ACR tests average five-point ratings into a mean opinion score

Evidence

The absolute category-rating (ACR) test requires listeners to respond with a rating from the five-point ACR rating scale shown in Table 7.2. The results from all the listeners are averaged to provide a mean opinion score (MOS) for the signals under test. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2371

Categorization

Category: Definitional Content

• DEFINE: Defines ACR testing and the mean opinion score (MOS) — foundational vocabulary for reading any speech-quality study.

Related

• Absolute category-rating tests average listener ratings into a mean opinion score. (similarity 0.96)
• Comparison category-rating tests measure whether processing improves or degrades audio. (similarity 0.81)
• Comparison category-rating tests measure whether processing improved or worsened a signal (similarity 0.80)

Broader Connections

• Absolute category-rating tests yield a mean opinion score #expands (0.95) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2388