Abstract: A method for measuring life parameters during sleep by a device including an accelerometer attached to the body of a sleeping subject. The method includes: (a) setting a hysteresis width having a maximum hysteresis value and a minimum hysteresis value; (b) reading, from the accelerometer, values of acceleration in three axes; (c) filtering the values of acceleration in each of the three axes with a band-pass filter to obtain filtered acceleration signals; (d) combining the filtered acceleration signals to obtain a signal level; (e) checking whether the signal level is higher than the current maximum hysteresis value and if so, setting the maximum hysteresis value to the signal level and setting the minimum hysteresis value to the maximum hysteresis value decreased by the hysteresis width; and (f) signaling a breath detection when detecting a transition from a falling edge to a raising edge.

Abstract: A method for measuring life parameters during sleep by a device including an accelerometer attached to the body of a sleeping subject. The method includes: (a) setting a hysteresis width having a maximum hysteresis value and a minimum hysteresis value; (b) reading, from the accelerometer, values of acceleration in three axes; (c) filtering the values of acceleration in each of the three axes with a band-pass filter to obtain filtered acceleration signals; (d) combining the filtered acceleration signals to obtain a signal level; (e) checking whether the signal level is higher than the current maximum hysteresis value and if so, setting the maximum hysteresis value to the signal level and setting the minimum hysteresis value to the maximum hysteresis value decreased by the hysteresis width; and (f) signaling a breath detection when detecting a transition from a falling edge to a raising edge.