1、Rec. ITU-R BR.1515 1 RECOMMENDATION ITU-R BR. 15 15 International exchange of digital electronic news gathering recordings (Questions ITU-R 108/11 and ITU-R 239/11) (200 1) The ITU Radiocommunication Assembly, considering a) of the world; that digital electronic news gathering (ENG) is widely used i
2、n broadcasting in several parts b) that videotape recording is a fundamental element in ENG operation; c) based on the signal formats in Recommendation ITU-R BR.7 15; that many countries retain large analogue archives of valuable, irreplaceable programmes, d) that there are several types of equipmen
3、t available for digital ENG recording today, that differ in the recording medium, in the recording format, or in the compression schemes used for signal processing; e) that it would be beneficial to broadcasters in their digital ENG recording operation if analogue ENG recordings and digital ENG reco
4、rdings coexist in an edit environment and possibly if the compatibility of equipment in edit operations is provided; f) gaining its momentum. There are several services in operation; that the digital broadcasting service for high-definition television (HDTV) programmes is g) HDTV broadcasting age; t
5、hat digital ENG recording in HDTV quality is expected to be widely used in the coming h) that bit-rate compression techniques based on discrete cosinus transform (DCT) and variable-length code (VLC) coding can provide highly efficient methods of recording HDTV programmes, whose source data rate exce
6、eds 1 Gbis; j) that the operational and handling characteristics of digital HDTV video tape recorders (VTRs) have improved to the point that VTRs can be used not only in studios but also in the field, with a level of convenience similar to that of conventional VTRs; k) that HDTV cameras using two-mi
7、llion pixel charge coupled device (CCD) imaging devices and digital signal processing with advanced very large scale integration (VLSI) chip(s) can provide high quality HDTV pictures while offering the operating features and small size of conventional standard definition TV (SDTV) cameras, I 47 2 re
8、commends Rec. ITU-R BR.1515 1 that since digital ENG recordings are based on either SDTV or HDTV, an aggregated SDTV and HDTV playback equipment, which can function with both types of recording and/or can facilitate up and/or down converted outputs, should preferably be used. It should also be prefe
9、rable for the equipment to accept analogue and digital recordings; 2 that, in order to facilitate the use by receiving organizations of programmes originated from digital ENG recordings and relayed over transmission facilities, every effort should be made to minimize the loss of quality in each stag
10、e of the broadcast chain; 3 that analogue ENG tape recordings should preferably be transferred to a digital recording format for post-processing and archives; 4 that the 1 080 x 1 920 common image format specified in Recommendation ITU-R BT.709, Pari2 shall be preferred for image capture in digital
11、HDTV ENG recordings, while the legacy image formats specified in Recommendation IT-R BT.709, Pari 1 will retain their value as an archive format of HDTV material. NOTE 1 -Analogue ENG tape recordings can be processed to a higher number of generations without - significant deterioration in picture qu
12、ality, if they are first copied on full-broadcast quality digital VTR machines. NOTE 2 - The Tables in Annex 1 indicate specifications of the available recording devices for digital ENG programmes for SDTV and HDTV scanning systems. ANNEX 1 (Informative) Tables 1-6 specify major features and specifi
13、cations of the commercially available tape based storage devices for SDTV and HDTV acquisition camcorders: Table 1 - Tape recorder for SDTV 525/59.94 and HDTV 1125/60, (59.94) - Overview Table 2 - HDTV digital VTR for 1 125/60, (59.94) - Details Table 3 - SDTV digital VTR for 525/59.94 - Details Tab
14、le 4 - Digital VTRs for SDTV 625/50 and HDTV 1125/50 - Overview Table 5 - HDTV digital VTR for 1 125/50 -Details Table 6 - SDTV digital DVR for 625/50 - Details 48 Rec. ITU-R BR.1515 3 O VI N 0 8 c3 I% X m m m X F- “ 2 -1 I o 5 o Y) u - a n 49 4 Rec. ITU-R BR.1515 Format TABLE 2 HDTV digital VTR for
15、 1125160 (59.94) -Details A B C Commercial name() Sampling frequency I Video (MHZ) HDCAM DVCPRO D-9 HD HD 74.25 I Audio (kHz) I 48 Video (bits) Audio (bits) Quantization 8 20 16 2046 Number of audio channels Compression (video) 4 8 4 (20 bits) 8 (1 6 bits) Intra field/ Intra frame intra frame frame
16、DCT (16.6) DCT (1/10) DCT 1/7(2) Channel coding 24-25 I-NRZI Number of recording RF channels Total rate (Mbit/s) 4 (camcorder)/2 (studio) 4 198 Drum diameter (mm) Drum rotation (rps) Video rate (Mbits) I 140 I 1 O0 81.4 21.7 62 45 (camcorder) 149.85 (camcorder) 75 90 (studio) /299.70 (studio) Number
17、 of tracks Tape speed (mm/s) ECC 6/field . 40/fiame 20/frame 96.8 135.28 1 15.474 I inner I 231,219 I 85,77 Width of tape (mm) Media substance I Outer I 250,226 1 12.65 6.35 12.65 Metal particle p 149,138 Hc (Wm) Cassette size (mm) 132 184 L: 125 x 78 L: 188 x 104 S: 156 x 96 L: 254 x 145 Recording
18、time (min) Track pitch (pm) I 21.7 40/ I24 46 62 18 I 20 Min. wavelength (pm) I 0.49 I 0.587 EEC: Error correction code (2) 5/8 horizontal prefiltering and U4.4 DCT. Each format as commercially known is listed here. 50 5 Rec. ITU-R BR.1515 o) o - 8 o 2 9 o 2 b z M rc 0- -0 E, u 23 51 Rec. ITU-R BR.1
19、515 6 m O W Q) P vi - 2% + W r- in h u - W O W m E z m N P o m .g g 35 52 Rec. ITU-R BR1515 Format Conventional name() 7 A B HDCAM DVCPRO HD TABLE 5 HDTV digital VTR for 1125150 -Details Audio (kHz) 48 Sampling I Video(MHz) Audio (bits) Number of audio channels 74.25 20 16 4 8 frequency Outer 250,22
20、6 149,138 Quantization I Video (bits) 37.5175 8 150 (camcorder) 1300 (studio) Number of tracks Tape speed (ds) Compression (video) 61field 48lframe 80.7 135.41 5 intra fieldframe intra frame 1 DCT 1/7(*) I DCT (116.6) Width of tape (mm) Media substance Channel coding 12.65 6.35 Metal particle S-NRZI
21、 I 24-25 I-NRZI Hc (Wm) Total rate (Mbit/s) 132 184 154 I 167 Recording time (min) Video rate (Mbitls) 481149 46 117 I 1 O0 Number of recording RF channels 4 (camcorder)/Z (studio) ECC I inner 231,219 I 85,77 Drum diameter (mm) I 81.4 I 21.7 Drum rotation (rps) Track pitch (pm) 18 I 21.7 Minimum wavelength (pm) 0.49 Cassette size (mm) M: 156 x 96 L: 254 x 145 L: 125 x 78 (I) Each format as commercially known is listed here. (2) 518 horizontal prefiltering and 114.4 DCT. 53 8 Rec. TU-R BR.1515 I I Co M W c, I I E !2 h v e C O m .- i- 5: E 2 n - M .- - n m VI 54
