frequency shift keying (Modulation) (FSK)

Frequency Shift Keying (FSK) is a frequency modulation(FM) with two frequencies. One frequency represents the digital "one", the other the digital "zero". In addition to frequency shift keying with two frequencies, as used in the two-tone method, for example, there is also multi-frequency shift keying, Multiple Frequency Shift Keying(MFSK), which works with multiple frequencies. Classic frequency shift keying can work with multiple frequencies and, as with FSK-4, assign dibits 00, 01, 10, and 11 to each individual frequency. Frequency shift keying can be implemented by two or more oscillators with different frequencies, which are switched on or off alternately, depending on the digital information to be transmitted. Since the phase positions of the individual oscillators are always different at the moment of switching, one can alternatively work with only one oscillator whose frequency is changed abruptly and whose phase position remains continuous. This keying method with continuous phase is called Continuous Phase Frequency Shift Keying(CPFSK). Frequency shift keying In addition to the frequency deviation, another parameter for frequency shift keying is the modulation index. This indicates the ratio of the total deviation to the data rate. If the modulation index falls below a value of 0.5, this is referred to as MSK modulation, Minimum Shift Keying (MSK). Frequency shift keying originates from telegraphy and is used in fax transmission and modem technology, while multiple frequency shift keying is used in WLANs, in HomeRF, in DECT, and in amateur radio and

Englisch:	frequency shift keying (Modulation) - FSK
Updated at:	29.09.2018
#Words:	238
Links:	frequency modulation (FM), fault management (FM), digital, indium (In), frequency shift
Translations:	DE
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