Ericsson SVP 2000, Reference Manual, Page: 169 / 196

Glossary
PLL Phase-Locked Loop. A phase-locked loop is a control system which
controls the rotation of an object by comparing its rotational position
(phase) with another rotating object as in the case of a sine wave or
other repeating signal. This type of control system can synchronize
not only the speed, but also the angular position of two waveforms
that are not derived from the same source.
PMT Program Map Table: Part of the MPEG-2 Program Specific
Information (PSI) data and is mandatory for MPEG-2 compliance.
Each service has a PMT, which lists the component parts
(elementary streams of video, audio, etc.) for the various services
being transmitted.
P-picture/P-frame A picture / frame produced using forward prediction. It contains
predictions from either previous I frames or previous P frames. The
P frame is used as a reference for future P or B frames.
ppm Parts per million.
PPV Pay Per View: A system of payment for viewing services based on a
usage / event basis rather than on on-going subscription.
Subscribers must purchase viewing rights for each PPV event that
they wish to view. PPV events may be purchased as IPPV or OPPV.
Profile (MPEG-DASH) a combination of service allocation, output video
size, frame rate, video bit rate, audio bit rate, and all other
parameters defining an audio/video stream output format.
Program PC - A sequence of instructions for a computer.
TV - A concept having a precise definition within ISO 13818-1
(MPEG-2). For a transport stream, the timebase is defined by the
PCR. The use of the PCR for timing information creates a virtual
channel within the stream.
Programme A linking of one or more events under the control of a broadcaster.
For example, football match, news, film show. In the MPEG-2
concept, the collection of elementary streams comprising the
programme, have a common start and end time. A series of
programmes are referred to as events.
P
R
P
B
Analogue Color difference signals. Refer to C
R
C
B
for an explanation.
PROM Programmable Read-Only Memory: A device, which may be written
once with data for permanent storage, and then read whenever
required. Special types of PROM permit the erasure of all data by
Ultraviolet light (EPROM) or by application of an electronic signal
(EEPROM).
PS Program Stream: A combination of one or more PESs with a
common timebase.
PSI Program Specific Information: Consists of normative data, which is
necessary for the de-multiplexing of transport streams and the
successful regeneration of programs (see also: SI).
PSIP Program System Information Protocol: The ATSC equivalent of SI
for DVB.
PSK Phase Shift Keying: A method of modulating digital signals
particularly suited to satellite transmission.
EN/LZT 790 0046/1 R1A A-15