Please answer from 1-5. Its multiple choice 1. Select the best answer regarding

Question

Please answer from 1-5. Its multiple choice

1. Select the best answer regarding your observation from the graph below

a. both s(t) and b(t) appear as identical sine waves

b. both s(t) and b(t) appear as identical cosine waves

c. s(t) appears as a sine wave while b(t) appears as a cosine wave

d. s(t) appears as a cosine wave while b(t) appears as a sine wave

2. The signal, s(t), shows signal distortion and the receiver will be unable to recover the transmitted message (True or False)

3. Having changed the message amplitude to Am=100, select the correct statement

a. The signal, s(t), will be received without distortion because the frequency of the signal is between 0 and 1

b. The signal, s(t), will be received without distortion because the AM Modulation Index of the signal is between 0 and 1

c. The signal, s(t), will be received without distortion because the amplitude of the carrier is too high

d. The signal, s(t), will be distorted because the AM modulation index is not within the required range: 01

4.Change the frequency of the message to fm=500 and the message amplitude to Am=5.

Select the correct statement that describes what you see in the plots:

a. The signal, s(t), is distorted by the dramatic change in message frequency.

b. The message frequency change can be seen in the plot of s(t). When comparing plots for s(t) and m(t), it is obvious that the signal accurately represents the message.

c. Both the message and carrier frequencies increase, thus no distortion will be experienced.

d. The phase of the signal has shifted to the right, because AM techniques impact phase and amplitude.

5. Select the correct statement regarding the difference between the FM modulated signal waveform and the AM modulated signal waveform. Compare the AM model and FM model

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. This is because m(t) does not modulate the amplitude of the carrier wave when using FM techniques.

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(2fmt)

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.

Explanation / Answer

1. Option (b) is correct

the cosine function has the maximum value = 5 when t=0 and minimum= -5 when t = pi or in this case .005 that is

its not a sine wave as sine waves are 0 when t=0

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