Fault detection method and apparatus

Details Fault detection method and apparatus Fault detection method and apparatus

2007-03-21

2009-11-03

Trimmings, John P (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C714S025000, C714S048000, C714S703000, C714S704000, C714S715000, C714S724000, C714S732000, C714S736000, C714S742000, C714S799000, C714S824000, C327S002000, C327S003000, C327S012000, C327S039000, C327S040000, C324S076210, C324S076290, C324S076230, C324S076240, C324S076520

Reexamination Certificate

active

07613974

ABSTRACT:
This invention relates to fault detection in electrical circuits. The invention provides a method and apparatus for testing an input circuit by generating a periodic test signal having a predetermined phase and a predetermined amplitude; summing the test signal and an input signal to provide a summed signal; processing the summed signal to provide an output signal; generating an extracted test signal from the output signal; comparing the extracted test signal with a reference signal representing said periodic test signal; generating an error signal in dependence upon the result of said comparing step. The invention also provides a method and apparatus for testing a plurality of adjacent input circuits.

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