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1.2. Multimedia Sound
A subsection of Computer Science, 9618, through 1. Information representation
Listing 3 of 3 questions
A mobile telephone is used to record a video. The mobile telephone has a touchscreen. There are different types of touchscreen. Complete the description of the principal operation of touchscreens. A touchscreen has two layers. When the user touches the screen, the layers touch and a is completed. A touchscreen has several layers. When the top layer is touched, there is a in the electric current. A microprocessor identifies the of the touch. The mobile telephone uses a built-in digital camera to record the video. The digital camera automatically focuses on the faces of people. Explain how Artificial Intelligence (Ais used by the camera to automatically focus on the faces of people. The video includes a sound recording. Describe how sound is represented in a computer. A second video is recorded. The sound in the second video needs to be more precise. Explain the reasons why increasing the sampling rate and the sampling resolution will improve the precision of the second recording. Sampling rate Sampling resolution
9618_s23_qp_13
THEORY
2023
Paper 1, Variant 3
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A digital audio message needs to be recorded. Tick () one box in each row to identify the effect of each action on the accuracy of the recording. Action Accuracy increases Accuracy decreases Accuracy does not change Change the sampling rate from 40 kHz to 60 kHz. Change the duration of the recording from 20 minutes to 40 minutes. Change the sampling resolution from 24 bits to 16 bits. The audio message is recorded with a sampling rate of 50 kHz and a sampling resolution of 16 bits. The recording is 20 minutes in length. Calculate the file size of the recording. Give your answer in megabytes and show your working. Working Answer megabytes A computer uses a buffer when playing the audio message. Explain the purpose of a buffer in a computer system using one other example.
9618_w22_qp_13
THEORY
2022
Paper 1, Variant 3
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Questions Discovered
3