ITU-R BR 1385-1998 Exchange of sound programmes on recordable compact discs (CD-R)《可录制的CD的声音节目交换》.pdf
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1、Rec. ITU-R BR.1385 1RECOMMENDATION ITU-R BR.1385*EXCHANGE OF SOUND PROGRAMMES ON RECORDABLECOMPACT DISCS (CD-R)(Question ITU-R 215/10)(1998)Rec. ITU-R BR.1385The ITU Radiocommunication Assembly,consideringa) that the exchange of sound programmes on recordable compact discs (CD-R) is becoming common
2、practice;b) that CD-R equipment is widely available and at low cost;c) that the compatibility with existing CD players must be guaranteed;d) that the alignment levels should be compatible with that of commercial CDs;e) that alignment tones are a very useful means for equipment set up,recommends1 tha
3、t if CD-R discs are supplied for programme exchange, they should conform to the requirements given inAnnex 1.ANNEX 1Exchange of sound programmes on recordable compact discs (CD-R)1 Discs1.1 SpecificationThe CD-R must be recorded according to the “Red Book” standard IEC 60908 1987, Amendment 1, 1992
4、and Amendment 2,1998 “Compact disc digital audio system”.1.2 Quality of the supportBlank discs should be good quality and there must be no obvious surface defects on the blank or recorded disc. (See alsosection 2.1 below.)1.3 ProtectionThe disc must be supplied in an undamaged “Jewel Case”.1.4 Recor
5、ding levelRecordings should be made such that the Permitted Maximum Level, PML, is 3 dBFS (dB Full Scale). (See alsoAppendix, section 1)._*This Recommendation should be brought to the attention of the International Electrotechnical Commission (IEC).2 Rec. ITU-R BR.1385NOTE If the programme material
6、is transferred from a DAT tape, recorded according to EBU Recommendation R64 1992 “Exchange of sound programmes as digital audio tape recordings”, the change in level and other processingdescribed in Appendix, section 2 will be necessary.Other recording levels should be used by prior agreement only.
7、1.5 Line-up toneIt is preferable that the first track of the disc should contain an alignment tone. This should be 30 s of 1 kHz tonerecorded on both channels at Alignment Level, as shown in Table 1.The left and right channels may be differentiated by using an interrupted tone on the left channel, a
8、s specified in EBURecommendation R49 1993 “Tape alignment leader for the exchange of television programmes”.Alignment Level should be 9 dB below PML, that is 12 dBFS, (actually 12.04 dBFS, corresponding to a ratio of 1:4).TABLE 1Digital codes for maximum levels and alignment levels1.6 EmphasisNo pre
9、-emphasis shall be used.1.7 TracksA continuous programme should occupy a single track. If the programme is in sections, then individual sections shouldoccupy separate, consecutively numbered, tracks.2 Accompanying information2.1 LabelsAll CDs and cases should be clearly labelled, indicating programm
10、e details. To avoid possible damage to the disc, itmust only be labelled using methods in accordance with the manufacturers instructions.2.2 Track informationTrack numbers must be documented, along with accurate timings of the programme and sections where appropriate.2.3 Recording reportA completed
11、recording report should accompany all programmes.Maximum coding level (0 dBFS) Audio alignment levelNegative peaks Positive peaks Negative peaks Positive peaks8 000 7FFF E000 1FFFRec. ITU-R BR.1385 3APPENDIX1 Recording levelIn making a CD-R, the aim is to produce a disc that is level compatible with
12、 commercial CDs. Experience has shownthat if the output level of a CD player is set so that 0 dBFS reads “+12” on a IEC type IIb Peak ProgrammeMeter (PPM), then, on average, audio signals from commercial CDs will peak to “+9”. In practice, this works well, andreduces the need for manual level adjust
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