Degradation category-rating tests evaluate processed signals against the unprocessed original.

Evidence

A comparison is requested of listeners in a degradation category-rating (DCR) test, and this usually involves a comparison between a signal before and after some form of processing has been carried out. The assumption here is that the processing is going to degrade the original signal in some way, for example after some sort of Table 7. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2389

Categorization

• DEFINE: Explains the DCR test design and its core assumption about processing as degradation.