What is Amplitude Modulation?
Amplitude modulation is a type of modulation where the amplitude of the carrier signal is varied in accordance with the information bearing signal.
The envelope, or boundary, of the amplitude modulated signal embeds the information bearing signal.
The total power of the transmitted signal varies with the modulating signal, whereas the carrier power remains constant.
A nonlinear device is used to combine the carrier and the modulating signal to generate an amplitude modulated signal. The output of the nonlinear device consists of discrete upper and lower sidebands.
The output of a nonlinear device does not vary in direct proportion with the input.
Amplitude Modulation is abbreviated AM.
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