
Appendix D
♦
Glossary
140
CMN-41 Series Installation and Operation Handbook
Copyright © 2009, Harris Corporation
NTSC
National Television Systems Committee, the color television system used in the
United States, Canada, Mexico and Japan.
NVRAM
Nonvolatile RAM
Packet Identifier (PID)
A unique integer value used to associate elementary streams
of a program in a single or multi-program transport stream.
Packet
A packet consists of a header followed by a number of contiguous bytes from
an elementary data stream. It is a layer in the system coding syntax.
Packetized Elementary Stream (PES)
The data structure used to carry elementary
stream data. The packets consist of a header followed by payload data, and a stream is
a series of packets which form an elementary stream and have a single stream
identification.
PAL
Phase Alternation Line; the standard color television system in many European
and other countries.
Passive Looping
Video and audio signals routed through components, even if power
is removed. Signals are not amplified or processed, maintaining transparency.
Payload Identifier
see Video Payload ID.
Pedestal Level
An offset used in a video system to separate the active video from the
blanking level by maintaining the black level above the blanking level by a small
amount.
Pixel
A Picture cell or Picture element representing one sample of picture information,
such as an individual sample of R, G, B, luminance or chrominance.
Preset
Refers to establishing any condition prior to use on the Program output. This
term is used in reference to wipe patterns and is often interchanged with Preview.
Preview
The video output channel used to view the intended Program results prior to
the execution of the next transition.
PRO Audio
A transmitted audio channel for talent cueing via Interrupt Foldback
(IFB) to ENG vans and remote applications. Some demodulators support PRO audio
monitoring.
Program
A transport stream combination of a video stream and one or more audio
and data streams associated with that video stream. In analog terms, “Program” refers
to the Base Band video and audio produced by the final output of a switcher.
Program Association Table (PAT)
A list of all programs that are in the ATSC
data stream.
Program Map Table (PMT)
A listing of all elementary streams that comprise a
complete (television) program.