SUDDEN-ONSET SIGNAL PROCESSING DEVICE FOR BIOLOGICAL INFORMATION, AND SUDDEN-ONSET SIGNAL PROCESSING METHOD FOR BIOLOGICAL INFORMATION

摘要

In order to properly detect biological information without being affected by sudden-onset signal, even if a strong, sudden-onset vibration occurs during the operation of a vehicle or the like, the peak values of the input and output of a variable-type delay device are detected, and the difference is found by subtracting the two peak values using a subtractor. Next, this differential signal is compared with a predetermined threshold value, and either a positive output, if the differential signal is greater than the threshold value, or a negative output, if the differential signal is smaller than the threshold value, is obtained as an up/down selection output for an up/down counter. The output of the up/down counter is sent to a variable-type delay device via a clock generated on the basis of a peak signal of biological information inputted to the variable-type delay device, and a variable delay amount corresponding to one cycle of the biological information is obtained. Furthermore, when the output from the subtractor exceeds the predetermined threshold value, a predetermined output voltage is generated and controlled such that, as a result of said voltage, the gain of an amplifier connected to the variable-type delay device reaches zero.