95下信號與系çµ&plusmn

95下信號與系統

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Signals and Systems Final Exam 9:20a.m. ~ 11:20a.m., June 22, Fri., 2007 z Closed book, but open 1 sheet (both sides, 2 pages) of personal notes of A4 size z Total score: 120 z Total 3 pages in one B4 sheet 1. [12] A continuous-time LTI system with frequency response () Hj ω is constructed from two continuous-time LTI systems with frequency responses 1 and 2 , respectively. The straight-line approximations of the Bode magnitude plots of 1 and are shown in the following figure. All of the poles and zeros of 1 Hs and are on the real axis. a) [4] Specify 2 if 1 and 2 are connected in cascade form. b) [4] Specify 2 if 1 and 2 are connected in parallel form. c) [4] Specify 2 if 1 and 2 are connected in negative feedback form with 2 in the feedback loop. 2. [12] Figure (a) below shows a model of amplitude modulation system using a pulse-train carrier. a) [4] Let x t be a band-limited signal with ( ) 0 for / X jT ωω π =≥ , as shown above. Determine and sketch R j and Qj . b) [4] Find the maximum value of Δ such that wt xt = with an appropriate filter M j .
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This note was uploaded on 02/21/2012 for the course EE 101 taught by Professor 張捷力 during the Spring '07 term at National Taiwan University.

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95下信號與系統

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