1、 Recommendation ITU-R BT.1120-8(01/2012)Digital interfaces for HDTV studio signalsBT SeriesBroadcasting service(television)ii Rec. ITU-R BT.1120-8 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by
2、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 functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Confere
3、nces 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 referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and
4、 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 ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available
5、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 service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite servi
6、ces 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 and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and fre
7、quency 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, 2012 ITU 2012 All rights reserved. No part of this publication may be reproduced, by any means whats
8、oever, without written permission of ITU. Rec. ITU-R BT.1120-8 1 RECOMMENDATION ITU-R BT.1120-8 Digital interfaces for HDTV studio signals (Question ITU-R 130/6) (1994-1998-2000-2003-2004-2005-2007-2012) Scope This HDTV interface operates at two nominal clock frequencies, 1.485 GHz and 2.97 GHz, and
9、 conveys the uncompressed payload defined in Part 2 of Recommendation ITU-R BT.709. The interface may also be used for carrying packetized data. The ITU Radiocommunication Assembly, considering a) that Recommendation ITU-R BT.709 provides the image format parameters and values for HDTV production an
10、d international programme exchange and contains the following HDTV studio standard to cover a wide range of applications: 1 125 total lines and 1 080 active lines; picture rates of 601, 50, 301, 25 and 241Hz, including progressive, interlaced and segmented frame transport; b) that a wide range of eq
11、uipment based on the above systems has been developed and is commercially available; c) that many programmes are being produced in the above systems using the above equipments and that in the development of broadcasting and other services there is an increasing need for HDTV production installations
12、; d) that serial digital interconnection has been developed to provide reliable transparent digital interconnections, recommends 1 that the specifications described in this Recommendation should be used as bit-serial digital interfaces for HDTV studio signals; 2 that Note 1 is considered as part of
13、the Recommendation. NOTE 1 Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (e.g. to ensure interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The
14、words “shall” or some other obligatory language such as “must” and the negative equivalents are used to express requirements. 1Frame rates of 60/1.001, 30/1.001 and 24/1.001 Hz are also included. 2 Rec. ITU-R BT.1120-8 Annex 1 Interfaces for HDTV signals conforming to Recommendation ITU-R BT.709, Pa
15、rt 22This Annex specifies digital interfaces for the systems listed in Table 1. Digital coding parameters are listed in Table 2. For the 60, 30 and 24 Hz systems, picture rates having those values divided by 1.001 are also included. Parameter values for these systems are presented in parentheses. TA
16、BLE 1 HDTV systems based on CIF System Capture (Hz) Transport 60/P 60 progressive Progressive 30/P 30 progressive Progressive 30/PsF 30 progressive Segmented frame 60/I 30 interlaced Interlaced50/P 50 progressive Progressive 25/P 25 progressive Progressive 25/PsF 25 progressive Segmented frame 50/I
17、25 interlaced Interlaced24/P 24 progressive Progressive 24/PsF 24 progressive Segmented frame 1 Digital representation 1.1 Coding characteristics The HDTV signals to be transported shall comply with the characteristics described in Recommendation ITU-R BT.709, Part 2. 2 Digital interface The interfa
18、ce provides a unidirectional interconnection. The data signals are in the form of binary information and are coded accordingly: video data (10-bit words); timing reference and identification codes (10-bit words); ancillary data (see Recommendation ITU-R BT.1364). When 8-bit video data are used, two
19、LSBs of zeros are to be appended to the 8-bit words to form 10-bit words. 2Legacy signals complying with Recommendation ITU-R BT.709, Part 1: See Appendix 3 to Annex 1. Rec. ITU-R BT.1120-8 3 2.1 Serial video data Y, CBand CRsignals are handled as 20-bit words by time-multiplexing CBand CRcomponents
20、. Each 20-bit word corresponds to a colour-difference sample and a luminance sample. The multiplex is organized as: (CB0Y0)(CR0Y1) (CB1Y2)(CR1Y3) . where Yiindicates the i-th active luminance sample of a line, while CBjand CRjindicate the j-th active colour-difference samples of CBand CRcomponents.
