METHOD FOR ANALYZING ACCELERATION PULSE WAVE IN ACCELERATION PULSE WAVE METER

摘要

PURPOSE:To easily and surely detect a singular point by detecting third and fourth zero cross points in a waveform, in which an acceleration pulse wave is differentiated three times, as the generation times of the singular points and detecting amplitude values at the generation times as the singular points. CONSTITUTION:For a finger thrust capacity pulse wave signal detected with a finger thrust pulse sensor 1, by differentiating it two times at an amplifying and differentiating circuit 2, an acceleration capacity pulse wave signal is generated. A microcomputer 4 fetches the acceleration capacity pulse wave signals from an A/D converter 3 and holds amplitude data to belong to a time base address. A singular point (a) is made into a maximum point, and the time base address and amplitude data are detected. Further, a differentiating processing is executed three times, simultaneously, the zero cross points successive to the singular point (a) are specified as the generation times of singular points (b)-(d), and the belonging amplitude data are detected as the singular points (b)-(d), respectively. Thus, the singular points (c) and (d) of respective kinds of patterns can be surely detected.