Computer Science

how close a measurement is to its actual value

British English CC

Calculation of sound file sizes

Representation using binary sequences

Representing text using ASCII and Unicode

Text file size calculation

Representing bitmap images

Bitmap file size calculation

Representation of sound

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

What does adjusting the sample bit depth affect when digitising sound?

sample rate, duration and sample bit depth

What three factors determine the size of a sound file?

What happens if the sample rate is too low?

the file size decreases, and the sound quality improves

the file size increases, and the sound quality improves

the file size stays the same, and the sound quality improves

What is the effect of increasing both sample rate and sample bit depth?

Calculate the file size in kB of a 2-minute sound recording that has a sample rate of 2000 Hz and a sample bit depth of 6 bits.

Calculate the file size in kB of a 3-minute sound recording that has a sample rate of 1000 Hz and a sample bit depth of 2 bits.

the number of bits used to represent sound

a measure of a sound wave at a point in time

converting sound waves into air vibrations

increasing the resolution of a sound file

the number of bits used to represent a sample

What does bit depth in sound sampling refer to?

measure the sound wave at a point in time

convert the measurement into a binary sequence

Put these steps in the correct order to digitise sound:

What is the term used to describe the number of bits used to represent a sound sample?

Calculation of sound file sizes

Lesson outcome