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HEART MONITORING APPARATUS FOR A MOTOR VEHICLE

  • US 3,731,672 A
  • Filed: 10/04/1971
  • Issued: 05/08/1973
  • Est. Priority Date: 10/04/1971
  • Status: Expired due to Term
First Claim
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1. Apparatus for monitoring the physiological condition of an occupant of a motor vehicle during vehicle operation comprising;

  • pickup means for sensing an electrical signal related to the physiological condition of the vehicle occupant, signal conditioning means connected with said pickup means, rectifier means connected with said signal conditioning means for developing an output pulse corresponding to each excursion of the conditioned signal above and below respective upper and lower-voltage levels, pulse generating means for generating a trigger pulse train corresponding to the leading and trailing edge of each output pulse, pulse stretcher means responsive to said trigger pulse train for developing a pulse of duration greater by a fixed time interval than the duration of said trigger pulse train, adjustable pulse stretcher means responsive to the first pulse in said trigger pulse train for developing a pulse of adjustable duration, comparator means responsive to the output of said fixed and adjustable pulse stretchers for developing an error pulse output of duration proportional to the difference in the duration of the output of said fixed and adjustable pulse stretcher means, means including ratiometer means responsive to said error signal for indicating the magnitude and polarity of said error signal, means for manually adjusting the output of said adjustable pulse stretcher to produce a null output from said ratiometer means whereby said ratiometer indicates any significant change in the width of the output signal of said signal conditioning means subsequent to adjustment of said adjustable pulse stretcher, means for counting the number of pulses in said trigger pulse train and for inhibiting the output of said fixed and adjustable pulse stretchers when the number of pulses in said pulse train are less than or greater than a predetermined number.

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