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【百年教育职业培训中心】-信号与系统-章节资料考试资料-北京交通大学

来源：百年教育职业培训中心　更新时间：2022-05-26 21:12:15

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报名本机构合作学校，赠送复习资料，复习课程，确保录取。并且可以申请学校奖学金500元～1500元不等！

答案：微信搜索【渝粤教育】公众号

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答案：微信搜索【渝粤教育】公众号

第一章单元作业

第一章自测题

1、【单选题】下图所示的4个确定性信号，哪个信号是连续时间能量信号( )。

A、<img src="http://edu-image.nosdn.127.net/01F474C3C3D502AADFCB8A1D7A295B1A.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/375B1AFEE7584FF1AD1F0DB2EC9AF244.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/9F0DD85E917EE1EA617C5534671E041B.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/D63EF8649D8D3F97FC9648C3537ED21A.PNG?imageView&thumbnail=890x0&quality=100" />

2、【单选题】连续时间周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_251f2aca-4fe6-49a3-808f-8b44efb7ed81.png" />的周期<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bf4eda2d-13bb-4e85-897e-0d69caf8b33e.png" />和平均功率<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_67893fd2-4b0c-4465-b372-c5216eb7a66a.png" />分别为( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ca5e4883-1217-4c71-b400-f7813598c135.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_074b5fe3-1991-4b71-baa5-9eda88e191d0.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_90af623f-9842-4e47-a384-10448d3bd027.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3efffc97-06da-44a9-954e-413d16329567.png" />

3、【单选题】已知下面4个元件的参数及伏安关系，其中不具有非时变特性是( )

A、<img src="http://edu-image.nosdn.127.net/83B8ABE7591A14D9CB203378D6DFF9DB.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/B3EF64A2968C198B6ED5AB511F65BE5F.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/F056D3D24B500CE20A1CA8B21E6109A9.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/D56FCC71CAF1528C3F68D16F2CD9D2B0.png?imageView&thumbnail=890x0&quality=100" />

4、【单选题】已知描述离散时间系统的输入输出关系如下，其中<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_eb12dcef-89c6-4a5a-9540-cd37122fb6b1.png" />为输入信号、 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9f0de1c1-5284-4cf8-8e00-f4148e3bc3c0.png" />为输出信号，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_928d3313-7059-42ab-91f1-56da229536e5.png" />为系统的初始状态，这些系统中( )不是线性系统。

A、 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c774dc2d-47fc-4832-b26f-98272a1a8aa9.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7fb42173-28d3-4b30-bf18-438a7f2a3231.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6101c5e7-8913-4176-ada1-ed9f94802ad0.png" />

D、<img style="color: rgb(102, 102, 102); font-family: Arial,Helvetica,sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;" src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_31ac386b-9d4a-4490-94ec-0bdb968f8b2d.png" />

5、【单选题】已知描述连续时间系统的输入输出关系如下，其中<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_20075259-21fd-4837-98b7-8307134dd405.png" />分别为连续时间系统的输入和输出，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_12632b23-dc99-42c6-9ce5-aec868f5e301.png" />为系统的初始状态，这些系统中( )为线性系统。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1eed97e2-4850-4f20-a434-72484dfe223c.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c49158e2-3646-4e15-a411-1127e9118643.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1ef8a8c5-fd14-4fe1-8e8e-0a5f0bdcd544.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3dfd45a1-e1b7-4d9e-813e-dc7432b6066b.png" />

6、【单选题】若<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a4d1d84a-a899-4036-a87e-2c1e3898d999.png" />为系统的输入信号，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3dbf9b48-e9cc-4930-bc87-cdbafb8b5680.png" />为系统的零状态响应，则下列系统中( )是非时变系统。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_96f7bd2f-7315-4bcd-9628-f1d1e78ca8e5.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1116254c-10f4-4b3a-86a7-72efdba69247.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_454c11b2-dec8-4519-8cb6-fa7525bb303d.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_85ec11a4-4353-4851-87a8-defbb6f91474.png" />

7、【单选题】若描述离散时间系统的差分方程为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3e37c031-1a57-4c03-b115-dce04affb2cd.png" />，该系统为( )。

A、因果、线性时不变系统

B、因果、线性时变系统

C、非因果、线性时不变系统

D、非因果、非线性时不变系统

8、【单选题】已知某线性连续时间系统，其在初始状态为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_12632b23-dc99-42c6-9ce5-aec868f5e301.png" />、输入激励为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2d80dea5-bf91-48b9-a118-cb7cdf068fd3.png" />作用下产生的完全响应为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cff90fc0-d857-4fe4-a996-41c97fecb737.png" /><img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fa2731d6-b970-45db-9575-97b547189ca5.png" />；该系统在初始状态为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fb43f0f0-d3c4-4d7b-aa52-00ad5e715cb8.png" />、输入激励为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2d80dea5-bf91-48b9-a118-cb7cdf068fd3.png" />作用下产生的完全响应为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b020e64d-cf8c-41b1-9ea0-a53126961c60.png" /><img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6367b3ea-7707-452b-9ff3-ef0e52f7a196.png" />试求初始状态为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_12632b23-dc99-42c6-9ce5-aec868f5e301.png" />，激励为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9c9ea0eb-3c82-4a25-9bba-6e3fadaa090b.png" /> 时系统的完全响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_eb779497-2259-41a9-9898-c5aa4ab40823.png" />=( ）。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_960fa000-bed0-416d-9b67-59e09998bb39.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5ebe9cf7-89d1-48f8-a06e-ec6be7cfdc18.png" />, <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a50f3890-0d40-4292-bc9a-1a6491b20fea.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_44ef3fde-f0f2-4b97-8315-42e99941d559.png" />, <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4fff33e1-c7e9-4d3c-8c38-010b8272ee41.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c09c2205-a587-4a55-a1d6-a907e0523f66.png" />, <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0413bc39-0a4d-4a8b-8a26-f6b86c325f63.png" />

第二章单元作业

第二章自测题

1、【单选题】正弦信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_919a657e-eac5-4a77-9948-6043967b3b74.png" />可用相同周期的虚指数信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b218f24c-92a1-43f7-b573-02cec8a26f5c.png" />表示为( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_384bccdb-6792-4303-b937-70772d6233ee.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_babc4997-7659-4860-815b-5ac4066b5a86.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_41ebc771-2579-44ad-bb14-e0bca98f3197.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d4bce354-07c9-470f-837d-2d4204baf19e.png" />

2、【单选题】下列关于虚指数信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_42192789-ec27-4b3b-b7fe-2f1972a5bc1c.png" />的描述，错误的表述为( )

A、虚指数信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_42192789-ec27-4b3b-b7fe-2f1972a5bc1c.png" />和正弦信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6601675f-e58e-42e6-a40a-12fe414a8006.png" />都是基本周期为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_626b1e07-c02b-41f9-b0e9-785b36ed917a.png" />的周期信号。

B、虚指数信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_42192789-ec27-4b3b-b7fe-2f1972a5bc1c.png" />可以表示为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f23ecb7f-c323-45d9-970c-6eb2757e91f5.png" />

C、虚指数信号和正弦信号可以相互线性表示，因而他们具有相同的特性。

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b83fd809-3f6c-4338-9b96-982624c05789.png" />越大，虚指数信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_42192789-ec27-4b3b-b7fe-2f1972a5bc1c.png" />的实部和虚部的振荡频率就越高。

3、【单选题】已知信号 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f8860fd2-b3f0-4b95-9791-3412b5ec7d45.png" />的波形如图所示，可以表示为 ( )<img src="http://edu-image.nosdn.127.net/8C5B9EA0D0B60394D28E3E7BF82D4FAB.png?imageView&thumbnail=890x0&quality=100" />

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_02df8750-68be-41a9-aef4-04786cd0bd00.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7e03eb30-4e2e-4430-9d18-d8c90d976531.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_979eb446-43b0-42b0-b449-61b1eaeaacb1.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d7560eea-bc1b-462f-8120-87e752c3b922.png" />

4、【单选题】信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8abfe953-ffbb-4a8c-ac7e-8f078c326205.png" /> = ( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_15fec47b-74a2-45c7-952c-36cf3901fac2.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_02ecc204-20b2-4c9d-9715-763c1b2882c0.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_83f6dad2-f51a-4ebd-9bf3-f2c05c52925e.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_531b5356-0a2b-4d2d-88f8-6593575b1d6f.png" />

5、【单选题】积分<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_23603994-0418-4832-a4a6-726d71ee5e33.png" />的值为( )

A、0

B、4

C、-4

D、2

6、【单选题】下面关系式中，错误的是( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7ecdeeca-eb8a-4aaa-9743-82c49fc80279.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_685bd3c1-bdb6-465f-91a2-8e04fa08a910.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_39781db5-3716-4096-b034-defbbec5953b.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_21b07529-350e-47a1-8330-a21f337504cc.png" />

7、【单选题】下列关于虚指数序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_47bcf8ba-2d63-487b-b388-ae11eaa074c4.png" />的描述，错误的是( )

A、虚指数序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_47bcf8ba-2d63-487b-b388-ae11eaa074c4.png" />不一定具有周期性。

B、虚指数序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_47bcf8ba-2d63-487b-b388-ae11eaa074c4.png" />正弦序列可以通过Euler公式相互表示。

C、虚指数序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_47bcf8ba-2d63-487b-b388-ae11eaa074c4.png" />是由连续周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_80ed22e6-24e0-42e2-b702-bed74260ac42.png" />抽样所得，两者的周期一定相等。

