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Unformatted text preview: 6.003 Homework 12 Due at the beginning of recitation on Wednesday, May 5, 2010 . Problems 1. Sampling CT sinusoids Consider 3 CT signals: x 1 ( t ) = cos(3000 t ) , x 2 ( t ) = cos(4000 t ) , and x 3 ( t ) = cos(5000 t ) . Each of these is sampled as follows x 1 [ n ] = x 1 ( nT ) , x 2 [ n ] = x 2 ( nT ) , and x 3 [ n ] = x 3 ( nT ) , where T = 0 . 001. Which of the resulting DT signals has the highest DT frequency? Which has the lowest DT frequency? 2. Sampling with alternating impulses A CT signal x c ( t ) is converted to a DT signal x d [ n ] as follows: x c ( nT ) n even x d [ n ] = − x c ( nT ) n odd a. Assume that the Fourier transform of x c ( t ) is X c ( jω ) shown below. ω X c ( jω ) W 1 Determine the DT Fourier transform X d ( e j Ω ) of x d [ n ]. b. Assume that x c ( t ) is bandlimited to − W ≤ ω ≤ W . Determine the maximum value of W for which the original signal x c ( t ) can be reconstructed from the samples x d [ n ]....
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 Spring '11
 DennisM.Freeman
 Digital Signal Processing, Trigraph, Continuous signal, Nyquist–Shannon sampling theorem, Fourier transform Xd

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