Security system comprising a signal transmitter
First Claim
1. Security system comprising a signal transmitter (1) with a first sensor means (2) for conveying status information to a receiver means (3) via a telecommunication channel (4), the signal transmitter being built into telephone subscriber equipment (42) and the telecommunication channel comprising a subscriber line in a telephone network, a second sensor means (5), with a higher sensitivity than the first sensor means, being arranged to be influenced by the same environment as the first sensor means and to transmit alarm information to the receiver means via the telecommunication channel, time measuring means for opening a time slot of predetermined length for the transmittal of status information and alarm information to the receiver means in response to a signal from said second sensor means, and restoring means (6) operative without any external influence and within said time slot of predetermined length to transmit restoring information regarding the alarm information to the receiver.
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Accused Products
Abstract
A security system comprises a signal transmitter (1) with a first sensor (2) for conveying status information to a receiver (3) via a telecommunication channel (4), the signal transmitter being preferably built into a telephone set and the telecommunication channel preferably comprising a subscriber line in a regular telephone network. A second sensor having a higher sensitivity than the first sensor, is arranged to be influenced by the same alarm situation as the first sensor to transmit alarm information to the receiver via the telecommunication channel, and a restoring circuit (6) comprising time measuring components (7, 8) with an activation input (9) connected to the second sensor is, within a time slot of a predetermined length arranged for the transmittal of the status information and the alarm information, arranged to always transmit restoring information regarding the alarm information to the receiver.
27 Citations
18 Claims
- 1. Security system comprising a signal transmitter (1) with a first sensor means (2) for conveying status information to a receiver means (3) via a telecommunication channel (4), the signal transmitter being built into telephone subscriber equipment (42) and the telecommunication channel comprising a subscriber line in a telephone network, a second sensor means (5), with a higher sensitivity than the first sensor means, being arranged to be influenced by the same environment as the first sensor means and to transmit alarm information to the receiver means via the telecommunication channel, time measuring means for opening a time slot of predetermined length for the transmittal of status information and alarm information to the receiver means in response to a signal from said second sensor means, and restoring means (6) operative without any external influence and within said time slot of predetermined length to transmit restoring information regarding the alarm information to the receiver.
Specification