Starter quiz
- When you change the resolution of an image in image editing software, what are you actually changing?
- the number of colours in the image
- the size of the image file on your computer
- the physical dimensions of the image, increasing the height and width
- the number of pixels that make up the image ✓
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- When you change the physical dimensions of an image in an image editor by increasing its height and width, what happens to the image?
- the resolution increases, so it becomes more detailed
- the image stays the same size, but the file size increases
- the pixels increase in size ✓
- the number of pixels increases
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- What is the purpose of zooming in on an image in an image editor?
- to make the image file size larger
- to see the image in more detail ✓
- to change the colours in the image
- to make the image blurry
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- What does it mean to 'export' an image in an image editor?
- to open the image in a different program
- to save the image in a specific file format ✓
- to print the image
- to delete the image from the computer
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- What is a common use of artificial intelligence (AI) in image editing?
- to print the image
- to enhance or restore old photographs ✓
- to create physical paintings from digital images
- to make images load faster on websites
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- Which of the following is a potential concern about AI to create art?
- AI art can be too creative and original.
- AI art is always low quality and not visually appealing.
- AI art can be difficult to distinguish from human-created art. ✓
- AI art cannot be used for commercial purposes.
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Exit quiz
- What is the purpose of a microphone in digital audio?
- to convert sound waves into electrical signals ✓
- to display sound waves visually
- to store sound waves as digital files
- to play back digital sound
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- What does 'sample rate' refer to in digital audio?
- the number of speakers used to play a sound
- the volume of the sound being recorded
- the number of sound samples taken per second ✓
- the length of the sound file
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- What does changing the sample resolution (bit depth) change in a digital audio file?
- the length of the sound recording
- the number of channels in the audio
- the accuracy of the sound wave's representation ✓
- the type of file format used to store the sound
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- What is a channel in digital audio?
- a single stream of audio used to reproduce sound ✓
- the frequency of a sound wave
- the volume level of a sound
- the type of microphone used to record the sound
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- If you increase the sample rate of a digital audio recording, what is the effect on the sound quality and file size?
- The sound quality will decrease, and the file size will decrease.
- The sound quality will increase, and the file size will increase. ✓
- The sound quality will increase, and the file size will decrease.
- The sound quality will decrease, and the file size will increase.
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- Why might a musician choose to record their music in stereo instead of mono?
- to make the recording louder
- to create a richer and more immersive listening experience ✓
- to reduce the file size of the recording
- to make the recording easier to edit
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Sounds are represented as sequences of bits.
- Sample rate is the number of sound samples taken per second.
- Sample resolution (bit depth) is the number of bits used to represent each sample.
- Changes to sample rate and sample resolution (bit depth) affect the file size and quality of a sound file.
Common misconception
A single audio file contains only one channel of sound.
Many formats (e.g., stereo or surround sound) contain multiple channels within one file. The information contained in the audio track can be reproduced on separate channels.
Keywords
Sample - a single measurement of an analogue signal, typically sound
Sample rate - the number of samples captured per second
Sample resolution (bit depth) - the number of bits used to store each sample, which determines how accurately the sample is represented
Channel - a single stream of audio used to reproduce sound
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