A localized P.808 ACR listening-test pipeline for four languages is described, and URGENT 2025 analysis shows that subjective MOS and reference-free metrics can miss hallucinations, motivating additional phone-fidelity checks.
P .808: Subjective Evaluation of Speech Quality with a Crowd- sourcing Approach, International Telecommunication Union, Telecom- munication Standardization Sector (ITU-T), Jun
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P.808 Multilingual Speech Enhancement Testing: Approach and Results of URGENT 2025 Challenge
A localized P.808 ACR listening-test pipeline for four languages is described, and URGENT 2025 analysis shows that subjective MOS and reference-free metrics can miss hallucinations, motivating additional phone-fidelity checks.