1 Scope
This standard defines a method of coding which
allows data services to be carried in the vertical ancil-
lary data space of a bit-serial component television
signal conforming with SMPTE 292M or ANSI/SMPTE
259M.
This includes data broadcast services intended for the
public as well as broadcaster internal control and
communications.
Despite the reference to the bit-serial interface,
nothing in this specification precludes its use in a
parallel digital interface for component digital video
signals.
The data described in this standard may also be
transported in KLV format according to SMPTE 336M,
or via other means.
2 Normative references
The following standards contain provisions which,
through reference in this text, constitute provisions of
this standard. At the time of publication, the editions
indicated were valid. All standards are subject to
revision, and parties to agreements based on this
standard are encouraged to investigate the possibility
of applying the most recent edition of the standards
indicated below.
ANSI/SMPTE 125M-1995, Television — Component
Video Signal 4:2:2 — Bit-Parallel Digital Interface
ANSI/SMPTE 259M-1997, Television — 10-Bit 4:2:2
Component and 4
f
sc
Composite Digital Signals —
Serial Digital Interface
SMPTE 291M-1998, Television — Ancillary Data
Packet and Space Formatting
SMPTE 292M-1998, Television — Bit-Serial Digital
Interface for High-Definition Television Systems
ANSI/EIA-608-1994, Recommended Practice for Line
21 Data Service
EIA-708-B, Digital Television Closed-Captioning
(DTVCC)
EIA-766-1998, U.S. Region Rating Table (RRT) and
Content Advisory Descriptor for Transport of Con-
tent Advisory Information Using ATSC A/65 Program
and System Information Protocol (PSIP)
3 Location of vertical ancillary data
The data packets are located in the active line portion
of one or more lines in the vertical ancillary space.
Data may be located in any lines in the area from the
second line after the line specified for switching to the
last line before active video, inclusively.
Individual data services are not assigned to any spe-
cific data lines; receiving equipment should identify
and select services on the basis of their ANC DID and
SDID fields.
Because ANC data may be located in the lines imme-
diately preceding active video, manufacturers of video
compression equipment should ensure that these
data bits are not included in video compression cal-
culations.
The chrominance (C
b
/C
r
) and luminance (Y) data are
carried in two separate streams within the SMPTE
292M signal with their own ANC data flags and CRCs.
Approved
May 12, 2000
Copyright © 2000 by THE SOCIETY OF
MOTION PICTURE AND TELEVISION ENGINEERS
595 W. Hartsdale Ave., White Plains, NY 10607
(914) 761-1100
for Television —
Vertical Ancillary Data Mapping
for Bit-Serial Interface
SMPTE 334M-2000
SMPTE STANDARD
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