1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TE LEC0 MM UN I CATI0 N STANDARDIZATION SECTOR OF ITU J.151 (1 0/2000) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Digital television distribution through local subscriber networks RF remodulator interface for digital
2、 television ITU-T Recommendation J.151 (Formerly CCITT Recom mendation) ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifications for analogue sound-programme transmission Performance characteristics of anal
3、ogue sound-programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signals Circuits for analogue television transmission Analogue television transmission over metallic lines and in
4、terconnection with radio-relay links Digital transmission of television signals Ancillary digital services for television transmission Operational requirements and methods for television transmission Interactive systems for digital television distribution Transport of WEG-2 signals on packetised net
5、works J.l-J.9 5.10-5.19 5.20-J.29 5.30-5.39 5.40-J.49 J.50-J.59 5.60-J.69 J.70-J.79 J.80-J.89 J.90-J.99 J. 100-J. 109 J. 1 10-J. 129 J. 130-5.139 5.140-5.149 Il For further details, please refer to the list of ITU-T Recommendations. ITU-T Recommendation 5.151 RF remodulator interface for digital tel
6、evision Summary With the advent of digital television (DTV) there is now a need for a simple and cost-effective interconnect between the various digital signal sources and the DTV receiver. Digital video and audio are now available from digital VCRs (DVCR), terrestrial broadcasts, digital video disk
7、s (DVD), cable TV, satellite systems and digital camcorders. The RF remodulator in this Recommendation is an economical and practical digital interconnect for the new consumer digital video devices. The RF remodulator, is a one way throughput device with a data rate of 19.3 Mbils, which is suitable
8、for most connections. The interface transmits MPEG (Moving Picture Experts Group) data for compressed digital video and audio and an OSD (on-screen display) overlay. The RF remodulator uses a simple coaxial cable to interconnect devices in a way with which consumers are most familiar. Source ITU-T R
9、ecommendation J. 15 1 was prepared by ITU-T Study Group 9 (1 997-2000) and approved by the World Telecommunication Standardization Assembly (Montreal, 27 September - 6 October 2000). ITU-T 5.151 (10/2000) i FOREWORD The International Telecommunication Union (U) is the United Nations specialized agen
10、cy in the field of telecommunications. The U Telecommunication Standardization Sector (ITU-T) is a permanent organ of U. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basi
11、s. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the U-T study groups which, in turn, produce Recommendations on these topics. The approval of U-T Recommendations is covered by the procedure laid down in WTSA Resolution
12、 1. In some areas of information technology which fall within U-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a r
13、ecognized operating agency. INTELLECTUAL PROPERTY RIGHTS U draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed I
14、ntellectual Property Rights, whether asserted by U members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendatio
15、n. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. o mu 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanica
16、l, including photocopying and microfilm, without permission in writing from ITU. ITU-T 5.151 (10/2OOO) 11 CONTENTS 1 2 3 4 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 6 6.1 7 7.1 7.2 8 9 9.1 Scope Normative references Abbreviations . System overview DTV remodulator RF output specifications . Selectable output
17、 channel frequency Nominal RMS output level . Pilot phase noise . 5.3.1 5.3.2 Error vector magnitude (EVM) 5.4.1 EVM-8VSBtrellis . Pilot phase noise - 8 VSB trellis . Pilot phase noise - 16 VSB . 5.4.2 EVM - 16 VSB . 5.4.3 EVM definition . Connector . Side-band output . Roll-off specification Data a
18、nd clock rates On-screen display (OSD) support OSD encapsulation . 6.1.1 PES encapsulation . 6.1.2 Syntax and semantics for PES packets carrying OSD information 6.1.3 Maximum transmission rate for OSD data 6.1.4 OSD retransmission . OSD data Format of OSD data 7.1.1 Subframe types 7.1.2 Subframe typ
19、eCode . 7.1.3 Subframe processing . 7.1.4 Subframe syntax and definition . Alignment of OSD with video Capability profiles DTV RF remodulator input specifications . Input overview ITU-T 5.151 (10/2OOO) 1 1 1 3 5 5 5 5 5 5 5 5 5 5 6 6 6 7 7 7 8 8 9 10 10 10 10 11 11 11 19 20 20 20 . 111 9.2 9.3 Input
