Computer Science

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

Representation of sound

Representation using binary sequences

Representing text using ASCII and Unicode

Text file size calculation

Representing bitmap images

Bitmap file size calculation

Calculation of sound file sizes

Metadata

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 a sound wave

a measurement of a sound wave at a point in time

What is a sample in the context of sound digitisation?

measuring a sound wave at a point in time

the total number of sound waves in a file

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

What is measured in hertz (Hz) during sound digitisation?

to ensure the binary sequence can be processed as expected

to reduce the file size of the sound wave

to increase the duration of the sound file

Why must the sample rate and bit depth remain consistent during digitisation?

Put these elements in order from smallest to largest:

What is the term for facts and figures in their raw form?

What term describes the total number of pixels in an image based on its width and height?

increasing colour depth to reduce quality

What happens if you increase the resolution of an image?

Representation of sound

Lesson outcome