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Stress test system with bidirectional filter

  • US 5,297,557 A
  • Filed: 10/14/1992
  • Issued: 03/29/1994
  • Est. Priority Date: 10/14/1992
  • Status: Expired due to Fees
First Claim
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1. A stress test system for eliminating noise contained in an accelerated ECG signal comprising:

  • electrode means for detecting bioelectric signals generated by accelerated hearts of human subjects and generating, therefrom, an analog electrical signal;

    digitizing means for converting said analog signal into a series of digital signals;

    processing means for performing digital processing on said series of digital signals;

    storage means operatively coupled to said processing means for storing data relating to said processing means operation, including storage of a predetermined length;

    segmentation means contained within said processing means for dividing said series of digital signals into a series of windows, each of said windows being of said predetermined length;

    filtering means contained within said processing means, said filtering means performing a bidirectional infinite impulse response (IIR) filter upon each of said windows; and

    comparison means contained within said processing means for determining when said filtering means has completed each pass of said bidirectional IIR filter by comparing the length filtered in each direction against said predetermined length.

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