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Unformatted text preview: Sampling it every . 05 sec leads to the sequence sin( πn ) of period N = 2 samples. This sequence also covers π phase change per period. sin(0 . 3 πn ) and sin(3 . 7 πn ) have the same angular frequency. September 26, 2011 DRA±T 2 Problem 3.13 Which of the following sequences are periodic? (a) e j π 9 n . (b) e j π 9 n · u ( n ) . (c) e j π 9 n 2 . (d) e j π 9 ( n2) . Problem 3.15 Which of the following sequences are periodic? (a) sin( π 3 ( n4)) . (b) sin( π 3 n 4 ) . (c) sin(π 3 n + π 4 ) . (d) sin 2 ( π 3 n ) . Problem 3.17 Find the period of the sequence x ( n ) = cos p π 3 n + π 6 P · sin p π 6 n + π 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
 Walker
 Frequency, Hertz

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