Select the correct statement regarding the difference between
the FM modulated signal waveform and the AM modulated signal
waveform.
a. The FM signal wave changes frequency according to the message
wave m(t). The "peak" amplitude of the FM signal, Ac=5, remains
constant.
b. There is no difference between the FM and AM signal waves
because they are both modulated by the same message wave, m(t) =
Amcos(2πfmt)
c. The AM signal wave frequency changes with the message wave m(t)
while the amplitude of the FM signal changes with m(t).
d. All statements are correct.
Homework Answers
Among all the statements the correct statement along with the reason is given:
a. The FM signal wave changes frequency according to the message wave m(t). The "peak" amplitude of the FM signal, Ac=5, remains constant.
Reason:True,It is because in FM technique,the m(t) doesn't modulate the amplitude of the carrier wave.In FM,the frequency of the carrier signal gets varied linearly with the message signal.The amplitude and the phase of carrier signal remains constant but the frequency of carrier changes.
b. There is no difference between the FM and AM signal waves because they are both modulated by the same message wave, m(t) = Amcos(2πfmt).
Reason:False,there is much difference between AM and FM modulation.In AM,the amplitude of carrier signal/wave is changed accordingly with the amplitude of input/message signal.In FM,the frequency of carrier wave/signal is changed accordingly with the amplitude of input/message signal.Due to this difference FM and AM signal waves can't be modulated by the same message wave.
c. The AM signal wave frequency changes with the message wave m(t) while the amplitude of the FM signal changes with m(t).
Reason:False,in AM the amplitude of carrier wave varies accordingly with the amplitude of input signal.Hence the resultant AM modulated signal is produced.In case of FM the frequency of carrier wave varies accordingly with the amplitude of the message signal which means the frequency of FM modulated wave increases with the increase in amplitude of message signal
d. All statements are correct.
Reason:Only the first statement is correct as mentioned above.
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