four-phase modulation

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four-phase modulation [¦fȯr ¦fāz ‚mäj·ə′lā·shən]

(communications)

Modulation in which data are encoded on a carrier frequency as a succession of phase shifts that will be 45, 135, 225, or 315°; each phase shift contains 2 bits of information called dibits, as follows: 225° represents 00, 315° is 01, 45° is 11, and 135° is 10.

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