System for presuming sleep indexes and sleep stages by method for measuring physiological parameters in unconstrained manner
An unconstrained, detection system technology, applied in the field of sleep measurement system, can solve the problems of large-scale device and high cost, failure to achieve practicality, attenuation, etc.
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[0029] 2. Example of pneumatic method
[0030] 2.1 Pneumatic way
[0031] figure 1 It shows the principle of the pneumatic system proposed by the inventor. Under the mattress (or under the quilt) of the family bed, lay an air mattress made of vinyl with a thickness of about 5mm. The internal pressure of the air mattress is the same pressure as the atmospheric pressure. When a person lies on the mattress, body movements such as pulse and turning over are transmitted to the air in the air mattress through the mattress.
[0032] The pressure change of the air was measured with an ultra-high-sensitivity pressure sensor (S11-M2 manufactured by Primo Corporation).
[0033] The pressure sensor can measure the pressure change of 0.2Pa-2Pa, and has a flat frequency characteristic at 0.1-3kHz [13]. The signal measured by the pressure sensor is input into the human body signal separation circuit.
[0034] After passing through a 5-10Hz band-pass filter in the human body signal separ...
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