Simulcast transmission system with selective call tones

Details Simulcast transmission system with selective call tones Simulcast transmission system with selective call tones

1994-02-17

1995-06-06

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 561, 455 676, H04B 714

Patent

active

054230586

ABSTRACT:
A simulcast radio transmission system (250) transmits message signals (318) including selective call tones, originating from a message source (202), to a geographical area (115). The simulcast system includes a controller (204) coupled between the message source (202) and a plurality of remote transmitter sites (208, 210) for exchanging message signals (318) including selective call tones therebetween. Connecting the controller (204) to the plurality of transmitter sites (208, 210) are a plurality of interconnect links (224, 226), each having bounded propagation time delay characteristics. The simulcast system (250) employs phase numbers associated with the starting phase of the selective call tones to allow accurate reconstruction of the selective call tones. The controller (204) then combines (508) the message signals (318) with the launch time and the phase number to establish a message bundle and sends the message bundle to at least one of the plurality of transmitters (208, 210), via at least one of the plurality of interconnect links (224, 226).

REFERENCES:
patent: 4188582 (1980-02-01), Cannalte et al.
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patent: 4696052 (1987-09-01), Breeden
patent: 4850032 (1989-07-01), Freeburg
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patent: 5077759 (1991-12-01), Nakahara
patent: 5117424 (1992-05-01), Cohen et al.
patent: 5127101 (1992-06-01), Rose, Jr.
patent: 5172396 (1992-12-01), Rose, Jr. et al.

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