Carrier wave reproducer device for use in the reception of a mul

Details Carrier wave reproducer device for use in the reception of a mul Carrier wave reproducer device for use in the reception of a mul

1975-09-25

1976-10-05

Griffin, Robert L.

Telegraphy

Systems

Printing

178 88, 178 695R, H04B 116

Patent

active

039847772

ABSTRACT:
A carrier wave reproducer device for use in the reception of a multi-phase digital phase-modulated waves for rapidly extracting the carrier wave without the generation of frequencies higher than the carrier frequency is disclosed. In its simplest embodiment, the device employs a delay detector and a cumulative adder circuit to derive a demodulated signal and a modulator for inversely modulating the input multi-phase digital phase-modulated wave with said demodulated signal. The reference carrier wave is then obtained from the output of the modulator. The same principle is used in alternative embodiments used in the reception of a burst form of signal transmitted with a preamble word having a specific pattern. These alternative embodiments take advantage of the preamble word generally included in a burst form of signal by additionally employing a demodulator for demodulating the input multi-phase digital phase-modulated wave through synchronized detection by making use of the reference carrier wave obtained from the modulator. In addition, a switching circuit is employed to supply the modulator with the demodulated output from the adder circuit at the beginning of reception of the phase-modulated wave, but after the reference carrier wave has been established, to supply the modulator with the output of the demodulator.

REFERENCES:
patent: 3737578 (1973-06-01), Matsuo
patent: 3769587 (1973-10-01), Matsuo et al.
patent: 3815034 (1974-06-01), Kato
patent: 3826990 (1974-07-01), Pera

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