Question: Question 4. Select the statement that best describes the PM wave. a. The PM modulated signal changes carrier phase angle to represent the message; however,

Question 4. Select the statement that best describes the PM wave.

a. The PM modulated signal changes carrier phase angle to represent the message; however, it is difficult to see these phase changes in the plot.

b. The PM signal appears to change frequency with the message; however it does not use changes in frequency to represent the message.

c. Although PM and FM are angular modulation techniques, they cannot be used interchangeably.

d. All statements are correct.

AM modulation Message amplitude amplitude 1 2 3 time 10-3 combined message and PM signal 0 1 2 3 time 10-3 combined message and FM signal amplitude amplitude 0 1 2 12 time 10-3 3 x103 time

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