Excavating
Patent
1979-12-03
1982-01-19
Malzahn, David H.
Excavating
G06F 1112
Patent
active
043120717
ABSTRACT:
A digitally coded output is provided from a sensor, such as an aircraft angle of attack sensor. Groups of unused words from the complete unit distance table are omitted between groups of words that are selected to be used in the code, these unused words being "illegal" words indicating an error if they appear in the output of the sensor. The digitally encoded output of the sensor is, in the preferred embodiment, in unit distance code, and is fed to a programmed ROM where it is converted to binary or other convenient code, this binary encoded information representing the sensor output being employed to convey the information provided thereby. The output of the sensor is also fed to a second programmed ROM which has information stored therein indicative of which of the code words are "illegal". Whenever an illegal word is fed to this second programmed ROM, it generates a digital output indicating an error. This output is used to drive an alerting device to provide a warning to the operator that there is an error in the system's output. A third ROM is used to check the pairty of the code converting ROM to ensure detection of a ROM error.
REFERENCES:
patent: 3860908 (1975-01-01), Stratton
patent: 4059749 (1977-11-01), Feilchenfeld
patent: 4173752 (1979-11-01), Yamanaka
Malzahn David H.
Safe Flight Instrument Corporation
Sokolski Edward A.
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