Telephonic communications – Emergency or alarm communications – Responsive to sensed nonsystem condition
Patent
1990-07-11
1992-12-22
Dwyer, James L.
Telephonic communications
Emergency or alarm communications
Responsive to sensed nonsystem condition
379 44, 379 47, 340531, 340522, H04M 1104
Patent
active
051739321
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a security system comprisig a signal transmitter with a sensor means for conveying a status information to a receiver means via a telecommunication channel.
STATE OF THE PRIOR ART
U.S. Pat. No. 4,558,181 describes a security system of the above-mentioned kind. This known system comprises a portable transmitter arranged to be capable of conveying synthetic speech for different alarm messages, e.g. intrusion, inundation, low temperature and power failure, as well as acoustic signals generated by stand-alone fire detectors, etc.
A problem with this known security system and with all others of the kind is that the market is limited since installations that combine good false alarm protection with a sure and early alarm function are difficult to make inexpensive.
DESCIPTION OF THE INVENTION
The invention relates to a security system that can, at a low cost of installation, combine good false alarm protection with a sure and early alarm function.
In a preferred embodiment of the invention, a subscriber line in a regular telephone network is used as the only wiring, and the only equipment is a calling and called telephone set.
According to the invention, an alarm can be conveyed between the calling and called telephone sets locally along the subscriber line as well as externally to a predetermined subscriber or to a stored program controlled exchange arranged to process the alarm, for example to call a plurality of telephone numbers, the same conditions enabling a sure and early alarm function being used, according to the invention, for preventing false alarms as defined in the subsequent patent claims.
Besides using the common push-buttons on the calling telephone set, commonly used tone code dialers can be utilized for entering alarm messages as well as for preventing alarm upon entrance into a protected area.
For recording and reproduction of freely selected spoken or tone coded messages, according to the invention, commonly known telephone answering equipments can be utilized without any changes in their manuals.
However, if the alarm receiver is a modern paging unit, recorded spoken messages as well as synthetic speech substitutes are the wrong technology. In any case, a low cost semiconductor memory for the storage of the alarm messages in the calling telephone set constitutes a preferred basic component for realizing the invention.
For an intrusion alarm, the preferred embodiment of the invention uses a capacitive sensor means built into the calling telephone set and designed in such a way that a presence indication within an accurately defined radius is obtained.
DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The invention will be described with reference to the accompanying drawing in which FIGS. 1, 2 and 3 are block diagrams of the preferred embodiments of a security system according to the invention, and FIG. 4 is a perspective view of a preferred design of a telephone set that constitutes a complete security system according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows a block diagram of the preferred embodiment of the security systems of the invention, comprising an alarm transmitter 1 with a sensor means 2 arranged to transmit a status information to a receiver 3 via a telecommunication channel 4. According to the invention, there is a sensor means 5 arranged, with a higher sensitivity than the sensor means 2, to be influenced by one and the same environment as this and to convey an alarm information to the receiver 3 via the telecommunication channel 4, a restoring circuit 6 comprising time measuring means 7 and 8 with an activation input 9 connected to the sensor means 5 being, without any external influence and within a time slot of a predetermined length arranged for the transmittal of the status information and the alarm information, arranged to transmit a restoring information regarding the alarm information to the receiver 3.
The alarm transmitter 1 with the sensor means 2 and 5 for the status information and the alarm
REFERENCES:
patent: 3883695 (1975-05-01), Bickel et al.
patent: 4056684 (1977-11-01), Lindstrom
patent: 4145581 (1979-03-01), Stockdale
patent: 4195286 (1980-03-01), Galvin
patent: 4471346 (1984-09-01), Nelson et al.
patent: 4565902 (1986-11-01), Phillipps
Johansson Jan Lennart
Wern Lars A.
Chan Wing F.
Dwyer James L.
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