ITU-R QUESTION 626-1997 Subjective assessment of small medium and large impairments in sound quality《音质中小 中 大损害的主观评价》.pdf

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1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.62-1997-MSW-E.DOC 22.10.03 15.07.10 QUESTION ITU-R 62/6 Subjective assessment of small, medium and large impairments in sound quality (1997) The ITU Radiocommunication Assembly, considering a) that the introduction of new kinds of sound

2、 signal processing such as digital coding and bit-rate reduction, new kinds of television signals using time-multiplexed components and new services such as enhanced television and HDTV, may require new or amended methods of making subjective assessments of the sound quality; b) that since many diff

3、erent methods of subjective testing are possible, it is highly desirable to standardize the methods of subjective testing and the interpretation of the results, so that the best possible comparisons may be made between results obtained at different times and different places; c) that Recommendation

4、ITU-R BS.1116 has established a method for subjective assessment of small impairments in audio systems including multi-channel sound systems; d) that Recommendation ITU-R BS.1116 can be expensive and time consuming to use and so there is a desire for a simplified method that will provide close to or

5、 the same degree of accuracy as Recommendation ITU-R BS.1116; e) that significant inter-laboratory differences in test results can occur; f) that audio systems introducing medium and large impairments are now being deployed, decides that the following Question should be studied 1 What parts of Recom

6、mendation ITU-R BS.1116 can be used to recommend simplified methodology that would maintain an acceptable overall accuracy when assessing small impairments? 2 To what extent the inter-laboratory differences in tests conducted according to Recommendation ITU-BS.1116 can be minimized in the simplified

7、 procedure of 1) and result in suitable amendments to Recommendation ITU-R BS.1116? 3 What suitable procedures should be included in the simplified methodology of decides 1) to provide for the subjective assessment of medium and large impairments in audio systems including multi-channel sound systems? further decides 1 that the results of the above studies should be included in (a) Recommendation(s) and in a suitable revision of Recommendation ITU-R BS.1116; 2 that the above studies should be completed by 2006. _