D、虚指数序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_47bcf8ba-2d63-487b-b388-ae11eaa074c4.png" />幅度的变化不一定随角频率<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b83fd809-3f6c-4338-9b96-982624c05789.png" />的增加而增加。

8、【单选题】下列关系式中，错误的是( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3d37070a-ac21-4c43-a033-b8870365dc3f.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_da2a15a7-7fc7-40ac-b158-954d8edfe6dd.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ae82ce71-a9f4-4bb4-b80e-5b47344d7a38.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9bce06de-2e42-48a0-9142-d43c996b5a81.png" />

9、【单选题】已知信号 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_740cc213-1515-413a-b3b6-f4d12819d8fc.png" />的波形如图所示，可以用<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1f295d14-3644-4e52-8aa8-7cdba466b6e3.png" />和<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f8bd6e06-caf4-4ded-a8d6-d567791eafa6.png" />表示为( )<img src="http://edu-image.nosdn.127.net/CA204F8B0E7BA2F53040F556743FA377.png?imageView

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c2cb0a5c-79f0-41c5-9ad6-ec71742ebb65.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1da407e4-8902-4a85-86d8-2afd0c34775b.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a5739c3a-95fc-4454-873e-334887c4de19.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9e8c3335-a456-4b7b-a83d-92efa1f41f00.png" />

10、【单选题】已知信号 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2d80dea5-bf91-48b9-a118-cb7cdf068fd3.png" /> 的波形如图所示，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e2afccee-8e2a-48ef-b73e-1679c7866f4a.png" />的波形表示正确的是 ( )<img src="http://edu-image.nosdn.127.net/C6553EFBFC7858D0279825C2C709EB6D.png?imageView

A、<img src="http://edu-image.nosdn.127.net/7777236E45FAC15AFBABC57527D91B4B.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/3DF3EEF33B1FA123209DE3B1750D8D97.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/06E6FAE3C460FE2EB877ACD3596BE97B.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/BA5D077AD507A399E2AC20D16FC3C243.png?imageView&thumbnail=890x0&quality=100" />

11、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2d80dea5-bf91-48b9-a118-cb7cdf068fd3.png" />的波形如图所示，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6078e87e-7b0c-41d9-91b8-f8da94575636.png" />的波形为( )<img src="http://edu-image.nosdn.127.net/B1858A1AFE17BBC446B0E6184FB5A404.png?imageView

A、<img src="http://edu-image.nosdn.127.net/7989BCE47C224BF944E93B5DAD982B32.png?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/44279482ECFFD8C58E81451A3732CD2A.png?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/9E7835B98EF2FBA8C7680E93A3A104D6.png?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/93C6156CE8EB6F9E3ED4FD5C077FE936.png?imageView&thumbnail=890x0&quality=100" />

12、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7be0d1fa-95bd-4801-8f81-af5c326a5bce.png" />,信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_02de3ce0-981f-4e69-849c-4ae5f4da8967.png" />=( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b5027c15-a7d7-4ca8-983e-7ce5cb6dd043.png" />

B、 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_294e53a2-36ee-4baf-99e5-91dff0e09686.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4e70d201-8b87-41b6-a7b8-f2b68f3119b7.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_040dc2ee-8326-4fdf-a714-20db2b5d0b61.png" />

13、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_eb12dcef-89c6-4a5a-9540-cd37122fb6b1.png" />的波形如图所示，下列表达式中错误的是( )<img src="http://edu-image.nosdn.127.net/E1F896A5F61CD5F4D7041A6869E74EC2.png?imageView

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_de245770-1a74-4c64-829f-49d9d4d769e9.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d4e77df1-8259-4f71-a1dd-a713137ed4d1.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_403302f9-5283-4ca6-a7b3-6b2af17d2702.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5c1fc453-50e0-4150-b9d3-259d1a500343.png" />

14、【单选题】若离散序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_29b477a4-2c17-4918-a1f0-31e63b08dc08.png" />，则下面4个表达式中，哪个不是<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_eb12dcef-89c6-4a5a-9540-cd37122fb6b1.png" />的偶分量（）

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_95c4fc97-f924-447a-a8a6-853e9bf20eb6.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a8057251-0068-43c6-af78-776117468a76.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f472692e-181b-4735-bf0f-00c1ef6d3452.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_36254bb1-a19a-40e6-8b25-e90a79435f20.png" />

第三章单元作业

第三章自测题

1、【单选题】若某连续时间LTI系统在单位阶跃信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e1975289-cd5d-4132-822d-849b1a24863a.png" />激励下产生的零状态响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7427f198-fa88-49ba-8ac7-a83a735895c4.png" />，则该系统的冲激响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ce190765-85d5-4063-b6cb-dc6234c317af.png" />=( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_837f44ab-d982-4d6d-9f7c-6c0266b5b8f7.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_13a792d3-f518-4355-95b8-f54b7bd33ff0.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_48a97446-93f4-4e89-8a3c-401a67d774e8.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_577b87ad-234a-4b61-9420-b9796ff1261a.png" />

2、【单选题】若某离散时间LTI系统的单位脉冲响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ddc82a7a-1c11-41de-98a4-2722333df797.png" />，则该系统的单位阶跃响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_56279ab4-0815-4c35-be04-1b8f2696fe65.png" />为( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_aa1c272e-413a-42f1-829f-8f2dcd9ec511.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_016f7c24-45a3-4176-9395-01ec8a3599e9.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3dfc2ef7-2e86-4067-8944-01540728a015.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_83c0459a-80d9-475b-8d4f-8980e7891fe3.png" />

3、【单选题】某连续时间LTI系统的初始状态不为零，设输入激励为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bdcd70bc-e6de-4e15-98ce-18e23ab5d820.png" />，系统的完全为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0bde102a-7abf-445e-ab84-1622354d165b.png" />，则当激励信号增大为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cc31d535-ad56-4a04-aa84-83dfc13e5d0c.png" />时，其完全响应( )

A、也增大为<img style="color: rgb(102, 102, 102); font-family: 宋体; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;" src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e1569a78-79ff-4433-bb79-b813ad90bb8b.png" />

B、也增大但比<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e1569a78-79ff-4433-bb79-b813ad90bb8b.png" />小

C、保持不变仍为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0bde102a-7abf-445e-ab84-1622354d165b.png" />

D、发生变化，但以上答案均不正确。

4、【单选题】若描述某二阶连续时间LTI系统的微分方程为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9b22d2fd-8654-401b-a2db-4352ceb7d0fc.png" />初始状态<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_151e2641-74da-433b-9919-cfc191687cd6.png" />，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7e17f7fd-167e-4f02-932c-c1f47577c341.png" />，则零输入响应是 ( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b0aa3506-4a7f-44f8-83ea-b34c3f9f17d8.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6eb64dab-968f-49ed-b357-94957edaa53f.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_de02d228-0bba-4111-bb89-90c5dde9d1b3.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fe26fca4-274d-4abd-b880-2752c007ac4c.png" />

5、【单选题】若描述某二阶连续时间LTI系统的微分方程为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ebe2b7a9-e180-491e-9b99-1d71f3c169b8.png" />则该系统单冲激响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_db53d82c-3002-4d64-96ae-e25f3be01f03.png" />的形式为（）

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_364a58d4-eb83-4b6f-86b4-8739ec3fb55c.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7bf76c55-7403-4eed-a13b-376a5161fa36.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_771aacb3-ac52-4f45-8568-d37265273bc7.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5fe95992-a527-4b92-a6db-4e029ffff1b3.png" />

6、【单选题】若<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f84deb5e-1a92-461c-a0ce-75a8842af2ad.png" />，则<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3c2c90a1-5649-4f7d-acda-84af6ff5058b.png" />等于( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_92b0cae1-ceb4-4463-b633-a0d11f50f6b1.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a6c6647d-95b0-4134-821b-c430f1b164a8.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1b955c29-a79c-43c5-98c0-c80c2a270bc7.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0d647596-3cb7-4ce2-b7e2-7b2d95435e0a.png" />

7、【单选题】<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_74a76625-cd6b-4f87-a1af-7ac01d545b10.png" />不等于下面四个表达式中的哪一个？( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2f63b0b8-aab9-4f0d-9239-4a9d052443ba.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a6fa5029-c65f-4974-a8c4-c7cd8642895d.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_793b0fc0-a079-4c8c-b3cc-db425eae8042.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_09d01f3b-f7e8-4782-a027-10fa2c609726.png" />

8、【单选题】若某连续时间LTI系统，其输入信号信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bdcd70bc-e6de-4e15-98ce-18e23ab5d820.png" />和冲激响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9872b52b-d46c-4c5b-965b-c659786fe5d2.png" />的波形如下图所示，则该系统零状态响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fe76aaaf-aace-4187-82ce-5cf557c5780c.png" />在<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c537ee0b-2c11-4f27-97df-63881911a5c1.png" />的值为等于 ( )。<img src="http://edu-image.nosdn.127.net/0BA4C4E8D38AB2865136B37E94220C45.png?imageView&thumbnail=890x0&quality=100" />

