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Validity Check Circuit

IP.com Disclosure Number: IPCOM000098300D
Original Publication Date: 1960-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Potochniak, T: AUTHOR [+2]

Abstract

A circuit is provided for checking the validity of a character using, for example, a two out of five code. The circuit, for a valid character, is conditioned by two bits and when interrogated at a later time by a sample pulse, an output is detected on a sense winding.

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Validity Check Circuit

A circuit is provided for checking the validity of a character using, for example, a two out of five code. The circuit, for a valid character, is conditioned by two bits and when interrogated at a later time by a sample pulse, an output is detected on a sense winding.

A core 10 has five input windings 11, 12, 13, 14 and 15 corresponding to the five possible bits in the code. The input windings are driven by associated amplifiers 16 which receive the five lines of the code transmission system at terminals 17.

Bias winding 18 is provided for adjustments. Sample winding 19 switches the core at sample time if it has been conditioned by inputs on two and only two windings 11.. 15. Output winding 20 and sense amplifier 21 detect switching of the core at sample time.

A signal on only one winding 11.. 15, in conjunction with the sample pulse on winding 19, is insufficient to switch core 10. Therefore, there is not an output on winding 20 at sample time. Signals on more than two windings 11.. 15 switch the core 10 immediately. Therefore, the later sample pulse cannot switch the core and there is not an output on winding 20 at sample time.

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