PowerPoint Presentation

Digital DetectivesLesson 4: Manipulating Sound

IntroductionLast lesson we learned how to manipulate/fake images. Sounds can be manipulated or faked, too.

READ the Introduction and Step 4.1 on page 7 of your Student Book.

ObjectivesKnow that information can be presented and manipulated in a variety of ways, and that this can lead to misunderstanding or deceptionUnderstand how to edit pre-recorded sounds Be able to manipulate sound using Audacity in a variety of different ways

Starter (5 mins)Listen to the three sound files (CD Resource 4a). Can you spot the difference between the recordings?

Audacity Demo (2 mins)Import sound filesCutting & Pasting sound

Task 1 (in pairs) 10 minsComplete Step 4.2 and 4.3, remembering to save your sound file!

Mix up the route, by editing the recording and cutting & pasting the place names.

Follow the instructions in your book carefully.

Task 2 (in pairs) 5 minsListen to CD Resource 4b File Intercept 2.

Why does it sound strange?How has it been changed?

Use the Effect Tool to change the sound back to its correct version.

Task 3 (in pairs) 10 minsComplete Step 4.6. This task allows you to explore the ability to change pitch in Audacity. Listen to CD Resource 4b File Intercept 3.

Why does it sound strange?How has it been changed?

Use the Pitch Control to change the pitch so that you can understand the message.

ExtensionTry Step 4.7.

Experiment with some of the other effects and create another sound file that is disguised in some way.

Glossary TermsDefine the following terms in your ICT Dictionary:

PitchWaveformEchoReverse