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Year 10 - Computing

Representation of sound

Representation of text, images and sound

Unit Summary

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.

Lesson Summary

You will learn to describe how computers represent sound.

Key Notes

  • Sound is a pressure wave that causes the air to vibrate.
  • A sound sample is a measure of a sound wave at a point in time.
  • Samples of sound are digitised using a specified bit depth so they can be processed by a computer.
  • Sample rate is a measure of the number of samples taken each second.

Vocabulary To Learn

  • sample: the measurement of a sound wave at a point in time
  • digitisation: converting data to a binary sequence
  • bit depth: the number of bits used to represent a sample
  • sample rate: the number of samples captured per second

Common Mistakes To Avoid

  • The sample rate and bit depth of samples adjusts based on the sound that is being digitsed.

3 Quick Questions (With Answers)

1. Describe the system or process from this lesson in clear steps.

Sound is a pressure wave that causes the air to vibrate. A sound sample is a measure of a sound wave at a point in time.

2. Define this computing term and give one practical example. 'sample'

the measurement of a sound wave at a point in time. Add one real device or system example to prove understanding.

3. Correct this common computing misconception.

Mistake: The sample rate and bit depth of samples adjusts based on the sound that is being digitsed. Correction: The digitsation of sound needs to be consistent so that the binary sequence represented can be processed as expected.

More Lessons In This Unit

Browse all guides in the Year 10 Computing guide library.