Cordless telephone system

Details Cordless telephone system Cordless telephone system

2005-01-18

2005-01-18

Chin, Vivian (Department: 2682)

Telecommunications

Radiotelephone system

Including private cordless extension system

C455S463000, C455S464000, C455S465000, C455S416000, C455S555000, C455S041200, C455S041300

Reexamination Certificate

active

06845242

ABSTRACT:
A low cost cordless telephone system including a base unit, connected to a telephone network, which can transmit and receive RF signals to and from sub-communicating devices. The sub-communicating devices include a cordless microphone for converting acoustical signals to electrical signals and providing same to a transmitter which transmits corresponding simplex RF signals on a cordless telephone frequency to a base unit attached to a telephone network; and a cordless speaker which receives simplex RF signals from a base unit and broadcasts a corresponding telephone conversation. The base unit may connect directly to a telephone network or, in an alternate embodiment, to the handset jack of an existing telephone, thereby interfacing to existing phones including those connected to digital telephone systems. The base unit may also include a speaker used to broadcast the telephone conversation. The base unit speaker and the cordless speaker each may optionally broadcast both sides of the phone conversation, including the presenter's speech received from the cordless microphone. The system may also be interfaced to an existing sound system via a remote interface unit or the base unit.

REFERENCES:
patent: 4363935 (1982-12-01), Toya
patent: 4829500 (1989-05-01), Saunders
patent: 5177784 (1993-01-01), Hu
patent: 5758289 (1998-05-01), Lipp
patent: 5771438 (1998-06-01), Palermo
patent: 5809417 (1998-09-01), Nealon

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