AM multiplexing broadcast apparatus

Details AM multiplexing broadcast apparatus AM multiplexing broadcast apparatus

1997-10-14

1999-08-24

Hofsass, Jeffery A.

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via frequency channels

370214, 370343, 455102, 455105, H04J 100

Patent

active

059433450

ABSTRACT:
An AM multiplexing broadcast apparatus multiplexes a digital modulated signal independent of an AM modulated signal, in the same frequency band as the AM modulated signal. A sum signal is amplified by a first amplifier. An inverse of the sum signal is obtained by an inverse calculator. A divider divides this inverse signal by a magnification factor of the first amplifier. An output of the divider and a digital modulated signal in the same frequency band as an AM modulated signal are multiplied by a first multiplier. A carrier generated by a carrier generator is phase-modulated by a phase modulator. Outputs of the phase modulator and first multiplier are synthesized and thereafter amplified by a second amplifier. Outputs of the first and second amplifiers are multiplied by a second multiplier and transmitted from an antenna.

REFERENCES:
patent: 4867859 (1989-09-01), Asahi et al.

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