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PSK – phase shift keying
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 shift keying is a signal transform method when the carrying oscillation phase changes abruptly depending on the discrete data messages.
At phase shift keying each digital symbol has its own carrier signal initial phase matching it, the amplitude stays steady. This shift keying type is more difficult in realization but at the same time it’s more noise-resistant comparing to two other shift keying types.
The picture below shows the graphical chart of zeros and unities binary order as well as the relevant phase shift keyed signal chart. Initial phase of 180° matches the binary signal low level, 0° of sinusoidal carrier signal – the high level.
The next picture shows the example of the phase shift keying of sinusoidal carrier signal, two-digit code is an information signal. Initial phase of 0° matches digital code “0”, 180° – code “1”, 90° - code “2”, 270° - code “3”.
Phase shift keying example is shown in the anumated picture below:
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