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# ECHO
ECHO is a paired diagnostic benchmark for turn-taking evaluation in
Chinese real-time spoken dialogue systems. It contains **549 synthesized
audio instances** organized into **300 contrast pairs**. Within each pair,
the overlapping user utterance has the same transcript but appears under
rewritten dialogue contexts, requiring the system to either `YIELD` or
`KEEP` the floor. ECHO evaluates whether overlap-handling decisions depend
on dialogue context rather than insertion-level lexical cues.
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