Computer Science

data that has been given structure or meaning

the basic unit of data within a computer system that has the value 0 or 1

Representation using binary sequences

Representing text using Unicode and ASCII

Text file size calculations

Representing bitmap images

Bitmap file size calculation

Representing sound

Calculation of sound file size

In this unit, pupils will discover how letters, images and sounds are represented with binary digits. They will also explore the factors that impact the quality of those representations and investigate the effects these quality choices have on file size.

Representation of text, images and sound

value of data at a specific point in time

a record of characters matched to a unique binary sequence

a character set that represents each character with a unique numerical value

a method of character representation that uses up to 32 bits per character

a word used in front of a number to represent a multiple of that number

putting a sequence of characters into an agreed format

a measure of how much binary data a file contains

a single element of an image on a computer screen

the number of bits used to represent the colour of each pixel, which is also known as bit depth

total amount of pixels an image contains based on its width and height expressed in pixels

accepting a limitation to achieve a beneficial outcome

the measurement of a sound wave at a point in time

the number of bits used to represent a sample

the number of samples captured per second

how close a measurement is to its actual value

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Representation of text, images and sound

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