OCR GCSE 9-1 Computer Science 2.6 Data Representation

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Units
 Bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte, petabyte
 How data needs to be converted into a binary format to be processed by a computer.
Numbers
 How to convert positive denary whole numbers (0–255) into 8 bit binary numbers and vice versa
 How to add two 8 bit binary integers and explain overflow errors which may occur
 Binary shifts
 How to convert positive denary whole numbers (0–255) into 2 digit hexadecimal numbers and vice-versa
 How to convert from binary to hexadecimal equivalents and vice versa
 Check digits.
Characters
 The use of binary codes to represent characters
 The term ‘character-set’
 The relationship between the number of bits per character in a character set and the number of characters which can be represented (for example ASCII, extended ASCII and Unicode).
Images
 How an image is represented as a series of pixels represented in binary
 Metadata included in the file
 The effect of colour depth and resolution on the size of an image file.
Sound
 How sound can be sampled and stored in digital form
 How sampling intervals and other factors affect the size of a sound file and the quality of its playback: sample size, bit rate, sampling frequency.
Compression
 Need for compression
 Types of compression: lossy, lossless

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Created: Aug 1, 2016

Updated: Oct 6, 2018

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2.6-Data-Representation

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