The pulsed cosine signal shown in Figure P5.23 is “on” for two cycles and then “off’ for a
period of time equivalent to 18 cycles of the cosine wave. The signal is periodic, and the
frequency of the cosine wave is 2000π rad/s.
(a) Sketch the frequency spectrum for this signal.
(b) How would the frequency spectrum change if the frequency of the cosine wave were doubled’?
(c) How would the frequency spectrum change if the “off” time were halved?
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