01:198:170 Lecture Notes - Lecture 4: Extended Ascii, Digitizing, Apple Lossless

• School: Rutgers University
• Department: Computer Science
• Course: 01:198:170
• Professor: D Nesci

Document Summary

Ascii- american standard code for information interchange code standard) Only english text & letter, uppercase & lowercase alphabet, mathematical symbols. Ibm created 8 bit system (extended ascii) Handles many languages whose alphabets are derived from the latin alphabet. Gave the 8 bit sequences a name: byte. English text: roman letters,arabic numerals, punctuation characters. 3 other characters (new line, tab, and backspace) Represents additional characters by using up to 32 bits to code characters. Utf-8 records unicode by writing long characters as groups of bytes. Universal product codes (upcs)- use additional bits to encode information. Upc encodes the manufacturer & the product. 3 guard bars in between-- act as separation. Variety of bit combinations used for each side. One side is the complement of the other. The bit patterns were chosen to appear as different as possible from each other. In the upc-a encoding, 7 bits are used to encode the digits 0 9.