Fall detection method and system
First Claim
1. A fall detection method, comprising the steps of:
- detecting a power supply voltage of an acceleration sensor;
comparing the detected power supply voltage with a reference power supply voltage of the acceleration sensor;
compensating an output of the acceleration sensor based on a comparison result; and
making a fall determination based on the compensated output of the acceleration sensor.
1 Assignment
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Accused Products
Abstract
Abnormality detection means 21 performs an abnormality determination when a power supply line 2 has the voltage lower than a reference power supply voltage VDD. If any abnormality is detected, the detection result is forwarded to sensor output compensation means 22, indicating a voltage decrease from the reference power supply voltage VDD. Based on the voltage decrease, the sensor output compensation means 22 accordingly compensates a voltage signal Vout coming from an acceleration sensor 1. Fall determination means 23 plots, on a time axis, the voltage output Vout of the acceleration sensor 1 after compensation made by the sensor output compensation means 22, and based on any change observed for the voltage output Vout on the time axis, makes a fall determination. In such a structure, a method and system for correct fall detection can be provided, without causing cost increase, through acceleration detection made properly despite any decrease observed for the power supply voltage of an acceleration sensor.
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Citations
9 Claims
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1. A fall detection method, comprising the steps of:
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detecting a power supply voltage of an acceleration sensor;
comparing the detected power supply voltage with a reference power supply voltage of the acceleration sensor;
compensating an output of the acceleration sensor based on a comparison result; and
making a fall determination based on the compensated output of the acceleration sensor. - View Dependent Claims (2)
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3. A fall detection system, comprising:
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an acceleration sensor for acceleration detection; and
control means for compensating, when a power supply voltage of the acceleration sensor shows a change, an output of the acceleration sensor based on a voltage change from a reference power supply voltage of the acceleration sensor, and making a fall determination based on the compensated output of the acceleration sensor. - View Dependent Claims (4)
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5. A recording and/or reproduction system, comprising:
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recording and/or reproduction means for recording and/or reproducing data to a recording medium;
an acceleration sensor for acceleration detection; and
control means for compensating, when a power supply voltage of the acceleration sensor shows a change, an output of the acceleration sensor based on the change of the power supply from a reference power supply voltage of the acceleration sensor, making a fall determination based on the compensated output of the acceleration sensor excuting, when the fall determination is made, a retract operation to the recording and/or reproduction means with respect to the recording medium. - View Dependent Claims (6, 7, 8, 9)
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Specification