Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1988-07-18
1990-07-03
Lev, Robert
Telephonic communications
Audio message storage, retrieval, or synthesis
379 58, 455127, 455343, H04Q 704
Patent
active
049397702
ABSTRACT:
A cordless telephone system includes a fixed unit and a portable unit which communicate with each other over a radio link. The portable unit includes a rechargeable battery, and a battery saving device for interrupting a power supply to predetermined sections of the portable unit in response to a control signal. The fixed unit includes a charging device for converting and AC voltage into a DC voltage to produce a charging voltage, and a detecting device for detecting when the rechargeable battery is being charged by the charging voltage, and for outputting a detection signal in response thereto. The fixed unit further includes a supplying device which is responsive to the detection signal for outputting the control signal and for supplying the control signal to the portable unit together with the charging voltage.
REFERENCES:
patent: 4458111 (1984-07-01), Sugihara
patent: 4479125 (1984-10-01), Mori
patent: 4593155 (1986-06-01), Hawkins
patent: 4639549 (1987-01-01), Hirayama et al.
patent: 4656653 (1987-04-01), Oda et al.
patent: 4726052 (1988-02-01), Kato et al.
patent: 4736404 (1988-04-01), Anglikowski et al.
patent: 4755816 (1988-07-01), DeLuca
patent: 4761806 (1988-08-01), Toki
Lev Robert
NEC Corporation
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