Amplitude- and periodic phase-modulation transmission system

Details Amplitude- and periodic phase-modulation transmission system Amplitude- and periodic phase-modulation transmission system

1975-07-16

1979-09-04

Caldwell, Sr., John W.

Telegraphy

Systems

Alternating or pulsating current

178 66R, 332 17, 332 41, H04L 2724

Patent

active

041669231

ABSTRACT:
A carrier is amplitude modulated in an amplitude modulator by a train of unipolar signals which alternately assume a definite voltage level and an arbitrary amplitude of one polarity. Either the carrier before it is modulated or the modulated carrier is phase modulated by the train of unipolar signals. The phase modulation takes place cyclically in that modulated carrier assumes one of predetermined N discrete phases for each occurrence of the unipolar signals. On the receiving side, the received signal is subjected to an envelope detection to extract envelope information.

REFERENCES:
patent: 3341776 (1967-09-01), Doelz et al.
patent: 3412206 (1968-11-01), Bizet et al.
patent: 3486117 (1969-12-01), Groves et al.
patent: 3497618 (1970-02-01), Thayer
patent: 3524023 (1970-08-01), Whang
patent: 3564412 (1971-02-01), Whang et al.
patent: 3619503 (1971-11-01), Ragsdale
patent: 3643023 (1972-02-01), Ragsdale et al.
patent: 3706945 (1972-12-01), Yanagidaira et al.
patent: 3715474 (1973-02-01), Calfee et al.
patent: 3943285 (1976-03-01), Ragsdale et al.

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