Fact · Languages and accents
Azure Speech returns one of the languages you supplied, even when none of them is spoken in the audio.
Checked against its source on October 17, 2026
In the source's own words
“The Speech service returns one of the candidate languages provided even if those languages weren't in the audio.”
Implement language identification (Azure Speech, Microsoft Learn), Microsoft, Microsoft Learn, 2026, Candidate languages.
Open the original- What it measures
- An app that offers a wrong candidate list will receive a wrong language label with no warning from the detector itself.
- What it does not show
- The sentence describes the design. It does not measure how often a wrong label results.