Single sideband modulation

Details Single sideband modulation Single sideband modulation

1977-10-03

1981-11-10

Orsino, Jr., Joseph A.

Telecommunications

Transmitter

Amplitude modulation

332 44, 455 47, H04B 168

Patent

active

043002374

ABSTRACT:
A system for single sideband modulation, and a method implemented by the system. The system includes a double sideband, suppressed carrier modulator and a phase locked loop circuit receiving the output of the modulator and tuned to lock to one of the sidebands of the modulator output. The phase locked loop circuit produces an output having a constant amplitude, but otherwise tracking the signal contained in the one sideband. The output of the phase locked loop is processed by an amplifier having a controllable gain. Open and closed loop circuits are provided for deriving the amplitude of the signal contained in the one sideband. The latter amplitude is imparted to the output of the phase locked loop by using the signal amplitude to control the gain of the amplifier.

REFERENCES:
patent: 2705775 (1955-04-01), Crosby
patent: 2761105 (1956-08-01), Crosby
patent: 2900459 (1959-08-01), Olive
patent: 2989707 (1961-06-01), Kahn
patent: 3172046 (1965-03-01), Paufve et al.
patent: 3460041 (1969-08-01), Orwin et al.
patent: 3500250 (1970-03-01), Frerking
patent: 3644831 (1972-02-01), Latker et al.
patent: 3831094 (1974-08-01), Stover
patent: 4131850 (1978-12-01), Wilcox
patent: 4217661 (1980-08-01), Kahn

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