1、 ANSI/CTA Standard Other VBI Waveforms ANSI/CTA-2020 R-2014 (Formerly ANSI/CEA-2020 R-2014) December 2007 NOTICE Consumer Technology Association (CTA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufac
2、turers and purchasers, facilitating interchangeability and improvement 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 p
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10、 or other material should be made to the Consumer Technology Association. (Formulated under the cognizance of the CTA R4.3 Television Data Systems Subcommittee.) Published by CONSUMER TECHNOLOGY ASSOCIATION 2015 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; Email SMPTE Standards
11、: 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 Informative References 2.2.1 Informative Reference List CEA-805-C, Data on the Component Video Interfaces, April 2006 CEA-516, Jo
12、int 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 Engin
13、eering 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 Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-3
14、97-2740; 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:/www.iec.ch; Email pubinforiec.ch 3 Definitions 1CEA-2020 3.1 Acronyms and Abbreviations The following acronyms and abbrevia
15、tions 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 Specification NRZ Non-Return to Zero NTSC National Television Systems Committee I
16、I 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, encoding and decoding of VBI waveforms used for the transport of AMOL,
17、 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 equipment and placing data on it may render that equipment inoperable. Lin
18、e 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 th
19、eir 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 use
20、d 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. 5 Automated Measurement of Lineups (AMOL) Waveforms 5.1 AMOL Signa
21、l 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, however, it may appear on any VBI line, and both 48- and 96-bit forms m
22、ay be mixed in the same signal. See Table 1. 2CEA-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 Modulation The data (b
23、it) 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 in Figure 1. bit
24、 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 in the total bits
25、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 specifications for equipme
26、nt that encodes the AMOL 48-bit signal shall be as shown in Figure 2. bit width bit 2 bit 6 bit 4bit 3 bit 5“1” “1” “0” “1” “0” “1”3CEA-2020 white 100 IRElevel Figure 2 Bit Encoding Tolerances 48 bit 5.2.1 Starting Time The start time tsshall be the time from the leading edge of the horizontal sync
27、pulse to the leading edge of the first 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 T
28、he bit intervals shall be 1 s 0.1 s. 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 4
29、8 bits in one line shall not exceed 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. “
30、0” -40 IRE0 IRE10 IRE50 IRE60 IRE“1” bit blanklevelcolorburst20 IRE-20 IREbit 1 bit 27 bit 48hshsbit width1 s.1 s 0rise time250 ns0 ns 5fall time250 ns50 nscumulative error not more than .4 usLegend:hs - horizontal syncs - microsecondns - nanosecond 12 us 1- us+- +-+-+synclevelnot to scale4CEA-2020
31、5.3 AMOL 48-bit Decode Bit Timing Specifications Timing 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
32、 video distribution path. white 100 IRElevel Figure 3 Bit Decoding Tolerances 48 bit 5.3.1 Starting Time The start time tsshall 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 Fig
33、ure 3, notice that the first data bit of the 48-bit message 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 ar
34、e transitioned using the NRZ (non-return-to-zero) encoding 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. sy
35、nc level “0” bit -40 IRE0 IRE 50 IRE70 IRE“1” bit blank levelcolorburst20 IRE-20 IREbit 1 bit 27 bit 48hshsbit width1 us0.3 us cumulative error not more than .5 usrise time250 nstypicalfall time250 nstypicalLegend:hs - horizontal sync us - microsecondns - nanosecond 12 s -5 to +3 s 30 IRE+-5 IREnot
36、to scale5CEA-2020 5.4 AMOL 96-bit Encode Bit Timing Specifications Timing threshold specifications for equipment that encodes the 96-bit (2 Mbps) signal shall be as shown in Figure 4. 1white Figure 4 Bit Encoding Tolerances 96 bit 5.4.1 Starting Time The start time shall be the time from the leading
37、 edge of the horizontal sync pulse to the leading edge of the first bit. The start timeshall 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 I
38、nterval The bit intervals shall be 0.5 s 0.05 s. The rise-time shall be 125 ns 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
39、. 5.4.4 Data Bit Amplitude Level The data is in binary code: sync level“0” -40 IRE 0 IRE 10 IRE 50 IRE 60 IRE 00 IRE “1” bit levelblanklevelcolorburst 20 IRE -20 IRE bit 1 bit 47 bit 96 hshsbit width.5 us.05 uscumulative error not more than .4 usrise time 125 ns 25 nsfall time125 ns25 nsLegend: hs -
40、 horizontal sync us - microsecond ns - nanosecond 12 usnot to scale1 us+- +-+ +- - 6CEA-2020 “1“ = 50 IRE units, - 0 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 9
41、6-bit Decode Bit Timing Specifications Timing threshold specifications for equipment that decodes the 96-bit (2 Mbps) 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 di
42、stribution path. AMOL 96-bit specifications are the same except for bit width (1s) and number of bits (48). Figure 5 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
43、timeshall be 12 s typical - 5 to + 3 s. Referring to Figure 5, notice that the first data bit of the 96-bit message 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 n
44、s 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 1levelwhite 00 IRE “1” bit blanklevelcolorburst 20 IRE -20 IRE bit 1 bit 47 bit 96 hshsbit width.5 us.15 usrise time125 ns 25 ns fall
45、time125 ns25 nscumulative error not more than .5 usLegend: hs - horizontal sync us - microsecond ns - nanosecond 12 us +3 -5 us not to scale-5 IRE +-+ +- - 7CEA-2020 5.5.3 Cumulative Error The cumulative error for the bit interval over 96 bits in one line shall not exceed 0.25 s. 5.5.4 Data Bit Ampl
46、itude Level The data is in binary code. “1“ = 50 IRE units, + 20 to - 20 IRE units “0“ = 0 IRE units, studio quality + 20 to - 5 IRE units B-grade reception quality + 20 to - 20* IRE units * Because this section covers signals received under all types of real world TV broadcast signal conditions, th
47、is wider range should be anticipated. 5.5.5 Spurious Signals Spurious signals, overshoot and undershoot on the bits shall not be more than 10 IRE units. 5.6 System Considerations 5.6.1 Synchronization of AMOL and Video A set of bits associated with a given frame/field of video shall remain associate
48、d with that frame/field. Delaying or advancing the AMOL data with respect to the active video information will cause erroneous reporting to occur. 5.6.2 Shifted AMOL signals Although lines 20 and 22 of fields one and two are authorized by the FCC for AMOL use, the data can appear in other scan lines
49、 due to unintentional shifting caused by tape machines, time base correctors, compression equipment, editing equipment, and the like. For example, although it is specified to expect AMOL on line 20 and/or line 22, it is possible to find these “signals” shifted up or down one or two lines (or more) and/or shifted to the opposite field location. Receiving equipment that is designed to pass the AMOL signal, suc
