Time calibration method for security system using sensors
AssigneeNihondensikougaku Co., Ltd.
InventorsKouji Orita, Takehiro Orita, Kimito Kuriuchi
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Abstract
Among multiple surveillance devices for mechanical security monitoring provided in a security system using sensors at least one of the multiple surveillance devices is equipped with a receiver for receiving standard time data and the standard time data received by the receiver is sent over a distribution line to required surveillance devices not equipped with receivers. This enables highly accurate time calibration among the multiple surveillance devices for mechanical security monitoring to be efficiently achieved using a power-line carrier (PLC) technology and, as such, allows sharing of accurate time data among the surveillance devices.
Claims7
A time calibration method for a security system using sensors that enables time calibration of clocks of multiple surveillance devices used by the security system to identify the time of occurrence of a sensed event, the method comprising:
- a step of receiving standard time data from a time source external to said security system in at least one of the multiple surveillance devices of the security system;
- a step of sending the standard time data received over a distribution line to other surveillance devices for calibrating each clock in said surveillance devices;
- and
- a step of storing output data from a sensor with a calibrated time clock signal.
Dependencies are inferred from the claim text.