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The radian frequency value(s) for which the discrete-time sinusoidal signal...


Q.56

The radian frequency value(s) for which the discrete-time sinusoidal signal

x[n] = A cos(ฯ‰n + ฯ†)

has a period of value 20 are:

(A) 0.1ฯ€
(B) 0.25ฯ€
(C) 0.3ฯ€
(D) 0.45ฯ€
Answer: A Solution ฯ‰n = 2*pi*k (k is integer) or, w.20 = 2*pi*k or, w = 2*pi*k / 20 or, w = 0.1*pi*k
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