Amplitude modulation method and broadcasting apparatus for carry

Pulse or digital communications – Transmitters – Antinoise or distortion

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375296, 375300, 455108, 341100, 332159, H03C 100

Patent

active

054540135

ABSTRACT:
An amplitude modulation system. An input analog signal indicating audio, etc., is converted into a digital form and the low-order bits of the resultant digital signal are converted into analog form. The resultant analog signal is used to control a gain of an analog controlled amplifier. On the other hand, a plurality of digitally controlled amplifiers are selectively turned on/off in response to the value of the high-order bits of the digital signal. Carrier amplified by the analog controlled amplifier are combined with carriers amplified by the plurality of digitally controlled amplifiers. Comparatively rough amplitude constituents are provided by outputs of the plurality of digitally controlled amplifiers and comparatively fine amplitude constituents are provided by output of the analog controlled amplifier.

REFERENCES:
patent: 3877023 (1975-04-01), Spicer et al.
patent: 4403197 (1983-09-01), Swanson
patent: 4581725 (1986-04-01), Pilarcik, Jr.
patent: 4860010 (1989-08-01), Iwamatsu
patent: 5124979 (1992-06-01), Matui
patent: 5289496 (1994-02-01), Nakagawa et al.
Hirano, Shinya, "Digitally Implemented Medium Frequency Transmitter and Its Application", Hoso Gijutsu, Apr. 1991, pp. 119-125.

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