| 摘要 |
PCT No. PCT/SE95/00629 Sec. 371 Date Jan. 7, 1997 Sec. 102(e) Date Jan. 7, 1997 PCT Filed Jun. 1, 1995 PCT Pub. No. WO95/33403 PCT Pub. Date Dec. 14, 1995For monitoring and estimating a person's wakefulness, a stationary pressure sensor contacts part of that person's body and generates a signal corresponding to that person's body movements relative to the sensor. A detector/filter circuit connected to the sensor separates signals corresponding to true body movements, heartbeat-related body movements, and respiration-related body movements. Calculation and comparison circuits are adapted to receive these signals and compare them with previously received signals to determine possible changes. A correlator correlates the output signals from the calculation and comparison circuits to produce a resulting change signal which is compared with a preset wakefulness threshold in a threshold detector circuit. An alarm device is triggered, when the preset threshold is reached as an indication of a reduced degree of wakefulness.
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