A、-2

B、-1

C、0

D、1

9、【单选题】某连续时间LTI系统的冲激响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_05dca6fa-f1c2-401c-817d-2ff376f9d305.png" />，若激励信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4aa824f4-c1ed-4336-887b-d6282369246a.png" />，则该系统的零状态响应是 ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_77fe210c-d5c7-4b91-9537-82acff8c13ea.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_97a57a0e-876b-4f11-b374-19d1997332bc.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b9bb1a0b-2d6a-4844-ab3f-7dcf05df023c.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_319ffdb0-c7a9-473f-b83f-6bb03c81f59a.png" />

10、【单选题】已知描述某连续时间LTI系统的微分方程为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_61c75547-94b3-4422-a8dc-94361845267a.png" />，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fdfdbccb-b376-410c-b9b6-2127fda02618.png" />；若系统的初始状态不为零，激励信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_93f4a748-9c43-4a53-a03f-a0de73475292.png" />，完全响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e4eee117-c2ca-4c23-b922-173720f28799.png" />则该系统的固有响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_dfb05f03-d4a0-44a3-8875-fdf818dcbd44.png" />为 ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_379c3808-fe2e-47bd-a1b1-35c0d1a4dabd.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d4a1d306-99e8-4971-90e3-397f7248eee0.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a2cf25dc-8026-4582-970e-e667cfc11006.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_50a8cb52-8b09-4a82-9442-b9b82839c794.png" />

11、【单选题】若某离散时间LTI系统的差分方程为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e6ac0b9d-36f6-427b-8177-62457d0eb288.png" />初始状态<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0dd0c948-3fe0-464a-893d-b2fad73d4dad.png" />则该系统的零输入响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_450836a5-973c-42fb-bcfb-901fa03704f8.png" />为 ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6e33d153-9e58-44b3-be19-0b534411612d.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_47ef4903-d23a-4ea2-b647-35343ceefc90.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8243b344-36b1-454d-9db6-bfef324aa776.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_55ff7e64-5976-4046-9384-4eb40da8d17e.png" />

12、【单选题】描述某离散时间LTI系统的差分方程为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9af373fe-6aa1-4cee-9354-040a1f1e15ee.png" />则该系统的单位脉冲响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fc1db398-e48b-494a-924d-e0b7720280ad.png" />为 ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fb1c2fdd-0dcb-4b33-b88a-65ad0774a5a0.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2c9db603-0882-462d-a86e-72ba676e151f.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_66ec2304-b43b-402d-b5f2-1f88cb66280f.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_496d75cb-5949-477f-a944-a98313d67954.png" />

13、【单选题】若某离散时间LTI系统，其输入<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0a00dca8-2a37-4a2c-9963-32edfcf24344.png" />，单位脉冲响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cf6c3da7-ddb9-40d8-b18e-95836d97a00e.png" /> <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6262da80-c411-4b86-a91e-b06abc7e62f1.png" /> ，则该系统的零状态响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7315a353-bd21-43d5-9c9d-2925aa585b31.png" /> ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5b690311-4ec0-4869-82d1-e0557d6d5898.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_42fa9ec2-422a-4899-9559-acdb7bc1cb20.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f4ab0855-be5b-473f-8190-26ec70295fd2.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f9b663b5-5ba4-4ce4-b800-99cea0897b80.png" />

14、【单选题】已知描述某离散时间LTI系统的差分方程为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_987f4ea4-3df4-4752-a203-826c601ef1ff.png" />，若系统的初始状态不为零，激励信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_80f5794a-cc3a-4d6e-8ec8-edcabffdccf8.png" />，完全响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9c6f2cb9-75be-411a-9911-3bc6585c237b.png" />，则该系统的瞬态响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f76c0b9f-f56d-4591-b959-370d0b47388a.png" />为 ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e50158ff-b7b3-466d-8edf-367c502ddc3a.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6aceec48-022c-4342-a616-c9d7212558c9.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_acd8b4e3-3a95-4807-b56a-6379e0a8e65b.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_40f7cf15-50f4-41af-be4f-7a8600e1260c.png" />

15、【单选题】冲激响应分别为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1906788a-802f-4e36-8f9e-b5df7dcdbf19.png" />和<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5ea4bee5-d82f-482b-a696-29c4d80f21b5.png" />的两个连续LTI系统相并联，其冲激响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_db53d82c-3002-4d64-96ae-e25f3be01f03.png" />为 ( )。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0d44d5de-d4e8-4b65-8fb2-3a7037d9e3da.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f52ee911-3f7f-4288-9741-44f8e273fb60.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cefe1fbf-6126-4bd4-9f60-bb7af8193f0d.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2273aec9-61e6-4e33-bf09-9bddc880c3f8.png" />

16、【单选题】下图所示离散时间LTI系统的单位脉冲响应h[k]= ( )。<img style="width: 1px; height: 1px;" src="http://edu-image.nosdn.127.net/F5422A62FCFBB5819A7FD7CDCE339667.png?imageView height: 181px;" src="http://edu-image.nosdn.127.net/F5BD676CF724963969EE947C12D91B90.png?imageView

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0aabadac-adad-4696-a971-1f21282758ea.png" />

B、<img style="color: rgb(102, 102, 102); font-family: Arial,Helvetica,sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;" src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1e4588f3-f826-4402-a139-36d5659b7450.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8074541a-ac47-4cce-9cee-89c6b3ff9248.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1ebff01c-78ab-49b3-b2b8-6c746f25af37.png" />

17、【单选题】已知N=5点滑动平均系统的单位脉冲响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2562f86c-944d-4993-a868-6cb4e22f4c29.png" />，则系统( )。

A、非因果、稳定

B、因果、不稳定

C、非因果、不稳定

D、因果、稳定

18、【单选题】若某离散时间LTI系统的单位脉冲响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5268ec41-682e-4072-bbb6-37c6274510ee.png" />，输入序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_37021ee7-001b-4bf9-9b00-cc7df9cf983e.png" />，则系统的零状态响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_dc617427-bc94-48fc-b9a7-11896f0fb542.png" />在<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cbe98f7e-ef2c-4db6-927e-23cb4f99b1ab.png" />的值为 ( )。

A、2

B、3

C、4

D、5

第四章单元作业

第四章自测题

1、【单选题】某连续周期信号如图所示，该信号的频谱成分有<img src="http://edu-image.nosdn.127.net/AA050FFB083C2B4B271B025C7C626D23.PNG?imageView&thumbnail=890x0&quality=100" />

A、各次谐波的余弦分量

B、各次谐波的正弦分量

C、奇次谐波的正弦分量

D、奇次谐波的余弦分量

2、【单选题】已知连续周期信号的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_42dc701c-948b-49e4-a2d9-877eb6f1f6bb.png" />如下图所示，其对应的周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1d18c8b9-6a8f-491d-a46c-78414c6facd9.png" /><img src="http://edu-image.nosdn.127.net/0BE2435F017DEE1D5F69F9A301442A23.PNG?imageView

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c18de5a4-10ff-4006-b980-4dfe188987e6.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fbcffce5-a793-4afa-8e37-ef8a9a56aa0b.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8c5ab444-c5d6-42ce-aa23-a72d4d02ecd5.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_31b39ccf-acdc-472b-9dce-59473dcd311d.png" />

3、【单选题】如图所示周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_325fba29-5b0b-4375-ad6e-355016279fe9.png" />，其直流分量等于<img src="http://edu-image.nosdn.127.net/B6C6F6CD2C853F7E39996844BC97DD70.PNG?imageView&thumbnail=890x0&quality=100" />

A、0

B、2

C、2.5

D、4

4、【单选题】连续时间周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_433690e1-7e9c-4584-bb76-920dabf0d816.png" />的平均功率为

A、6

B、6.5

C、8

D、8.5

5、【单选题】连续非周期信号频谱的特点是

A、连续、非周期

B、连续、周期

C、离散、非周期

D、离散、周期

6、【单选题】信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_22ab7d8e-3b65-4717-acf7-646172876b40.png" />的傅里叶变换等于

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_49c05acb-82c1-445f-b2a3-644d79d1fe29.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1ce1cc49-aaf8-435a-855c-5d3449176a26.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f36a3396-e377-4625-85ac-f607a4522423.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_147b7051-c9a5-4edb-9b26-a6700c761f6f.png" />

7、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_60d1aee7-b91b-4b6c-b03b-e3213163b664.png" />，其频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fb2f7baf-aca3-400b-88b2-56b06bb2c204.png" />在<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_78577769-d412-4eb3-bca9-ca569e637f61.png" />的值<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6d6dc552-0831-434f-b6ca-ac66d106c0e2.png" />

A、0

B、4

C、8

D、16

8、【单选题】若带限信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_aed72245-3681-4694-83b0-d0366268f10b.png" />的带宽为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_10374300-765a-4f0d-88f7-8a7394aae212.png" />，则信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0608c8c1-c8bc-4d69-844c-11444c2aebe9.png" />的带宽为

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e0ef6f7a-ea13-453d-a5ce-a8e34783932f.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a50c3554-0ec1-4cae-a33d-b5fdde7aecbc.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d52d412f-6bec-48f5-b351-fbda6a0b629a.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6c17f77c-2ddb-4daa-8cc1-683b1cbebbab.png" />

9、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7c879e40-c4fa-48bc-baf4-bbc8cb3a0a1e.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0f3d3a07-d0a4-4a89-bfc9-7b693c11dbc2.png" />的最高角频率为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_377598d7-2973-4713-b0ba-bd31db002ea4.png" />,<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_af51250f-336c-4e7f-954f-62bcd5e81d62.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3a0f4c9b-8499-4efc-a34f-9cbb3a426184.png" />的最高角频率为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_94030066-297f-4942-8fa2-ed0201bae65b.png" />,信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_af616527-619e-475f-9b46-ad2f327c0d74.png" />的最高角频率等于

