CS 9-28 - computer ← CD Audio • 44.1 KHz • 16-bit •...

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CS 105 9-28 28/09/2007 15:06:00 ASCII – American Standard for Information Interchange A system which was developed to represent text on the computer ISO-8859 Standard (used mainly) ISO-8859-1 Western Europe Iso-8859-5 Cyrillic Unicode Represents any character used in the world if 4 bytes are set aside UTF-8 Version of Unicode Always a set number of colors for a computer 8 bit color = 256 colors Digital music A sequence of numbers Works by taking a given number of samples using a wavelength and  reproducing that wavelength with those samples Higher sampling rates are better but take up more memory and space on the 
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Unformatted text preview: computer ← CD Audio • 44.1 KHz • 16-bit • 2-channel • Converting a CD to mp3 saves space • A 5 minute song would take up about half of a gig ← Frequency analysis • Psychoacoustics o The study of how humans hear sound o Humans can only hear at certain frequencies • Huffman encoding • MP3 o Lousy compression because we lose information ← Compression techniques • AAC o Used by apple • WMA o Used by microsoft 28/09/2007 15:06:00 ← 28/09/2007 15:06:00 ←...
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CS 9-28 - computer ← CD Audio • 44.1 KHz • 16-bit •...

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