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Table 4 Top four results from Soundwalks data set for text-based retrieval with out of vocabulary query "rail". Parenthetical descriptions are not actual tags, but provided to give an idea of the acoustic content of the sound files.

From: An Ontological Framework for Retrieving Environmental Sounds Using Semantics and Acoustic Content

Posterior probability

Node path

Relevant

0.19

railtrainsegment94.wav (train bell)segment165.wav (traffic/train horn)

No

0.17

railvoicesegment136.wav (pa announcement)segment133.wav (pa announcement)

Yes

0.15

railtrainsegment40.wav (train brakes)segment30.wav (train bell/brakes)

Yes

0.09

railtrainsegmen40.wav (train brakes)segment147.wav (train horn)

Yes