Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1988-03-17
1989-11-21
Lev, Robert
Telephonic communications
Audio message storage, retrieval, or synthesis
379 63, H04M 1100
Patent
active
048827460
ABSTRACT:
A cordless telephone system has a master unit connected to a telephone line and having a radio transceiver and a plurality of sub-units having radio transceivers and transmittable to and receivable from the telephone line through the master unit. Speech from the telephone line can be transferred between any sub-units, and speech by press-to-talk system is enabled between any sub-units through the master unit. A multi-purpose controller is provided in the master unit to enable control of an equipment by dialing from a sub-unit. For example, a tape recorder is operated, an automatic response/record function is operated, an interphone function is operated, a call from the telephone line can be directed to any sub-unit by a signal from the sub-unit, and all sub-units can be simultaneously or sequentially called from the telephone line. In the speech between sub-units by the press-to-talk system, signals representing start and end of the speech are generated by the sub-unit to control holding and release of an external telephone line of a master unit repeater so that speech with the external line is restored immediately after the end of the speech between the sub-units. When one sub-unit is in speech, other sub-units cannot hear the speech.
REFERENCES:
patent: 4500752 (1985-02-01), Lee
patent: 4508935 (1985-04-01), Mastromoro
patent: 4640987 (1987-02-01), Tsukada et al.
patent: 4672658 (1987-07-01), Kavehrad
patent: 4677655 (1987-06-01), Hashimoto
patent: 4706278 (1987-11-01), Baker et al.
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