Error-Detectable Data Format
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
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).