Comparison category-rating tests measure whether processing improves or degrades audio.

Evidence

In situations where the processed signal could be evaluated as being either better or worse, a comparison category-rating (CCR) test can be used. Its rating scale is shown in Table 7.3 and it can be seen that it is a symmet­ ric two-sided scale. Listeners are asked to rate the two signals presented in terms of the quality of the second signal relative to the first. The CCR test might be used if one is interested in the effect of a signal processing meth­ odology being applied to an audio signal, such as noise reduction, in terms of whether it has improved the original signal or not. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2378

Categorization

• DEFINE: Defines the CCR test and when it’s used vs the ACR/DMOS tests.