Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2000-12-01
2003-02-11
Trieu, Van (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S438000, C340S540000
Reexamination Certificate
active
06518889
ABSTRACT:
TECHNICAL FIELD
This invention relates to personal alarm systems and in particular to portable, self-locating, voice-activated personal alarms.
BACKGROUND ART
Personal alarms are known. They detect the presence of a specific danger and provide a signal for giving an alarm and for summoning help. It is also known to transmit the danger detection signal via a radio transmitter to a common base station which supervises multiple personal alarms. It is also known to use a wireless telephone communications system for that purpose. The incorporated references disclose a class of portable, self-locating personal alarms which include a satellite global positioning receiver for providing an accurate location of the monitor. These disclosed devices do not disclose a voice-activated device. It is desirable to provide such capability.
DISCLOSURE OF INVENTION
The need is met by the present invention which incorporates a satellite global positioning receiver, a specific danger sensor, a voice activation circuit, and a radio transmitter. In a specific embodiment, the satellite global receiver relies upon the U.S. Global Positioning System (“GPS”). In another specific embodiment, the radio transmitter is provided by a wireless telephone using an existing wireless communications network and therefore also provides a two-way voice communication channel. In a specific embodiment of the invention, a distress phrase such as “HELP!” spoken into a microphone is recognized and activates the radio transmitter to transmit the current global location. The detection of a specific danger by the danger sensor also activates the transmission of the current global location.
REFERENCES:
patent: 5475597 (1995-12-01), Buck
patent: 5719771 (1998-02-01), Buck et al.
patent: 5731785 (1998-03-01), Lemelson et al.
patent: 5748147 (1998-05-01), Bickley et al.
Baringer William B.
Schlager Dan
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