ANSI CTA:2020-2007 pdf download.Other VBI Waveforms.
CEA-2020, specifies four Vertical Blanking Interval (VBI) waveforms in commercial use. The electrical properties of the waveforms are covered, but the meaning of the payload data is not.
The waveforms apply to 525-line, interlaced (i.e. 480i) analog television signals.
The waveforms may be present on analog inputs and analog outputs, but no conformance requirements about the actual presence of the waveforms are defined in CEA-2020.
2 References
2.1 Normative References
The following standards contain provisions that, through reference in this text, constitute normative provisions of ANSI CTA. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on ANSI CTA are encouraged to investigate the possibility of applying the most recent editions of the standards listed in Section 2.1.1.
2.1.1 Normative Reference List CEA-608-C, Line 21 Data Services, August 2005
SMPTE 1 70M, SMPTE Standard for Television—Composite Analog Video Signal—NTSC for Studio Applications, 2004
2.1.2 Normative Reference Acquisition CEA 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://global.ihs.com; Email globalihs.com
SMPTE Standards:
• Society of Motion Picture and Television Engineers (SMPTE), 3 Barker Aye, White Plains, NY 10601; Phone 914-761-1100; Fax 914-761-3115; Internet http://www.smpte.org
2.2 Informative References
2.2.1 Informative Reference List
CEA-805-C, Data on the Component Video Interfaces, April 2006
CEA-516, Joint EIA/CVCC Recommended Practice for Teletext: North American Basic Teletext Specification (NABTS), 1988
IEC 61880 (1998-01), Video systems (525/60) — Video and accompanied data using the vertical blanking interval — Analogue interface
2.2.2 Informative Reference Acquisition CEA 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://global.ihs.com; Email gIobalihs.com
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 http://global.ihs.com; Email globalihs.com
• IEC Central Office, 3, rue de Varembe, P0 Box 131, CH-1211 Geneva 20, Switzerland; Phone +41 2291902 11; Fax +41 229190300; Internet http://www.iec.ch; Email pubinfor@iec.ch
4 Waveform Summary
CEA-2020 is intended to aid in the identification, encoding and decoding of VBI waveforms used for the transport of AMOL, TVGIx and TVG2x payloads. Creation, modification or end-use of the payload data itself is not covered here.
These waveforms may be encoded for broadcast on lines 10 through 25. Line 10 is often used as a clamp line by analog equipment and placing data on it may render that equipment inoperable. Line 19 is primarily used for ghost cancelling, and is reserved for this purpose in terrestrial broadcasting. Line 21 is primarily used for data structures defined in CEA-608-C, and is reserved for this purpose in terrestrial broadcasting.
Lines 22 through 25 are part of the active picture area, and their use for data transport in broadcast television require the permission of the FCC.
The common industry terms, “AMOL”, “AMOL I”, and “AMOL II” refer to combinations of payloads and waveforms and do not directly map to the waveforms defined here as AMOL-48 and AMOL-96.
The line numbering system used refers to the video as 262 lines per field starting with line 1, 2 fields per frame (interlaced), 29.97 frames per second.
Levels are indicated in Institute of Radio Engineers (IRE) standard units, as defined in SMPTE 170M Annex B.ANSI CTA pdf download.