Narrowband phase modulation communication system which eliminate

Details Narrowband phase modulation communication system which eliminate Narrowband phase modulation communication system which eliminate

1975-09-12

1977-10-11

Griffin, Robert L.

325 30, 325 65, 325145, 325346, H04B 162, H02B 100, H04B 110

Patent

active

040538346

ABSTRACT:
A narrowband phase modulation communication system is disclosed which eliminates thresholding. At the transmitter, quadrature modulation which produces very large maximum phase deviation is employed in conjunction with a constant amplitude limiter. The constant amplitude resultant contains the carrier and voice signal components in quadrature and is transmitted, at a suitable frequency, in this form. At the receiver, a narrowband phase locked loop is employed for demodulation. This demodulating loop coherently tracks the carrier component and eliminates the thresholding problem normally encountered. In a modification, the carrier component is used to transmit data either alone or in combination with the voice signal.

REFERENCES:
patent: RE21660 (1940-12-01), Armstrong
patent: 2130172 (1938-09-01), Armstrong
patent: 3638125 (1972-01-01), Goell
patent: 3651429 (1972-03-01), Ruthroff
patent: 3792357 (1974-02-01), Hekimian et al.
patent: 3828138 (1974-08-01), Fletcher et al.
patent: 3924186 (1975-12-01), Gordy et al.

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