Channel selection in a multichannel access radio communication s

Details Channel selection in a multichannel access radio communication s Channel selection in a multichannel access radio communication s

1986-05-30

1988-08-30

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 61, 379 58, 455 77, H04Q 704

Patent

active

047682205

ABSTRACT:
In a channel selecting device which is for use in a station of a multichannel access radio communication system comprising that station and a plurality of other stations, a control channel, and a predetermined number of speech channels and which includes a channel selector (11, 12, and 14) for selecting one of the speech channels as a selected channel on starting communication with a specific station of the system, a channel detecting arrangement (11, 12, and 14) is coupled to the control channel to detect channel codes of busy channels which are rendered busy among the speech channels by at least two of the other stations. The channel detecting arrangement is operable while the first-mentioned station is in an idle state. A memory unit (30) is coupled to the channel detecting arrangement and stores the channel codes of the busy channels. The channel selector is coupled to the memory unit to select the selected channel from idle channels which are other than the busy channels. Preferably, an erasing arrangement (11, 12, and 14) erases each of the channel codes from the memory unit upon lapse of a predetermined time interval after storage of that channel code in the memory unit. The erasing arrangement may erase all channel codes from the memory unit when a manually operable switch (23) is operated after all channel codes are memorized in the memory unit.

REFERENCES:
patent: 4555805 (1985-11-01), Talbot
patent: 4633509 (1986-12-01), Scheinert
patent: 4649567 (1987-03-01), Childress
patent: 4654879 (1987-03-01), Goldman et al.
patent: 4658416 (1987-04-01), Tanaka
patent: 4672657 (1987-06-01), Dershowitz

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