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Error-Detectable Data Format

IP.com Disclosure Number: IPCOM000065489D
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Sueta, Y [+details]

Abstract

This article describes an error-detectable data format in which an error-detect bit is inserted between a parity bit and a stop bit. Fig. 1 shows a data format for keyboard data and clock pulses for shifting each bit in the keyboard data sent from a keyboard unit. In the key to display operations, a keyed character, such as "H" is frequently changed to another character, such as character "5" in a noise circumstance. Fig. 2 shows the mechanism for explaining such error. Fig. 2(a) shows the nominal data format of the character "H" which has a hexadecimal notation, X'33'. If a noise signal occurs around bit positions 5 and 6, in the Fig. 2(a), the data "1" is undesirably shifted by the noise signal so that the successive data bits, a parity bit (p) and a stop bit are undesirably shifted, as shown in Fig. 2(b).