《CEA-2020-2006.pdf》由会员分享，可在线阅读，更多相关《CEA-2020-2006.pdf（26页珍藏版）》请在三一文库上搜索。
1、 CEA Standard Other VBI Waveforms CEA-2020 August 2006 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:01:20 MDTNo reproduction or networking permitted without license from IHS -,-,-
2、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 improvement of products, and assisting the purchaser in selecting and obtaining w
3、ith 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 selling products not conforming to such Standards, Bulletins or other technical
4、 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 internationally. Standards, Bulletins and other technical publications are adop
5、ted 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 adopting the Standard, Bulletin or other technical publication. Note: The users a
6、ttention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard, no position is taken with respect to the validity of this claim or of any patent rights in connection therewith. The patent holder has,
7、however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. This CEA Standard is considered to have International Standardization
8、implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulato
9、ry requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (Formulated under the cognizance of the CEA R4.3 Television Data Systems Committee.) Published by C
10、ONSUMER ELECTRONICS ASSOCIATION 2006 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email SMPTE Standards: Society of Motion Picture and Television Engineers (SMPTE), 3 Barker Ave, White Plains, NY 10601; Phone 914-761-1100; Fax 914-761-3115; Internet http:/www.smpte.org 2.2 Info
11、rmative 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 dat
12、a 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:/; Email IEC Standards: Global
13、Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740; Internet http:/; 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
14、:/www.iec.ch; Email pubinforiec.ch 3 Definitions 1 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:01:20 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-
15、2020 3.1 Acronyms and Abbreviations The following acronyms and abbreviations are used in CEA-2020: AMOL Automated Measurement of Lineups FCC Federal Communications Commission IEC International Electrotechnical Commission IRE Institute of Radio Engineers NABTS North American Basic Teletext Specificat
16、ion NRZ Non-Return to Zero NTSC National Television Systems Committee II SD Short-Time Distortion SMPTE Society of Motion Picture and Television Engineers SOM Start of Message TBC Time Base Corrector VBI Vertical Blanking Interval 4 Waveform Summary CEA-2020 is intended to aid in the identification,
17、 encoding and decoding of VBI waveforms used for the transport of AMOL, TVG1x 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 equ
18、ipment 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 broadc
19、asting. 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 wavef
20、orms 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 Anne
21、x B. 5 Automated Measurement of Lineups (AMOL) Waveforms 5.1 AMOL Signal Overview 5.1.1 Signal Locations AMOL shall be encoded with either 48 bits per field or 96 bits per field, corresponding to 1 Mbps or 2 Mbps respectively. It is typically encoded on lines 20 and/or 22 and in one or both fields,
22、however, it may appear on any VBI line, and both 48- and 96-bit forms may be mixed in the same signal. See Table 1. 2 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:01:20 MDTNo repro
23、duction or networking permitted without license from IHS -,-,- CEA-2020 Typical Locations Possible Bitrates Line 20, field 1 1 Mbps or 2 Mbps Line 20, field 2 1 Mbps or 2 Mbps Line 22, field 1 1 Mbps or 2 Mbps Line 22, field 2 1 Mbps or 2 Mbps Table 1 Locations and Possible Bitrates 5.1.2 Data Modul
24、ation The data (bit) is modulated such that each state corresponds to a binary state (0 or 1), and a transition occurs only when there is a change in the data between adjacent bits from a “1” to “0” or “0” to “1”. This is commonly referred to as “non-return to zero” (NRZ) encoding and is illustrated
25、 in Figure 1. bit 1 Figure 1 NRZ Encoding Technique There are two bit rates and two corresponding Start of Message (SOM) bit sequences as shown in Table 2. Bit rate Start of Message (SOM) Number of Bits per line 1 Mbps 1010110 48 2 Mbps 11110010 96 Table 2 SOM and Bits per Line The SOM is included i
26、n the total bits per line. It is important to understand that, for the purposes of passing the AMOL signal for present and future applications, it is assumed that all bits following the SOM can have any value or combination. 5.2 AMOL 48-bit Encode Bit Timing Specifications Timing threshold specifica
27、tions for equipment that encodes the AMOL 48-bit signal shall be as shown in Figure 2. bit width bit 2 bit 6 bit 4bit 3bit 5 “1” “1” “0”“1”“0”“1” 3 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 0
28、3/30/2007 21:01:20 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-2020 white 100 IRE level Figure 2 Bit Encoding Tolerances 48 bit 5.2.1 Starting Time The start time ts shall be the time from the leading edge of the horizontal sync pulse to the leading edge of the firs
29、t bit. The start time ts shall be 12 microseconds (s), 1.0 s, with a long term stability of 0.1 s per second. Referring to Figure 2, the first data bit of the 48-bit message starts 12 s 1 s after the leading edge of the horizontal sync pulse. 5.2.2 Bit Interval The bit intervals shall be 1 s 0.1 s.
