The Need for Digital Sound (2 marks)
Explain why sound, which is an analogue signal, must be converted to digital form before a computer can process it.
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AQA (8525)
Sampling Rate (2 marks)
Describe the term ‘sampling rate’ in the context of digital audio.
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Advantages of Unicode over ASCII (4 marks)
Describe two advantages of using Unicode over ASCII for character encoding.
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Pixels (2 marks)
Explain what a pixel is and how it relates to the way an image is displayed on a screen.
Bitmap File Size Calculation (3 marks)
A bitmap image has a width of 800 pixels and a height of 600 pixels. If the colour depth is 24 bits, calculate the file size in bytes.
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Adding Binary Bytes (3 marks)
Add the following 8-bit binary numbers (bytes): 11011100 and 10100101. Provide the final sum in binary form.
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Character Set Definition (2 marks)
Define the term ‘character set’ and explain the purpose of Unicode as a character encoding method.
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Bytes to Kilobytes (2 marks)
A file has a size of 2048 bytes. Express this size in kilobytes.
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Giga vs Gibi (4 marks)
When a storage device is advertised as having a capacity of 2 gigabytes (GB), this might actually refer to gibibytes (GiB) since these terms are sometimes used interchangeably but incorrectly so. Explain whether the advertised capacity will appear larger, smaller, or the same when measured in gibibytes (GiB), and justify your answer based on the
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Units (4 marks)
Convert the following quantities of bytes into the largest whole unit possible and express the result as a whole number: 1,500,000 bytes and 12,000,000 bytes. State the unit and the corresponding value.