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Questions and Answers
What is digitised sound?
It is an analogue recording converted into a digital format.
Which of the following are examples of digital audio? (Select all that apply)
What method is used to convert analogue sound to digital sound?
Sampling
What is the standard sample rate for high-quality audio?
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What is the standard bit depth for high-quality audio?
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Stereo audio contains a single channel of audio.
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The x axis of a visual sound waveform represents ______.
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The y axis of a visual sound waveform represents ______.
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What is the difference between compressed and uncompressed audio files?
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What could be a limitation when recording audio?
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Study Notes
Digitised Sound
- Analogue sound is converted to digital by sampling.
- Sampling records a digital version of the sound at regular intervals.
- Shorter intervals mean more accurate recordings.
Sample Rate and Bit Depth
- Sample rate is the number of samples per second.
- A higher sample rate creates a more accurate recording.
- Standard sample rate for high-quality audio is 44,100 Hz.
- Bit depth is the number of bits used to store each sample.
- A higher bit depth increases quality.
- Standard bit depth for high-quality audio is 16 bits.
Visual Sound Waveform
- X axis represents time in seconds (frequency).
- Y axis represents amplitude or loudness of the sound.
Mono and Stereo
- Stereo contains two audio channels.
- Mono contains a single channel of audio.
- Stereo is higher quality but results in larger file size.
Audio File Types
- Uncompressed audio saves sound exactly as recorded.
- Compressed audio uses algorithms to reduce file size.
- Compressed audio may remove inaudible elements.
Calculating an Uncompressed Audio File Size (Not provided in text, but inferred based on the topic of the lesson)
- File size is determined by:
- Sample rate
- Bit depth
- Number of channels
- Duration of the audio
- Formula for calculating file size: (Sample Rate * Bit Depth * Number of Channels * Duration) / 8 = File Size (in bits)
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Description
This quiz covers the fundamental concepts of digitized sound, including sampling, sample rate, and bit depth. It also explores audio file types and the differences between mono and stereo sound. Test your knowledge on how these elements contribute to audio quality and recording standards.