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_eb70d057-4952-4c31-80e5-c5d58c2cd17c.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a4c6096c-f8ea-49b8-a32f-63b7b103ebd8.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f2e866d8-d943-4480-a4db-76f8ecfa1fd4.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fe70e8cd-879c-4a75-8553-ad74bdf21a2d.png" />

10、【单选题】如图所示信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9447546e-7f58-46a6-aca2-487422277124.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_db0b099c-d994-4e99-8cfb-1debfc43db71.png" />等于<img src="http://edu-image.nosdn.127.net/043F27BB5DC694E9A07EB5742DC94D5A.PNG?imageView

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6e63e48f-9399-4f13-bd0b-ba5f9efd047b.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_dc45059c-bd7f-4912-a9b8-1202803199e3.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3bb9b174-67f0-4669-b241-82dc89f7d3a0.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cc139ef5-3ca1-483a-8575-e35bd302296f.png" />

11、【单选题】已知实信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e0ceb8d3-893e-4fe7-b621-4daa9fead32b.png" />的最高频率为100Hz，则信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_356de122-f284-4ad4-8fb7-66076cdaa850.png" />的最高频率为

A、100Hz

B、150Hz

C、200Hz

D、400Hz

12、【单选题】信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8607f172-cb3e-4f40-a93f-8a2737c24265.png" />的能量W=

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a91c112e-ba8b-4a98-a0c0-e9a83f5f438d.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e29a3ab1-431c-4531-afed-78fc7719b0aa.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_adce277e-d3bd-4111-a4ec-186960f69a91.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f4407782-ed10-4ee6-aaae-d06f97d4e056.png" />

13、【单选题】设图（a)所示信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ce4f70ee-4f0c-4243-8873-096e2fa84f52.png" />的<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_af6e32d6-0ebd-44f0-bdee-fad99a8908b1.png" />变换<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6b571582-00a4-4c82-b42b-a5403c2e2a2d.png" />为已知，则图(b)所示信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a4ea3ae2-92b4-443f-b800-d9c1a8473c03.png" />的<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_be9256bf-2da9-48df-b813-aea01e2c13d7.png" />变换<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0c1f5d03-7e17-4394-9e76-fef2a0f0f4f2.png" />等于<img src="http://edu-image.nosdn.127.net/DA64675DDA57B8AF5399544669677B66.PNG?imageView&thumbnail=890x0&quality=100" />

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_37ef9030-f198-4a67-971f-2d75dba9352d.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_66542f56-9fd6-4876-9ee6-e05d0a3456fc.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d32a805e-17d6-413d-8ade-5d814aeb9f34.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2b09998b-d382-4858-b066-d29184a230b1.png" />

14、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_afd4d005-d4cd-4f13-9675-5d50a0a292a0.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2376816e-d2ad-4048-8295-597328fadd55.png" />，则信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_390a8b4a-924a-4dce-9eee-68f94bc95437.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_61515549-daa4-4c0c-aef0-3dc702cf5e8d.png" />

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_adf54850-ab51-4e78-9cc9-28eb09c4391d.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7650cb37-889e-42c8-b8cc-5969faa5c946.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f2d36abe-0557-45a8-a819-f41d4733a19b.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a7768c01-44de-467b-a37e-50cc337b1276.png" />

15、【单选题】已知连续实信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_236fe0fb-cb6c-459a-b4db-f4b12903493e.png" />的频谱为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_25689119-4743-452c-bd8d-d717bfb3efea.png" />,则信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_579f373f-96a5-4dc4-bb0c-c2ce273bb94e.png" />的频谱为

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d4333e98-cbcb-4aee-bfd2-8b0b76c1aa35.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8824d5d7-b28f-4022-bdfb-742621b5342b.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6d9468f0-16c0-41dc-9122-e1470aa09859.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c07f6cbd-8d5e-4c68-8a4e-e85dc23a2c81.png" />

16、【单选题】已知某语音信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_86fa4b16-ca49-40b3-9ec2-b37405d272be.png" />，对其进行运算得到信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_74d42195-8152-4bf7-88f9-4ed2dba3dd6e.png" />，与信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_62a657c9-8307-4650-825c-9feadeec4303.png" />相比，信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0c34e376-b7fe-4071-a8b0-27b1ebc56428.png" />将发生什么变化

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9c781e1d-acde-4a1b-9e7a-4515dd865618.png" />的长度会变长、音调会变高

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8e8544dd-476c-46c5-8b74-e9ea20d5b848.png" />的长度会变长、音调会变低

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9ba26003-9c2e-4eca-bf5c-842aca70ea5b.png" />的长度会变短、音调会变高

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4f995cd5-8477-4db5-8649-31ddd5cf18ad.png" />的长度会变短、音调会变低

17、【单选题】已知离散周期序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cfdae9e1-835c-4d05-9441-a893c8c02b42.png" />，其频谱为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_65a9ac0f-cf89-477c-a5f7-936de4759adf.png" />，若离散周期序列的频谱为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_38edb942-6785-46ff-982e-992a82d7c000.png" />，则<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f2c9c2da-4526-4e77-84ef-36b51fd76281.png" />在<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_eaecf170-bcae-4211-aefa-985ca50a2010.png" />的取值为

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c54be6a5-b323-4f2e-b364-0ca456ebf989.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b3577a25-e904-42f4-9754-d9201b98e7d5.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a60935eb-cf9e-40fe-9be8-8f8385f54a97.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1c8e75b9-8b72-4091-a997-cc8b8d25e195.png" />

18、【单选题】若离散序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0a798313-0fd7-4b70-94af-d4705b793e9c.png" />的频谱为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1daec793-09f6-4af6-be43-9ea60bebf518.png" />，则<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_cdd90907-36db-4b23-bf84-3739b6f08220.png" />的频谱为

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6b667c50-fd08-4de3-a4fc-05d20e80868c.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c0bb0b90-4318-4bfe-98d6-11f9ac207af1.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_918e2776-db38-410b-aced-42a51d6ca16b.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7a23b8bb-6886-4a33-b30e-4a9d7dbe3aad.png" />

19、【单选题】若有限长序列<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9cc2dabf-1c57-4c53-89fc-7f9ee4555713.png" />，则其频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_27732de5-8475-4a15-a1e6-0b6b672b8b3a.png" />在<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5ae1dcc2-ffc7-4399-bb07-237fc140d14c.png" />的值<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b2770e46-659d-4efb-b563-17fa855ad30b.png" />

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5c32507b-8a4a-4125-8370-76279ffa35fd.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_386443d4-7ffd-4096-bb8e-bd986b153fb0.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_21241703-f2d8-4cbd-838e-d91cf8480a73.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2ce90869-597f-4a12-9933-4f4c30d583fb.png" />

20、【单选题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_050ac4bf-9e13-4701-9bee-b877b26c6dca.png" />的频率范围在<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8e291337-240f-450c-88ec-4841d004ae65.png" />，若对信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_318b4954-ecfa-48db-a8b5-8fba288e1d8b.png" />进行抽样，则其频谱不混叠的最大抽样间隔<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_92bba670-bb33-4aea-8e76-4c62ee243ca4.png" />等于

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e182c86b-b56d-44d1-8b6e-3ada681dae12.png" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0c709f4e-9c35-4340-8264-6c37b1e04a75.png" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6492ce3c-c681-4b83-8e46-1a593c85adb8.png" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_693fa1ba-b394-4ff9-8350-84dbaf5620ea.png" />

21、【单选题】关于时域抽样定理，正确的说法是

A、抽样间隔越小越好

B、抽样频率必须大于等于信号最高频率的两倍

C、抽样后的信号不需要包含原来连续信号的全部信息

D、时域离散化，频域周期化

22、【单选题】连续信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ba7dcd7c-a125-4bb5-abc2-75812a525c72.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_38cd7114-03d3-4991-80d3-e510c1009c87.png" />如图所示，若以<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_101c3b03-73f8-44cd-a6c3-6590604d6368.png" />对信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9ebca624-81d6-408f-b5eb-fa3f1cd69db9.png" />进行等间隔抽样得到离散信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8bede399-ddee-4778-81ab-851eefff50fa.png" />，则离散信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b461cadd-f634-46c5-a509-6f24e28e806e.png" />的频谱<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_52b81ad4-03f6-482f-9c0d-e08aaafbe00b.png" />为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6b43fd3a-7e99-449e-ac0b-881e08fc00d9.png" />，<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6e5a4e05-bac0-4515-b4ee-54125ba59241.png" /><img src="http://edu-image.nosdn.127.net/508F3422682D69550805B0BF3E92D079.PNG?imageView

A、<img src="http://edu-image.nosdn.127.net/DFE318B4FC6C357C17BE761F2741B397.PNG?imageView&thumbnail=890x0&quality=100" />

B、<img src="http://edu-image.nosdn.127.net/597E548ED4DFB51409FB43E30B4C6820.PNG?imageView&thumbnail=890x0&quality=100" />

C、<img src="http://edu-image.nosdn.127.net/67C4D99B297157F4875DE76991A9EA34.PNG?imageView&thumbnail=890x0&quality=100" />

D、<img src="http://edu-image.nosdn.127.net/526B0DE28D3BFDEC3AEE7D6C48C86774.PNG?imageView&thumbnail=890x0&quality=100" />

