Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1993-06-01
1995-09-26
Tse, Young
Pulse or digital communications
Transmitters
Antinoise or distortion
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.
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Hirano, Shinya, "Digitally Implemented Medium Frequency Transmitter and Its Application", Hoso Gijutsu, Apr. 1991, pp. 119-125.
Hayeiwa Kazuhisa
Kojima Yutaka
Minami Michitosi
Miyazaki Tetsuroh
Mizokami Tohru
Japan Radio Co. Ltd.
Nippon Hoso Kyokai
Tse Young
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