电子科技大学《信号与系统》20秋期末考试
电子科技大学《信号与系统》20秋期末考试1.[单选题] 序列和<img id="ODmatzjTEMP20200708115355351.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODmatzjTEMP20200708115355351.png?Expires=1909540435&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SZX%2BF1c02c92x/R2MKb6jY0c2%2Bk%3D" />等于 ( )。
A.<img id="ODnbympTEMP20200708115355616.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODnbympTEMP20200708115355616.png?Expires=1909540435&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=8hkXPacdvkRNxsxC6UZT8Oc%2BckE%3D" />
B.1
C.u(k-1)
D.ku(k-1)
答:——B——
2.[单选题] 最小相移网络可以用()表示
A.最小相移网络和全通网络的串联
B.最小相移网络和全通网络的级联
C.高通滤波网络和全通网络的串联
D.高通滤波网络和全通网络的级联
答:——B——
3.[单选题] <img id="ODllugfTEMP20200708115425785.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODllugfTEMP20200708115425785.png?Expires=1909540466&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=uHSWNOzeMdu3wEh4xStEp1Rzx%2B0%3D" />，属于其极点的是( )。
A.3
B.-3
C.1
D.0
答:——A——
4.[单选题] 设<img id="ODerwdoTEMP20200708115415682.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODerwdoTEMP20200708115415682.png?Expires=1909540455&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=5qKrPfZ%2Bajg/ATriWW1Uz%2Bs/UxY%3D" />是基本周期为<img id="ODkxhpfTEMP20200708115415854.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODkxhpfTEMP20200708115415854.png?Expires=1909540456&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=wYHTRB6YbPhs7w4MtM2Ouq3SZqQ%3D" />的周期信号，其傅氏系数为<img id="ODnhuwaTEMP20200708115416034.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODnhuwaTEMP20200708115416034.png?Expires=1909540456&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=NELv1Q%2BCwcyjhPkggGhp/iE/fdQ%3D" />。则<img id="ODfcjopTEMP20200708115416193.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODfcjopTEMP20200708115416193.png?Expires=1909540456&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=sWKcVlrGGJpOALjAIvlu3gcdWPs%3D" />的傅氏系数<img id="ODcgzciTEMP20200708115416461.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODcgzciTEMP20200708115416461.png?Expires=1909540456&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SLt91aEbCPtQoX%2Bg7EqtpgPmGhM%3D" />为( )。
A.<img id="ODgukivTEMP20200708115416596.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODgukivTEMP20200708115416596.png?Expires=1909540456&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=HcNeTrYz1GzcLB93rpmhWM6/Ps0%3D" />
B.<img id="ODbzxwiTEMP20200708115416902.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODbzxwiTEMP20200708115416902.png?Expires=1909540456&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=PkKGICvXi5qc5r%2B0bLnSCtBAsyE%3D" />
C.<img id="ODqnooqTEMP20200708115417016.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODqnooqTEMP20200708115417016.png?Expires=1909540457&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Y/5C1db050JMAmM6Ph1SYUHelGI%3D" />
D.<img id="ODbvyxzTEMP20200708115417321.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODbvyxzTEMP20200708115417321.png?Expires=1909540457&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=YMMRLzdwQCll2PqgfD8rn3b4Bcw%3D" />
答:————
5.[单选题] 函数<img id="ODtqzmoTEMP20200708115426082.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODtqzmoTEMP20200708115426082.png?Expires=1909540466&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=vwqsWTHuqefdz3990eDVotDqYsU%3D" />的单边拉普拉斯变换为( )。
A.<img id="ODubxdhTEMP20200708115426281.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODubxdhTEMP20200708115426281.png?Expires=1909540466&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=6rTnEsP9KQGHE8ZwmxeluMvJI3c%3D" />
B.<img id="ODffztmTEMP20200708115426467.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODffztmTEMP20200708115426467.png?Expires=1909540466&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=H9xemziUJiY4FgnFhE5cl0a%2BQDI%3D" />
C.<img id="ODmkgtkTEMP20200708115426573.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODmkgtkTEMP20200708115426573.png?Expires=1909540466&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=euewkS8i35L5VKxwhAbA1pnVtPk%3D" />
