Computer Science

Metadata

Representation using binary sequences

Representing text using ASCII and Unicode

Text file size calculation

Representing bitmap images

Bitmap file size calculation

Representation of sound

Calculation of sound file sizes

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

the number of bits used to represent each pixel

Which of the following is an example of metadata in an image file?

What does metadata for a sound file include?

What is the smallest element of an image?

the number of bits used to represent a pixel’s colour

What does the resolution of an image determine?

What is the process of converting data into binary called?

What term describes the number of samples taken per second in a sound file?

What happens when you increase the sample rate of a sound file?

Metadata

Lesson outcome