ACO6800
+
Installation and Operation Manual
117
Copyright © 2009, Harris Corporation
Appendix A: Glossary
PAT:
See
Program Association Table.
PCR:
See
Program Clock Reference
.
PES:
See
Packetized Elementary Stream.
PMT:
See
Program Map Table.
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 and System Information Protocol (PSIP):
Information sent out as
part of an ATSC transport stream that lists all of the video, audio, data, and
program information contained in the stream. This is the "TV guide" for a given
stream.
Program Association Table (PAT):
A list of all programs in the ATSC data
stream.
Program Clock Reference (PCR):
A time reference signal placed in MPEG
streams to coordinate various data streams.
Program Map Table (PMT):
A listing of all elementary streams that comprise
a complete (television) program.
PSIP:
See
Program and System Information Protocol
.
Segment Error Rate (SER):
A calculated average of uncorrected transport
stream packets vs. total packets as accumulated over a designated period.
Rating Region Table (RRT):
Defines the TV parental guideline (rating
information) system referenced by any content advisory descriptor carried
within the Transport Stream.
SMPTE:
Society of Motion Picture and Television Engineers.
Standard Definition Television (SDTV):
Signifies a digital television system
in which the quality is approximately equivalent to that of NTSC. This
equivalent quality may be achieved from pictures originated at the 4:2:2 level of
ITU-R BT.601 and subjected to processing as part of the bit rate compression.
The results should be such that when judged across a representative sample of
program material, subjective equivalence with NTSC is achieved. The
displayed picture may be either the traditional 4:3 or the wide-screen 16:9
aspect ratio.
Service Description Table (SDT):
l
ists the names and other parameters of the
services within transport stream.
System Time Table (STT):
defines the current date and time of day.
Transport Stream—ATSC (TS):
Consists of the following: (1) Packets: 188
bytes, fixed length with descriptive data; (2) Carries several programs; (3) a PID
that identifies the type of TS packet (video, audio, other); and (4) carries
descriptive information about the program.
Terrestrial Virtual Channel Table (TVCT):
Defines the Mpeg-2 programs
embedded in the Transport Stream in which the TVCT is carried