# E#3 - ECSE-2410 SIGNALS AND SYSTEMS FALL 2004 Rensselaer...

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ECSE-2410 SIGNALS AND SYSTEMS FALL 2004 Rensselaer Polytechnic Institute EXAM #3 (2 hours) November 17, 2004 Check One: C Sect. 1 8:30am (Wozny) NAME: __________________________________________ C Sect. 2 10:00 am (Radke) Do all work on these sheets. Tables will be handed out separately. One new page of crib notes allowed. Calculators allowed. Label and Scale axes on all sketches and indicate all key values. Show all work for full credit. Total Grades for Exam: PART I 1 Grades for Points Score Part I 50 Part II 50 TOTAL 100 Problem Points Grade 1 20 2 20 3 10 TOTAL 50

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1(20). Farmer Oppenheim has two normal [i.e. double sideband, synchronous (or suppressed carrier) demodulation] AM stations with bandwidths of 50x10 3 rad/sec.. Station 1 has carrier frequency 300 x10 3 rad/sec. and Station 2 has carrier frequency 400 x10 3 rad/sec.. a. (10) Farmer Oppenheim uses frequency-division multiplexing to broadcast the signal ) 40000 cos( ) ( 1 t t x = on Station 1 and the signal ) 10000 cos( ) ( 2 t t x = on Station 2. Plot the overall frequency spectrum of the channel. Label all axes.
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