Differential tri-phase shift keyed modulation

Claim 1

In a differential tri-phased shift keyed modulation system a phase comparator for the detection of data transmission shift keyed modulation comprising a signal receiving source, a center tapped delay line having a total storage duration equal to the system transmission signalling rate, a first phase shifter, said delay line and said first phase shifter being fed from said signal receiving source, a first phase demodulator being fed simultaneously by the center tap of said delay line and by said first phase shifter wherein said first phase demodulator develops a clock synchronizing signal at the system data rate, a second phase shifter driven by said signal receiving source, a second phase demodulator receiving the outputs of said delay line and said second phase shifter for the detection of the received signal data content, a third phase shifter driven by said signal receiving source, and a third demodulator, said third phase demodulator being driven by said delay line and said third phase shifter and adjusted to detect pauses occuring in the shifting of transmission signal phase.