Pulsed bi-phase digital modulator system

Pulse or digital communications – Repeaters – Testing

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375 67, 329104, 332 10, 360 42, H04L 2720

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active

046566473

ABSTRACT:
A short pulse of a small leading phase angle deviation of the carrier frequency at the start of a clock period and a short pulse of a small lagging phase angle deviation of the carrier frequency at the middle of a clock period encodes a digital one, while a short pulse of a lagging phase angle deviation of the carrier frequency at the middle of a clock period encodes a digital zero. Resistances are switched to directly deviate a low level carrier. The digital phase lock loop demodulator has an output digital one pulse derived from the negative pulse response of its phase comparator to the leading phase angle and has coherent clock pulses derived from its positive pulse response to the lagging phase angle at the middle of every bit. Information is contained in the abrupt pulses of phase transitions from an average constant phase carrier frequency. No reference carrier is needed for demodulation. The original modulated carrier and one side band may be eliminated and a single side band transmitted with a consequent relatively narrow frequency spectrum of the signal.

REFERENCES:
patent: 3138665 (1964-06-01), Chasek
patent: 3665474 (1972-05-01), Thayer
patent: 3779321 (1973-12-01), Landwer et al.
patent: 3946337 (1976-03-01), Philips et al.
patent: 4112369 (1978-09-01), Forman et al.

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