A method for monitoring a biological parameter out of either the heartbeat and/or respiratory signal of an occupant (2) on a member of a seat (8) or bed, wherein a signal or signals received from one or a plurality of sensors (6) connected to the member and capable of detecting the variation of pressure due to contact are processed by non-linear filtering. For example, the method is mounted on a vehicle and used. Also provided is a computer program including code instructions capable of controlling execution of the method of the invention when the method is executed by a computer. Further provided is a monitoring device for monitoring a biological parameter out of either the heartbeat and/or respiratory signal of an occupant (2) on a member of a seat or bed.
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