Technique for simultaneous communications of analog frequency-mo

Details Technique for simultaneous communications of analog frequency-mo Technique for simultaneous communications of analog frequency-mo

1996-08-22

2000-11-07

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

H04L 2549

Patent

active

061447056

ABSTRACT:
In a system for simulcasting digitally modulated and analog FM signals over the same FM frequency band, the effect of the analog FM signal on the digitally modulated signal in the simulcast is calculated and canceled from the latter signal before its transmission. As a result, the digital transmission is free from interference from the analog FM signal. Moreover, the digital transmission is designed in such a manner that the interference caused thereby to the analog FM signal is kept at a minimal level.

REFERENCES:
patent: 4379947 (1983-04-01), Warner
patent: 5301363 (1994-04-01), Hinderks
patent: 5757854 (1998-05-01), Hunsinger et al.
"FM-2 System Description", USA Digital Radio, 1990-1995.
N. Jayant, "The AT&T DAR System Update", NAB 1994 Broadcasting Engineering Conference Proceedings, pp. 389-398.
J. Bingham, "AT&T/AMATI DAR System: An Update", NAB 1994 Broadcast Engineering Conference Proceedings, pp. 399-403.

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