Amplitude and frequency modulation system

Details Amplitude and frequency modulation system Amplitude and frequency modulation system

1978-03-06

1979-10-09

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325 30, 325139, 325163, 332 22, 332 41, H03C 500, H04L 2712

Patent

active

041707648

ABSTRACT:
Combined amplitude and frequency-shift-keying (AM-FSK) modulation of a carrier wave by a baseband data signal achieves significant suppression of one of the sidebands to ease the design requirements of filters generally used in the transmission of FSK signals. The significant suppression effect is observed when the ratio of minimum to maximum amplitude of the envelope of the amplitude modulated carrier wave is restrained to be approximately between 0.6 and 0.9.
In one embodiment amplitude modulation is performed by a pair of amplifiers, each having a predetermined gain. In another embodiment, an all digital technique is used to synthesize the AM-FSK signal.

REFERENCES:
patent: 1734038 (1929-11-01), Levy
patent: 2611826 (1952-09-01), Kalfaian
patent: 3054073 (1962-09-01), Powers
patent: 3213368 (1965-10-01), Geluk
patent: 3249896 (1966-05-01), Baker
patent: 3486117 (1969-12-01), Groves et al.
patent: 3619503 (1971-11-01), Ragsdale
patent: 3715474 (1973-02-01), Calfee et al.
patent: 3895316 (1975-07-01), Fein

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