CEA-708-C-2006.pdf
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1、 CEA Standard Digital Television (DTV) Closed Captioning CEA-708-C July 2006 NOTICE CEA Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and impr
2、ovement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or nonmember of CEA from manufacturing or se
3、lling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard is to be used either domestically or in
4、ternationally. Standards, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adop
5、ting the Standard, Bulletin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC docu
6、ment can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulato
7、ry limitations before its use. (Formulated under the cognizance of the CEAs R4.3 Television Data Systems Subcommittee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2006 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email ATSC Standards: Advanced Television Systems Committee (A
8、TSC), 1750 K Street N.W., Suite 1200, Washington, DC 20006; Phone 202-872-9160; Fax 202-872-9161; Internet http:/www.atsc.org A ISO/IEC Standards: Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet htt
9、p:/; Email IEC Central Office, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland; Phone +41 22 919 02 11; Fax +41 22 919 03 00; Internet http:/www.iec.ch; Email pubinforiec.ch ISO Central Secretariat, 1, rue de Varembe, Case postale 56, CH-1211 Geneve 20, Switzerland; Phone +41 22 749 0
10、1 11; Fax +41 22 749 01 55; Internet http:/www.iso.ch; Email mbinfoiso.ch SMPTE Standards: Society of Motion Picture Web: http:/www.smpte.org 2.2 Informative References 2.2.1 Informative Reference List AES3-2003, AES Recommended practice for digital audio engineering - Serial transmission format for
11、 two-channel linearly represented digital audio data ATSC A/54A, Guide to the Use of the ATSC Digital Television Standard (December 4, 2003) ATSC A/76, Programming Metadata Communication Protocol (November 10, 2004) ISO 639-2:1998, Codes for the representation of names of languagesPart 2: Alpha-3 co
12、de SMPTE EG 43-2004, System Implementation of CEA-708-B and CEA-608-B Closed Captioning SMPTE 259M-1997, Television 10-Bit 4:2:2 Component and 4fsc Composite Digital Signals Serial Digital Interface SMPTE 292M-1998, Television Bit-Serial Digital Interface for High-Definition Television Systems TIA-2
13、32-F, Interface between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange (October 11, 2002) 2.2.2 Informative Reference Acquisition AES Documents: Audio Engineering Society, International Headquarters, 60 East 42nd Street, Room 2520, New York, N
14、ew York, 10165-2520, USA, Tel: +1 212 661 8528, Fax: +1 212 682 0477, Internet: http:/www.aes.org -,-,- CEA-708-C 5 ATSC Standards: Advanced Television Systems Committee (ATSC), 1750 K Street N.W., Suite 1200, Washington, DC 20006; Phone Phone 202-828-3130; Fax 202-828-3131; Internet http:/www.atsc.
15、org SMPTE Standards: Society of Motion Picture Web: http:/www.smpte.org TIA Standards: Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email: ISO Standards: Global Engineering Documents, Wo
16、rld Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email ISO Central Secretariat Office, 1, rue de Varembe, Case postale 56, CH-1211 Geneve 20, Switzerland; Phone +41 22 749 01 11; Fax +41 22 733 34 30; Internet http:/www.is
17、o.ch; Email centraliso.ch 3 Caption Channel Layered Protocol A formal data communications channel protocol has been established for the DTVCC caption data channel. This formalization provides a framework for describing the caption communications hierarchy. Grouping the structures, concepts, and feat
18、ures of this environment into the following hierarchical layers aids in the understanding of the organizational aspects of the DTVCC system. There are 5 layers in the DTVCC data framework: DTVCC Transport Layer, DTVCC Packet Layer, DTVCC Service Layer, DTVCC Coding Layer, and DTVCC Interpretation La
19、yer (see Figure 1). Similar to the OSI Reference Model, each of these layers provides particular services in the receiver, as shown in Table 1. -,-,- CEA-708-C 6 Services in a Receiver CEA-708-C Section DTVCC Protocol Model CEA-608-C Datastream Specification of Window appearance and content Placemen
20、t of Windows over Video Synchronization of Command Interpretation to the Display of video Reset of Caption Service 8 DTVCC Interpretation Layer Parsing of Syntax 7 DTVCC Coding Layer Demultiplexing of Caption Services 6 DTVCC Service Layer Detection of Synchronization Loss Resynchronization of Data
21、Stream Reset of Caption Decoder 5 DTVCC Packet Layer These layers are defined in CEA-608-C. Extraction of closed caption data from parent transport system, e.g. MPEG user data Demultiplexing of CEA-608-C datastream and DTVCC caption streams 4 DTVCC Transport Layer Table 1 DTVCC Protocol Stack The DT
22、VCC Transport Layer is where DTVCC data leave the DTV Video subsystem and are introduced to the DTV Closed-Caption decoder. Within the DTVCC decoder, DTVCC data are further processed up through the remaining layers of the DTVCC Protocol Model. Both the CEA-608-C datastream and DTVCC data are carried
23、 in this layer. NOTEThe DTVCC Transport layer should not be confused with the main system transport layer. For example, in MPEG-2 ATSC systems, the MPEG-2 transport layer is defined in ISO 13818-1, and this transport layer carries video, audio, data and control streams. DTVCC bits are encoded within
24、 the video signal conforming with ISO 13818-2. These bits enter the DTVCC decoder from the video streams user data structure. CEA-708-C specifies a method of placing a CEA-608-C datastream, embedded in the CEA-708-C signal, into the correct bit positions and fields in an NTSC signal, but CEA-708-C d
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- CEA 708 2006
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