Electronics Engineering
Waves Vibrations and Oscillations

What is frequency modulation?

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2011-04-29 19:25:17
2011-04-29 19:25:17

frequency modulation stands for FM (on your radio).

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"frequency modulation stands for FM"

No it doesn't. On the contrary, f.m. stands for frequency modulation.

Frequency modulation is the method of impressing information on an r.f. carrier by changing its frequency back and forth in sympathy with the informatiion signal.

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FM means Frequency Modulated.FM stands for modulation on frequency or frequency modulation.


The difference between frequency modulation and phase modulation is that with frequency modulation the angular frequency of the signal is modified while with the phase modulation, the phase angle of the signal is modified.


in frequency modulation, frequency of carrier signal changes. so frequency variations of carrier convey all the information in frequency modulation.



a measure of the degree of frequency modulation expressed numerically for a pure tone modulation as the ratio of the frequency deviation to the frequency of the modulating signal.


Modulation schemes depends on frequency.


Modulation Index is the ratio of the maximum deviation frequency to the frequency of modulation. In other words it is the ratio of the spread in frequency spectrum to the frequency that was used to modulate the carrier. For FM, modulation index is given by the formula mf= df/f where, mf=modulation index for FM df=difference in carrier frequency f=frequency of the signal


Normal frequency range for amplitude modulation is 550kHz to 1610kHz


Amplitude of the (high frequency) Carrier signal is varied with respect to low frequency of message signal is called amplitude modulation. Frequency of the carrier signal is varied with respect to low frequency of message signal is called frequency modulation.


Frequency Modulation and Phase Modulation


Edwin Howard Armstrong is the inventor of modern frequency modulation



phase modulation can be applied instead of frequency modulation as it has almost same advantages to that of frequency modulation.but in case of frequency modulation the clarity is more.it is used in America foe radio communication.


Amplitude Modulation (AM) Frequency Modulation (FM)


mf=(K*Am)/fm where K: is a proprtionality coefficient Am: is amplitude of the message fm=frequency of modulation


Frequency shift keying in digital communication and Frequency modulation in analog communication..........


"Frequency modulation" means that the frequency of a base wave is changed slightly, i.e. increased and decreased, to transmit information.


AM: Amplitude modulation FM: Frequency modulation PM: Phase modulation



AM: Amplitude modulation FM: Frequency modulation PM: Phase modulation



Amplitude Modulation and Frequency Modulation.


am is amplitude modulation, fm, frequency modulation


am is amplitude modulation FM is frequency modulation


AM: amplitude modulation and FM: frequency modulation



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