Noun
FSK (uncountable)
Initialism of frequency-shift keying.
2. In a facsimile transmitter, a device that changes the signal modulation from amplitude modulation (AM) to frequency-shift keying (FSK). Source: Internet
DTMF tones are used in some caller ID systems to transfer the caller ID information, but in the United States only Bell 202 modulated FSK signaling is used to transfer the data. Source: Internet
Data is transmitted by altering the transmitter output frequency between two distinct frequencies (in the case of FSK modulation, other alternates exist). Source: Internet
Rodengen, p. 91. AMD had some success in the mid-1980s with the AMD7910 and AMD7911 "World Chip" FSK modem, one of the first multi-standard devices that covered both Bell and CCITT tones at up to 1200 baud half duplex or 300/300 full duplex. Source: Internet
This tuning sequence is only useful when ITA2 is used with two-tone FSK modulation, such as is commonly seen in Radioteletype (RTTY) usage. Source: Internet
In practice, many FSK transmitters use only a single oscillator, and the process of switching to a different frequency at the beginning of each symbol period preserves the phase. Source: Internet