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Method and apparatus for improved monitoring and detection of improper device operation

  • US 4,773,028 A
  • Filed: 10/01/1984
  • Issued: 09/20/1988
  • Est. Priority Date: 10/01/1984
  • Status: Expired due to Term
First Claim
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1. Apparatus for monitoring the operation of a device to detect improper operation thereof in response to the application of a series of test monitoring the operation of a device to detect improper operation thereof in response to the application of a series of test vectors applied thereto, said device generating information signals and operation signals in response to each applied test vector, said apparatus comprising:

  • predicting means for predicting correct operation of the device by generating expected information and operation signals in response to the application of the series of test vectors applied thereto;

    comparing means responsive to the operation of the device and to said predicting means for comparing the operation signals of the device with the expected operation signals in response to the same test vector;

    detection means responsive to said comparing means for detecting improper operation of the device; and

    storage means coupled to said device and to said prediction means responsive to said detection means for storing information signals representative of the operation of the device and the expected operation signals for the same application of test vectors, said storage means includes;

    first storage means coupled to the device responsive tosaid detection means for storing information signalsdescriptive of the operation of the device subsequent to the detection of improper operation of the device in responseto the corresponding operation and expected operationsignals; and

    ,second storage means coupled to the predicting meansresponsive to said detection means for storing expected information signals descriptive of the predicted correctoperation of the device subsequent to the detection ofimproper operation of the device in response to thecorresponding operation and expected operation signals.

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