Data Representation · 4 question types
Past paper frequency (2018 to 2024)
This topic accounts for approximately 4% of your exam marks.
File size calculations and lossless vs lossy compression are regular 3 to 4 mark questions.
These formulas were introduced in topic 2; they appear constantly in topic-3 questions too.
(bits) = sample rate (Hz) × sample resolution (bits) × duration (seconds)
file size (bits) = image width (pixels) × image height (pixels) × colour depth (bits per pixel)
Calculating a sound file size
A music clip is recorded at a sample rate of 44 000 Hz with a sample resolution of 16 bits for a duration of 10 seconds.
Solution: