FACTOID #151: The five countries with the highest coffee consumption are also the five countries whose citizens trust one another the most. Coincidence? Probably.
Frequency-shift keying (FSK) is frequency modulation in which the modulating signal shifts the output frequency between predetermined values.
Note 1: Usually, the instantaneous frequency is shifted between two discrete values termed the "mark frequency" and "space frequency". This is a noncoherent form of FSK.
Note 2: Coherent forms of FSK exist in which there is no phase discontinuity in the output signal. Synonymsfrequency-shift modulation, frequency-shift signaling.
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