ITPEC IP April 2018 Question 3
ITPEC IP April 2018 — Question 3 of 100
The data must be compressed to at most one eighteenth of its original size, so the minimum factor is 18. The raw rate is 500 x 400 x 30 x 3 = 18,000,000 bytes per second. The connection carries only 1,000,000 bytes per second, requiring a compression ratio of 18,000,000 / 1,000,000 = 18.
Answer (a)
Why not others:
- 54, 72, and 144 would compress more than necessary
- the question asks for the minimum value that brings the required transfer rate down to the available rate
Key rule: Required video rate equals pixels per frame × frames per second × bytes per pixel; divide it by link capacity to find the minimum compression factor.
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