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While digital video interconnects (such as DVI and HDMI) generally do have a "vertical blanking" part of the datastream, they are unable to carry closed caption text or most of the other items that, in analog TV interconnects, are transmitted during the "vertical blanking interval". This can lead to
221:
require none, but the standards were established when the delay was needed (and to allow the continued use of older equipment). Blanking of a CRT may not be perfect due to equipment faults or brightness set very high; in this case a white retrace line shows on the screen, often alternating between
140:
213:; the magnetic field, and hence the position being drawn, cannot change instantly. Additionally, the speed of older circuits was limited. For horizontal deflection, there is also a pause between successive lines, to allow the beam to return from right to left, called the
286:
On many consoles there is an extended blanking period, as the console opts to paint graphics on fewer lines than the television would natively allow, permitting its output to be surrounded by a border. On some very early machines such as the
187:
and there can be a VBI after each frame or field. In interlaced video a frame is made up of 2 fields. Sometimes in interlaced video a field is called a frame which can lead to confusion.
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171:, is the time between the end of the final visible line of a frame or field and the beginning of the first visible line of the next frame or field. It is present in analog television,
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do not supply image information during the blanking period. Digital displays usually will not display incoming data stream during the blanking interval even if present.
291:, the programmer is in full control of video output and therefore may select their own blanking period, allowing arbitrarily few painted lines. On others such as the
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fairly steep diagonals from right to left and less-steep diagonals back from left to right, starting in the lower right of the display.
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The VBI was originally needed because of the inductive inertia of the magnetic coils which deflect the electron beam vertically in a
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scheme inserts pulses in the VBI, where the recorder expects a constant level, to disrupt recording to videotapes.
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The pause between sending video data is sometimes used in real time computer graphics to modify the
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use the known black level of the vertical blanking pulse to set their recording levels. The
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1135×624 4fsc decoded frame (Luma) from a
Composite 4fsc decode of a LaserDisc via
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is usually supplied during this period to avoid painting the retrace line—see
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In analog television systems the vertical blanking interval can be used for
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closed captioning § Digital television interoperability issues
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use) and other digital data can be sent during this time period.
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In U.S. analog broadcast television, line 19 was reserved for a
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service contemplated the use of line 22 for data transmission.
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copy-protection indicators, and various data encoded by the
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67:. Unsourced material may be challenged and removed.
295:, a predefined blanking period could be extended.
179:and other signals. Here the term field is used in
2089:Weise, Marcus; Weynand, Diana (12 October 2012).
2172:Digital Video and HD: Algorithms and Interfaces
1411:
372:
8:
313:Vertical blanking interval in digital video
30:For vertical intervals in cartography, see
2121:. Taylor & Francis. 12 November 2012.
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127:Learn how and when to remove this message
1845:Output power of an analog TV transmitter
1267:
1265:
138:
2081:
1249:
1259:Also used in China's DVB-S/S2 network.
2169:Poynton, Charles (27 February 2012).
1875:Direct-broadcast satellite television
1255:
1253:
27:Time between drawing frames or fields
7:
2196:Compesi, Ronald (19 November 2015).
202:for details; signal sources such as
65:adding citations to reliable sources
2118:Broadcast Engineer's Reference Book
1765:Vestigial sideband modulation (VSB)
2199:Video Field Production and Editing
25:
183:, and the term frame is used in
41:
1760:Quadrature amplitude modulation
52:needs additional citations for
1924:Television channel frequencies
268:captioning data. The obsolete
1:
1895:Digital television transition
1724:Multichannel television sound
764:Field-sequential color system
293:Nintendo Entertainment System
264:and line 21 was reserved for
2142:Jack, Keith (8 April 2011).
1967:Field strength in free space
1668:Horizontal blanking interval
1344:Reverse Standards Conversion
342:Horizontal blanking interval
215:horizontal blanking interval
76:"Vertical blanking interval"
1865:Superheterodyne transmitter
2260:
1703:Vertical blanking interval
157:vertical blanking interval
29:
1678:Nominal analogue blanking
1304:
1293:
1245:
405:
394:
347:Nominal analogue blanking
262:Ghost-canceling reference
2095:. Taylor & Francis.
