Amplitude Modulation

Where audio signals increase and decrease the amplitude of the "carrier wave".

  • The carrier wave contains most of the transmitted power, but no signal information.
  • The envelope is the information and so an envelope detector is a sufficient demodulator.

Modulation Factor

In an amplitude-modulated wave, the ratio (usually expressed in percent) of the peak variation of the envelope from its reference value, to the reference value.

See also: Base Band, Carrier, Carrier Frequency, Frequency Modulation, Modulation.

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Subjects: Electronics