Introduction to the Basic Encoder
Reference Guide: evolution 5000 E5780 and E5782 Encoder
Page 1-9
ST.RE.E10135.4
NOTES…
1.
VBI in Picture transmits the VBI waveform as part of the picture and as such will be subject to
some distortion. Most analogue VBI types are robust against this type of distortion but others,
e.g. video index, are intended for SDI transmission and will not survive MPEG coding/decoding
in VBI in Picture mode. VITS test signal and ghost cancellation signal will become corrupted.
2.
VBI in Picture is not supported when 3:2 Pull-down is active.
VBI User Data
Closed Caption data, together with other formats such as VITC and AFD, can be transmitted
in the user data field of the video or relevant part of the video stream.
VBI in PID
The Encoder has the ability to extract and transmit a wide variety of VBI line formats. Circuitry
on the front-end of the equipment incorporates a number of general purpose line grabbers so
that known formats of VBI data can be extracted.
The following VBI data formats are supported:
•
Line 21 (fields 1 and field 2) data Services EIA-608 (Closed Caption and V-chip)
•
Neilson AMOL 1, Neilson AMOL 11
•
VITC
7
(EBU and SMPTE)
•
Programme Delivery Control (PDC), via ITU-R system B Teletext extension data packets
of type 8/30, format 2 and Line 16 Video Programme System (VPS). Video Programming
Teletext (VPT) and VPS are trade names
•
Wide Screen Signalling (WSS) (line 23) ETS 300 294
•
Video Index (for Pan Scan, Aspect Ratio and Active Format Descriptor) (SD-SDI input
only)
•
The supported VBI line number range is 10-22 and 272-285 for 525 lines and 6-22 and
318-334 for 625 lines
Teletext Extraction
The Encoder supports internal Teletext data extraction (Teletext drop) from the VBI of a video
input and formats this data into a transport packet, as specified in the DVB specification
EN300-472. The Encoder can extract up to 18 lines of Teletext from each field of the video
frame.
Line filters can be invoked to selectively disable any individual lines in this range. The filters
are provided to allow the user to ensure that non-Teletext lines (e.g. ITS lines) are not
erroneously extracted. The extracted Teletext lines are formatted into PES packets according
to the DVB specification. The Teletext PES packets are time stamped to allow correct
alignment of subtitling captions with decoded video.
The following Teletext services are extractable:
•
Sytem B (WST) Teletext
•
Video Programming Teletext (VPT), PDC (Packet 8/30 format 2)
•
Inverted Teletext
1.2.4
High Definition (HD) Closed Captions and Teletext
High Definition mode only supports Closed Caption and Teletext insertion. AFD information
can also be signalled in the video user data – signalled by contact closure.
7
VITC (EBU and SMPTE), only timecode extracted.
Содержание E5780
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Страница 232: ...Technical Specification Page B 22 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
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Страница 268: ...Accuracy of Frequency Sources Page G 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 270: ...Use of Remux Card in ASTC Page H 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...