A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
326/13.5
A61B 5/02 (2006.01) A61B 5/022 (2006.01)
Patent
CA 1108239
ABSTRACT OF THE DISCLOSURE 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 determin- ing 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 wave- front, as determined by the derivative exceeding a reference value. A threshold level is established which is repre- sentative of the magnitude of substantially only the time- derivative corresponding with the steeply rising wavefront. The time-derivative of the input signal is compared with the threshold level while the former exceeds the reference value to provide a control signal indicative of whether or not the time-derivative is representative of a valid steeply rising wavefront (as opposed to noise). Finally, the integral of a particular time-derivative is recognized as the quantized value of the steeply-rising wavefront only if the control signal indicates validity.
293711
Day Christopher C.
Haney Jerry D.
Jansen William D.
Schneeberger Stephen A.
American Optical Corporation
Macrae & Co.
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