Security alarm system
AssigneeSecom Co., Ltd.
InventorsKozaburo Tani, Tsutomu Watanabe
Life of this patent
Estimating the term…
Abstract
A security system comprising a plurality of sensors for detecting emergencies in a predetermined guard area, a transmitter-receiver for converting the emergency data into electric signals and transmitting the electric signals via a radio, a repeater for receiving the electric signals from the transmitter-receiver and transmitting the signal to a security controller, a security controller for setting a guard mode such as "start watch", and "release the watch" and transmitting the emergency and ordinary data to a central station through a transmission line such as a telephone cable or personal circuit, and a central station for supervising the predetermined guard area based on the data from this and other security controllers.
Claims5
A security alarm system for watching emergency situations in a predetermined guard area comprising:
- a plurality of sensors for detecting the emergencies;
- a transmitter-receiver for a guard area connected to said sensors and having a battery power source;
- a repeater associated with said transmitter-receiver through radio;
- a security controller connected to said repeater;
- and
- a central station connected to said security controller using a transmission line and giving a guard command to an operator on the basis of emergency or ordinary data transmitted from said security controller;
- means for providing a pulsating voltage from said power source for the guard area such that a predetermined pulsating voltage is applied from said battery power source to said transmitter-receiver under ordingary conditions, a predetermined voltage having a longer term than a period of said pulsating voltage is applied to a receiving section of said transmitter-receiver in response to a watch signal transmitted from said security controller via said repeater before transmitting a guard mode signal from said security controller and a predetermined voltage having a longer term than the said pulsating voltage is applied to a transmitting section of said transmitter-receiver in response to an emergency signal transmitted from said sensors at emergencies, or in response to said guard mode signal transmitted from said security controller via said repeater;
- said repeater stores the emergency and ordinary data transmitted from said transmitter-receiver temporarily;
- and
- said security controller reads out these data stored in said repeater, discriminates emergency or ordinary data, and transmits emergency data and guard mode signal to said central station.
Dependencies are inferred from the claim text.