Digital differential phase shift keyed modulator

Details Digital differential phase shift keyed modulator Digital differential phase shift keyed modulator

1975-10-03

1977-02-15

Safourek, Benedict V.

Telegraphy

Systems

Alternating or pulsating current

325163, H04L 2718

Patent

active

040083730

ABSTRACT:
A digital control circuit means responsive to a timing signal and a phase shift control signal accepts digital dibits of data and generates a digital control output signal. A digital phase shifter coupled to the control circuit and responsive to a timing signal generates a main and a secondary channel digital output signal alternately at a first and a second output terminal during successive dibit intervals. The main channel digital output signal is phase shifted a predetermined amount with respect to a main channel digital output signal generated during a preceding dibit interval in response to said digital control output signal. A multiplexer coupled to the first and second output terminals of the phase shifter transmits the main channel digital output signal on a third output terminal and the secondary channel digital output signal on a fourth output terminal. A digital number generator coupled to the third and fourth output terminals and responsive to a timing signal generates a series of digital output signals representative of a predetermined analog magnitude. A digital to analog converter converts the digital output signals from the digital number generator into a differential phase shift keyed analog output signal.

REFERENCES:
patent: 3611143 (1971-10-01), Van Gerwen
patent: 3818135 (1974-06-01), Tannhauser
patent: 3891959 (1975-06-01), Tsuji et al.
patent: 3924186 (1975-12-01), Gordy et al.
patent: 3935386 (1976-01-01), Glasson et al.

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