| 摘要 |
The method for protection of a door against intrusion is applicable to a flat, house or an individual room, and involves using a detector for sensing the presence of an individual or a group of individuals in front of the door. The method also involves producing an alarm signal to deter intrusion. There may also be a detector sensing pressure on the door, and a camera for recording an image of the individual outside. A further detector may be used to sense the level of light outside in order to adjust the camera accordingly. The recorded image may be sent to a computer, via a modem. The method may also include using a voice synthesiser for replay of a prepared message. A complete system may be mounted within a housing attached to the inside surface of a protected door.
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