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A Method To Determine At The Source The Validity Of Transmitted Signals

IP.com Disclosure Number: IPCOM000098123D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Randlev, PL: AUTHOR

Abstract

A data transmission system, in addition to employing a self checking data code or a redundancy bit check, should employ a maximum security response code which indicates to the transmitting station that the received codal data represents a valid or invalid codal combination. In an eight bit code, a 4 out of 8 combination for a valid or invalid response signal where the combinations are diametrically opposed offers the maximum security. Thus, 11110000 for a valid signal and 00001111 for an invalid signal permits the signal to be recognizable under most adverse transmission difficulties.

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A Method To Determine At The Source The Validity Of Transmitted Signals

A data transmission system, in addition to employing a self checking data code or a redundancy bit check, should employ a maximum security response code which indicates to the transmitting station that the received codal data represents a valid or invalid codal combination. In an eight bit code, a 4 out of 8 combination for a valid or invalid response signal where the combinations are diametrically opposed offers the maximum security. Thus, 11110000 for a valid signal and 00001111 for an invalid signal permits the signal to be recognizable under most adverse transmission difficulties.

In the illustrated circuit the codal bits introduced in parallel on the input lines A through H are combined in the 5 way and circuits and 6 way or circuits such that a recognizable response is manifested even if three out of the eight bits are garbled.

By extension to accommodate N bits, the circuit will always be capable of recognizing with certitude any transmission in which N/2 bits or less are garbled, so long as the diametrically opposite disposition of the response signal code is maintained.

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