MOSarvoja

MOSarvoja, the Finnish term for mean opinion score values, refers to numeric ratings of perceived quality assigned by human listeners to audio, video, and multimedia services. MOSarvoja are typically collected in controlled subjective tests and expressed as an average score on a five-point scale, where 5 indicates excellent quality and 1 indicates poor quality. In practice, tests may use a 1–5 scale with 1 = bad, 2 = poor, 3 = fair, 4 = good, 5 = excellent, and sometimes include decimal scores to reflect closer estimates.

MOSarvoja are derived from subjective evaluations according to ITU recommendations, such as ITU-T P.800 for speech quality and P.910 for multimedia quality, using methods like absolute category rating or paired comparisons. A panel of listeners rates each sample; scores are averaged to yield the MOSarvo for a condition. For robust results, tests specify environmental controls, sample content, and panel size.

Organizations use MOSarvoja to benchmark codecs, transmission paths, or devices, set service targets, and compare configurations. They are widely used in telecom, streaming, and video-conferencing industries to communicate quality in service-level agreements and product development.

Because MOSarvoja are subjective, they depend on listener characteristics and content. Therefore, confidence intervals and DMOS comparisons are commonly used to support decisions.

See also ITU-T P.800, P.910, MOS, PESQ, and DMOS.