ITU-R BR 1694-2004 Videocassette recording formats for international exchange of large-screen digital imagery programmes intended for presentation in a theatrical environment《应用于剧院.pdf
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1、 Rec. ITU-R BR.1694 1 RECOMMENDATION ITU-R BR.1694 Videocassette recording formats for international exchange of large-screen digital imagery programmes intended for presentation in a theatrical environment (Question ITU-R 15/6) (2004) The ITU Radiocommunication Assembly, considering a) that Recomme
2、ndation ITU-R BT.1666 identifies broad user requirements and presentation quality targets for large-screen digital imagery (LSDI) applications intended for presentation in a theatrical environment; b) that Recommendation ITU-R BT.1680 identifies the image systems specified in Recommendations ITU-R B
3、T.709 and ITU-R BT.1543 as appropriate for the distribution of LSDI programmes for presentation in a theatrical environment (see Note 1); c) that the 5.1 reference sound system (five independent channels plus an optional low frequency extension channel), specified in Recommendation ITU-R BS.775 as t
4、he highest level in a hierarchy of multichannel sound systems, meets the requirements for presentation of LSDI applications in a theatrical environment; d) that Recommendation ITU-R BT.1662 specifies a reference chain for LSDI applications, and it identifies a need for some quality headroom on LSDI
5、programme masters, with respect to the quality required on programme presentation; e) that this quality headroom can be used to apply some bit-rate reduction in the distribution of LSDI programmes, on condition that the presentation should remain visually transparent to the master quality at the vie
6、wing distance envisaged for the application; f) that Recommendation ITU-R BT.1666 also foresees the implementation of an international exchange of LSDI programmes (see Note 2) through the use of recorded media; g) that Recommendation ITU-R BR.1375 recognizes that the two videotape recording formats
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