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phase-shift keying
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Diagram comparing three digital signal modulation methods. It shows a binary digital signal and carrier wave, then illustrates amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK) by how each alters the analog wave to encode binary data.
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phase-shift keying

communications
Also known as: PSK
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Diagram comparing three digital signal modulation methods. It shows a binary digital signal and carrier wave, then illustrates amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK) by how each alters the analog wave to encode binary data.
digital signal modulation A digital signal, representing the binary digits 0 and 1 by a series of on and off amplitudes, is impressed onto an analog carrier wave of constant amplitude and frequency. In amplitude-shift keying (ASK), the modulated wave represents the series of bits by shifting abruptly between high and low amplitude. In frequency-shift keying (FSK), the bit stream is represented by shifts between two frequencies. In phase-shift keying (PSK), amplitude and frequency remain constant, and the bit stream is represented by shifts in the phase of the modulated signal.

Phase-shift keying (PSK) is a digital modulation technique used in telecommunications. It involves altering the phase of a carrier wave to represent binary data. In its simplest form, a 0 is represented by a fixed phase, and a 1 is represented by a 180° phase shift, essentially inverting the carrier wave's polarity. This method was utilized in modems, such as the Bell 212, to transmit data at speeds up to 1,200 bits per second over telephone lines. PSK is one of several digital modulation methods, alongside amplitude-shift keying (ASK) and frequency-shift keying (FSK), that encode digital information onto an analog carrier wave.12

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2 Britannica Sources
  1. telecommunication - Phase-shift keying
  2. telecommunication - Frequency-shift keying

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