1、HTTP:/WWW.ITU.INT/DMS_PUB/ITU-R/OPB/QUE/R-QUE-SG06.2-2001-MSW-E.DOC 18.09.03 15.07.10Radiocommunication Study Group 6QUESTION ITU-R 2/6Audio metering characteristics suitable for use indigital sound production*(2001)The ITU Radiocommunication Assembly,consideringa) that Recommendation ITU-R BS.645 s
2、pecifies metering characteristics for analogue soundprogrammes;b) that modern digital sound transmission techniques offer an extremely wide dynamic range;c) that digital media overload abruptly and thus even momentary overload should be avoided;d) that listeners desire audio programmes to be uniform
3、 in subjective sound level;e) that current knowledge of human psychoacoustics may make it possible to create ametering algorithm that would provide for indication of perceived loudness;f) that the state of digital signal processing makes it practical to implement complexalgorithms into cost-effectiv
4、e devices,decides that the following Question should be studied1 What audio metering characteristics should be used to provide an accurate indication ofsignal level in order to assist the operator to avoid overload of digital media?2 What audio metering characteristics should be used to provide accu
5、rate indication ofsubjective programme loudness?3 What display characteristics should be employed to most effectively indicate the meteredvalues to the operator?4 What method should be employed to evaluate the effectiveness of the metering and displaycharacteristics that might become the subject of
6、a Recommendation(s)?further decides1 that the results of the above studies should be included in (a) Recommendation(s);_* In view of the anticipated digital nature of the entire broadcast chain, it is believed the samecharacteristics would apply throughout the chain.INTERNATIONAL TELECOMMUNICATION UNIONRADIOCOMMUNICATIONSTUDY GROUPSDocument 6/1-E8 June 2003Original: English- 2 -6/1-EHTTP:/WWW.ITU.INT/DMS_PUB/ITU-R/OPB/QUE/R-QUE-SG06.2-2001-MSW-E.DOC 18.09.03 15.07.102 that the above studies should be completed by 2005._