20、 fi-om remodulator to source . Input fi-om source to remodulator . 10 Monitor mode . 10.1 Monitor mode overview . 10.2 Monitor mode conditions . 10.3 Monitor mode practices 11 Measurement Page 21 21 22 22 22 23 24 iv ITU-T 5.151 (10/200O) ITU-T Recommendation 5.151 RF remodulator interface for digit
21、al television 1 Scope This ITU-T Recommendation defines an RF remodulator interface for digital television with an advanced on-screen display (OSD) overlay capability. This Recommendation defines minimum specifications for a one-way data path utilizing an 8 VSB trellis (8T VSB) or a 16 VSB remodulat
22、or in compliance with Annex D/J.83 (System D) (ATSC Standard N53, Annex D). The advanced overlay uses the same OSD syntax as ITU-T J.117 and allows signal service providers their incremental revenue from programme guides and supplemental services. The RF remodulator also facilitates conditional acce
23、ss required by service providers. This Recommendation applies to any type of device used to connect to a J.83 System D compliant digital television receiver. Devices meeting this Recommendation should interoperate with any J. 83 System D compliant receiver that also supports “monitor mode.“ This Rec
24、ommendation addresses RF output specifications, on-screen display (OSD) capabilities, and capability profiles for a DTV remodulator and recommendations concerning input to the remodulator. This Recommendation is derived from several standards of the Electronic Industries Alliance (EM). 2 Normative r
25、eferences The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision;
26、users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is published regularly. - ITU-R BT.601-5 (1995), Studio encoding para
27、meters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios. ITU-R BT.709-4 (2000), Parameter values for the HDTV standards for production and internationalprogramme exchange. ITU-T J.83 (1997), Digital multi-programme systems for television, sound and data services for cable di
28、stribution, Annex D. IEC 601 69-24 (1991), Radio-frequency connectors - Part 24: Radio-frequency coaxial connectors with screw coupling, typically for use in 75 ohm cable distribution systems - - - (Type F). 3 Abbreviations This Recommendation uses the following abbreviations: ATSC Advanced Televisi
29、on Systems Committee AN AudioNideo CEA Consumer Electronics Association 1 ITU-T 5.151 (10/2OOO) CLUT Colour Look-Up Table CPU Central Processing Unit CVCT Cable Virtual Channel Table D/A Digital-to-Analogue DTV DVCR Digital Video Cassette Recorder DVD Digital Video Disk EIA Electronic Industries All
30、iance E Event Information Table EVM Error Vector Magnitude HDTV High Definition Television IEC International Electrotechnical Commission IEEE IF Intermediate Frequency IRC Interface Reference Clock ITU International Telecommunication Union MPEG Moving Picture Experts Group NTSC National Television S
31、ystems Committee OSD On-Screen Display PAT Program Association Table PES Program Elementary Stream PID Program Identifier PMT Program Map Table PSIP RF Radio Frequency SDTV Standard Definition Television STB Set-Top Box TSID Transport Stream Identification TVCT Terrestrial Virtual Channel Table UHF
32、Ultra High Frequency VCR Video Cassette Recorder VCT Virtual Channel Table VHF Very Hi as the complexity of requiring support for both was deemed excessive for the improvement in quality that would result. C, and cb are chrominance vectors related to primary colour signals (R, G, B) in accordance wi
33、th ITU-R BT.709-2 or ITU-R BT.601-4. For pixel-format O only, any pixel with a Y value of zero should be transparent. Pixels with non- zero values of Y should be opaque. Y a MSB LSB c, Cr pixel-format O pixel-format 1 pixel-format 2 1 2 MSB LSB Mix with video using mix parameter in the Set-OSD-pixel
34、-format subfiame Transparent MSB LSB T0909530-00 Figure 10/5.151 - Pixel format bit fields a is an alpha level associated with pixels in pixel-format 1 or 2. a values for pixel-format 1 are defined in Table 7. For pixel-format 2, values in between O and all-ones indicate the mix weight between the O
35、SD pixel and decoded video for each pixel. A zero value for a indicates transparent. The all-ones value indicates opaque. The interpolation between zero and all ones should be approximately linear. The mix parameter in the Set-OSD-pixel-format subfi-ame is used with pixel-format 1 to specifj the alp
