍙戠敓鏃?/p>
鍩熸贩鍙犵幇璞★紝鍒欓鍩熸娊鏍风偣鏁?/p>
N
闇�婊¤冻鐨勬潯浠舵槸
(A)
A.N鈮
B.N鈮C.N鈮?MD.N鈮?M