Pulse or digital communications – Transmitters
Patent
1994-07-15
1995-09-12
Chin, Stephen
Pulse or digital communications
Transmitters
455108, 375271, 329350, 329347, 332149, 332159, H04L 2704, H04L 2712, H04L 2720
Patent
active
054504449
ABSTRACT:
A digital AM transmitter according to the invention converts a audio signal to a digital audio signal of a plurality of bits by an A/D converter, outputs a logical code signal of "1" from each of those output terminals of a code unit, whose number corresponds to the digital value of the digital audio signal, selectively generates driving signals from those output terminals of a code shifter which are equal in number to the logical code signals of "1" from the code unit, while changing the driving-signal-generating output terminals of the code shifter from one to another (or some to others) with the lapse of time, selectively guiding, with the use of carrier wave switches, those portions of a carrier wave signal which have been divided by a carrier wave divider, to power amplifiers in accordance with driving signals generated from the code shifter, amplifies the guided portions of the carrier wave signal by power amplifiers, combined the amplified portions of the carrier wave signal by a combiner, and passes the combined signal through a band filter, thereby generating an amplitude modulation wave.
REFERENCES:
patent: 4580111 (1986-04-01), Swanson
patent: 4675619 (1987-06-01), Uchibori et al.
patent: 4804931 (1989-02-01), Holick
International Broadcasting Convention, Jul. 1992, T. Yamaguchi, et al., "Development of High Power Medium-Wave Radio Transmitter With SIT", pp. 29-33.
Miki Nobuyuki
Yura Haruhiko
Chin Stephen
Kabushiki Kaisha Toshiba
Webster Bryan
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