Portable-to-portable talk system for cordless telephone

Details Portable-to-portable talk system for cordless telephone Portable-to-portable talk system for cordless telephone

1992-04-29

1993-09-21

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

455 331, 455 541, H04M 1100

Patent

active

052475670

ABSTRACT:
A portable-to-portable talk system for cordless telephone. The transmitter-receiver of base unit has a control channel and a plurality of talk channels. The transmitter-receiver transmits the channel number of a vacant talk channel to a first portable unit and to a second portable unit over the control channel upon reception of a connection request from the first portable unit over the control channel. The transmitter-receiver is then switched from the control channel to the vacant talk channel after having transmitted the channel number of vacant talk channel over the control channel. Then, the receiver output of the transmitter-receiver is connected to the transmitter input. The transmitter-receiver of the portable unit has the control channel and the plurality of talk channels and transmits the connection request to the base unit over the control channel. The transmitter-receiver of portable unit is switched from the control channel to the vacant talk channel upon reception of the channel number of vacant talk channel from the base unit. A Tx/Rx selecting signal is transmitted over the vacant talk channel to other portable unit via the base unit when an operator of portable unit completes his speech. The second transmitter-receiver operates as a receiver when the Tx/Rx selecting signal is outputted from the local portable unit, and as a transmitter upon reception of the Tx/Rx selecting signal from other portable unit so that an operator is permitted to begin his speech.

REFERENCES:
patent: 3644681 (1972-02-01), Rice
patent: 4112257 (1978-09-01), Frost
patent: 4939785 (1990-07-01), Murata et al.

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