Understanding Digital Sound (4 Marks)
Explain how analogue sound is converted into digital form. Your answer should include an explanation of the terms “sampling” and “bit depth”.
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Data Representation
Effects of Changing Resolution and Colour Depth (4 marks)
A digital image with a resolution of 800×600 pixels has its resolution doubled and its colour depth increased from 8 bits to 16 bits per pixel. Discuss the impact these changes will have on the quality and file size of the image.
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Image Resolution (3 marks)
Define image resolution and explain how increasing the resolution affects both the quality of an image and its file size.
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Colour Depth (3 marks)
Describe what is meant by the term ‘colour depth’ in digital images and how increasing the colour depth affects the image quality and file size.
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Metadata in Images (2 marks)
What is metadata in the context of digital images, and give two examples of information it might contain.
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Understanding Binary Representation of Images (2 marks)
Explain how an image is represented using pixels and binary code.
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Understanding Character Sets and Bits (4 Marks)
How does the number of bits per character in a character set influence the number of unique characters that can be represented? Provide examples from ASCII and Unicode.
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Character Sets (3 Marks)
Define ‘character set’ and compare ASCII and Unicode in terms of character capacity and global applicability.
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Binary Representation of Characters (2 Marks)
Explain the process of representing characters in binary and discuss why different character sets may use varying numbers of bits.
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Explaining Overflow Errors (2 marks)
Explain what is meant by an overflow error when adding two binary integers. Provide an example with an 8-bit binary addition that results in an overflow.
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