A statement indicating there is an implied reference was added. The appendix states that various laboratories have shown that independent subjective audio and video assessments can be used to predict combined audiovisual quality. It also states that video dominates when the distortions are of the same comparable level. Prior to the experiments described in Com 12-61, France Telecom had objected to annex status of this information. Another appendix is intended to list audiovisual test sequences.
None are presently available.
This is essentially the SG12 version of ITU-R BT.500. Video classes as defined at VQEG and adopted for P.911 are added. The highest class considered by this document is TV3, that includes broadcast emission to the home. Viewing distance has a wide range from 1 to 8 picture heights to be selected based on the application. Other viewing conditions were also changed to match P.911.