録音 and 録画: Wave Sounds for a Video and Recorded Footage
Compare wave audio used in a video and a meeting recording with recording a presentation and reviewing recorded video. Follow sound versus video and the later use, listening, or review.
Recorded sound and its later use
録音 (ろくおん) means audio recording. 「波の音を録音して映像の背景に使った。」 — “I recorded the sound of the waves and used it as background audio for the video.” The recorded object is the sound of the waves, which was used as background audio for a video. The action is not described as filming the waves.
「会議の録音を聞き直して議事録をまとめる。」 — “I listen back to the meeting recording while preparing the minutes.” This sentence describes listening back to a meeting recording while preparing the minutes. The nonpast まとめる does not state that preparation of the minutes has already been completed.
A presentation recorded and a video reviewed
録画 (ろくが) means video recording. 「発表会を録画しました。」 — “We recorded the presentation.” The presentation was recorded as a past action.
「録画した映像を皆で確認した。」 — “We reviewed the recorded video together.” The object reviewed together in this example is the recorded video. 録画した modifies 映像, keeping the recorded object distinct from the later review action.
Distinguish targets within the gloss recording
Both words have recording as their English gloss, but the wave sounds and meeting recording concern audio, while the presentation and recorded video concern video. The common gloss does not erase those different targets.
Follow the actions too. Wave sounds were recorded and used as background audio; a meeting recording is listened to while minutes are prepared. Recording the presentation and reviewing a recorded video are also separate actions stated in their respective examples.
Is the video itself what was recorded with 録音 in 「波の音を録音して映像の背景に使った。」?
Show the answer and why
No. The wave sounds were recorded and used as background audio for the video. Distinguish the audio target of 録音 from the video target of 録画; their shared English gloss recording does not turn those sounds into footage of the waves.