Simultaneous voice-call system for cordless telephone

Details Simultaneous voice-call system for cordless telephone Simultaneous voice-call system for cordless telephone

1992-04-29

1994-03-08

Kuntz, Curtis

Telephonic communications

Audio message storage, retrieval, or synthesis

379 58, 379 61, 379 63, 455 341, 455 342, H04M 1100, H04Q 700

Patent

active

052934195

ABSTRACT:
A simultaneous voice-call system for a cordless telephone where communication between a base unit and a plurality of portable units is established through the use of a radio communication channel. The base unit includes a transmitter/receiver which establishes a communication channel between base unit and plurality of portable units. The transmitter/receiver has a control channel and a plurality of talk channels. A portable-unit-identifying number memory stores portable-unit-identifying numbers preassigned to the plurality of portable units. A first simultaneous call controller responsive to a simultaneous call command from a user to establish a talk-channel between the plurality of portable units by transmitting through the control channel portable-unit-identifying numbers stored in the portable-unit-identifying number memory, a vacant-talk-channel number, and a simultaneous call code to the plurality of portable units. The talk-channel is a radio communication channel through which a message is transmitted from the base unit to the plurality of portable units. The simultaneous call code indicates that the message is transmitted to the portable units at the same time. Each of the plurality of portable units includes a portable-unit-identifying number assigned thereto and a second simultaneous call controller.

REFERENCES:
patent: 4682350 (1987-07-01), Akerberg
patent: 4792984 (1988-12-01), Matsuo
patent: 4856083 (1989-08-01), Makino
patent: 4965849 (1990-10-01), Kunihiro
patent: 4969205 (1990-11-01), Itoh
patent: 5014295 (1991-05-01), Kunihiro

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