Compression
Lesson Instructions
Lesson Instructions
Watch and follow the YouTube video, the lesson contains three parts:
Key Information and content - all you need to do here is watch and listen
Learning activity - this activity involves answering different questions about Compression
Consolidation - these are past exam question and are for deliberate practice to check your understanding.
Compression Full Lesson Video.mp4Task - Lossy Vs Lossless
Task - Lossy Vs Lossless
Task - Exam Questions - Deliberate Practice
Task - Exam Questions - Deliberate Practice
Mark Scheme
Mark Scheme
Question 8 (a)
Question 8 (a)
Reduce the size of the file
Transmits more quickly / uses less bandwidth - Accept other advantages to do with sending files.
Question 8 (b) (i)
Question 8 (b) (i)
Lossless compression
The code has to be exactly as it was originally written...
...Or else it will not work
Question 8 (b) (ii)
Question 8 (b) (ii)
Lossy compression
Achieves higher compression / smaller file size / faster streaming than lossless
Video can still be viewed at a lower quality (from the data compressed)