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** Audio frequency-shift keying ( AFSK )
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** and frequency-shift
** Continuous-phase frequency-shift keying ( CPFSK )
** In an FSK ( frequency-shift keying ) transmitter, which transmits digital data, the frequency of the carrier is shifted between two frequencies which represent the two binary digits, 0 and 1.
** and keying
** Multi-frequency shift keying ( M-ary FSK or MFSK )
** Minimum-shift keying ( MSK )
** Gaussian minimum-shift keying ( GMSK )
Audio and frequency-shift
Audio frequency-shift keying ( AFSK ) is a modulation technique by which digital data is represented by changes in the frequency ( pitch ) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone.
frequency-shift and keying
Originally Gaussian frequency-shift keying ( GFSK ) modulation was the only modulation scheme available ; subsequently, since the introduction of Bluetooth 2. 0 + EDR, π / 4-DQPSK and 8DPSK modulation may also be used between compatible devices.
Digital data can be sent by shifting the carrier's frequency among a range of settings, a technique known as frequency-shift keying ( FSK ).
* Mark frequency, extreme discrete value of frequency-shift keying
* In the case of FSK ( frequency-shift keying ), a finite number of frequencies are used.
Indeed, MSK is a particular case of the sub-family of CPM known as continuous-phase frequency-shift keying ( CPFSK ) which is defined by a rectangular frequency pulse ( i. e. a linearly increasing phase pulse ) of one symbol-time duration ( total response signaling ).
Some transmitters are capable of direct frequency-shift keying ( FSK ) as they can directly accept the digital signal and change their transmitting frequency according to the mark or space input state.
For digital modulation schemes it has been shown that for properly implemented on-off keying / amplitude-shift keying systems, co-channel rejection can be better than for frequency-shift keying systems.
In a facsimile receiver, a device that changes the signal modulation from frequency-shift keying ( FSK ) to amplitude modulation ( AM ).
In a facsimile transmitter, a device that changes the signal modulation from amplitude modulation ( AM ) to frequency-shift keying ( FSK ).
Minimum frequency-shift keying or minimum-shift keying ( MSK ) is a particular spectrally efficient form of coherent FSK.
AFSK differs from regular frequency-shift keying in performing the modulation at baseband frequencies.
Most early telephone-line modems used audio frequency-shift keying to send and receive data at rates up to about 1200 bits per second.
* Continuous-phase frequency-shift keying ( CPFSK )
* Multiple frequency-shift keying ( MFSK )
Radioteletype, fax, digital, slow-scan television and other systems use forms of frequency-shift keying or audio subcarriers on a shortwave carrier.
* Frequency modulation ( FM ), with its digital correspondence frequency-shift keying ( FSK ).
The 1s and 0s from the serial port are converted to audio tones using audio frequency-shift keying ( AFSK ).
# REDIRECT frequency-shift keying
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