23、【判断题】吉伯斯现象产生的原因是用有限项傅里叶级数表示周期信号。

A、正确

B、错误

24、【判断题】信号时域变化越快，其高频分量就越多。

A、正确

B、错误

25、【判断题】已知信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_99c12ae6-3b1e-4df1-aa65-fb5153240e50.png" />的最高频率分量为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5b10a504-8b86-4ec1-9f3f-56c6329a0dd9.png" /> Hz，若抽样频率<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ba551f25-f247-4a84-ba87-df695048f548.png" />，则抽样后信号的频谱一定混叠。

A、正确

B、错误

26、【判断题】信号时域时移，其对应的幅度频谱不变，相位频谱将发生相移。

A、正确

B、错误

27、【判断题】连续时间信号在时域展宽后，其对应的频谱中高频分量将增加。

A、正确

B、错误

28、【判断题】无论连续还是离散时间信号，周期信号的频谱均为离散谱，非周期信号的频谱均为连续谱。

A、正确

B、错误

29、【判断题】连续周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_efc9777d-7a77-469c-b67c-4e2039e45ea9.png" />是功率信号，其傅里叶变换<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_db092ad4-1b1d-4f83-a17f-ecdfdef8317c.png" />都不存在。

A、正确

B、错误

30、【判断题】连续周期信号在有效带宽内各谐波分量的平均功率之和占整个信号平均功率的很大一部分。

A、正确

B、错误

31、【判断题】若连续非周期信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_d42b0a47-9612-45be-b9b2-f98ee1b0f37e.png" />的频谱函数为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_71cf5152-845e-4a65-99d8-9231234ad78e.png" />，则两者具有一一对应关系。

A、正确

B、错误

32、【判断题】对于任意连续信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ccdc5637-25ac-4b5e-b722-4b3d74145071.png" />，其幅度频谱为偶对称，相位频谱为奇对称。

A、正确

B、错误

第五章单元作业

第五章自测题

1、【单选题】已知描述某因果稳定的连续时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_980ae4f1-7e3e-425d-9952-02d8ec0d8918.png" />系统的微分方程为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_77363ee8-672e-414f-aa98-7778f7f3ebde.png" />则系统的频率响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7da4ec99-e37e-4dc0-b69a-42583cee019e.png" />为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_956518ce-767d-491f-b43d-1c7df46890a4.png" />。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_54ed75a9-6ef6-44e2-8f62-e4c18528e77e.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7e22d683-6dfb-4409-bccb-4fca1b656046.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_86587949-fbe9-4744-bcc4-cc1e110f73ec.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_909400cd-ca1b-4947-9b01-e3639b07528d.png" style="white-space: normal;" />

2、【单选题】已知某连续时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_97ddbb28-a931-4a13-9755-da519015db45.png" />系统的单位冲激响应 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c3d35efd-fda3-4343-8e92-99fc23324f7b.png" />则该系统的频率响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_021410dc-95d9-401c-bade-f84bbb3cf0c8.png" />为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2cc836f4-0451-43a7-9ea4-68ab0ca7ca47.png" />

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c33e008e-9395-4b16-8371-27ac44e53fc9.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c596a2f8-bdee-42ec-a295-bd70ced12027.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e4555570-a48d-47ff-88da-41bc06476530.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6b309a1a-e132-4ddc-b463-7b03b5af41f8.png" style="white-space: normal;" />

3、【单选题】已知某连续时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5370d3c4-f7a9-44d8-9792-1a50ea601596.png" />系统的单位冲激响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_48c1c1c7-2dcb-4de0-a40a-d8eea25c658d.png" style="white-space: normal;" />，系统的频率响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8dfa7867-4cb4-4f4b-b0cb-c71a4feca664.png" style="white-space: normal;" />( )

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_f5d2643d-6db6-4ff6-96b8-8d2d1882aad5.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1b56ebf0-8f35-40a0-939c-ffee5c7a6d67.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_029ae580-f501-446a-a63b-0e061f73c6c5.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_7d27afed-0c5a-46af-aa64-5cfc6ea3cd3e.png" style="white-space: normal;" />

4、【单选题】已知某连续时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_8c4d6c85-b2f8-436d-8d4a-5520feba5d81.png" />系统的输入激励<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ce404598-0ee8-4f1b-b185-cc80a66c6738.png" />，系统的频率响应为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_af3c9cce-1490-4d34-96c9-1bc1ab11d884.png" />则系统的零状态响应为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6e2a3e60-1e63-46ef-83c8-e4c30dd91216.png" />为（）

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_94fe8469-af1c-4192-a872-a4f6c9b560d8.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_b16bb7dc-719f-409a-81fc-5716bce70c9f.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_60615512-f9a7-4c89-a725-31590b34f598.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_ec3d1138-aba2-4b88-92f3-905a89a91154.png" style="white-space: normal;" />

5、【单选题】已知某连续时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_25881650-a334-4cdb-af91-71abb61b7ab8.png" />系统的频率响应为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_44cd96a1-37e2-4e22-868d-44520bf37a1e.png" style="font-family: 宋体; white-space: normal;" />则信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e8d45a5a-a2f6-4a29-9da5-501c6794c4ca.png" style="font-family: 宋体; white-space: normal;" />的零状态响应为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2c61d03c-8fb4-4dc9-885a-5d6048c4cfbd.png" style="font-family: 宋体; white-space: normal;" />为（）

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9840d8de-f24a-448d-9448-230f33a7049e.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5d8bf551-7740-41ef-8004-22ca242097b8.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_89186160-3db5-45bd-a326-67ed3804f548.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_3c637ccd-bdad-4b5a-89c0-b918af79bc89.png" style="white-space: normal;" />

6、【单选题】已知某连续<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_39a0bd91-2392-4c1f-b9d6-c246effaa697.png" />系统的频率响应为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_0be1c07c-0e1a-4013-b98f-e642049b0827.png" />该传输系统是（）。

A、无失真传输系统

B、幅度无失真、相位失真的传输系统

C、幅度失真、相位无失真的传输系统

D、幅度失真、相位失真的传输系统

7、【单选题】已知理想模拟低滤波器的频率响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9ae93c44-72f3-4958-9d44-7df483c54702.png" />为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_dcb765b1-0740-489a-9d6e-2df674f7caa3.png" />若系统输入信号为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_73ddbbb1-0179-4a72-91d5-8b1c6511eb04.png" />，系统的零状态响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_a8157016-3c13-490c-8c14-490e2bae68ce.png" />( )。

A、1

B、2

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_704e94f6-4f65-49cf-a882-7223b924c312.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_34adf9d1-ae03-4ac0-a618-f5648975ac03.png" style="white-space: normal;" />

8、【单选题】已知某连续时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6daeeaa9-c046-4beb-bed7-0fed3e0b10e3.png" />系统的单位冲激响应为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bdfa77d4-45c9-438f-9e56-0e25a9cf7c58.png" />该系统的幅度响应具有（）特性。

A、低通

B、高通

C、带通

D、带阻

9、【单选题】若描述某离散时<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_fe3b6249-eb83-40f8-9692-f7ec7e0aaf68.png" />系统的差分方程为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_9582333e-8992-4b90-aa60-b83d31021ab4.png" />则该系统的频率响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_64e17fe2-e986-4b84-b5ab-24f24a9d2e75.png" />（）

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_e9d2d858-8519-4db6-b160-cf028b0e7e8f.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2f242d9b-c1d3-4569-9b5d-a9334da11e08.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_2302e3df-9910-433c-9ead-d3a9ceb61d27.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_c5a00580-dbf3-4a1a-9882-998e4ba8eb2f.png" style="white-space: normal;" />

10、【单选题】某离散<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_12d40874-e703-435b-9927-7fc0b80d95f5.png" />系统的单位脉冲响应为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_aca62eb7-30ca-47d0-9247-a61b3487e0d5.png" style="white-space: normal;" />，该系统的频率响应<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_344b859d-57de-4fc9-8333-e56196e574aa.png" style="white-space: normal;" />（）。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_6bb062b2-8b68-43a6-a3d0-ca2b86cfb982.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_99ba4d92-f819-489c-8d47-c4d3ee420e8b.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bca1a6b3-a43a-4a3e-8529-c843863de4d7.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_983058c3-3a8b-4961-8ed6-7e4621541818.png" style="white-space: normal;" />

11、【单选题】某离散LTI 系统的单位脉冲响应为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_91d72370-65f9-4b25-b701-79e51c65fc93.png" />，若该系统的输入 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_216aadfd-0e8f-418c-8d24-b7f7e7841464.png" />则该系统的输出<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_5d2aaca1-30e0-4144-b657-76892986574f.png" />（）

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_641c42ca-58fd-4047-a354-63d702f57152.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_43c6f6dc-4c9c-4887-bb27-b846e0254f4c.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_55f23eed-9eca-4c81-9dbf-e3ea0ba77562.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_471ed68a-4e1c-4ebe-b0f2-85c931b3261b.png" style="white-space: normal;" />

12、【单选题】已知某离散时间<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_84bcf817-e4ef-4464-9711-911372954d38.png" />系统的单位脉冲响应为 <img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_588e6dcf-6ce6-45b5-b9ec-bfe532e2cd37.png" />该系统的幅度响应具有（）特性。

