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Unformatted text preview: Sampling it every . 05 sec leads to the sequence sin( n ) of period N = 2 samples. This sequence also covers phase change per period. sin(0 . 3 n ) and sin(3 . 7 n ) have the same angular frequency. September 26, 2011 DRAT 2 Problem 3.13 Which of the following sequences are periodic? (a) e j 9 n . (b) e j 9 n u ( n ) . (c) e j 9 n 2 . (d) e j 9 ( n-2) . Problem 3.15 Which of the following sequences are periodic? (a) sin( 3 ( n-4)) . (b) sin( 3 n 4 ) . (c) sin(- 3 n + 4 ) . (d) sin 2 ( 3 n ) . Problem 3.17 Find the period of the sequence x ( n ) = cos p 3 n + 6 P sin p 6 n + 8 P Problem 3.28 Assume x ( n ) has period N . Are the following sequences periodic? If so, determine their periods in terms of N : (a) x (3 n + 3) ? (b) x (2 n ) ? September 26, 2011 DRAFT...
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- Fall '08