1、 Recommendation ITU-R BR.1384-2(03/2011)Parameters for international exchangeof multi-channel sound recordings withor without accompanying pictureBR SeriesRecording for production, archivaland play-out; film for televisionii Rec. ITU-R BR.1384-2 Foreword The role of the Radiocommunication Sector is
2、to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functi
3、ons of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC refere
4、nced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the IT
5、U-R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting ser
6、vice (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite an
7、d fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2
8、011 ITU 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BR.1384-2 1 RECOMMENDATION ITU-R BR.1384-2*,*Parameters for international exchange of multi-channel sound recordings with or without accompanying pi
9、cture*(Question ITU-R 58/6) (1998-2005-2011) Scope Recommendation ITU-R BR.1384 specifies the track assignment, recording characteristics and level alignment for multi-channel audio sound recordings. The ITU Radiocommunication Assembly, considering a) that one multi-channel stereophonic sound system
10、 has been defined in Recommendation ITU-R BS.775; b) that Recommendation ITU-R BS.775 Multi-channel stereophonic sound system with and without accompanying picture, recommends the use of five reference recording signals for left (L), right (R), centre (C) channels for the front, and left surround (L
11、S) and right surround (RS) channels for the side/rear, with an additional low frequency effects (LFE) channel; c) that Recommendation ITU-R BR.779 Operating practices for digital television recording, contains specifications for the allocation of audio channels on 4-track digital television recordin
12、g; d) that many regions exchange television programmes which include multi-channel sound; e) that a single set of technical parameters such as assignment of multi-channel audio signals to tracks, level conditions, etc. is needed in order to avoid operational problems, recommends 1 that for the recor
13、ding and exchange of multi-channel sound programme material with or without accompanying picture, the track assignment, recording characteristics and level alignment should be in accordance with Annex 1; *Radiocommunication Study Group 6 made editorial amendments to this Recommendation in 2001 in ac
14、cordance with Resolution ITU-R 44. *This Recommendation should be brought to the attention of the International Electrotechnical Commission (IEC) Committee TC 100. * International programme exchange is defined as the transmission of television or sound programme material (or components thereof) amon
15、g professional parties in different countries. It should be based on internationally agreed and widely employed technical standards or operating practices, except by prior bilateral agreement among the parties involved. If there are no such bilateral agreements, parties exchanging television or soun
16、d programme material are urged to follow the audio channel/signal to track assignments described in this Recommendation. 2 Rec. ITU-R BR.1384-2 2 that the physical label on the recording media, shipping or storage container should indicate which mapping has been used on the recording media. Annex 1
17、1 Signal definitions The audio signals to be recorded for the multi-channel sound programme are designated according to Recommendation ITU-R BS.775: 3/2 format (preferred format for multi-channel sound, also usable for 2/2) L left channel/signal C centre channel/signal R right channel/signal LS left
18、 surround channel/signal (see Note 1) RS right surround channel/signal (see Note 1) LFE additional low frequency channel/signal (see Note 2) 3/1 format (see Note 3) L left channel/signal C centre channel/signal R right channel/signal MS monophonic surround channel/signal (see Note 4) The mixed audio
19、 signals to be recorded are designated as follows: 2/0 format (two channel stereophony) A complete mix left total channel/signal B complete mix right total channel/signal LTM alignment signal level 18 dB rel2. In regions which follow SMPTE guidelines, and where the recording format is a digital form