332:Vertical blank interrupt
1997:Television interference
1870:Television receive-only
388:Broadcast video formats
1919:Microwave transmission
1885:Terrestrial television
1880:Television transmitter
1840:Intermediate frequency
1633:Chrominance subcarrier
1354:Television transmitter
148:
2244:Television technology
1791:Broadcast transmitter
1339:MPEG transport stream
1166:MPEG-1 Audio Layer II
729:Mechanical television
637:Zweikanalton (A2/IGR)
204:television broadcasts
163:), also known as the
142:
2033:Zero reference pulse
2018:Field strength meter
1755:Frequency modulation
1663:Horizontal scan rate
1374:Widescreen signaling
1349:Standards conversion
1334:Moving image formats
249:protocol (e.g., the
61:improve this article
1972:Noise (electronics)
1835:Intercarrier method
1795:Transmitter station
1430:broadcasting topics
1329:Display motion blur
219:thin panel displays
1860:Split sound system
1810:Differential phase
1380:Analogue TV Topics
149:
2209:978-1-317-35110-8
2182:978-0-12-391932-8
2155:978-0-08-055395-5
2128:978-1-136-02417-7
2072:
2071:
1987:Radiation pattern
1805:Differential gain
1427:Analog television
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1392:
1389:
1388:
1289:
1288:
1285:
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1171:MPEG Multichannel
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235:closed captioning
185:progressive video
165:vertical interval
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18:Vertical interval
16:(Redirected from
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1914:Frequency offset
1855:Residual carrier
1800:Cavity amplifier
1698:Television lines
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1413:
1406:
1397:
1369:Video processing
1299:Technical issues
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520:(Color systems:
448:(Color systems:
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192:cathode ray tube
181:interlaced video
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2226:. 11 June 1979.
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2092:How Video Works
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2013:Distortionmeter
2001:
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1830:Frequency mixer
1786:Antenna (radio)
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1653:Composite video
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1364:Video on demand
1309:14:9 compromise
1300:
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1196:MPEG-H 3D Audio
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307:copy protection
251:content ratings
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1734:Sound-in-Syncs
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1319:Digital cinema
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1314:Broadcast-safe
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646:Hidden signals
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632:Sound-in-Syncs
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298:Most consumer
194:displays, the
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2202:. CRC Press.
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2102:9781136069819
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1708:White clipper
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1658:Frame (video)
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1551:Color systems
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1006:MPEG-4 Visual
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231:VITC timecode
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155:display, the
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78: –
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72:Find sources:
66:
62:
56:
55:
50:This article
48:
44:
39:
38:
33:
19:
2218:
2198:
2191:
2175:. Elsevier.
2171:
2164:
2148:. Elsevier.
2144:
2137:
2117:
2111:
2091:
2084:
2059:Hanover bars
1850:Pre-emphasis
1774:Transmission
1739:Zweikanalton
1702:
1643:Color killer
1568:Clear-Vision
920:MPEG-2 Video
682:
458:Clear-Vision
316:
297:
285:
277:frame buffer
274:
259:
224:
208:
189:
168:
164:
160:
156:
150:
123:
114:
104:
97:
90:
83:
71:
59:Please help
54:verification
51:
32:Contour line
2224:"InfoWorld"
2028:VIT signals
2023:Vectorscope
1962:Earth bulge
1944:Propagation
1907:& bands
1905:Frequencies
1688:Raster scan
1628:Chrominance
1618:Black level
1613:front porch
1378:Templates (
1095:MPEG-H HEVC
834:Progressive
352:Raster scan
337:Datacasting
304:Macrovision
227:datacasting
200:raster scan
196:blank level
153:raster scan
2076:References
1957:Distortion
1890:Transposer
1825:Dummy load
1781:Amplifiers
1748:Modulation
1638:Colorburst
1609:Back porch
1222:Captioning
1024:MPEG-4 AVC
792:Interlaced
717:Historical
653:Captioning
612:BTSC (MTS)
587:1250 lines
571:1125 lines
400:Television
289:Atari 2600
190:In raster
87:newspapers
2064:Sparklies
2049:Dot crawl
2042:Artifacts
1982:Path loss
1977:Null fill
1952:Beam tilt
1693:Safe area
1359:Test card
1032:ATSC A/72
938:DVB 3D-TV
550:819 lines
478:625 lines
438:525 lines
420:405 lines
145:ld-decode
117:June 2023
2238:Category
2054:Ghosting
1815:Diplexer
1683:Overscan
1648:Color TV
1541:System F
1537:System E
1533:819-line
1527:System N
1523:System L
1519:System K
1515:System I
1511:System H
1507:System G
1503:System D
1499:System C
1495:System B
1491:625-line
1485:System M
1481:525-line
1476:455-line
1471:441-line
1465:System A
1461:405-line
1456:375-line
1451:343-line
1446:180-line
1271:Defunct.
