What is frequency modulation?
frequency modulation stands for FM (on your radio).
"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.
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
Frequency modulation, as the name suggests, modulates the carrier by changing the frequency of the signal emitted. Pulse width modulation, changes the on-time of a square wave, but leaves the frequency of the carrier wave unchanged. So, in frequency modulation, the frequency will vary between, say, 80kHz and 120kHz with a constant power level, but in pulse width modulation, the frequency will stay at 100kHz, but the on-time (the length of each pulse) will vary…
FM stands for frequency modulation. The definition is: when the frequency of the carrier wave is changed in accordance with the intensity of the signal, it is called frequency modulation. In frequency modulation, only the frequency of the carrier wave is changed in accordance with the signal. However, the amplitude of the carrier wave remains unchanged.
Amplitude modulation is where a constant carrier is modulated by the signal, so that the envelope of the carrier represents the signal. Frequency modulation is where a constant carrier is modulated by the signal, so that the frequency of the carrier represents the signal. Phase modulation is where a constant carrier is modulated by the signal, so that the phase angle of the carrier represents the carrier.
Frequency modulation waves have higher frequencies and more energy than amplitude modulation waves. They pass through the ionosphere instead of being reflected back to Earth. Thus, frequency modulation waves do not travel as far as amplitude modulation waves. So, if you go on a long car trip with an FM radio station tuned in, you may quickly lose reception of the station. But frequency modulation waves are usually received clearly and produce better sound quality…
The carrier wave of an a.m. transmission is of fixed frequency, and, until modulation is applied, is of fixed amplitude too. When modulation is applied, the amplitude (the strength) of the carrier varies in direct proportion to the amplitude of the modulation, and at the same rate as the frequency of modulation. The amplitude of an f.m. transmission's carrier is fixed, and, until modulation is applied, so is its frequency. When modulation is applied, the…