Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1993-07-30
1995-06-20
Kuntz, Curtis
Telephonic communications
Audio message storage, retrieval, or synthesis
379 61, H04Q 720
Patent
active
054266904
ABSTRACT:
A cordless telephone apparatus detects the received field strength in a receive channel, as viewed from the base unit side, and if the field strength is below a prescribed level outputs an out-of-range signal on a receive channel, as viewed from the base unit side. The remote unit is provided with a volatile memory area for storing channel connection state data indicating whether or not two-way radio communication was established between the remote unit and the base unit. A backup power source enables the contents of the volatile memory area to be maintained even if there is an interruption in the supply of power from the battery in the remote unit. A call resumption control circuit to resume transmission of call information from the remote unit when internal power in the remote unit is supplied from the battery. The data in the volatile memory area indicating the channel connection state indicates whether two-way radio communication was established, and also detects an out-of-range signal transmitted from the base unit side.
REFERENCES:
patent: 4991198 (1991-02-01), Tate et al.
patent: 4995083 (1991-02-01), Baker et al.
patent: 5280541 (1994-01-01), Marko et al.
Akiyama Masaru
Hikuma Hideo
Cumming William
Kuntz Curtis
Uniden Corporation
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