2009年4月自学考试通信概论试题(后附答案)（Introduction to communication test for self taught Examination in April 2009 (attached answer)）.docVIP

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2009年4月自学考试通信概论试题(后附答案)（Introduction to communication test for self taught Examination in April 2009 (attached answer)）.doc

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2009年4月自学考试通信概论试题(后附答案)（Introduction to communication test for self taught Examination in April 2009 (attached answer)）

2009年4月自学考试通信概论试题(后附答案)（Introduction to communication test for self taught Examination in April 2009 (attached answer)） In April 2009 the national communication Conspectus self-study exam (with answers) Course Code: 04742 A single choice (the title of 25 items, each item of 1 points, a total of 25 points) In the four option of each item listed in only one is in line with the requirements of the subject, please fill in the code in question after the brackets. The wrong choice or not, choose no points. The substance 1. communication transmission and exchange (is) A. B. text data C. D. image information The 2. source is the birthplace of the news, its role is to convert the message to the original sensor signal, which is completed () Non electric power conversion A. - B. power - electricity conversion C. electric - light conversion of D. light - electricity conversion 3. the destination is the destination of the message transmission. The function and source () The same A. B. instead Similar to C. not D. One of the 4. main functions of the source encoding is carried out on the analog signal () A. modulus (A / D) conversion B. digifax (D / A) conversion C. code conversion of D. linear and nonlinear transformation The main performance indexes of the 5. communication system (is) A. adaptability and economy of B. standard and maintenance C. validity and reliability and availability of the D. standard 6. analog communication system effectiveness measurement (available) The bandwidth of A. B. BER C. band utilization rate of the output SNR of D. 7. is usually used to measure the analog communication system receiver reliability (is) The output SNR of A. B. BER The bandwidth of C. D. bandwidth utilization Available to evaluate the reliability of the digital communication system (8.) The output SNR of A. B. error rate The bandwidth of C. D. information rate 9. Shannon formula can achieve communication system () A. the best information transmission rate of B. is the lowest rate of