Handheld data capture system with power and safety monitor and method therefore
AssigneeSensormatic Electronics Corporation
InventorsSteven V. Leone, Larry K. Canipe
Life of this patent
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Abstract
The present invention provide a motion detection circuit for a handheld item detection system, where the motion detection circuit includes an accelerometer outputting at least one signal corresponding to a measured acceleration. A differentiator differentiates the measured acceleration. A motion detection device evaluates a discriminated version of the acceleration and a discriminated version of the acceleration to determine whether the handheld item detection system is in motion. The present invention extends battery life and allows a handheld system to quickly enter an active operational mode without any user intervention other than handling (moving) the system.
Claims20
A motion detection circuit for a handheld item detection system, the motion detection circuit comprising:
- an accelerometer, the accelerometer outputting at least one signal corresponding to a measured acceleration;
- a differentiator, the differentiator differentiating the at least one signal corresponding to the measured acceleration;
- and
- a motion detection device, the motion detection device evaluating a discriminated version of the acceleration and a discriminated version of the differentiated acceleration to determine whether the handheld item detection system is in motion.
A handheld item detection system, comprising:
- a motion detection circuit, the motion detection circuit including:
- an accelerometer, the accelerometer outputting at least one signal corresponding to a measured acceleration;
- a differentiator, the differentiator differentiating the acceleration;
- and
- a motion detection device, the motion detection device evaluating a discriminated version of the acceleration and a discriminated version of the differentiated acceleration to determine whether the handheld item detection system is in motion.
A method for detecting motion of a handheld item detection system, the method comprising:
- measuring acceleration;
- generating at least one signal corresponding to the measured acceleration;
- generating at least one differentiated signal corresponding to a rate of change of the measured acceleration;
- evaluating the measured acceleration and at least one differentiated signal to determine whether the handheld item detection system is in motion;
- exiting a low power mode if the handheld system item detection system is determined as being in motion;
- evaluating the at least one signal corresponding to acceleration;
- and
- using a processor for determining whether the motion correlates to predetermined abnormal motion criteria.
Dependencies are inferred from the claim text.