30、The rise-time shall be 250 nanoseconds (ns) typical, 200 ns minimum, 300 ns maximum, measured from 10% to 90%. The bits are transitioned using the NRZ (non- return-to-zero) encoding technique. 5.2.3 Cumulative Error The cumulative error for the bit interval over 48 bits in one line shall not exceed
31、0.4 s. 5.2.4 Data Bit Amplitude Level The data is in binary code. “1“ = 50 IRE units, - 0 to + 10 IRE units “0“ = 0 IRE units, - 0 to + 10 IRE units 5.2.5 Spurious Signals Spurious signals, overshoot and undershoot on the bits shall not be more than 2 IRE units. “0” -40 IRE 0 IRE 10 IRE 50 IRE 60 IR
32、E “1” bit blank level color burst 20 IRE -20 IRE bit 1bit 27bit 48 hshs bit width 1 s .1 s 0 rise time 250 ns 0 ns 5 fall time 250 ns 50 ns cumulative error not more than .4 us Legend: hs - horizontal sync s - microsecond ns - nanosecond 12 us 1 - us + - + - + - + sync level not to scale 4 Copyright
33、 Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:01:20 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-2020 5.3 AMOL 48-bit Decode Bit Timing Specifications Timing
34、 threshold specifications for equipment that decodes the AMOL signal shall be as shown in Figure 3. Note that the encoding specifications are tighter than decoding specifications to allow for distortions introduced by processing equipment in the video distribution path. white 100 IRE level Figure 3
35、Bit Decoding Tolerances 48 bit 5.3.1 Starting Time The start time ts shall be the time from the leading edge of the horizontal sync pulse to the leading edge of the first bit. The start time ts shall be 12 s typical, - 5 to + 3 s. Referring to Figure 3, notice that the first data bit of the 48-bit m
36、essage starts 12 s (- 5 to + 3 s) after the leading edge of the horizontal sync pulse. 5.3.2 Bit Interval The bit intervals shall be 1 s 0.3 s. The rise-time shall be 250 ns typical, 125 ns minimum, 500 ns maximum, measured 10% to 90%. The bits are transitioned using the NRZ (non-return-to-zero) enc
37、oding technique. 5.3.3 Cumulative Error The cumulative error for the bit interval over 48 bits in one line shall not exceed 0.5 s. 5.3.4 Spurious Signals Spurious signals, overshoot and undershoot on the bits shall not be more than 2 IRE units. sync level “0” bit -40 IRE 0 IRE 50 IRE 70 IRE “1” bit
38、blank level color burst 20 IRE -20 IRE bit 1bit 27bit 48 hs hs bit width 1 us 0.3 us cumulative error not more than .5 us rise time 250 ns typical fall time 250 ns typical Legend: hs - horizontal sync us - microsecond ns - nanosecond 12 s -5 to +3 s 30 IRE + - -5 IRE not to scale 5 Copyright Consume
39、r Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:01:20 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-2020 5.4 AMOL 96-bit Encode Bit Timing Specifications Timing thresho
40、ld specifications for equipment that encodes the 96-bit (2 Mbps) signal shall be as shown in Figure 4. 1 white Figure 4 Bit Encoding Tolerances 96 bit 5.4.1 Starting Time The start time shall be the time from the leading edge of the horizontal sync pulse to the leading edge of the first bit. The sta
41、rt time shall be 12 s 1.0 s, with a long term stability of 0.1 s per second. Referring to Figure 4, the first data bit of the 96-bit message starts 12 s 1 s after the leading edge of the horizontal sync pulse. 5.4.2 Bit Interval The bit intervals shall be 0.5 s 0.05 s. The rise-time shall be 125 ns
42、25 ns, measured 10% to 90%. The bits are transitioned using the NRZ (non-return-to-zero) encoding technique. 5.4.3 Cumulative Error The cumulative error for the bit interval over 96 bits in one line shall not exceed 0.2 s. 5.4.4 Data Bit Amplitude Level The data is in binary code: sync level “0” -40
43、 IRE 0 IRE 10 IRE 50 IRE 60 IRE 00 IRE “1” bit level blank level color burst 20 IRE -20 IRE bit 1bit 47bit 96 hshs bit width .5 us .05 us cumulative error not more than .4 us rise time 125 ns 25 ns fall time 125 ns 25 ns Legend: hs - horizontal sync us - microsecond ns - nanosecond 12 us not to scal
44、e 1 us+ - + - + - - 6 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:01:20 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-2020 “1“ = 50 IRE units, - 0
45、to + 10 IRE units “0“ = 0 IRE units, - 0 to + 10 IRE units 5.4.5 Spurious Signals Spurious signals, overshoot and undershoot on the bits shall not be more than 2 IRE units. 5.5 AMOL 96-bit Decode Bit Timing Specifications Timing threshold specifications for equipment that decodes the 96-bit (2 Mbps)
46、 signal shall be as shown in Figure 5. The encoding specifications are tighter than decoding specifications to allow for distortions introduced by processing equipment in the video distribution path. AMOL 96-bit specifications are the same except for bit width (1s) and number of bits (48). Figure 5
47、Bit Decoding Tolerances 96 bit 5.5.1 Starting Time The start time shall be the time from the leading edge of the horizontal sync pulse to the leading edge of the first bit. The start time shall be 12 s typical - 5 to + 3 s. Referring to Figure 5, notice that the first data bit of the 96-bit message
48、starts 12 s (- 5 to + 3 s) after the leading edge of the horizontal sync pulse. 5.5.2 Bit Interval The bit intervals shall be 0.5 s 0.15 s. The rise-time shall be 125 ns typical, 250 ns maximum, measured 10% to 90%. The bits are transitioned using the NRZ (non-return-to-zero) encoding technique. sync level “0” bit -40 IRE 0 IRE 30 IRE 50 IRE 70 IRE 1 level white 00 IRE “1” bit blank le