36、ha-blend value to use for pixels that are neither transparent nor opaque. Table 7 should define the interpretation of the 2-bit alpha field in pixels formatted as pixel-format 1. The mix parameter should be ignored in an OSD Consumer for pixel formats O and 2. Table 7/5.151 - A field interpretation
37、for pixel-format 1 I pixel a I Meaning I I O I Opaque I I 3 I Reserved for future use I cs defines the chrominance standard used in the OSD Producer, and acts to notifj the OSD Consumer that it should interpret Y-Cb-Cr data in accordance with the referenced standard, if possible. cs is defined in Ta
38、ble 8. 14 ITU-T 5.151 (10/2OOO) Table W5.151 - Colourimetry standards O O I cs I Colour Standard I O 1 Should put data into the active buffer immediately Should start to put data into the active buffer synchronized with the start of the next vertical retrace I O I ITU-R BT.709-2 I 1 I 1 I ITU-R BT.6
39、01-4 I 1 Should put data into an off-screen buffer and then swap with the active buffer, synchronized with the start of the next vertical retrace buf indicates whether data is placed into the buffer currently being used for output (buf = O) or into an a buffer that is not currently being used for ou
40、tput (buf = 1). The buf and sw bits together specify how the data update will take place as shown in Table 9. When double buffering is not supported in the OSD consumer, buf = 1 has no meaning. In this case the OSD consumer may ignore subframes with buf = 1. Table 9/5.151 - buf/sw coding I buf I sw
41、I Rule I I 1 I O I Should put data into an off-screen buffer I Table 10/5.151 - fill-value coding I I OSD-layout I fill-value format 4 bits (right justified) 8 bits (right justified) as defined by pixel-format Coding 3-255 Reserved For Set-OSDqixel-format purposes, Set OSD pixel format subframe, Ite
42、m 1 below states “Processing the first Set-OSD-pixel-format subframe after establishing the OSD connection should have the effect of setting the OSD frame buffers to the fill pixel value provided in the command.“ For purposes of compliance with this Recommendation, the condition I .after establishin
43、g the OSD connection .I, should mean I .after an OSD producer has been selected .l. Processing within the OSD Consumer of the Set-OSD-pixel-format subframe should conditionally cause the OSD frame buffers to be initialized to the fill-value value provided: 1) Processing the first Set-OSD-pixel-forma
44、t subframe after establishing the OSD connection should have the effect of setting the OSD frame buffers to the fill pixel value provided in the command. 2) Processing a subsequent Set-OSD-pixel-format subframe that changes the pixel-format or OSD-layout, the DTV should initialize the OSD buffers to
45、 the fill pixel value provided. Processing a subsequent Set-OSD-pixel-format subframe that changes only the mix field or CLUT data, previously defined pixel data values do not change. 15 ITU-T 5.151 (10/2OOO) CLUTN is a colour look-up table entry. CLUT entries are 16-bits, formatted according to the
46、 pixel format defined in pixel-format. typeCode I III 7.1.4.2 4-bit OSD data subframe Figure 11 defines the format of the 4-bit-OSD-data subframe, used to deliver 4-bit pixels from AN datalength III, III IIIIIIIIIII Source to display. MSB (fist) O buf sw x-loc I III III, width III III III III pixelO
47、 pixel 13 pixel2 pixel3 III III III III LSB “16 Y-loc III III, height III III III III . . . . III III III III . . . pixelN T0909540-00 - r- I I zeroPad2 ,I I, zeropad 1 AI Figure 1UJ.151 - 4-bit OSD data subframe format typeCode should be set to value 0216, indicating the 4-bit-OSD-data subframe for
48、mat. The 24-bit datalength field should be set to indicate the number of data bytes in the remainder of the subframe. The subframe should be padded so that the next subframe address is quadlet aligned. Based on the height and width parameters (if both are odd numbers), the least significant 4 bits i
49、n the last data byte may be unused. X-loc is the 12-bit X-coordinate (column number) within the image buffer in the buffer indicated by buf. The coordinate system is defined with 0,O in the upper left corner. Y-loc is the 12-bit Y-coordinate (row number) within the image buffer in the buffer indicated by buf. 16 ITU-T 5.151 (10/2OOO) x-loc width Po+ P,-b P2+ P3+ P4+ P5 y-10c t G P6+ P7-b P,+ P9+ P1o-b P, height 13- 14- 15 -16 -17 Figure 12/5.151 - Pixel data display order buf and sw are the same as de
