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An organisation that supplies audiobooks over the internet is moving into a new office building - Edexcel - GCSE Computer Science - Question 3 - 2018 - Paper 1
Question 3
An organisation that supplies audiobooks over the internet is moving into a new office building. (a) One reason for networking devices is to provide access to the i... show full transcript
Worked Solution & Example Answer:An organisation that supplies audiobooks over the internet is moving into a new office building - Edexcel - GCSE Computer Science - Question 3 - 2018 - Paper 1
Step 1
Step 2
Step 3
Explain why data loss is acceptable when using lossy compression.
Answer
Data loss can be acceptable because certain audio frequencies that are not perceivable to human ears may be removed without significantly affecting the user experience. This is especially true for audiobooks where the content remains understandable despite the compression.
Step 4
Explain why RLE may NOT be a good choice for encoding a text file.
Answer
RLE may not be suitable because text files often contain a variety of characters and patterns that do not have long runs of repetition. This could result in a larger file size when using RLE compared to the original text.
Step 5
Construct an expression to show how many seconds it will take to transmit the audiobook file.
Answer
To calculate the time, first convert 81 MB to bits: 81 MB = 81 * 1024² bytes * 8 bits/byte. Then, using the transmission speed of 54 Mbps:
Total bits to transfer = 81 * 1024^2 * 8 bits
Speed = 54 * 10^6 bits per second.
Time (seconds) = Total bits / Speed.