1.2. Text, sound and images
A subsection of Computer Science, 2210, through 1. Data representation
Listing 6 of 6 questions
A student has a sound file that is too large to be stored on their external secondary storage device. The student compresses the sound file to make the file size smaller. The compression method used reduces the sample rate and the sample resolution of the sound file. State what is meant by the sample rate and sample resolution. Sample rate Sample resolution Identify which type of compression has been used to compress the sound file. The student sends the sound file to a friend. The file is transmitted across a network that uses packet switching. Identify two pieces of data that would be included in the header of each packet. Explain how the file is transmitted using packet switching.
2210_s23_qp_11
THEORY
2023
Paper 1, Variant 1
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A band is recording their new song. They need to consider the sample rate and sample resolution of their recording. Give one benefit of using a higher sample rate to record the song. Give one drawback of using a higher sample rate to record the song. Describe what is meant by sample resolution. The band wants to compress the sound file, but they do not want any data to be permanently removed. Identify the compression method that should be used.
2210_w23_qp_12
THEORY
2023
Paper 1, Variant 2
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Passengers fly into an airport from other countries. The airport has a security system that uses: • computers • scanners • digital cameras To gain entry to the country, each passenger must have a passport or identification (ID) card. This must contain a recent photograph and other personal data. The passenger must: • place their passport or ID card on a scanner that reads machine-readable characters and scans the photograph • look towards a camera that takes an image of the passenger’s face Describe how a computer checks whether the image just taken by the camera matches the scanned photograph.
2210_w15_qp_13
THEORY
2015
Paper 1, Variant 3
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An electronic game has three square mats that are coloured red, green and blue. The player will see a colour displayed on a screen and has 1 second to hit the mat that matches the colour. If the player hits the correct mat, within 1 second, a counter is incremented. When a player hits an incorrect mat, the game ends. The game uses sensors and a microprocessor to determine if the player hits the correct mat within 1 second. Explain how the game uses sensors and a microprocessor to count the number of times a player hits a correct mat within 1 second.
2210_w21_qp_12
THEORY
2021
Paper 1, Variant 2
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A photographer takes an image with a digital camera. The photographer sets the resolution and colour depth for the image. State what is meant by the image resolution. State what is meant by the image colour depth. Give one benefit of increasing the colour depth of the image. The photographer compresses the image using a method that permanently reduces the colour depth and resolution of the image. Identify which compression method the photographer uses. One benefit for compressing the image is to reduce the storage space it uses. Give two other benefits of compressing the image.
2210_w23_qp_13
THEORY
2023
Paper 1, Variant 3
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Questions Discovered
6