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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The main modulation function is signal transformation or transfer from low-frequency range to higher for further transfer through radio or cable carrier line. The data transferred is encoded in the control (information) signal, while the high-frequency oscillation is data carrier. Thus modulation represents the carrier transformation process with the known parameters in compliance with the rule set by the control (information) signal. The carrier can be represented by different signal forms (rectangle, triangle etc.), but the harmonic oscillations are the most frequently used (sinusoidal form). Depending on the oscillation parameter changed there are three main modulation types: amplitude, frequency and phase.