Year 9
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Lesson details
Key learning points
- In this lesson, we will revisit the digitisation process, in order to understand how the sampling rate and the sample size affect the size and quality of the representation. We will also use a sound editing program.
Content guidance
- Contains external content.
Supervision
Adult supervision recommended
Licence
This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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5 Questions
Q1.
Samples taken in a second is called .................................
Sample size
Sound wave
Q2.
Number of bits in each sample is called ..............
Binary
Sample
Q3.
An advantage of taking samples for every 5 minutes, instead of every 10 minutes is .................................
Increased sample size
Increased storage
Q4.
One of the disadvantage of taking samples for every 5 minutes, instead of every 10 minutes is .................................
Increased audio quality
More sound waves
Q5.
Assume that you have a digital recording of a sound. The duration is 2 seconds. The sampling rate is 4,000 samples per second. The sample size is 2 bytes per sample. Use this information to compute the number of bytes required to represent this sound. You may need to use a calculator for this task.
22,000 bytes
8,000 bytes