00:01
So here in this question, firstly, we find the carrier frequency.
00:05
The carrier frequency is the frequency of cosine terms in the carrier signal.
00:10
The carrier frequency, and that is cost 8x2 .10 to the power 6t.
00:20
And the angular frequency, that is omega -c, omega -c is 8 -5 into 10 -rest -to -the -power -6.
00:29
The carrier frequency fc is equal to omega c by two pi and that is 8 pi into 10 to the power 6 upon 2 pi which is 4 into 10 risk to the power 6 hertz then we find the frequency for the modulating signal the modulating signals the frequency of the cosine terms in the modulating signal which is cost 12 pi into 10 to the power 3 t the angular frequency omega am is 12 by into 10 to the power 3.
00:57
So the modulating frequency is omega m by 2 pi, that is 12 into 10 to the power 3 by 2 pi, which is 6 into 10 to the power 3 hertz.
01:10
Then we find the modulating index.
01:14
And the motivating index is given by the ratio of amplitude of the modulating signal to the amplitude of carrier signal...