| 1. | They send a bit as one of two tones using frequency-shift keying.
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| 2. | Data is transmitted using 4-level frequency-shift keying ( FSK ) modulation.
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| 3. | AFSK differs from regular frequency-shift keying in performing the modulation at baseband frequencies.
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| 4. | Signal encoding uses Phase-shift keying ( QPSK or GMSK ).
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| 5. | Originally, Gaussian frequency-shift keying ( GFSK ) modulation was the only modulation scheme available.
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| 6. | In the 1, 200 bit / s and faster systems, phase-shift keying was used.
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| 7. | The unit can also generate and sync to frequency-shift keying signals from a tape recorder.
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| 8. | Instead, a form of frequency shift keying was employed.
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| 9. | X-COM is the holder of multiple technical patents including "'Time-Shift Keying "'and other related technologies.
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| 10. | DP-QPSK refers to Dual polarization-quadrature phase shift keying.
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