Bit Depth (2 marks)
What is ‘bit depth’ in the context of sound and why is it significant when converting analogue sound to binary?
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Questions
Sample Rate (2 marks)
Define ‘sample rate’ and describe its importance in the digital representation of sound.
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Amplitude and Sound (2 marks)
Explain the term ‘amplitude’ in the context of representing analogue sound in binary.
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Colour Depth Implication (3 marks)
Explain the effect of increasing the colour depth on the file size and image quality of a bitmap image, providing two implications for each.
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Calculating Image Size (4 marks)
Calculate the file size of an uncompressed bitmap image that has a resolution of 1024×768 pixels and a colour depth of 24 bits. Provide your answer in the most sensible unit of measurement (bytes, kilobytes, or megabytes).
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Colour Depth (3 marks)
A bitmap image uses a colour depth of 8 bits. Explain the implication of this in terms of the colour range available for each pixel in the image.
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Binary Representation of Images (2 marks)
Describe how a single pixel is represented in binary within a bitmap image.
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Pixels and Resolution (1 mark)
Explain what is meant by the term ‘resolution’ in the context of bitmap images.
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Why replace ASCII? (3 marks)
Why was 7-bit ASCII replaced by extended ASCII and Unicode?
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The ASCII Character Set (2 marks)
Describe how the ASCII encoding scheme works.
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