| 摘要 |
<p>The invention relates to a security system comprising a signal transmitter (1) with a sensor means (2) for conveying a status information to a receiver means (3) via a telecommunication channel (4). According to the invention, a second sensor means (5) is, with a higher sensitivity than the first mentioned sensor means, arranged to be influenced by one and the same environment as this and to transmit an alarm information to the receiver means via the telecommunication channel, and a restoring circuit (6) comprising time measuring means (7, 8) with an activation input (9) connected to the second sensor means is, 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 means, the signal transmitter being preferably built into a telephone set and the telecommunication channel comprising preferably a subscriber line in a regular telephone network.</p> |