A、低通

B、高通

C、带通

D、带阻

13、【单选题】某<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_21fa7c32-7a49-40f5-8f54-d94665681aaa.png" />广播电台播放的音乐信号的最高频率分量为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_4a071a98-6d91-4cf4-885d-adcc374070b3.png" />，该电台采用双边带幅度调制，载波的频率是<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_709772fb-533e-451e-882f-4b7eb0c94190.png" />，则已调信号的下截频和上截频分别为（）。

A、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_bf9fb309-d766-4fda-83ae-e964f40b4d0e.png" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_41b24ed2-1ef7-4f65-9b40-64e4d36a6dfc.png" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_52d0e246-44eb-48d6-8978-fb2061831193.png" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_10a5291e-26d3-43b4-8da7-7109358d9dde.png" style="white-space: normal;" />

14、【单选题】在下图所示系统中，已知输入信号<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_417be9b4-dfbd-4df5-8d9d-7d0df06b3e2d.png" />的频谱为<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_1c9460f6-ede6-46f7-95e3-a2bffe2a87f0.png" />，输出<img src="http://edu-image.nosdn.127.net/_PhotoUploadUtils_96195799-f5c7-481c-af71-ba6d0c82bddd.png" />的频谱为（）。<img src="http://edu-image.nosdn.127.net/C9724DFEC0FE3ED5B12F749892EB70B6.PNG?imageView&thumbnail=890x0&quality=100" />

A、<img src="http://edu-image.nosdn.127.net/A56E30EF7A814020D8FD404B260D93BA.PNG?imageView&thumbnail=890x0&quality=100" style="white-space: normal;" />

B、<img src="http://edu-image.nosdn.127.net/C35B3E8A94BCE65232AB7E1C1DA2CFEF.PNG?imageView&thumbnail=890x0&quality=100" style="white-space: normal;" />

C、<img src="http://edu-image.nosdn.127.net/69AB65014297F685DDC87B82077D51D3.PNG?imageView&thumbnail=890x0&quality=100" style="white-space: normal;" />

D、<img src="http://edu-image.nosdn.127.net/AADD74F950EB02796340BFE2F5752BE2.PNG?imageView&thumbnail=890x0&quality=100" style="white-space: normal;" />

信号与系统时域分析模块考试

1、【单选题】1．题1图所示的4个信号，哪个信号是确定性的连续时间能量信号（）

A、<img src="http://nos.netease.com/edu-image/CBB54EF02D98CADB39198BAF8A817738.png?imageView&thumbnail=520x520&quality=100" />

B、<img src="http://nos.netease.com/edu-image/44457DAB3A9394ECEC0C0288A68B85B6.png?imageView&thumbnail=520x520&quality=100" />

C、<img src="http://nos.netease.com/edu-image/A985D7D84842264E14B5F1C48018C337.png?imageView&thumbnail=520x520&quality=100" />

D、<img src="http://nos.netease.com/edu-image/D47F00349F65E6E364DD955326F6B691.png?imageView&thumbnail=520x520&quality=100" />

2、【单选题】序列<img src="http://img2.ph.126.net/WG0rGNHvUv5wclZY9o0T4Q==/6630141976909990232.png" />的周期等于（）

A、6

B、8

C、12

D、24

3、【单选题】某连续时间系统，其初始状态为<img src="http://img1.ph.126.net/fnfJBsep61NLp8ysRUDRQQ==/6631396519676435221.png" />，输入激励为<img src="http://img2.ph.126.net/mdupcFxlsOkyvuscItqFIQ==/6608438716887735791.png" />，系统的完全响应为<img src="http://img0.ph.126.net/An0Bj4yw02TeJvCw4kT1Qw==/6619515197025592278.png" />，若<img src="http://img0.ph.126.net/ATnQyz014O88b7h-HXKEYw==/6619425037073291301.png" />，则该系统为( )

A、线性时变系统

B、线性时不变系统

C、非线性时变系统

D、非线性时不变系统

4、【单选题】若描述离散时间系统的差分方程为<img src="http://img0.ph.126.net/UQ4jiefFEBZpGtf8e_dLhQ==/1043146263707940198.png" />,试该系统为( )

A、因果线性时不变系统

B、因果线性时变系统

C、非因果线性时不变系统

D、非因果非线性时不变系统

5、【单选题】已知某线性非时变连续系统，当其初始状态<img src="http://img2.ph.126.net/ss-fqNkZbbXyJ4ZcVZ0SvA==/6631378927490398820.png" />时，系统的零输入响应<img src="http://img1.ph.126.net/6UVombhuMgc5lOi_F6Y7Ww==/6630344287049497639.png" />，<img src="http://img0.ph.126.net/cyenSRlB6DToxitEngdarw==/1605533267257716153.png" />。若在初始状态<img src="http://img1.ph.126.net/9WAnHzbPGJP_a8zmn3cqMw==/6630690633212751418.png" />以及输入激励x(t)共同作用下产生的系统完全响应<img src="http://img0.ph.126.net/5DNZ_bnDv_fOAsnOVhDSrQ==/6630391566049496448.png" />，<img src="http://img0.ph.126.net/cyenSRlB6DToxitEngdarw==/1605533267257716153.png" />，则系统在初始状态<img src="http://img1.ph.126.net/9WAnHzbPGJP_a8zmn3cqMw==/6630690633212751418.png" />以及输入激励为<img src="http://img1.ph.126.net/d2hDteGtQ1EQImpnEZvHwA==/6630660946398808807.png" />共同作用下产生的系统完全响应<img src="http://img2.ph.126.net/u1200zL8FTatBkVTwEiunw==/6630202450049517182.png" />( )

A、<img src="http://img1.ph.126.net/DMudY0AAnGn1jJcSigN9Og==/6631253583165219772.png" />

B、<img src="http://img0.ph.126.net/eREw05M_T0QuqXrMatiQlA==/6630663145422260619.png" />

C、<img src="http://img0.ph.126.net/wztsHquEUY9hRqWbeshHwg==/6631445997700116156.png" />

D、<img src="http://img1.ph.126.net/6jRDhk0xLq3UWJBaoGilDQ==/6630921530654789191.png" />

6、【单选题】计算信号<img src="http://img0.ph.126.net/_fk28mORnHALD3fedQe4Bg==/6631300862165231649.png" />的值为( )

A、<img src="http://img0.ph.126.net/wV4Ng9eIfsvFKKdXNeK8RA==/6630637856654824278.png" />

B、<img src="http://img1.ph.126.net/_RoE7lqtjDkgLq6jbpLdOA==/6630826972654798960.png" style="white-space: normal;" />

C、<img src="http://img2.ph.126.net/EktT5HOix1ukYzMgvPAd5w==/6630438845049487664.png" />

D、<img src="http://img0.ph.126.net/syWk7sgCWzxHuJrCGNHgpQ==/6608551966585017441.png" />

7、【单选题】计算积分<img src="http://img0.ph.126.net/6UBe0gmmB6FIrwtSfPRJEg==/6630083702793718935.png" style="width: 166px; height: 51px;" />的值为( )

A、<img src="http://img0.ph.126.net/vJSOGM3tPk6TqNQoSWsXvw==/3662270922082778631.png" />

B、<img src="http://img1.ph.126.net/UHMc18QI_78atv0Va4sdOg==/6630432247979068936.png" />

C、<img src="http://img1.ph.126.net/lOBn7SpT9Wj7O4-YEeusbA==/567735028043342215.png" />

D、<img src="http://img1.ph.126.net/qtBU8y4E8XMryd-5N4ERJA==/6630673041024475429.png" />

8、【单选题】已知信号 x(t) 的波形如题8图所示，可以表示为 ( )<img src="http://nos.netease.com/edu-image/69E0993F80FAE107A722F355452DE55A.png?imageView

A、<img src="http://img1.ph.126.net/2bIO4-b-aKW6nwVBVesTnQ==/6630910535538511579.png" />

B、<img src="http://img2.ph.126.net/iBAGtBlGyYlvApipoUCYgQ==/6630708225399003122.png" />

C、<img src="http://img2.ph.126.net/LGxgY719IRmhWXA_WRu4DA==/6630183758351843246.png" />

D、<img src="http://img1.ph.126.net/mJyR_unRbgD-zDxHINflOA==/6631286568514064974.png" />

9、【单选题】关于虚指数序列描述正确的是( )

A、虚指数序列<img src="http://img2.ph.126.net/Uqj0XHwsjQWI7xCo0_tO0Q==/6630103494003015182.png" />不具有周期性。

B、虚指数序列<img src="http://img0.ph.126.net/uac3bUq1aB_BV6dcyT77fQ==/6631316255328019440.png" />一定是周期序列。

C、对连续周期信号<img src="http://img1.ph.126.net/tnBDZWPhYtou5JmgEGNw0g==/6631370131397778874.png" />进行抽样所得虚指数序列<img src="http://img0.ph.126.net/uac3bUq1aB_BV6dcyT77fQ==/6631316255328019440.png" />，两者周期一定相等。

D、虚指数序列<img src="http://img0.ph.126.net/uac3bUq1aB_BV6dcyT77fQ==/6631316255328019440.png" />的振荡频率不一定随角频率<img src="http://img2.ph.126.net/1j8IT3-tKKyW2epCKYpPNw==/6631211801723380349.png" />的增加而增加。

10、【单选题】下列关系式表述错误的是( )

A、<img src="http://img1.ph.126.net/6pRPdtUy3XLDhOaowl9R3Q==/6631207403676634666.png" />

B、<img src="http://img1.ph.126.net/-LV4lG1K_LuJwF2wJl6XUQ==/6630487223561056885.png" />