D.<img id="ODxnuplTEMP20200708115426775.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODxnuplTEMP20200708115426775.png?Expires=1909540466&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=pkIQb4Qf46UjKm71uhw3pjF9Aog%3D" />
答:————
6.[单选题] 离散信号f是指 ( )。
A.n的取值是连续的，f的取值是任意的信号
B.n的取值是离散的，而f的取值是任意的信号
C.n的取值是连续的，而f的取值是连续的信号
D.n的取值是连续的，而f的取值是离散的信号
答:————
7.[单选题] 若x是奇信号，则<img id="ODlraohTEMP20200708115352957.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODlraohTEMP20200708115352957.png?Expires=1909540433&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=qDLo9polVhh5mFGMoQ1e0vOflrk%3D" />( )。
A.0
B.<img id="ODushgmTEMP20200708115353355.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODushgmTEMP20200708115353355.png?Expires=1909540433&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=hLm0TXip1VOq0/G5CLzbC9B%2Bs0U%3D" />
C.<img id="ODfadtvTEMP20200708115353535.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODfadtvTEMP20200708115353535.png?Expires=1909540433&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SqvPtrvyE12O7Iw5z9IsAWir6Gw%3D" />
D.<img id="ODtjbwgTEMP20200708115353702.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODtjbwgTEMP20200708115353702.png?Expires=1909540433&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=mixS76LXE%2BYxEMkXdiyCjOjVA98%3D" />
答:————
8.[单选题] 因果稳定的连续系统，其系统函数<img id="ODpnuosTEMP20200708115422712.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODpnuosTEMP20200708115422712.png?Expires=1909540462&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=kxE/ctnMK2Jr4u/%2BneVX70V1Kjs%3D" />的全部极点须分布在复平面的( )。
A.左半平面
B.右半平面
C.虚轴上
D.虚轴或左半平面
答:————
9.[单选题] 对于信号<img id="ODfmhfuTEMP20200708115353844.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODfmhfuTEMP20200708115353844.png?Expires=1909540434&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=tq7RnoNnCPUThmOaC%2BkBI6TyiMM%3D" /> ( )。
A.非周期信号
B.周期信号，最小周期为 ?<img id="ODpjiafTEMP20200708115354120.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODpjiafTEMP20200708115354120.png?Expires=1909540434&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=gOkjCAukIfUfAUGehvnCII6m9%2BY%3D" />
C.周期信号，最小周期为 ?2<img id="ODvlozbTEMP20200708115354494.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODvlozbTEMP20200708115354494.png?Expires=1909540434&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=e4v4QsIWLcTwMYeMzzJEJj28eXI%3D" />
D.周期信号，最小周期为 ?<img id="ODefuquTEMP20200708115354660.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODefuquTEMP20200708115354660.png?Expires=1909540434&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=8nMJ7DPyiDqypZfZDxsUnZ9cDcM%3D" />
答:————
10.[单选题] 连续周期信号<img id="ODqglniTEMP20200708115418589.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODqglniTEMP20200708115418589.png?Expires=1909540458&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=uLVKum2a/w23WusmQm0M/jKbVkM%3D" />的频谱<img id="ODavyqfTEMP20200708115418749.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODavyqfTEMP20200708115418749.png?Expires=1909540458&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=mRgol0blXHsI4T4FyaJnZWOMt0Q%3D" />的特点是( )。
A.周期、连续频谱
B.周期、离散频谱
C.连续、非周期频谱
D.离散、非周期频谱
答:————
11.[单选题] 求<img id="ODkfnynTEMP20200708115402062.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODkfnynTEMP20200708115402062.png?Expires=1909540442&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=kGWDxNKT%2BbOFoIh3GP3JGQvGCIQ%3D" /> z变换的收敛域( )
A.2<|z|<3
B.<img id="ODvriuwTEMP20200708115402273.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODvriuwTEMP20200708115402273.png?Expires=1909540442&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=tIwxJdK1uFH088pTm/EC%2BwYXDoM%3D" /><|z|<2
C.|z|<3
D.|z|>2
答:————