1237:Teletext
1103:ATSC 3.0
759:567-line
754:455-line
749:441-line
744:375-line
739:343-line
734:180-line
724:Pre-1940
678:Teletext
558:System E
486:System B
446:System M
428:System A
326:See also
270:Teletext
239:teletext
2006:Testing
1588:PALplus
1438:Systems
1118:ISDB-S3
1067:MobaHo!
1014:MobaHo!
783:Digital
530:PALplus
101:scholar
2206:
2179:
2152:
2125:
2099:
1563:NTSC-J
1191:HE-AAC
1113:HD DMB
658:CGMS-A
594:HD-MAC
454:NTSC-J
411:Analog
255:V-chip
243:CGMS-A
169:VBLANK
103:
96:
89:
82:
74:
1729:NICAM
1717:Sound
1602:Video
1593:SECAM
1583:PAL-S
1578:PAL-M
1133:Audio
1085:ABS-S
1057:SBTVD
996:ABS-S
955:ABS-S
898:UHDTV
891:1080p
822:1080i
622:NICAM
604:Audio
534:SECAM
526:PAL-N
468:B-MAC
462:PAL-M
266:NABTS
151:In a
108:JSTOR
94:books
2204:ISBN
2177:ISBN
2150:ISBN
2123:ISBN
2097:ISBN
1992:Skew
1673:Luma
1611:and
1558:NTSC
1227:CPCM
1181:LPCM
1151:AC-4
1141:AC-3
1123:DTMB
1077:AVS2
1062:1seg
1047:DTMB
1037:CMMB
991:DTMB
983:AVS+
973:CMMB
950:DTMB
945:ISDB
928:ATSC
886:720p
881:HDTV
874:576p
869:480p
864:EDTV
857:288p
852:240p
847:1seg
842:LDTV
817:HDTV
810:576i
805:480i
800:SDTV
769:OSKM
698:VITC
688:VEIL
617:EIAJ
578:MUSE
450:NTSC
300:VCRs
281:tear
253:for
80:news
1934:VHF
1929:UHF
1573:PAL
1323:DCI
1232:EPG
1212:AFD
1186:AAC
1176:PCM
1161:DRA
1156:DTS
1145:5.1
1108:DVB
1052:DVB
1042:DMB
965:AVS
933:DVB
708:XDS
703:WSS
693:VIT
683:VBI
673:PDC
668:GCR
663:EPG
627:SAP
540:MAC
522:PAL
247:XDS
211:CRT
177:DVI
173:VGA
167:or
161:VBI
63:by
2240::
1539:,
1525:,
1521:,
1517:,
1513:,
1509:,
1505:,
1501:,
1497:,
1264:^
1252:^
908:8K
903:4K
560:,
532:,
528:,
524:,
516:,
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322:.
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1793:/
1543:)
1535:(
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1463:(
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1321:(
1147:)
1143:(
562:F
536:)
518:N
514:L
510:K
506:I
502:H
498:G
494:D
490:C
464:)
380:e
373:t
366:v
159:(
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130:)
124:(
119:)
115:(
105:·
98:·
91:·
84:·
57:.
34:.
20:)
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