System to transmit vital signals from moving body with dynamic external disturbance and to compensate artifact thereof

A method of transmitting vital signals from a moving human body in the presence of dynamic external disturbance and compensating for artifacts thereof, comprising:

• an A/D conversion step converting the signals output from the three axis acceleration sensor part into digital signals, at the A/D converter;
• a differential operation step calculating acceleration differential signal against each of the X, Y, Z axis directions, from three axis acceleration signals output by the A/D converter;
• a mean operation step obtaining a mean value of the acceleration differential signals against X, Y, Z axis directions by calculating the mean value of the signals output from the differential operation step;
• a step determining whether it is a stopped or moving condition by determining from the result of the mean operation step that human body is moving on foot if the mean value of differential signals of Z axis direction is greater than the first reference value, and that a human body has stopped during moving on foot if it is smaller than or equal to the first reference value;
• a step determining whether it is a stopped condition during vehicle transport, in case it is determined to be a stopped condition at the step determining whether it is a stopped or moving condition because the mean value of acceleration differential signals of Z axis direction is equal to or smaller than the first reference value, which determines that it is vehicle transport when the mean value of X,Y axis acceleration difference signals is greater than the second reference value and that it is transport on foot if the mean value of X, Y axis acceleration difference signals is smaller than the second reference value;
• a spectrum operation step obtaining a mean spectrum of Z axis in case the condition is determined to be moving because the mean value of acceleration differential signals of Z axis direction is greater than the first reference value at the step determining whether it is a stopped or moving condition;
• and
• a spectrum comparing step which determines that the moving is on foot if the mean spectrum value of Z axis is greater than a third reference value, and
• determines that the moving is on a vehicle if the mean spectrum of Z axis is smaller than a third reference value by comparing the calculated mean spectrum of Z axis with a third reference value.

In an apparatus for measuring and transmitting vital signals, the system to transmit vital signals from a moving human body in the presence of dynamic external disturbance and to compensate for artifacts thereof comprising:

• a three axis acceleration sensor part detecting each of an X, Y, Z axis accelerations and converting them into electronic signals;
• a pre-amplifier part pre-amplifying the output of three axis acceleration sensor part and removing the high frequency noise to supply only signals in the band for digital signals processing;
• an A/D converter converting the output signals of the pre-amplifier part into digital signals;
• a digital signals processing part operating on the three axis acceleration signals output by the A/D converter and detecting a level of vibration and movement;
• a transmitter part transmitting the result of the digital signals processing part, the three axis acceleration signals, and the measured vital signals;
• and
• an adaptive filtering part receiving signals from the transmitter part and removing vibration signals contained in the vital signals.