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.
AM - Amplitude Modulation FM - Frequency Modulation
Normal frequency range for amplitude modulation is 550kHz to 1610kHz
am is amplitude modulation, fm, frequency modulation
because noise usually changes the amplitude not frequency.
Frequency modulation have some advantages over amplitude modulation, FM is not sensitive to the amplitude noise, and have high efficient use of transmitted power
Amplitude Modulation (AM) Frequency Modulation (FM)
In frequency modulation (FM) the amplitude does not remain constant. Instead, the amplitude varies according to the modulation index and the frequency of the modulating signal. This is in contrast to amplitude modulation (AM), where the amplitude of the carrier signal is modulated while the frequency remains constant.
amplitude modulation
amplitude modulation & frequency modulation
amplitude modulation is where we modulate our signal with a carrier signal amplitude changes but frequency remains constant in amplitude modulation
AM = Amplitude Modulation. FM = Frequency Modulation
Frequency modulation Phase modulation