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frequency-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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frequency-shift keying

communications
Also known as: FSK
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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.

Frequency-shift keying (FSK) is a digital modulation technique used in telecommunications to transmit data. It works by varying the frequency of a carrier wave to represent binary information. In its simplest form, one frequency is used to transmit a digital '1', and a different frequency transmits a digital '0'. This method was utilized in early modems, such as the Bell 103 voiceband modem, to send data over telephone lines at speeds up to 300 bits per second. FSK is a type of digital modulation, where analog carrier waves are modified to reflect the binary nature of digital signals.12

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

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