C、<img src="http://img2.ph.126.net/YMdcNqud8WtIptGlit-vlg==/6630773096585035319.png" />

D、<img src="http://img0.ph.126.net/iJS19bsuoIRRBu_sS9b81A==/6630183758351843484.png" />

11、【单选题】已知信号 x(t) 的波形如题11图所示，可以用u(t)和r(t)表示为( )<img src="http://nos.netease.com/edu-image/EA257936F01EBA7366961F1B6071219B.bmp?imageView

A、<img src="http://img2.ph.126.net/DlHKvkQP7tkxsoeDAvQlgQ==/6630786290724573020.png" />

B、<img src="http://img1.ph.126.net/pFW43LecSHAgvPLu9WAYGw==/6630227738816961208.png" />

C、<img src="http://img1.ph.126.net/r1_UaiKHY2yeqXL09CHWKw==/6630614766910647454.png" />

D、<img src="http://img1.ph.126.net/3gifPqlgrUxJyLmA7TXpzA==/6630590577654829405.png" />

12、【单选题】已知信号 x(t) 的波形如题12图所示，x'(t)的波形表示正确的是 ( ) <img src="http://nos.netease.com/edu-image/8D8B16D32B4271C58B27C8C559FE9F17.bmp?imageView

A、<img src="http://nos.netease.com/edu-image/0AD6E7BF1322C64E2A82811B6D73CF1E.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

B、<img src="http://nos.netease.com/edu-image/BAF5163C91FE64AD3B5C9C601538D1CC.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

C、<img src="http://nos.netease.com/edu-image/0EF1FABCF3EB82CE416A337270639D29.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

D、<img src="http://nos.netease.com/edu-image/B38A7A665679333CFBC5923F49BF91D7.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

13、【单选题】1．已知信号x[k]的波形如题13图所示，其表达式错误的是( )<img src="http://nos.netease.com/edu-image/14C502458297AF26A3EBADCC4695A9CA.bmp?imageView

A、<img src="http://img2.ph.126.net/qFJn0Ms-1QsfjQgdvM_F9w==/6630763200980390729.png" />

B、<img src="http://img1.ph.126.net/IENYjeCq8p-D1YmhMvAEaA==/6630149673491389873.png" />

C、<img src="http://img2.ph.126.net/GFof9L5WaX6qMxYrfHn43Q==/6630395964096012008.png" />

D、<img src="http://img2.ph.126.net/eMg-h5U5bUEnok88oEv5yQ==/6631299762653612735.png" />

14、【单选题】已知信号<img src="http://img2.ph.126.net/mdupcFxlsOkyvuscItqFIQ==/6608438716887735791.png" />的波形如题14图所示，<img src="http://img1.ph.126.net/UzZCRuwLtPODD_RT2WKPTg==/6630601572771108136.png" />的波形为( )<img src="http://nos.netease.com/edu-image/8F60C672353A32B446057C7E659B0399.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

A、<img src="http://nos.netease.com/edu-image/66C8EB52E3F2296A05862BF60A50C07F.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

B、<img src="http://nos.netease.com/edu-image/F1D738DF02D88AED0568A24BA2EFCD4C.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

C、<img src="http://nos.netease.com/edu-image/70345EDEAA643EEE0A04A80C6CD3CE53.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

D、<img src="http://nos.netease.com/edu-image/2CA73524F177B746E33AB28F89E4C685.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

15、【单选题】若离散序列<img src="http://img0.ph.126.net/lO-gblkr1JmNrAvOJnY0WQ==/6631289867048859249.png" />，则下面4个表达式中哪个不是<img src="http://img1.ph.126.net/CJ88RTVQHmZRpdSrUv_FBw==/2646709206028425931.png" />的奇分量（）

A、<img src="http://img0.ph.126.net/OqcZ48IAXHPH9j4ayBrqug==/6630626861538552585.png" />

B、<img src="http://img2.ph.126.net/U1HRNGYCkTPn74pAVPcjcw==/6631548252281100071.png" />

C、<img src="http://img1.ph.126.net/wGt6VUbCdCYhCP246wFJYw==/6630138678375111301.png" />

D、<img src="http://img0.ph.126.net/k7S9-pVL8Z53STDJyG4hyg==/6630706026375753552.png" style="white-space: normal;" />

16、【单选题】若某连续时间LTI系统的冲激响应<img src="http://img0.ph.126.net/X6jFmRFizS-kd9KIQBaPng==/6631432803560570316.png" />，则该系统的单位阶跃响应<img src="http://img1.ph.126.net/I5-0DQrXeaIWe3QXrLtOUQ==/6619234821560533816.png" />为( )

A、<img src="http://img0.ph.126.net/cjJoVuzrkyVnUZrhdK-haA==/6630853360933882764.png" />

B、<img src="http://img0.ph.126.net/aCJkHdz3nqfj1loGwWS7Pw==/6631304160700124454.png" />

C、<img src="http://img2.ph.126.net/Bq2hI9oEA9qbfK4-5PBeHg==/6630747807817609019.png" />

D、<img src="http://img2.ph.126.net/n4DN2Y896MO13xalnqVlhA==/6630397063607640071.png" />

17、【单选题】若某离散时间LTI系统在<img src="http://img0.ph.126.net/228cwLwPkBvozGNeTj1vxA==/6631319553862491930.png" />激励下产生的响应为<img src="http://img2.ph.126.net/kayUeN9PpRRiKgA0U0UoJg==/6630832470212738360.png" />，则该系统在<img src="http://img2.ph.126.net/Bkv3zKBex0L86eFW5IoMkQ==/6631244787071791226.png" />激励下产生的响应<img src="http://img1.ph.126.net/sdQiomq8VI0PdDzn0kBI6w==/6630936923817594298.png" />( )，<img src="http://img0.ph.126.net/yiI6Fdxn-_jt32nGDfc70Q==/6632328905538924102.png" />如题17图所示<img src="http://nos.netease.com/edu-image/F9DF9894CF8F17ABDB74E1BADFEEB516.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

A、<img src="http://img1.ph.126.net/0ptge43L1cGbFO6pJjsKXA==/6631242588048970648.png" />

B、<img src="http://img2.ph.126.net/l5WCIgtrTfnliOVhlyJ5vw==/6631210702211761634.png" />

C、<img src="http://img2.ph.126.net/OoJTNaDbYOOi0wLNDf_43g==/6630577383515299145.png" />

D、<img src="http://img2.ph.126.net/AoSeNFXWVcDQ8zxXpk9vVA==/6631409713816388153.png" />

18、【单选题】若描述某二阶连续时间LTI系统的微分方程为<img src="http://img2.ph.126.net/25h_AglwzhFkQbawXjkedw==/6631200806607121220.png" style="font-family: 宋体; font-size: 14px;" />初始状态<img src="http://img0.ph.126.net/g0uyR6BPtD2N-xXQLlRLfg==/6630911635050147735.png" />，则零输入响应是 ( )

A、<img src="http://img2.ph.126.net/4T8sNTEODDGy21QPBBobfQ==/6630723618561621014.png" />

B、<img src="http://img0.ph.126.net/Tq2HdrmMmPsT9l4Qedl1oQ==/6630576284003673450.png" />

C、<img src="http://img2.ph.126.net/AtlVaUdal9ykpaB8OaBs3A==/6631436102095463975.png" />

D、<img src="http://img0.ph.126.net/oupJKjsq8s2qC1EkHbbOMA==/6630421252863451170.png" />

19、【单选题】若描述某二阶连续时间LTI系统的微分方程为<img src="http://img2.ph.126.net/Mh2fqZyXkScjy8HXlON2iw==/6630832470212947253.png" />则该系统单冲激响应<img src="http://img2.ph.126.net/YoO7EfHQYOrYf7tAbwy6AA==/6619398648792915044.png" />的形式为（）

A、<img src="http://img2.ph.126.net/xISgtpC4B-2Bf8Muvt3q5A==/6631367932374542729.png" />

B、<img src="http://img1.ph.126.net/SwZQkS22bhrAMSHOYBUUTA==/6630883047747824611.png" />

C、<img src="http://img1.ph.126.net/CiDtqoT4zSN1Fnrl-VgUpw==/6631221697328050066.png" />

D、<img src="http://img2.ph.126.net/tzExbFw1_imjmd36meCFnw==/6630747807817611791.png" />

20、【单选题】<img src="http://img0.ph.126.net/Rm6QvT9J7buB9lc9KnOSTg==/6631316255328039003.png" />不等于下面四个表达式中的哪一个？（）

A、<img src="http://img2.ph.126.net/PFy22vg2A7yRwog4MwMv4A==/6630607070329250621.png" />

B、<img src="http://img1.ph.126.net/Y2Z1VKOjVARJXJOWmHSQAQ==/6631341544095475726.png" />

C、<img src="http://img0.ph.126.net/h7SGNclT794AeIwCiVOJmg==/6630620264468792331.png" />

D、<img src="http://img1.ph.126.net/az0ZsAY3aC6QKraIbm3Ppg==/6630203549561151553.png" />

