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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Phase Modulation is analog signal (carrier) transformation type when the signal changing parameter is its phase.
Maximum modulated signal phase deviation to the average value is called phase deviation able to be set in angular units (degree, radian)
According to its specifications phase modulation is similar to frequency modulation. In case of sinusoidal modulating (information) signal the frequency and phase modulation results are coincided. In analog technology phase modulation use is more rare than frequency modulation due to its requirement for more difficult transformation at receive.
The example of phase modulation is shown in the animated picture below: