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Measurement system having pole zero cancellation

  • US 4,260,951 A
  • Filed: 01/29/1979
  • Issued: 04/07/1981
  • Est. Priority Date: 01/29/1979
  • Status: Expired due to Term
First Claim
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1. A pulse rate measuring system for receiving during sample pulse intervals, a pulsed photocurrent signal including an ambient light and a reflected light carrier signal which is amplitude modulated by a heart blood pressure signal comprising:

  • signal processing means responsive to said pulsed photocurrent signal and including a second order loop having a first differentiator means providing a transfer function having a high pass pole at a first frequency,cancellation means for forming a zero at said first frequency to cancel the high pass pole of said transfer function; and

    second differentiator means coupled to said cancellation means for forming a high pass pole at a second frequency, andadditional pulse-shaping and output means coupled to said second differentiator means.

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