21、【单选题】某连续时间LTI系统，若激励信号<img src="http://img2.ph.126.net/mdupcFxlsOkyvuscItqFIQ==/6608438716887735791.png" />和系统单位冲激响应<img src="http://img2.ph.126.net/YoO7EfHQYOrYf7tAbwy6AA==/6619398648792915044.png" />如题21图所示，则其零状态响应<img src="http://img1.ph.126.net/MBdW4kvYpwsQ2yecdFvFoA==/6630690633212751385.png" />在<img src="http://img1.ph.126.net/5MK1FOz-SFwc1pbGdezD8w==/2440950998053333177.png" />,<img src="http://img2.ph.126.net/-PvRaUujXii-FNjgyyhPrA==/65302194614461292.png" />和<img src="http://img0.ph.126.net/IJkRGJ64ylHT78PG50fmkQ==/6608659718725195755.png" />时的值<img src="http://img1.ph.126.net/O7T9u2WCnTOdLmaBrO9umg==/6631341544095475786.png" />和 <img src="http://img2.ph.126.net/x1xExj48Uyg97dXeZYcgOA==/6630881948236196915.png" />分别为（）<img src="http://nos.netease.com/edu-image/C7FE164A648D42A96F1288A33AFFFA8A.bmp?imageView

A、<img src="http://img2.ph.126.net/CZSDiKJYto_9zr4pW_Mpdg==/6631430604537325433.png" />

B、<img src="http://img0.ph.126.net/qXw0gjLXPbn2gFZqJhF53A==/6631226095374561372.png" />

C、<img src="http://img0.ph.126.net/y6AOFYSGw4G9hel6ZgkDbQ==/6630533403049480596.png" />

D、<img src="http://img2.ph.126.net/g8RF6JT1weJUZghzj1_MOQ==/6630328893886716239.png" />

22、【单选题】连续时间LTI系统<img src="http://img1.ph.126.net/x37MqyboRmkmAGSSayO4Vg==/6631228294397816950.png" />其冲激响应<img src="http://img0.ph.126.net/7e1K6yU4nqiS7SYMW7Udpg==/6630736812701336382.png" />，若激励信号<img src="http://img1.ph.126.net/puxl3880_kt2_mC8mKoeMQ==/6630879749212941415.png" />，则该系统的零状态响应是（）

A、<img src="http://img2.ph.126.net/cZIPFen2ajS9S5pQ_gxCmQ==/6630572985468790442.png" />

B、<img src="http://img2.ph.126.net/_af8iMEjbrZtelLek3nDzg==/6631421808444302459.png" style="white-space: normal;" />

C、<img src="http://img0.ph.126.net/WWUoxc4_mBgessnA1gCshw==/6631305260211763158.png" />

D、<img src="http://img2.ph.126.net/vC7db7Q_HZYfCBGG023GfQ==/6630220042235571302.png" />

23、【单选题】已知某系统连续时间LTI系统如题23图所示，则系统的单位冲激响应<img src="http://img1.ph.126.net/LP321KYgU_r02LNv5_RQXg==/6630156270561159133.png" />（）<img src="http://nos.netease.com/edu-image/E1BE87DBB042D881884E646ED8915AD2.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100" />

A、<img src="http://img0.ph.126.net/SPrUMySNBbFotWTl0vwtyA==/6630717021491854710.png" />

B、<img src="http://img0.ph.126.net/teNU1kOeHuDZizCb9ka9Gw==/6631384425048968733.png" />

C、<img src="http://img1.ph.126.net/KjtvYdYi5FNtI5Nf-5OQKw==/6631241488537354102.png" />

D、<img src="http://img2.ph.126.net/-GdReBr2y7fiAc_gyyzzUw==/6630726917096686571.png" />

24、【单选题】若某因果离散时间LTI系统的差分方程为<img src="http://img1.ph.126.net/rWN-CeK1_RkrcMJQ7Q3HqA==/6630079304747214604.png" />初始状态<img src="http://img0.ph.126.net/Q5krcrgXoUj8XIIUWxc-Uw==/6630443243096005122.png" />，则零输入响应<img src="http://img0.ph.126.net/qG6IbWMjR8w-n2lJvBzDSQ==/6630780793166408871.png" />为（）

A、<img src="http://img2.ph.126.net/DSMH-3oclhYeC1E6Lkq9kw==/6630106792537905683.png" />

B、<img src="http://img2.ph.126.net/HcxVCVkGQTnq1gy68q0yrg==/6631341544095476168.png" />

C、<img src="http://img0.ph.126.net/-2-HesmIKUwieS_IaMtXIw==/6630790688771090145.png" />

D、<img src="http://img2.ph.126.net/ROg8YRzdDgOOdFvmZp8kKw==/6630931426259458190.png" />

25、【单选题】若某离散时间LTI系统的差分方程为<img src="http://img0.ph.126.net/lbV4e3sqG5dUJ_KDITrE_g==/6630078205235586912.png" />则该系统的单位脉冲响应<img src="http://img0.ph.126.net/MPJfpn6wbnaTYUdkVyVdDg==/6630728016608283093.png" />为( )

A、<img src="http://img0.ph.126.net/9sVNpAyb2I0qo64X3q-O0Q==/6630786290724579174.png" />

B、<img src="http://img1.ph.126.net/Hb5scUz8j7mwA0oIjBl2Zg==/6631317354839667400.png" />

C、<img src="http://img2.ph.126.net/ZfzEafbCOJtEjphSBNtLqw==/6631333847514081917.png" />

D、<img src="http://img2.ph.126.net/BWPDK6N5zcdH2RUz2ZNaCA==/6630087001328609123.png" />

26、【单选题】拟通过、A、B、C、D推导离散时间LTI系统零状态响应<img src="http://img0.ph.126.net/3iIhIeIh5Wu9R1RLEay_ig==/6631241488537236837.png" />的计算公式，哪一步有错误？（）

A、由于<img src="http://img2.ph.126.net/rhTrbFFyvDmZ-spP2oXEVw==/6631249185118729331.png" />

B、利用非时变特性<img src="http://img2.ph.126.net/XZAO_N1J2rcq-NwjrUryuw==/6631345942141998404.png" />

C、利用线性特性<img src="http://img1.ph.126.net/oQCoj9DKRcf5Lcv-m9jcrQ==/6631359136281524608.png" />

D、利用积分特性即得<img src="http://img2.ph.126.net/eYSfyt6fN0FawBP-ml6WOw==/6630137578863485549.png" />

27、【单选题】若某离散时间LTI系统的单位脉冲响应<img src="http://img2.ph.126.net/COnrRz8iAslul34GT8rmEw==/6630820375585038422.png" />，输入序列<img src="http://img0.ph.126.net/WLM3OgLXd-Ql81vInmbQhw==/6630315699747186552.png" />，则系统的零状态响应<img src="http://img1.ph.126.net/CBytF6wy50E1m5XMIFCnIQ==/6630294809026096807.png" />在<img src="http://img2.ph.126.net/DnE0FV1_Dp2nNmkeCOVeCA==/6630697230282734816.png" />的值<img src="http://img1.ph.126.net/-JWHnXJWXMAm-6AHmwOTpQ==/6631380027002458156.png" />为（）。

A、-1

B、0

C、3

D、5

28、【单选题】若某离散时间LTI系统，其输入<img src="http://img0.ph.126.net/esD_i2vIuTD1eUS7FTfklA==/6631326150932688288.png" />，单位脉冲响应<img src="http://img2.ph.126.net/_UxA-GdvCbfqow9r-eIm0w==/6630326694863461061.png" /> ，则系统的零状态响应<img src="http://img2.ph.126.net/vWc1nLNJngwloE2alZ3bQg==/6631282170467573939.png" />( )。

A、<img src="http://img1.ph.126.net/1ar-e-IElNhWZt9daqXPrQ==/6630780793166440495.png" />

B、<img src="http://img1.ph.126.net/qWT1gyYxqSG3r1j1TU9TeQ==/6630910535538520621.png" />

C、<img src="http://img0.ph.126.net/46d6ot8--kIvH5eWi6PVmA==/6630928127724575097.png" />

D、<img src="http://img2.ph.126.net/Kp8Gv6lzlmadPzaj2SwfbA==/6631208503188516785.png" />

29、【单选题】若某因果离散时间LTI系统的差分方程为<img src="http://img0.ph.126.net/-edZoYEZwT1IavS4FRcBoQ==/6630355282165782699.png" />初始状态<img src="http://img2.ph.126.net/wdyDvcVbKQgp24C-GduEeA==/6630574084980418664.png" />激励<img src="http://img2.ph.126.net/7OZLKIC7rAmAydbJSl_O1Q==/6631341544095476642.png" />，则可求出系统的完全响应<img src="http://img2.ph.126.net/Jk3LfxwfzEKpaXkt5qPyXw==/6630265122212309687.png" />。试判断下面四个选项中，哪个是固有响应（）

A、<img src="http://img0.ph.126.net/FMrxEbamvf4xq5flpxkrhw==/6630735713189709237.png" />

B、<img src="http://img0.ph.126.net/O5ElD8FnJJf-Nx-LTSzxMw==/6631424007467558829.png" />

C、<img src="http://img0.ph.126.net/syWk7sgCWzxHuJrCGNHgpQ==/6608551966585017441.png" />

D、<img src="http://img1.ph.126.net/2Ibeq9DyWXjRt3y6-S8UpA==/6631428405514069957.png" />

30、【单选题】已知N=5点滑动平均系统的输入输出关系为<img src="http://img2.ph.126.net/bBTt6vB7juq7XrK1q1-vUQ==/6631396519676867114.png" />，则系统( )

A、非因果、稳定

B、因果、不稳定

C、非因果、不稳定

D、因果、稳定

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