9/11/08ESE218 Fall 2008 Lecture 41ESE218 Lecture 4. Error detection and correction.Introduction to switching algebra. Logic gates OutlineASCII Error detection and correctionParity bitDistanceIntroduction to Hamming codes Introduction to switching algebraOperators and operator precedenceFunctions of two variablesLogic operations and gates AND, OR, NOT NAND, NORXOR, XNORparity generation and checkingGray-to-binary code conversion Propagation delaySummary
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9/11/08ESE218 Fall 2008 Lecture 42American Standard Code for Information Interchange (æski)The American Standards Association (ASA, later to become ANSI) first published ASCII as a standard in 1963 5-bit7-bitHEX form:0D=00001101MSB=0 for all =>128 codes An upper case character can be changed to the corresponding lower case characterby changing a single bit: 0100 -> 0110