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Published byAlyssa Hudson Modified over 3 years ago

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Looking Inside the Black Box Input Output CPU Storage –Secondary - Hard Drives –Primary - RAM, ROM

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Storing Data Computers store Digital Data Two type of data –Digital – can be compressed –Analog Digital data – stored as digital data Text data – stored as ASCII codes (digital) Analog data – converted to digital

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Storing Data – Binary Numbers Binary Numbers

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Storing Data – Binary Numbers

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Storing Data – Binary Numbers 8 bits 0 = = = = = bits 0 = = = = = Used to store digital data

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Storing Data – Hexadecimal Base 16 0 = = = = = = = = = = 1001 A = 1010 B = 1011 C = 1100 D = 1101 E = 1110 F = 1111 Easy way to represent binary numbers Easy to convert between hex and binary

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Storing Data – ASCII DIGIT ASCII REPRESENTATION LETTER A B C D E F G H I ASCII REPRESENTATION Used to store text based

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32 blank A B C D E F G I I J K L M N O P Q R S T a b c d e f g h i j k l m n o p q r s t u

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ASCII Full ASCII Table F o u r a n d s e v e n

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Storing Data – Analog Data Must be converted to Digital Sample demo

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Converting Between Number Systems Binary to Decimal Decimal to Binary Binary to Hex Hex to Binary

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Converting Between Number Systems Decimal Binary

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Converting Between Number Systems Binary >Decimal > decimal > decimal Decimal > Binary 128 > binary 100 > binary Hex > Binary 1A > binary 0F > binary Binary > Hex > hex > hex ASCII > Decimal A > decimal a > decimal Decimal > ASCII > ascii > ascii

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Coding Data for Processing by a Computer Pixels Data Compression –Lossy - examples –Lossless - examples –?Examples of file types

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Data Compression Binary Data \ 12 bytes Compressed Data 4,0 16 7,255 5 bytes

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Compression Examples BMP (422kb)

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Compression Examples JPG 10% (66kb)

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Compression Examples JPG 85% (15kb)

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Compression - LZ Lempel – Ziv WinZip Dictionary to eliminate redundancy From - HowStuffWorks.com

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Compression - LZ Example –"Ask not what your country can do for you -- ask what you can do for your country. = 79 chrs –Dictionary: 1.ask 2.what 3.your 4.country 5.can 6.do 7.for 8.you u 1 not " = 37 chrs From - HowStuffWorks.com

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Compression - LZ Plus Dictionary = 37, Total = 74 vs 79 Real LZ uses patterns not words 1.ask__ 2.what__ 3.you 4.r__country 5.__can__do__for__you u "1not__ " = 16 chrs Dictionary = 41, Total = 57 From - HowStuffWorks.com

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