A measure of the relative position of a signal relative to a reference expressed in degrees.
A distortion of the phase component of a signal. This occurs when the phase shift of an amplifier is not proportional to frequency over the design bandwidth.
The number of picture elements resolved on a television picture screen. More crisp pictures result as the number of picture elements is increased.
A dish mount that permits all satellites in the geosynchronous arc to be scanned with the movement of only one axis.
A characteristic of the electromagnetic wave. Four senses of polarisation, determined by the direction of the electric field, are used in satellite transmissions: horizontal; vertical; right-hand circular; and left-hand circular.
Positive Picture Phase:
Positioning of the composite video signal so that the maximum point of the sync pulses is at zero voltage. The brightest illumination is caused by the most positive voltages.
The PPUA or Program Provider User Address is a 4-byte long code, composed of 2 separate codes. The first 3 bytes of the PPUA is called the Shared Address, the last byte of the PPUA is the Customer Word Pointer. The PPUA is used to identify and address cards.
The first amplification stage. In a terrestrial receive system, it is the amplifier mounted adjacent to an antenna to increase a weak signal prior to its processing at the headend
Increases in the higher frequency components of an FM signal before transmission. Used in conjunction with the proper amount of de-emphasis at the receiver, it results in combating the higher noise detected in FM transmissions.
Making subscription products available on the decoding device before releasing into the marketplace
Presentation Time Stamp (PTS):
A 33-bit field indicating when the packetised elementary stream (PES) packet should be presented to the user (90 kHz base reference)
Prime Focus Dish:
A parabolic dish having the feed/LNA assembly at the focal point directly in the front of the dish.
Provider Group & Provider ID:
A 3-byte hexadecimal number to identify a card. The first 2 bytes identify the Provider Group, the 3rd byte is the Provider ID and is either 00 or 10. So only 2 different ID’s are used. Most providers are addressed using Provider ID 00. One exception is German Provider Premiere World who uses Provider ID 10.
Program Clock Reference (PCR):
A counter based on a 27 MHz time-base used to synchronize the presentation of data arriving in different data streams on the multiplex (asynchronously). The PCR is split into two sections when supplied – 33 bits giving 1/90 kHz resolution and a 9-bit extension to fine-tune to 27 MHz
Program Map Table (PMT):
A table that identifies the data streams that comprise a service and provides other data used for decoding these services
Program Specific Information (PSI):
Information provided in a format defined by MPEG to convey the essential data a decoder must have to receive one or more services make up of elementary streams. It consists primarily of the program association table (PAT), program map table (PMT) and conditional access table (CAT), although it also introduces the network information
Programme Stream (PS):
An MPEG 2 multiplex with variable length packets that are typically large – intended for low error rate transport media with only a single programme, for example, CD-ROM ion table (NIT)
– Personal video player. Portable device designed to play back video files from a hard drive; may or may not include a small LCD screen.
– Personal video recorder. See DVR.
Quadrature Phase Shift Keying (QPSK):
A modulation technique used on satellite transmissions that uses phase shifts of a carrier wave to relay 4 symbols per cycle