20、at with a linear resolution of 16 bits or more, the level alignment rules given in SMPTE recommended practice RP155 2004 “Audio levels for digital audio records on digital television tape recorders” are used. alignment signal level 20 dB rel digital clipping.6 Pink noise test signals Pink noise test
21、 signals, if present, shall be at equal levels on all channels. Excepting the LFE channel, if each channel of pink noise is reproduced at the same acoustic sound pressure level at the central listening position, then the relative balance of the programme audio channels should be correctly reproduced
22、 In the case of the LFE channel, the pink noise test signal is intended to be reproduced at an acoustic sound pressure level (within the LFE channel 120 Hz passband) of +10 dB relative to any of the other individual channels. Note that due to the limited bandwidth of the LFE channel, if the acousti
23、c level produced by the LFE pink noise is measured with a wideband sound pressure level meter, the reading will not measure +10 dB with respect to the other channels. The acoustic level of the LFE channel should measure +10 dB within its 120 Hz bandwidth when measured with a frequency selective mete
24、r. 2Relative to the digital clipping level, indicated with an IEC quasi-peak programme level meter. 3In the future, a correctly loudness-normalized signal may contain quasi-PPM levels in excess of those permitted by Recommendation ITU-R BS.645. 6 Rec. ITU-R BR.1384-2 Appendix 1 to Annex 1 A 12-track
25、 sound recording format for video recording of a 3/2 multi-channel sound programme should have the following assignment of sound tracks shown in Table 3, which follow the assignment in Table 2 for the first group of 8 tracks. TABLE 3 Channel assignments for a 12-channel recording(1)Track Mapping typ
26、e 1 (channel) Mapping type 2 (channel) 1 L L 2 R R 3 C C 4 LFE LFE 5 LS(2)LS(2)6 RS(2)RS(2)7 A A 8 B B 9 LTM&E F 10 RTM&E 11 F F 12 F (1)Mapping types 1 and 2 are extensions of the 8 audio channel/signal to track mapping described by SMPTE 2035 (Audio Channel Assignments for Digital Television Recor
27、ders (DTRs) Table 1, case 11d. (2)In the case of programmes using the 3/1 multi-channel sound format, the MS (3 dB) monophonic surround signal should be placed on both tracks 5 and 6. This allows a programme with a single surround channel to be treated as a programme with two surround channels. The
28、MS (3 dB) signal will be reproduced out of both the LS and RS loudspeakers, with a relative level of 3 dB with respect to the front channels. The combined power into the room will be the correct relative level of 0 dB. Appendix 2 to Annex 1 In some areas, slightly different track assignments are in
29、use. Care should be taken to always examine the tape label to determine the exact assignment which is used. The following examples are known. In the United States of America, the following channel assignment may sometimes be used when the recording does not carry a 2-channel stereo compatible signal
30、 Rec. ITU-R BR.1384-2 7 TABLE 4 Channel assignments for an 8-channel recording Track Channel 1 L 2 R 3 C 4 LFE 5 LS(1)6 RS(1)7 F 8 F (1)In the case of programmes using the 3/1 multi-channel sound format, the MS (3 dB) monophonic surround signal should be placed on both tracks 5 and 6. This allows a
31、 programme with a single surround channel to be treated as a programme with two surround channels. The MS (3 dB) signal will be reproduced out of both the LS and RS loudspeakers, with a relative level of 3 dB with respect to the front channels. The combined power into the room will be the correct re
32、lative level of 0 dB. The channel assignments listed in Table 5 are also in common use for programme interchange in formats containing 12 audio tracks, in addition to the assignments listed in Table 3. Care should be taken to always examine the tape label to determine the exact assignment which is u
33、sed. TABLE 5 Channel assignments for a 12-channel recording Track number Mapping type 12/1 Mapping type 12/2 Mapping type 12/3 1 A Programme 1 A 2 B Programme 1 B 3 LTM&E Programme 2 A 4 RTM&E Programme 2 B 5 L Programme 1 L Programme 1 NPCM 6 R Programme 1 R Programme 1 NPCM 7 C Programme 1 C Programme 2 NPCM 8 LFE Programme 1 LFE Programme 2 NPCM 9 LS Programme 1 LS Programme 1 MM 10 RS Programme 1 RS Programme 2 MM 11 F F/Programme 2 SAP F/Programme 2 SAP 12 F/SAP F/Programme 1 SAP F/Programme 1 SAP The monophonic channel may optionally be replaced with a user defined audio signal.
