RECOMMENDATION UIT-R BS.562-3 - Subjective assessment of sound quality
1 that the grading scales given below should be used for the subjective assessment of ...
    1.1 Five-grade quality and impairment scale
    1.2 Seven-grade comparison scale
2 Presentation of results
ANNEX 1
1 General
2 Selection of listening panel
3 Test procedure and duration
4 Choice of programme sequences
5 Choice of reproduction device
6 Sound level
    6.1 Loudspeaker reproduction
    6.2 Headphone reproduction
7 Listening conditions
    7.1 Loudspeaker reproduction
    7.2 Headphone reproduction
8 Assessment of special characteristics of equipment*, programmes, studios, etc.
    8.1 Protection ratios
    8.2 Recorded programmes, studios
    8.3 Applications of subjective assessment of sound quality
9 Subjective assessments of multi-dimensional sound systems