Selective call signal detection circuit for multi-channel access

Details Selective call signal detection circuit for multi-channel access Selective call signal detection circuit for multi-channel access

1984-10-12

1986-06-24

Ng, Jin F.

Telecommunications

Transmitter and receiver at separate stations

455 62, 455166, 455 38, 34082503, 34082552, H04B 700, H04Q 700

Patent

active

045971048

ABSTRACT:
A selective call signal detection circuit comprises a channel free/busy state detection circuit for scanning a plurality of communication channels to determine their respective free/busy states, a present-time channel free/busy state memory circuit for temporarily storing channel free/busy detection signals resulting from the aforementioned scanning of communication channels, a past-time channel free-busy state memory circuit for receiving into storage therein in the subsequent channel scanning cycle the channel free/busy detection signals of the previous scanning cycle formerly stored in the aforementioned present-time channel free/busy state memory circuit, and a comparison circuit for comparing the signals from the aforementioned present-time past-time channel free/busy state memory circuits thereby discriminating between a selective call signal addressed to a given receiving station and selective call signals addressed to other receiving stations. Since this selective call signal detection circuit permits quick discrimination between a channel in the state of normal communication and a channel in the state of selective call, it serves to enhance the efficiency of channel scanning.

REFERENCES:
patent: 3634627 (1972-01-01), Vecentini
patent: 3739102 (1973-06-01), Leonard
patent: 3913017 (1975-10-01), Imaseki
patent: 4166927 (1979-09-01), Hamaoki
patent: 4400585 (1983-08-01), Kaman
patent: 4423413 (1983-12-01), Da Silva

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