Digital recognition circuits

Details Digital recognition circuits Digital recognition circuits

1979-08-20

1981-01-20

Nusbaum, Mark E.

Communications: electrical

Digital comparator systems

364900, G06F 702

Patent

active

042465699

ABSTRACT:
A circuit for monitoring digital data comprises a shift register for receiving the data to be monitored, the outputs of the shift register being fed either directly to the inputs of memory devices or via controllable gates. The memories are programmed to detect the number of logical `ones` present in the shift register, and the detected number is compared with a reference to determine whether the data should be accepted or rejected. In one mode of operation, the controllable gates alter the inputs to the memories such that they are all the same when the correct data is in the shift register. In another mode of operation, the gates supply the memories with unaltered data and the circuit can detect errors because the data is coded in such a manner that each block of data should contain the same number of digits and the same number of logical `ones`.

REFERENCES:
patent: 3480931 (1969-11-01), Geissler et al.
patent: 3919531 (1975-11-01), Bobel et al.
patent: 3999164 (1976-12-01), Kashio
patent: 4023024 (1977-10-01), Bishop

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