Binary Representation of Characters (2 marks)
Describe how text characters are represented in binary form in a computer system.
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Data Representation
Binary Representation of Numbers (1 mark)
Explain how the binary number system is used to represent numerical data in computers.
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Sound File Calculations (3 marks)
A sound file has a sampling rate of 44.1 kHz and a sample resolution of 16 bits. If the sound is recorded for 5 seconds, calculate the size of the resulting digital sound file in bits.
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Why Compress? (2 marks)
Define data compression and explain why it is often necessary to compress data.
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Run Length Encoding (5 marks)
Describe how run length encoding (RLE) compresses data and give the RLE representation for the following binary sequence: “0001110011”.
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RLE Frequency/Data Pairs (3 marks)
Convert the bitmap representation “1100011111” into RLE frequency/data pairs.
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Sample Resolution (2 marks)
Define ‘sample resolution’ in the context of sound digitisation.
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Advantage and Disadvantage of Increasing the Sample Rate and Resolution (4 marks)
Describe one advantage and one disadvantage of increasing the sample rate and resolution of a digital sound file.
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Effect of Resolution and Colour Depth (4 marks)
A bitmap image is made up of pixels. Describe how changing the number of pixels and colour depth can affect the file size and quality of a bitmap image.
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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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