Cordless telephone

Details Cordless telephone Cordless telephone

1989-09-06

1990-10-23

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 54, 455 63, 455295, 379 61, H04Q 700, H04Q 900, H04B 1500

Patent

active

049658492

ABSTRACT:
A cordless telephone of multi-channel access (MCA) type has a master station which includes a plurality of sets of transmitting and receiving circuits and communication channels are simultaneously opened between the master station and a plurality of remote stations or handset units. The master station is controlled, as by a microcomputer, so that a receiving circuit in the master station sequentially scans communication channels to produce data indicating a vacant channel and which is to be stored in a memory as vacant channel information, a communication channel indicated to be a vacant channel by the stored information is employed when a communication channel is opened between the master station and the remote stations, when data indicating a vacant communication channel is to be stored in the memory as vacant channel information, it is determined whether or not such vacant communication channel disturbs a control channel or other communication channels by cross modulation, and, when the vacant communication channel is determined to be a channel which causes a cross modulation disturbance, the data indicating such communication channel is inhibited from being stored in the memory.

REFERENCES:
patent: 4128740 (1978-12-01), Graziano
patent: 4242538 (1980-12-01), Ito et al.
patent: 4485486 (1984-11-01), Webb et al.
patent: 4704734 (1987-12-01), Menich et al.
patent: 4741049 (1988-04-01), De Jager et al.
patent: 4747101 (1988-05-01), Akaiwa et al.

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