Quadriphase differential demodulator

Details Quadriphase differential demodulator Quadriphase differential demodulator

H - Electricity

03

D

329/3

H03D 3/00 (2006.01) H04L 27/22 (2006.01) H04L 27/227 (2006.01) H04L 27/18 (2006.01)

Patent

CA 1179744

QUADRIPHASE DIFFERENTIAL DEMODULATOR Abstract of the Disclosure A method and apparatus for synchronizing a digital data demodulator to a received phase modulation carrier signal in which the carrier signal is phase shifted during each modulation period of the carrier to represent one of four pairs of binary bits or dibits. A first dibit clock is adjusted to the phase of a reference dibit clock whose output is used to synchronize the demodulator in establishing the location of the modula- tion period of the incoming carrier. In order to over- come errors found in the decoding of the carrier signal, the adjustment of the dibit clock is suppressed when the dibits 00 and 10 are being decoded. With this con- struction, it was found that the dibit clock may run out of synchronization if long strings of zero characters (dibits 00) are received. In order to solve this problem, a second dibit clock is employed which is ad- justed on dibits 00. After a predetermined number of continuous 00 dibits have been decoded, the suppression of the adjustment to the first dibit clock is removed and the phase corrections applied to the second dibit clock are applied to the first dibit clock.

391852

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