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Validity Checking

IP.com Disclosure Number: IPCOM000098904D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Sotak, MW: AUTHOR

Abstract

This device checks a biquinary code for the presence of one, and one only, bit in each of the quinary and binary portions of the code.

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Validity Checking

This device checks a biquinary code for the presence of one, and one only, bit in each of the quinary and binary portions of the code.

The quinary bit signal is applied to the grid of one of tubes T1-T5 and to a Kirchkoff circuit which controls tube T11. The binary bit is applied to the grid of one of tubes T6-T7 and OR switch S1.

One quinary bit and one binary bit produce a signal to block tube T8, causing tube T10 to conduct and drop the output voltage so as to give a valid output signal at F. With no binary bit or no quinary bit, T8 is not blocked and the output voltage remains up, so that an error output signal results.

More than one quinary bit causes T11 to be cut off, so that the output voltage rises and an error output results. An extra binary bit operates S1 and turns tube T9 on to cut T1O off. This raises the output voltage and results in an error signal.

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