Text, sound and images all have to be converted into binary before a computer can store them. This topic explains character sets, comparing ASCII with Unicode and why Unicode was needed. For images, you will cover pixels, resolution and colour depth, and how these affect both image quality and file size. For sound, the topic covers sampling, sample rate and sample resolution, and the trade-off between accuracy and file size. Calculating file sizes from these values is a common exam question.
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