Answer the following 3 questions regarding AM, FM, or PM modulation

1) Select the statement that best describes the resultant wave forms from the above picture. a. The AM signal appears to faithfully represent the message m(t). b. The FM index is small, and it is difficult to see FM frequency changes. c. The FM signal sFM(t) amplitude does not change, which is to be expected since carrier amplitude does not represent the message m(t). d. All statements is correct.

2) Select the statement that best describes your observation from the above picture a. The FM modulated carrier signal appears to faithfully represent the message m(t) b. Kvco is much smaller, and as a result the FM Index is very small. Changes in the FM signal are difficult to see. c. Changes in Kvco results in FM signal amplitude changes. d. All of the statements are correct

Question 3.1 3) Select the correct statement regarding the difference from the above picture 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(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.

Figure1 File Edit View nsert Tools Desktop Window Help Clo AM modulation FM modulation 10 10 -5 -5 -10 -10 0.5 1.5 time 0.5 2.5 2.5 time x 10 x 10 combined message and FM signal combined message and AM signal 10 -5 -10 0.5 2.5 1.5 2.5 1.5 time 0.5 x 10 time x 10 Figure1 File Edit View Insert Tools Desktop Window Help AM modulation FM modulation 20 10 10 -10 -20 -10 0.5 1.5 time 0.5 1.5 time 2.5 2.5 x 10 x 10 combined message and FM signal combined message and AM signal 10 20 -5 10 -5 -10 20 0.5 1.5 time 2.5 0.5 1.5 time 2.5 x 10 x 10 Figure 1 File Edit View Insert Tools Desktop Window Help um AM modulation FM modulation an 10 -5 -10 2 time x10 time X x 10 combined message and FM signal combined message and AM signal -5 -10 2 time X time X x 10 mmarn indoW