4) The pulsed cosine signal shown in the following figure 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 200 rad/s. JOA N -10 10 1 20 2150 200 10 t (ms) a) Sketch the frequency spectrum for this signal. b) How would the frequency spectrum change if the frequency of the cosine wave was doubled? c) How would the frequency spectrum change if the "off" time was halved?
4) The pulsed cosine signal shown in the following figure 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 200 rad/s. JOA N -10 10 1 20 2150 200 10 t (ms) a) Sketch the frequency spectrum for this signal. b) How would the frequency spectrum change if the frequency of the cosine wave was doubled? c) How would the frequency spectrum change if the "off" time was halved?
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Transcribed Image Text:4) The pulsed cosine signal shown in the following figure 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 200 rad/s.
A
0
10
20
190 200 10
1 (ms)
a) Sketch the frequency spectrum for this signal.
b) How would the frequency spectrum change if the frequency of the cosine wave was
doubled?
c) How would the frequency spectrum change if the "off" time was halved?
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