Chapter 1 - Data Representation (IGCSE Computer Science)

A character set for all characters on a standard keyboard and control codes.

• Binary

• ASCII code

• Denary

• Bytes

A method used to reduce the size of a sound file.

• RLE

• Lossless

• Lossy

• Audio compression

The maximum rate of transfer of data across a network, measured in kilobits per second (kbps) or megabits per second (Mbps)

• Bandwidth

• Data transmission

• High Frequency

• Low Frequency

A number system based on 2 and can only use the values 0 and 1

• Denary Number System

• Hexadecimal Number System

• Binary Number System

• Octal Number System

The basic computing element that is either 0 or 1 and is formed from the phrase Binary digit

• bit

• byte

• kibibyte

• mebibyte

The number of bits used to represent the smallest unit in a sound file

• sampling rate

• bit depth

• sampling resolution

• bitmap

An image made up of pixels

• raw

• psd

• bitmap

• jpeg

A list of characters that have been defined by computer hardware and software. It is necessary so that the computer can understand human characters

• ASCII code

• Extended ASCII

• Unicode

• character set

The number of bits used to represent the colours of a pixel

• colour depth

• pixel

• bitmap

• image resolution

The reduction of the size of a file by removing repeated or redundant pieces of data; this can be lossy or lossless

• audio

• compression

• image

• RLE