Hi guys. i am trying to understand how frequency modulation works. Please look at the picture below.
I see the information signal which let us suppose is 4000Hz. ( Let us pretend Elvis is signing at 4000 Hz..)
I see a carrier signal which , we will pretend, is 97.5 MHz. ( Lets pretend it is a radio station in NY.)
Now look at the end result after modulation ( the FM Signal.)
The signal's frequency is almost constantly changing!
My question to you guys is, if the frequency of the FM signal is changing, how can i still hear Elvis at 97.5 MHz? Shouldn't the song be all over the radio dial? Shouldn't the song be at 96MHz for a moment and then at 103 MHz the next moment? I am asking this because looking at the FM signal, the only conclusion that i can make is that the frequency is constantly changing.
But we know that the song is always constantly playing at 97.5MHz. Why is the song not being transmitted all over the dial?
I see the information signal which let us suppose is 4000Hz. ( Let us pretend Elvis is signing at 4000 Hz..)
I see a carrier signal which , we will pretend, is 97.5 MHz. ( Lets pretend it is a radio station in NY.)
Now look at the end result after modulation ( the FM Signal.)
The signal's frequency is almost constantly changing!
My question to you guys is, if the frequency of the FM signal is changing, how can i still hear Elvis at 97.5 MHz? Shouldn't the song be all over the radio dial? Shouldn't the song be at 96MHz for a moment and then at 103 MHz the next moment? I am asking this because looking at the FM signal, the only conclusion that i can make is that the frequency is constantly changing.
But we know that the song is always constantly playing at 97.5MHz. Why is the song not being transmitted all over the dial?