12.[单选题] 已知某因果系统的系统函数为<img id="ODuucojTEMP20200708115428090.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODuucojTEMP20200708115428090.png?Expires=1909540468&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=YnJx3hArfumfZZhX5ArsC4gxsEk%3D" />,则该系统一定是( )。
A.稳定系统
B.不稳定系统
C.临界稳定系统
D.无法确定
答:————
13.[单选题] 符号函数<img id="ODppcuaTEMP20200708115409010.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODppcuaTEMP20200708115409010.png?Expires=1909540449&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=E0S03%2BjQtrUjocQAfcKVEFWmhbw%3D" />的傅里叶变换为( )。
A.<img id="ODgmdmxTEMP20200708115409091.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODgmdmxTEMP20200708115409091.png?Expires=1909540449&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=xaN6d3svCaTd9d3URA0Vj4dJfSU%3D" />
B.<img id="ODvqtdoTEMP20200708115409375.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODvqtdoTEMP20200708115409375.png?Expires=1909540449&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=iOKngfQ1SCF41LG6StsjGEjYQVY%3D" /><br><img id="ODpnldlTEMP20200708115409519.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODpnldlTEMP20200708115409519.png?Expires=1909540449&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=HKTdOprLaS60I2f4OcgU56ltYD4%3D" />
C.<img id="ODggtxdTEMP20200708115409599.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODggtxdTEMP20200708115409599.png?Expires=1909540449&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=PP91WHaOgGadMZ7vOVPHmlPaf2E%3D" />
D.<img id="ODhllvrTEMP20200708115409767.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODhllvrTEMP20200708115409767.png?Expires=1909540449&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=TujzhKV5pmzfCY6vxWwr925Yxds%3D" />
答:————
14.[单选题] 若<img id="ODrxktkTEMP20200708115423101.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODrxktkTEMP20200708115423101.png?Expires=1909540463&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=LpOYt13xwYy2gYjIcigvSXILJ3U%3D" />为有限持续时间信号，则其拉普拉斯变换收敛域为( )。
A.S平面内的带状区域
B.整个S平面
C.最右边极点的右半平面
D.最左边极点的左半平面
答:————
15.[单选题] 已知系统的差分方程表达式为<img id="ODfegrbTEMP20200708115406696.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODfegrbTEMP20200708115406696.png?Expires=1909540446&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=fqk7oo3zjRJ8AfYM%2B1koBMWh7OU%3D" /> 若边界条件y(-1)=1,则系统的完全响应为()
A.<img id="ODblglnTEMP20200708115406930.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODblglnTEMP20200708115406930.png?Expires=1909540447&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=5/FDx3wrsPFi4m2TRxznoX6Njqw%3D" />
B.<img id="ODmpdldTEMP20200708115407244.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODmpdldTEMP20200708115407244.png?Expires=1909540447&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=tymUk7CClPqSOzM/z5EoLi1GTcE%3D" />
C.<img id="ODwugrdTEMP20200708115407488.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODwugrdTEMP20200708115407488.png?Expires=1909540447&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=dYxlPYaucSQcS0deNmTKeI6lCQk%3D" />
D.<img id="ODkqlnaTEMP20200708115407635.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODkqlnaTEMP20200708115407635.png?Expires=1909540447&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=1r1EUzeEV356FYc2X6l09ET/REI%3D" />
答:————
16.[单选题] <img id="ODmujaoTEMP20200708115355123.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODmujaoTEMP20200708115355123.png?Expires=1909540435&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=aCsFLU0rRXSBvLKLkVWXYyMyDwQ%3D" />等于 ( )。
A.0
B.1
C..2
D.3
答:————
17.[单选题] 信号<img id="ODawmvuTEMP20200708115359184.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODawmvuTEMP20200708115359184.png?Expires=1909540439&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=oQSL5/Go7%2BO/is3cyA%2Bc4azRKac%3D" />最小周期等于( )。
A.<img id="ODklbnrTEMP20200708115359387.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODklbnrTEMP20200708115359387.png?Expires=1909540439&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=cRD179NuDnn3Q2L44uvRSUDVpBs%3D" />
