Method and apparatus for transmission of telephone calls to a po

Details Method and apparatus for transmission of telephone calls to a po Method and apparatus for transmission of telephone calls to a po

1983-08-11

1986-12-09

Lev, Robert G.

Telephonic communications

Emergency or alarm communications

With automatic dialing or transmission of recorded audio...

379 60, 455 33, H04M 1100

Patent

active

046281525

ABSTRACT:
A method and an equipment for wireless transmission of telephone calls between a stationary unit (1) connected to a telephone set (3) at a short distance from the stationary unit provides that all pairs of units (1, 3) have access to a plurality of common duplex radio speech channels for transmission of calls, and to a common radio signalling channel for transmission of signals referring to connection and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened to before a call, and a channel selected which is idle with respect to calls. The selection of an idle channel takes place automatically with the use of radio receivers (12, 25), channel selectors (15, 28) and circuits (16, 29) incorporated in both units.

REFERENCES:
patent: 3943444 (1976-03-01), Lundberg
patent: 4228319 (1980-10-01), De Jager et al.
patent: 4467141 (1984-08-01), Resch et al.

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