CMN-91
Appendix C
Installation and Operation Manual
Glossary
© 2016 Imagine Communications Corp. Proprietary and Confidential.
Revision D | Page 179
Glossary
601 An international standard (ITU-R BT.601) for component digital television. It defines the sampling
systems, matrix values, and filter characteristics for digital television.
8 VSB Vestigial sideband modulation with 8 discrete amplitude levels.
16 VSB Vestigial sideband modulation with 16 discrete amplitude levels.
Active Format Description (AFD) An ancillary data packet in a digital video interface for the purpose of
describing certain spatial characteristics of a high definition or standard definition video image.
Formatted according to SMPTE 2016, AFD information is intended to guide video equipment regarding
the presentation of video of one aspect ratio on a display of another aspect ratio. Bar Data information
is used to signal the precise unused areas of active video when the active image does not completely fill
the picture area, in particular widescreen cinema material carried letterboxed in a frame with bars top
and bottom
Advanced Television Systems Committee (ATSC) The parent organization that developed, tested and
described the form and function of the US digital television formats.
AES/EBU A digital audio standard established jointly by the Audio Engineering Society (AES) and the
European Broadcasting Union (EBU).
Anchor Element The perceptual loudness reference point or element around which other elements are
balanced in producing the final mix of the content, or that a reasonable viewer would focus on when
setting the volume control.
Artifacts Unwanted visible effects in the picture created by disturbances in the transmission or image
processing, such as edge crawl or ‘hanging dots’ in analog pictures or ‘pixelation’ in digital pictures.
Aspect Ratio The ratio of horizontal to vertical dimensions. A square has an aspect of 1:1 since the
horizontal and vertical measurements are always equal. Current television screen aspect ratios are 4:3
and 16:9.
Asynchronous Serial Interface (ASI) A transmission method adopted by the DVB, and called DVB-ASI.
The transmission method allows for the transport of varying data payloads in a constant data stream.
The DVB-ASI transport stream rate is 270 Mb/s.
ATC A transmission method adopted by the DVB, and called DVB-ASI. The transmission method allows
for the transport of varying data payloads in a constant data stream. The DVB-ASI transport stream rate
is 270 Mb/s.
Audio Breakaway Routing video and accompanying audio in separate signal paths.
Audio-Follow Routing video and accompanying audio together in the same signal path.
Auto Trans Automatic transition. The execution of a single wipe or fade from current picture to another
picture by way of an automatic device.
Appendix C