A change in the level of a signal. For example, if a Voltage Controlled Amplifier (VCA) were being modulated by a Low Frequency Oscillator (LFO), the result would be a periodic increase and decrease in the audio level of the signal. In musical terms this would be referred to as Tremolo. The abbreviation of Amplitude Modulation is AM.
(AM) One of three basic ways to add information to a sine wave signal; the magnitude of the sine wave, or carrier, is modified in accordance with the information to be transmitted.
as in the AM broadcast band