B.<img id="ODowojtTEMP20200708115359651.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODowojtTEMP20200708115359651.png?Expires=1909540439&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=l7FTdKEWHuOXP2yGwHDjkGLJWKc%3D" />
C.13
D.<img id="ODkhvfyTEMP20200708115359817.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODkhvfyTEMP20200708115359817.png?Expires=1909540439&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=iO9NbMAafCV%2B7xqg6o3dXcyyeEs%3D" />
答:————
18.[单选题] 设某因果离散系统的系统函数为<img id="ODtnleqTEMP20200708115359002.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODtnleqTEMP20200708115359002.png?Expires=1909540439&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=4mqGX3%2BuPsZFmxOO5GfkA2HTs3g%3D" />，要使系统稳定，则a应满足( )。
A.|a|<1
B.|a|>1
C.|a|<1/2
D.|a|>1/2
答:————
19.[单选题] <img id="ODwizeyTEMP20200708115407976.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODwizeyTEMP20200708115407976.png?Expires=1909540448&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=pBpK6Uiz6lwXAiNI9us8FwvcTjI%3D" /> ()
A.<img id="ODgyjmfTEMP20200708115408106.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODgyjmfTEMP20200708115408106.png?Expires=1909540448&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=a%2B4tZ8MoaAZtHJWTXrgnEbPkBzM%3D" />
B.<img id="ODkzocpTEMP20200708115408290.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODkzocpTEMP20200708115408290.png?Expires=1909540448&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=nrMxkpzz3wklOlH8zzw7PlI0tso%3D" />
C.<img id="ODjyfepTEMP20200708115408505.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODjyfepTEMP20200708115408505.png?Expires=1909540448&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zd7Juhj3hap%2BStAFCNSj3KF7Hng%3D" />
D.<img id="ODyjbndTEMP20200708115408747.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODyjbndTEMP20200708115408747.png?Expires=1909540448&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=ISEZdLjwhGO8gNCFVUbCtb5eizc%3D" />
答:————
20.[单选题] 在工程上，从抽样信号恢复原始信号时需要通过的滤波器是()
A.高通滤波器
B.低通滤波器
C.带通滤波器
D.带阻滤波器
答:————
21.[多选题] <img id="ODukyjzTEMP20200708115431478.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODukyjzTEMP20200708115431478.png?Expires=1909540471&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=9aIfI0RHhs9Agp4ZzlfSpmCWmnA%3D" />，其逆变换x可能为( )
A.<img id="ODsktidTEMP20200708115431707.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODsktidTEMP20200708115431707.png?Expires=1909540471&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=GhcLqg/YmhSLcso/GvObrUtZHWI%3D" /> <img id="ODbfudiTEMP20200708115431974.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODbfudiTEMP20200708115431974.png?Expires=1909540472&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=J8UwmOZZe1MbbUr3mHPIS//nRw4%3D" />
B.<img id="ODyemyoTEMP20200708115432200.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODyemyoTEMP20200708115432200.png?Expires=1909540472&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=FTFAbQCRPXkyMP4UssBKi2JOR1k%3D" /> <img id="ODuzvveTEMP20200708115432308.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODuzvveTEMP20200708115432308.png?Expires=1909540472&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=rGkqn46jw8vCusxJMDrsx/k8/5Y%3D" />
C.<img id="ODfmsqwTEMP20200708115432558.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODfmsqwTEMP20200708115432558.png?Expires=1909540472&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=r7wO2JxHtjX9Sc4PzFBktRreP30%3D" /> <img id="ODvvhyoTEMP20200708115432763.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODvvhyoTEMP20200708115432763.png?Expires=1909540472&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=uojOVjra5myQhIrUOraQlqecy18%3D" />
