AM-PSK system for broadcasting a composite analog and digital si

Details AM-PSK system for broadcasting a composite analog and digital si AM-PSK system for broadcasting a composite analog and digital si

1996-09-20

1997-09-30

Chin, Wellington

Pulse or digital communications

Systems using alternating or pulsating current

Amplitude modulation

375300, 375332, 375340, 370297, 329348, 332151, 455102, H04L 2734, H04L 2736, H04L 2738

Patent

active

056732929

ABSTRACT:
A radio-frequency broadcasting system and method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel wherein the system includes: a transmitter for providing, and broadcasting, a composite signal containing an adaptively-modulated phase-shift-keyed digital signal with analog programming material modulated thereon; and a receiver for detecting the composite signal, extracting the analog audio signal and digital audio, or data, therefrom, and playing back the received audio programming. The adaptively-modulated phase-shift-keyed digital signal is responsive to the transmitted signal, dynamically increasing the digital data transmission rate as the transmitted signal power increases. Symbol states are generally arranged around concentric arcs, and adjacent symbol states are generally equidistant.

REFERENCES:
patent: 4029903 (1977-06-01), Tamburelli
patent: 4084137 (1978-04-01), Welti
patent: 4170764 (1979-10-01), Salz et al.
patent: 4247944 (1981-01-01), Sifford
patent: 4464767 (1984-08-01), Bremer
patent: 4675619 (1987-06-01), Uchibori et al.
patent: 4688255 (1987-08-01), Kahn
patent: 4751478 (1988-06-01), Yoshida
patent: 5084903 (1992-01-01), McNamara et al.
patent: 5283780 (1994-02-01), Schuchman et al.
patent: 5333155 (1994-07-01), Dambacher

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