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4.Data.Representation

4.Data.Representation - Data Representation With thanks to...

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1 Data Representation With thanks to Dr. Haipeng Guo Lecture 4

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2 Introductory Stuff rhombus6 Have Fun! rhombus6 Please turn off your phones! rhombus6 rhombus6 DO DO interact with me!
3 Outline rhombus6 Distinguish between analogue and digital information rhombus6 Explain data compression and compression ratios rhombus6 Examine the binary formats for negative values rhombus6 Describe the characteristics of the ASCII and Unicode character sets rhombus6 Explain the nature of sound and its representation rhombus6 Explain how RGB values define a colour rhombus6 Look at representing Audio Information rhombus6 Look at representing Images & Graphics rhombus6 Look at representing Video Information

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4 Data Representation rhombus6 Data comes in many forms square6 Numbers: 235, 11.01, -24, … square6 Text: “hello, world!” “ 你好！ square6 Audio: .mp3 square6 Images and graphics: .bmp, gif, JPEG square6 Video: .avi rhombus6 All of the data is stored in computers as binary digits rhombus6 Data must be represented in a way that square6 Captures the essence of the information square6 And in a form that is convenient for computer processing
5 Data Compression rhombus6 Data compression square6 Reduction in the amount of space needed to store a piece of data rhombus6 Compression ratio square6 The size of the compressed data divided by the size of the original data rhombus6 Data compression techniques can be square6 lossless , which means the data can be retrieved without any loss of the original information, square6 lossy , which means some information may be lost in the process of compaction

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6 WinRAR rhombus6 Currently the best archiver rhombus6 WinRAR Tutorial http://users.pandora.be/soulmaniacs/winrar.html
7 Analogue and Digital Information rhombus6 Computers are finite rhombus6 Computer memory and other hardware devices have only so much room to store and manipulate a certain amount of data rhombus6 The goal is to represent enough of the world to satisfy our computational needs and our senses of sight and sound

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8 Analogue and Digital Information rhombus6 Information can be represented in one of two ways: analogue or digital Analogue data : A continuous representation, analogous to the actual information it represents Digital data : A discrete representation, breaking the information up into separate elements rhombus6 A mercury thermometer is an analogue device rhombus6 The mercury rises in a continuous flow in the tube in direct proportion to the temperature
9 Analogue Data rhombus6 A mercury thermometer is an analogue device. The mercury rises in a continuous flow in the tube in direct proportion to the temperature.

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10 Analogue and Digital Information rhombus6 Computers, cannot work well with analogue information rhombus6 So we digitize information by breaking it into pieces and representing those pieces separately rhombus6 Why do we use binary?
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