IPA IP 2020 Question 22
A question IPA Japan published in 令和2年度 10月 ITパスポート試験 公開問題 問22, translated into English. ITPEC is based on the same exams.
Same question on ITPEC: Apr 2026 Q91
The fields of utilization of AI include voice recognition, image recognition, and natural language processing. Which of the following is the most appropriate example of a system that uses both voice recognition and natural language processing?
Explanation
Interpreting spoken questions about the weather or traffic and answering with suitable content — the only system that needs both voice recognition and natural language processing.
The system first uses voice recognition to turn the person's speech into text, then natural language processing to work out what is being asked and to compose or choose an appropriate answer. This is how a smart speaker or voice assistant works.
Answer (b)
Why not others:
- •(a) — detecting a knock is sound detection and recognizing a face is image recognition; no spoken language is understood
- •(c) — detecting people's figures and voices to count visitors uses image and sound detection only; what the people say is never interpreted
- •(d) — reading printed English through a camera is image recognition (character recognition), then summarizing and translating it is natural language processing; there is no voice input
Key rule: Voice recognition turns speech into text; natural language processing understands the meaning of that text. A spoken dialogue system needs both.
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This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.