21、CBjand CRjsamples are co-sited with the even numbered Yisample due to the half-rate sampling of the colour-difference signals. The data words corresponding to digital levels 0(10)through 3(10)and 1 020(10)through 1 023(10)are reserved for data identification purposes and must not appear as video dat
22、a. R, G, B signals are handled as 30-bit words in addition to the above 20-bit words for Y, CB, CRsignals.4 Rec. ITU-R BT.1120-8 TABLE 2 Digital coding parameters Item Parameter System 60/P 30/P 30/PsF 60/I 50/P 25/P 25/PsF 50/I 24/P 24/PsF 1 Coded signals Y, CB, CRor R, G, B These signals are obtai
23、ned from gamma pre-corrected signals, namely EY, ECB, ECRor ER, EG, EB. Also see Recommendation ITU-R BT.709, Part 2 2 Sampling lattice R, G, B, Y Orthogonal, line and picture repetitive 3 Sampling lattice CB, CROrthogonal, line and picture repetitive, co-sited with each other and with alternate(1)Y
24、 samples 4 Number of active lines 1 080 5 Sampling frequency(2)(MHz) R, G, B, Y 148.5 (148.5/1.001) 74.25 (74.25/1.001) 148.5 74.25 74.25 (74.25/1.001) CB, CR(3)74.25(74.25/1.001) 37.125 (37.125/1.001) 74.25 37.125 37.125 (37.125/1.001) 6 Number of samples/line R, G, B, Y CB, CR2 200 1 100 2 640 1 3
25、20 2 750 1 375 7 Number of active samples/line R, G, B, Y CB, CR1 920 960 8 Position of the first active Y, CB, CRsampling instants with respect to the analogue sync timing reference OH(4)(see Fig. 1) 192 T Rec. ITU-R BT.1120-8 5 TABLE 2 (end) Item Parameter System 60/P 30/P 30/PsF 60/I 50/P 25/P 25
26、/PsF 50/I 24/P 24/PsF 9 Coding format Uniformly quantized PCM for each of the video component signals 8- or 10-bit/sample 10 Quantization level assignment (5) Video data Timing reference 1(8)through 254(8)or 4(10)through 1 019(10)0(8)and 255(8)or 0(10) thru 3(10)and 1 020 (10)thru1 023(10)11 Quantiz
27、ation levels(6) Black level R, G, B, Y Achromatic level CB, CR Nominal peak R, G, B, Y CB, CR16(8)or 64(10)128(8)or 512(10)235(8)or 940(10)16(8)and 240(8)or 64(10)and 960(10)12 Filter characteristics See Recommendation ITU-R BT.709 (1)The first active colour-difference samples are co-sited with the
28、first active Y sample. (2)The sampling clock must be locked to the line frequency. The tolerance on frequency is 0.001%. (3)CB, CR sampling frequency is half of luminance sampling frequency. (4)T denotes the duration of the luminance sampling clock or the reciprocal of the luminance sampling frequen
29、cy. (5)When 8-bit words are treated in 10-bit system, two LSBs of zeros are to be appended to the 8-bit words. (6)These levels refer to precise nominal video levels. Signal processing may occasionally cause the signal level to deviate outside these ranges. 6 Rec. ITU-R BT.1120-8 2.2 Video timing rel
30、ationship with analogue waveform The digital line occupies m clock periods. It begins at f clock periods prior to the reference transition (OH) of the analogue synchronizing signal in the corresponding line. The digital active line begins at g clock periods after the reference transition (OH). The v
31、alues for m, f and g are listed in Table 3. See Fig. 1 and Table 3 for detailed timing relationships in the line interval. FIGURE 1 Data format and timing relationship to analogue waveform BT.1120-01()k()d ()d()e50%OHAnalogue active line ( )bAnalogue full line ( )cVideo data block ( )h()f ()gEAVSAVE
32、AVVideo data ( )Y, R , G, BEAVSAVEAVMultiplexed video data ( / )CCBR()iDigital active line ( )lDigital line ( )mAnalogue lineblanking ( )aDigital line blanking () j For interlaced and segmented frame systems, the start of digital field/segment is fixed by the position specified for the start of the
33、digital line. See Fig. 2a) and Table 4a) for detailed relationships in the field/segment interval. For progressive systems, the start of the digital frame is fixed by the position specified for the start of the digital line. See Fig. 2b) and Table 4b) for detailed relationships in the frame interval
34、. 2.3 Video timing reference codes SAV and EAV There are two timing reference codes, one at the beginning of each video data block SAV and the other at the end of each video data block EAV. These codes are contiguous with the video data, and continue during the field/frame/segment blanking interval,
35、 as shown in Fig. 2. Rec. ITU-R BT.1120-8 7 TABLE 3 Line interval timing specifications Symbol Parameter Value 60/P 30/P 30/PsF 60/I 50/P 25/P 25/PsF 50/I 24/P 24/PsF Number of active Y samples per line 1920 Luminance sampling frequency (MHz) 148.5(148.5/1.001) 74.25 (74.25/1.001) 148.5 74.25 74.25
