Ericsson SPR1100 Operations Instructions download pdf (Page 244)

Glossary

PES Packetized Elementary Stream: A sequential stream of data bytes

that has been converted from original elementary streams of audio

and video access units and transported as packets. Each PES

packet consists of a header and a payload of variable length and

subject to a maximum of 64 kbytes. A time stamp is provided by the

MPEG-2 systems layer to ensure correct synchronization between

related elementary streams at the Decoder.

PID Packet Identifier: the header on a packet in an elementary data

stream, which identifies that data stream. An MPEG-2 / DVB

standard.

PIN Personal Identification Number: A password used to control access

to programming and to set purchase limits. Each subscriber

household can activate several PINs and may use them to set

individual parental rating or spending limits for each family member.

Pixel PIX (picture) Element: The digital representation of the smallest

area of a television picture capable of being delineated by the

bit-stream. See Pel for more information.

pk-pk peak to peak: Measurement of a signal or waveform from its most

negative point to its most positive point.

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.

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.

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Ericsson SPR1100 Operations Instructions Page 244

Comments to this Manuals

Ericsson SPR1100 Operations Instructions Page 244

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