ITU-R BR 778-1-1994 Analogue component television tape recording Standards for the international exchange of television programmes on magnetic tape《模拟分量电视磁带记录 磁带上电视节目的国际交换标准》.pdf

1、Rec. ITU-R BR.778-1 SECTION lO/llR-B: TELEVISION RECORDING 11 RECOMMENDATION ITU-R BR.778- 1 ANALOGUE COMPONENT TELEVISION TAPE RECORDING Standards for the international exchange of television programmes on magnetic tape (Question ITU-R 10211 1) (1992- 1994) The ITU Radiocommunication Assembly, reco

2、mmends that magnetic recordings of analogue component signals used for the international exchange of television programmes should meet the following standards. 1. Television standard Recording on magnetic tape of television programmes for international exchange should be carried out in - 625-lines:

3、50 field/s; - 525-lines: 60 field/s. accordance with one of the following classes of television systems: 2. Recording format 2.1 Analogue recording of component video signais The recordings should conform with one of the formats specified in the following: - helical-scan video tape cassette system u

4、sing 12.65 mm (0.5 in) magnetic tape on type L: IEC Publication 961 + Amendment 1; - helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type M2: IEC Publication 1 1 18. Note 1 - The characteristics of the television systems are given in Recommendation IT-R BT.470. Note

5、2 - References for the measurement and alignment for television tape recorders will be contained in a draft new Recommendation. Note 3 - Guidelines for the storage of magnetic tapes are contained in EBU Publication Tech 3202. Note 4 -Format L mode I is frequently referred to as betacam format. Forma

6、t L mode II is frequently referred to as betacam SP format. 3. Specifications for programme sound recording 3.1 Alignment level In Europe, when no other practice has been agreed between the exchanging organizations, the alignment flux level at 1 o00 Hz should correspond to the reference flux level s

7、upplied on the Sony alignment cassette CR8-1BPS. Details of the alignment procedures designed to achieve this are given in EBU Recommendation R73-1993. ITU-R RECMN*BR= 778-1 9Y Y855212 0521695 357 W Rec. ITU-R BR.778-1 12 3.2 Programme sound allocation The allocation of audio tracks should be as fol

8、lows: Operational mode _ Finished monophonic television programmes Finished stereophonic television programmes Original news recordings Channel I Track() Monophonic programme mix International sound (if any) I 2 Stereo left Stereo right 1 2 Commentary (if any) International sound (if any) ci) Track

9、1 is the inner track. The allocation of programme sound channels to the FM and (optionally) PCM audio tracks requires prior agreement. Note 1 - Many broadcasting organizations use companding for internal purposes. In Europe the use of Dolby-C audio companding is recommended on the longitudinal audio

10、 tracks of format L mode II (betacam SP) tapes for programme exchange (EBU Recommendation R39- 1993). 4. Editing Electronic editing shall maintain an off-tape synchronizing pulse train with a phase relationship to the playback reference of the machine sufficiently close to avoid disturbances. Inform

11、ation on the time and control code required for editing can be found in IEC Publication 461. The requirements for dominant field editing as defined in EBU Technical Recommendation R62- 1990 must be observed (see Annex I of Recommendation ITU-R BR.469). Note 1 - If the programme signals recorded have

12、 been derived from a composite source, special rules for composite editing should be observed to achieve optimum signal quality. The EBU has issued Technical Statements D23-1984 and D25-1986 describing in detail the EBU requirements for synchronizing pulse generators for 625-line/50 fields PAL signa

13、ls. Further information can be found in Recommendation ITU-R BR.469, Annex 2. 5. Composition and duration of leaders and trailers Leader and trailer sections of monophonic recordings should be located on the tape in conformity with the sequence shown in Table 1. For stereophonic recordings see Table

14、 2. ITU-R RECMN*BR. 778-1 94 m 4855212 0521846 293 m Picture Duration (SI Tape section Rec. ITU-R BR.778-1 Sound (on any channel Control carrying programme sound) track signal 13 Protection leader 6. Programme identification 6.1 The following minimum information should be supplied with each recorded

15、 television tape: - -. - name of the organization which made the recording: title of programme, or title, sub-title and episode number: total number of spools, and number of the spool in the sequence when the programme is contained on more than one spool; reference number (library number) of program

16、me or of tape; total playing-time, and playing-time of the programme material recorded on the tape; line and field system (625/50 or 525/60); aspect ratio of recorded image (see Note i) if different from 4:3; which audio tracks have been used; the content of each audio track; use of noise reduction

17、on audio tracks. - - - - - - - I 1 Blank tape 10 (minimum) Note I -Further details of the labelling and identification of 16:9 aspect ratio television recordings are given in EBU Recommendation R71-1992. Alignment leader 6.2 The information required in $6.1 shall be provided in at least one of the o

18、fficial languages of the ITU. Uninterrupted 1 O00 Hz at reference 60 Alignment signal() (minimum) TABLE 1 8 2 Cue-up leader Black or cue(3) Silence or cue Black(3) Silence Unintempted Leader Black(3) 30 (minimum) Run-out trailer Silence Optional (maximum) I Blank tape Programme identification Spoken

19、 identification (minimum) preferred, or silence Identification leader Playing time of programme Programme (I) (2) (3) (4) Examples of suitable alignment signals for 625-lines, 50 fields systems will be given in a draft new Recommendation. See 5 3.1 of Recommendation IT-R BR.469. In the case of colou

20、r recordings the black signal should be colour black. It is desirable that the colour field sequence (8 fields in PAL, 4 fields in NTSC) should continue unintenupted in relation to the beginning and end of the programme recording. Where the time and control code is recorded on the assigned longitudi

21、nal track (see 5 3), the time indication of the programme start should be shown on the label accompanying the tape. ITU-R RECMNUBR. 778-1 94 m Y855212 0521847 12T Rec. ITU-R BR.778-1 14 Sound Sound track 2 track 1 Picture Duration (SI Tape section TABLE 2 Control track signal Alignment leader Leader

22、 1 O00 Hz at 1 000 Hz at interrupted(3) (4) ieveP) (4) 60 Alignment reference reference Uninterrupted (minimum) signai() (minimum) lo I Protection leader Identification leader Cue-up leader Blank tape 15 Programme Spoken Spoken (minimum) identification identification identification preferred, or pre

23、ferred, or silence silence 8 Black or cue Silence or cue Silence or cue 2 Black Silence Silence Black Silence 30 (minimum) Run-out trailer Optional Silence 5 (maximum) Blank tape I I I I I I rogramrne(5) Playing time of programme Programme Uninterrupted I UnintenuDted Examples of suitable alignment

24、signals for 625-lines, 50 field/s systems will be given in a draft new Recommendation. See 8 3.1 of Recommendation ITU-R BR.469. The tones for both tracks must be coherent (i.e. from the same source) and in phase. The tone should be interrupted for 0.25 s every 3 s to enable identification of stereo

25、phonic recordings. The interruption may be made without using automatic equipment by organizations that only very occasionally need to interchange stereophonic video tape recordings. Under these circumstances, it is recognized that the specified interruption duration will not be strictly adhered to.

26、 In Australia the reference tone is on track 1 and the interrupted reference tone is on track 2. This is done to identify tracks and retain compatibility with mono track 1 reference tone. Where the time and control code is recorded on the assigned longitudinal track, the time indication of the programme start should be shown on the label accompanying the tape.