Device for monitoring physical activity of persons
First Claim
1. Apparatus for monitoring the movements of a person, comprising an individual monitoring device to be carried by the person whose movements are to be monitored, said device comprising a displacement detector, the displacement detector being arranged to supply a continuously variable signal dependent on the positional changes of the device, signal processing means receiving said signal, the signal processing means comprising a band pass filter for receiving the signals supplied by the displacement detector, the pass band of the filter being such that the said filter will only allow signals due to changes in position of the device consequent upon the monitored person'"'"'s "normal" movements to pass, and at least one alarm device operatively connected to the signal processing means to provide an alarm in the absence of said signals due to the monitored person'"'"'s "normal" movements.
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Abstract
An individual monitoring device is carried by a person whose movements are to be monitored. The monitoring device comprises a displacement detector arranged to supply a continuously variable signal dependent on the positional changes of the device, signal processing circuit receiving the signal and at least one alarm device operatively connected to the signal processing circuit to provide an alarm in the absence for longer than a predetermined time of a signal due to the monitored person'"'"'s "normal" movements. The signal processing means comprises a band pass filter for receiving the signal supplied by the displacement detector. The pass band of the filter only allows signals to pass which are due to changes in position of the device consequent upon the monitored person'"'"'s normal movement.
38 Citations
9 Claims
- 1. Apparatus for monitoring the movements of a person, comprising an individual monitoring device to be carried by the person whose movements are to be monitored, said device comprising a displacement detector, the displacement detector being arranged to supply a continuously variable signal dependent on the positional changes of the device, signal processing means receiving said signal, the signal processing means comprising a band pass filter for receiving the signals supplied by the displacement detector, the pass band of the filter being such that the said filter will only allow signals due to changes in position of the device consequent upon the monitored person'"'"'s "normal" movements to pass, and at least one alarm device operatively connected to the signal processing means to provide an alarm in the absence of said signals due to the monitored person'"'"'s "normal" movements.
Specification