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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Mar 2008 10:48:21 IST
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Can any 1 tell me d ans to ques no. 15.6 of communication ????? plz give ur explanations.............
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5 Mar 2008 11:55:06 IST
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well i dont know the first part.....but i know second part
modulation index is the ratio of amplitudes of message signal and carrier wave..........from the graph the amplitude of message signal is 1 and that of carrier wave is given as 2.....modulation index == 1/2.........
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5 Mar 2008 13:06:00 IST
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i actually wanted d 1st part.............
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5 Mar 2008 13:45:16 IST
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i know it bt i'm not able to load the pic......
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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5 Mar 2008 13:57:06 IST
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for fig.see the book it is given there..
for equaation of the graph....
as clear from graph of modulating signal.....
y=1 for x belongs to (k ,k+1/2)
y=-1 for x belongs to (k +1/2,k+1)
k=0,1,2.....
therefofre the equation of modulated wave will be.............
(1+2)sin(8*pi*t) for x belongs to (k ,k+1/2)
(-1+2)sin(8*pi*t) for x belongs to (k +1/2,k+1)
also see that the carrier wave is periodic with period 1/4
(period of carrier wave=2pi/8pi=1/4)
hope it helps...
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