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What is the bandwidth needed if we modulate the signal using FM modulation?

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the_jackal

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We have an audio signal with bandwidth of 4MHz. What is the bandwidth needed if we modulate the signal using frequency modulation?
 

Re: FM modulation

This operation requires knowing the modulating frequency and the maximum frequency deviation of the transmitted carrier.
Carson’s rule yields: B = 2Bm+2Δf.
Use this example to calculate FM bandwidth:
**broken link removed**

Now my question: what kind of "audio" signal will occupy 4MHz?

Regards,
IanP
 

Re: FM modulation

The megahertz is probably a typo. Anyways the correct answer is 4KHz*10=40KHz
 

FM modulation

hi,
In fact I don't exactly understand what do you want to say, but what I know is that you can modulate your signal by every signal youy want with the condition that your frequency must be greater than the frequency of sampling you used
 

Re: FM modulation

Try the following link:
h**p://www.ee.byu.edu/ee/class/ee444/ComBook/ComBook/node55.html
 

Re: FM modulation

depending upon the modulation index fm signal would take the bandwidth as explained by upper users' comments
 

FM modulation

in fact ,the carson's rule can't give u precise band value. it is different according to ur modulation method.
 

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