Systolic pressure determining apparatus and process using integration to determine pulse amplitude

Abstract From the Canadian patent

Improved method and means for identifying and quantizing an effectively periodic, steeply-rising wavefront of an input signal in the possible presence of low amplitude interference, as for example in systolic pressure determining means utilizing a pressure cuff. A representation of the time-derivative of the steeply-rising wavefront is obtained. The time-integral of the time-derivative is obtained over a certain interval in each repetition of the steep wavefront, as determined by the derivative exceeding a reference value. A threshold level is established which is representative of the magnitude of substantially only the timederivative corresponding with the steeply rising wavefront. The …