D.<img id="ODjrtjdTEMP20200708115432951.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODjrtjdTEMP20200708115432951.png?Expires=1909540473&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=bTo0uvnVcHcJa3WkdWHhuIcjPmg%3D" /> <img id="ODifgbaTEMP20200708115433212.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODifgbaTEMP20200708115433212.png?Expires=1909540473&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=UP8poq5IToEYoLwNAF%2B1HBEdLtY%3D" />
答:————
22.[多选题] 已知一连续系统在输入f(t)的作用下的零状态响应为<img id="ODdqfllTEMP20200708115437929.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODdqfllTEMP20200708115437929.png?Expires=1909540478&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=dO1Y/kwwg7Ri1e%2B5z/wXWyNOnBk%3D" />，则该系统为（ ）。
A.时不变系统
B.时变系统
C.线性系统
D.非线性系统
答:————
23.[多选题] 若f(t)为实信号，下列说法中正确的是()
A..该信号的幅度谱为偶对称
B.该信号的相位谱为奇对称
C.该信号的频谱为实偶信号
D.信号的频谱的实部为偶函数，虚部为奇函数
答:————
24.[多选题] 线性系统响应满足以下规律（ ）。
A.若起始状态为零，则零输入响应为零
B.若起始状态为零，则零状态响应为零
C.若系统的零状态响应为零，则强迫响应也为零
D.若激励信号为零，零输入响应就是自由响应
答:————
25.[多选题] 下列表述中正确的是（ ）。
A.周期信号的频谱可以用傅里叶级数表示，它是离散的、非周期的和收敛的
B.若周期信号f(t)是奇谐函数，则其傅氏级数中不会含有直流分量
C.单边信号x(t)=x(t)u(t)的傅里叶变换，即希尔伯特变换
D.信号x(t)的傅里叶变换即为其能量谱
答:————
26.[多选题] 已知LTI系统的系统函数<img id="ODefytwTEMP20200708115436406.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODefytwTEMP20200708115436406.png?Expires=1909540476&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=VXFsiVu%2Bp2D1HqgIo5kisBRQxwg%3D" />，<img id="ODgvubfTEMP20200708115436508.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODgvubfTEMP20200708115436508.png?Expires=1909540476&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=ZW8bhuRAcqfVzt6D7fBOsErfPLA%3D" />，则该系统是（ ）。
A.因果系统
B.非因果系统
C.稳定系统
D.不稳定系统
答:————
27.[多选题] 下列说法正确的是是( )。
A.对于有限长的序列，其双边z变换在整个平面；
B.对因果序列，其z变换的收敛域为某个圆外区域；
C.对反因果序列，其z变换的收敛域为某个圆外区域；
D.对双边序列，其z变换的收敛域为环状区域。
答:————
28.[多选题] 下列说法不正确的是( )。
A.信号f(t)反折，则其相应的频谱F(jw)不变。
B.信号f(t)在时间轴上扩展2倍，则其相应的频谱在w轴上缩小2倍
C.信号f(t)在时间轴上平移2，则其相应的频谱在w轴上也平移2
D.信号f(t)为时限信号，则其相应的频谱也是频带有限的
答:————
29.[多选题] 下列叙述正确的是（ ）。
A.各种数字信号都是离散信号
B.各种离散信号都是数字信号
C.数字信号的幅度取值是离散的
D.将模拟信号抽样直接可得数字信号
答:————
30.[多选题] 线性系统响应满足以下规律（ ）。
A.若起始状态为零，则零输入响应为零
B.若起始状态为零，则零状态响应为零
C.若激励信号为零，零输入响应就是自由响应
D.若系统的零状态响应为零，则强迫响应也为零
答:————
31.[判断题] 两个连续线性时不变系统相互串联仍然是线性时不变系统( )
A.对
B.错
答:————
32.[判断题] 所有非周期信号都是能量信号。( )
A.对
B.错
答:————
33.[判断题] 按照时间函数取值的连续性和离散性可以把信号划分为连续时间信号与离散时间信号两大类。( )
A.对
B.错
答:————
34.[判断题] 若信号<img id="ODlkjcvTEMP20200708115439446.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODlkjcvTEMP20200708115439446.png?Expires=1909540479&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=6YRabtIdtBh2sR%2BI8/nGs6Khwm8%3D" />由数个右边信号组成，则其拉普拉斯变换收敛域只能在最右边极点的右半平面。( )
A.对
B.错
答:————
35.[判断题] 周期性的连续信号，其频谱是离散、周期的。( )
A.对
B.错
答:————
36.[判断题] 对于无失真传输系统的系统函数，其幅频特性是常数。( )
A.对
B.错
答:————
37.[判断题] 若y=x<sub>1</sub><img id="ODgywbwTEMP20200708115438084.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODgywbwTEMP20200708115438084.png?Expires=1909540478&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=70WqpTiTrZS4CB5GshrKCi5LQYo%3D" />x<sub>2</sub>,则y=2x<sub>1</sub><img id="ODwvmztTEMP20200708115438241.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODwvmztTEMP20200708115438241.png?Expires=1909540478&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=u1zzvQtJEEasDotJGze5cCJwPi0%3D" />x<sub>2</sub>。(注：<img id="ODqtiqgTEMP20200708115438387.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODqtiqgTEMP20200708115438387.png?Expires=1909540478&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=M3TQehyMtDth90IP42mJvIg36oI%3D" />运算为卷积运算)( )
A.对
B.错
答:————
38.[判断题] 收敛域内可能包含极点或零点。( )
A.对
B.错
答:————
39.[判断题] 满足抽样定理条件下，抽样信号<img id="ODskqyvTEMP20200708115439135.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODskqyvTEMP20200708115439135.png?Expires=1909540479&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zPRb7rDn%2BtI0u4yQozbDxFTnvF0%3D" />的频谱<img id="ODugiftTEMP20200708115439294.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0708/ODugiftTEMP20200708115439294.png?Expires=1909540479&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Rw0J6Qvtn5hTtl9xvoe72GlBXlg%3D" />是周期、连续的。( )
A.对
B.错
答:————
40.[判断题] 系统的冲激响应不完全取决于系统本身( )
A.对
B.错
答:————
页:
[1]