Telegraphy – Systems – Alternating or pulsating current
Patent
1976-06-02
1978-08-22
Murray, Richard
Telegraphy
Systems
Alternating or pulsating current
325 30, H04L 2724
Patent
active
041091019
ABSTRACT:
A novel modulator converts a sequence of N'ary codes representative of an element P of a set (0, 1, 2, . . . , N - 1) into a sequence of 2N-phase carrier pulses, where N = 2.sup.n, n being a positive integer. A phase shift in the carrier signal between each carrier pulse and the next preceding one is selected from P.pi./N and (P + N).pi./N in compliance with a prescribed law of correlation between the N'ary codes in the sequence. Alternatively, the carrier signal is given in each carrier pulse a phase selected in the manner specified. For convenience of resorting to the prescribed correlation law, the N'ary code sequence may be converted into N trains, corresponding to the respective elements P, of three-level signals, 0 and .+-.1. In the train corresponding to a particular element, the three-level signals are successively produced with the prescribed correlation law, such as with resort to a bipolar or duobinary technique. A novel demodulator converts the 2N-phase carrier pulse sequence into the original N'ary code sequence.
REFERENCES:
patent: 3100890 (1963-08-01), Henning
patent: 3485949 (1969-12-01), DeHaas
patent: 3798371 (1974-03-01), Melvin
Murray Richard
Nippon Electric Company Ltd.
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