36、(74.25/1.001) a Analogue line blanking (T) +12 280 0 +12 280 0 +12 280 0 b Analogue active line (T) +0 1 920 12 c Analogue full line (T) 2 200 2 640 2 750 d Duration between end of analogue active video and start of EAV (T) 0-6 e Duration between end of SAV and start of analogue active video (T) 0-6
37、 f Duration between start of EAV and analogue timing reference OH(T) 88 528 638 g Duration between analogue timing reference OHand end of SAV (T) 192 h Video data block (T) 1 928i Duration of EAV (T) 4 j Duration of SAV (Tk Digital line blanking (T) 280 720 830 l Digital active line (T) 1 920m Digit
38、al line (T) 2 200 2 640 2 750 NOTE 1 The parameter values for analogue specifications expressed by the symbols a, b and c indicate the nominal values. NOTE 2 T denotes the duration of the luminance clock or the reciprocal of the luminance sampling frequency. 8 ITU-R BT.1120-8 FIGURE 2 Video timing r
39、eference codes SAV and EAV BT.1120-02Digital line blankingEAV SAV1 frameField/segmentNo.1Field/segmentNo.2Field/segment No. 1active videoField/segment No. 2active videoValue of (F/V/H) Value of (F/V/H)1 digital lineDigital line blankingEAV SAV1 frameActive videoValue of (F/V/H) Value of (F/V/H)1 dig
40、ital linea) Field/segment timing relationship for interlace and segmented frame systemsb) Frame timing relationship for progressive systemsNote 1 The values of (F/V/H) for EAV and SAV represent the status of bits for F, V, and H; in a way tha t thethree-bit word composed of F, V, H represents a bina
41、ry number expressed in decimal notation (F corr espondingto MSB and H to LSB). For example, the value 3 represents the bits of F = 0, V = 1 and H = 1.022022664466L1L2L3L4L5L6L7L8L9L10L11L12775577331133022022L1L2L3L4L5L6331133ITU-R BT.1120-8 9 Each code consists of a four-word sequence. The bit assig
42、nment of the word is given in Table 5. The first three words are fixed preamble and the fourth word carries the information that defines field identification (F), field/frame blanking period (V), and line blanking period (H). In an 8-bit implementation bits Nos. 9 to 2 inclusive are used. The bits F
43、 and V change state synchronously with EAV at the beginning of the digital line. The value of protection bits, P0to P3, depends on the F, V and H as shown in Table 6. The arrangement permits one-bit errors to be corrected and two-bit errors to be detected at the receiver, but only in the 8 MSBs, as
44、shown in Table 7. TABLE 4 a) Field/segment interval timing specifications for interlaced and segmented frame systems Symbol Definition Interface digital line number Number of active lines 1 080 L1 First line of field/segment No. 1 1 L2 Last line of digital field/segment blanking No. 1 20 L3 First li
45、ne of field/segment No. 1 active video 21 L4 Last line of field/segment No. 1 active video 560 L5 First line of digital field/segment blanking No. 2 561 L6 Last line of field/segment No. 1 563 L7 First line of field/segment No. 2 564 L8 Last line of digital field/segment blanking No. 2 583 L9 First
46、line of field/segment No. 2 active video 584 L10 Last line of field/segment No. 2 active video 1 123 L11 First line of digital field/segment blanking No. 1 1 124 L12 Last line of field/segment No. 2 1 125 NOTE 1 Digital field/segment blanking No. 1 denotes the field/segment blanking period that is p
47、rior to the active video of field/segment No. 1, and digital field/segment blanking No. 2 denotes that prior to the active video of field/segment No. 2. b) Frame interval timing specifications for progressive systems Symbol Definition Interface digital line number Number of active lines 1 080 L1 Fir
48、st line of frame 1 L2 Last line of digital frame blanking 41 L3 First line of active video 42 L4 Last line of active video 1 121 L5 First line of digital frame blanking 1 122 L6 Last line of frame 1 125 10 ITU-R BT.1120-8 TABLE 5 Bit assignment for video timing reference codes Word Bit number 9 (MSB
49、) 8 7 6 5 4 3 2 1 0 (LSB) First 1 1 1 1 1 1 1 1 1 1 Second 0 0 0 0 0 0 0 0 0 0 Third 0 0 0 0 0 0 0 0 0 0 Fourth 1 F V H P3P2P1P00 0 Interlaced and segmented frame system F = 1 during field/segment No. 2 = 0 during field/segmentNo. 1 V = 1 during field/segment blanking = 0 elsewhere H = 1 in EAV = 0 in SAV Progressive system F = 0 V = 1 during frame blanking = 0 elsewhere H = 1 in EAV = 0 in SAV NOTE 1 P0, P1, P2, P3in the fourth word are the protection bits (see Table 6). TABLE 6 Protection bits for SAV and EAV SAV/EAV bit status
