D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of measurement equipment. We are using such tools as animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.
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Amplitude Modulation is the simplest and popular changing way of data carrier parameters. Amplitude modulation means oscillation of harmonic amplitude under the variation law of transferred information signal. Amplitude modulation is used in RF technology for data transfer at broadcasting distance, acoustic location and other. For instance RF sound oscillations turn to low frequency power signal (modulating signal) changing (modulates) high frequency (carrier frequency) amplitude signal. The modulated radio signal amplitude changes in accordance with the sound signal force.
The main amplitude modulation (M) characteristic is amplitude modulation coefficient or modulation depth – amplitude max. and min. difference to their sum ratio expressed in percentages: M = (Amax - Amin)/(Amax + Amin)