H - Electricity – 03 – C
Patent
H - Electricity
03
C
328/129, 332/27,
H03C 1/00 (2006.01) H04L 25/497 (2006.01) H04L 27/36 (2006.01) H04L 27/38 (2006.01)
Patent
CA 1071719
ABSTRACT OF THE DISCLOSURE A partial response modulation system can be formed a diff- ential logic circuit which obtains two parallel output signals two parallel input signals, two pre-coding circuits for the partial response conversion of respective two parallel output signals of the differential logic circuit after pre-coding two partial response converters, and a mod- ulator for quadrature amplitude modulation using respective outputs of the two partial response converters. The differential logic circuit, in the case where the code combination of two parallel input signals is not influenced by phase ambiguity of 90° of the regenerated carrier during demodulation at the receiving side, applies said two parallel input signals directly to the pre-coding circuit. The differential logic circuit applies the two parallel input signals to the pre-coding circuit after differential logic processing in the case where the code combination of two parallel input signals is in- fluenced by phase ambiguity of 90° of the regenerated carrier at the time of demodulation in the receiving side.
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