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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Pearson Edexcel (2020)
Sound Representation (6 marks)
Describe the entire process of how analogue sound is represented in binary, referring specifically to amplitude, sample rate, bit depth, and sample interval.
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Limitations of Binary Representation (3 marks)
Describe a scenario where the limitations of binary representation are evident when using a fixed number of bits. Explain the implications of these limitations in the context of digital audio sampling.
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Binary Representation Limitations (4 marks)
A graphic design program uses 24 bits to store the colour of a pixel in an image, with 8 bits for each of the red, green, and blue components. Discuss the limitations this system may encounter if the program were to support a wider range of colours or shades, and how this might affect the
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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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Sample Rate (2 marks)
Define ‘sample rate’ and describe its importance in the digital representation of sound.
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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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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 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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Why replace ASCII? (3 marks)
Why was 7-bit ASCII replaced by extended ASCII and Unicode?
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