Short for frequency-shift keying
, a modulation
technique used by modems
in which two different frequencies in the carrier signal
are used to represent the binary
states of 0 and 1. Using FSK, a modem converts the binary data from a computer into a binary form in which logic 1 is represented by an analog waveform
at a specific frequency and logic 0 is represented by a wave at a different specific frequency.
Compare with PSK.