FALL DETECTION DEVICE AND MAGNETIC DISK DRIVE
First Claim
1. A fall detection device comprising:
- an acceleration sensor that outputs a signal in accordance with acceleration;
a differentiator arranged to differentiate an output signal of the acceleration sensor;
an integrator arranged to integrate the output signal of the acceleration sensor; and
a state determination processor arranged to determine whether the output signal of the acceleration sensor is in a specific state in which a differential signal goes beyond a predetermined threshold and an integrated signal obtained by the integrator goes beyond a predetermined threshold;
wherein the integrator starts integration at a time when the differential signal goes beyond the predetermined threshold.
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Accused Products
Abstract
An acceleration sensor outputs a signal in accordance with acceleration. A differentiator outputs a differential signal of the output signal. A comparator inverts the state of an output when the differential signal goes beyond a threshold. A monostable multivibrator maintains the state-inverted signal of the output for a predetermined period of time. An integrator integrates the acceleration detection signal. A comparator inverts the state of an output signal when an integrated signal goes beyond a threshold. A fall determination processor outputs a signal out indicating that a fall has been detected in a situation in which, when the output of the monostable multivibrator is active, the state of the output of the comparator is inverted.
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Citations
8 Claims
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1. A fall detection device comprising:
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an acceleration sensor that outputs a signal in accordance with acceleration;
a differentiator arranged to differentiate an output signal of the acceleration sensor;
an integrator arranged to integrate the output signal of the acceleration sensor; and
a state determination processor arranged to determine whether the output signal of the acceleration sensor is in a specific state in which a differential signal goes beyond a predetermined threshold and an integrated signal obtained by the integrator goes beyond a predetermined threshold;
whereinthe integrator starts integration at a time when the differential signal goes beyond the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification