OCR Computer Science 1-9: - Data Representation Lesson 4 – Check digit, sound and compression

Objective: - We’re learning how to apply compression to sound and how to explain check digits.
Students will be given a break down how sound is represented. The teacher will also have some teacher notes and things that they can talk about. I’ve included a worksheet for the end of this task which tests their knowledge of the PowerPoint slides. Where possible, I’ve tried to include a diagram to explain how it works so that it’s more visual for students.

Keywords this lesson:
Analogue
Bit depth
Bit rate
Sample rate
Compression

Topics covered by this presentation:
Analogue to digital compression
Sample rate - number of samples taken when converting to digital.
Bit rate - sample rate x bit depth
Estimating file size
Lossy and lossless compression: - When to use them
Check Digits - Also diagrams to show you how to convert them.

Content written by National Teaching Award winner: - Ray Chambers 2015 - Innovative use of technology.