Editing Mean Opinion Score (section)

=== Testing Procedures ===

Traditional MOS testing involves several key steps:

# '''Subject Selection''': Recruiting appropriate test participants, typically naive listeners without specialized training in audio quality assessment
# '''Environment Control''': Conducting tests in acoustically controlled environments meeting ITU-T specifications
# '''Stimulus Presentation''': Playing audio samples to subjects in randomized order to minimize bias
# '''Rating Collection''': Having subjects rate each stimulus on the chosen scale
# '''Statistical Analysis''': Calculating the arithmetic mean and confidence intervals for each stimulus

Modern extensions include comparative methods such as:

* '''Degradation Category Rating''' (DCR): Subjects compare processed audio to a reference
* '''Comparison Category Rating''' (CCR): Direct comparison between two stimuli