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I haven't attempted to include lengthy explanations here. Although you may not be enlightened by the expansion of an abbreviation, you will be able to search for the phrase to determine the full technical explanation.
16:9 - The aspect ratio used for widescreen television
4:3 - The aspect ratio used for conventional television
AAL - ATM Adaptation Layer
AD - Audio Description
AES - Audio Engineering Society
AFD - Active Format Descriptor
Analogue Text - a term used on the Digital Spy forums to refer to the text systems broadcast on ATT
API - Application Programming Interface
ARC - Aspect Ratio Converter
ASI - Asynchronous Serial Interface
ATM - Asynchronous Transfer Mode
ATT - Analogue Terrestrial Television
AU - Access Unit
BAT - Bouquet Association Table
BBCi - The BBC's digital text system
BER - Bit Error Ratio. A measure of the quality of the signal. (Lower the better.)
Box - see Digibox
bslbf - "bit string, left bit first"
BskyB - see "Sky"
CA - Conditional Access
CAM - Conditional Access Module
CAT - Conditional Access Table
cbr - constant bit rate
Coax - Coaxial cable, having a central wire core enclosed in a plastic insulating 'dielectric' tube and surrounded by a woven metal wire and/or foil shield layer with an outer protective sheath.
CI - Common Interface
CRC - Cyclic Redundancy Check
CRT - Cathode Ray Tube
DAB - Digital Audio Broadcasting
Digibox - any digital TV receiver but UK usage normally restricted to a receiver for receiving Sky broadcasts. Further abbreviated to "box" with appropriate qualification such as "Sky box", "Freesat box", "FTA box" or "Freeview box" or preceeded by a manufacturer's name such as "Amstrad box".
DOG - on-screen channel logo (Digitally Overlayed Graphic)
DRM - 1. Digital Radio Mondial 2. Digital Rights Management
DTG - Digital Television Group
DTR - Digital Terrestrial receiver ("Freeview" in the UK)
DTS - Decoding Time Stamp
DTT - Digital Terrestrial Television
DVB - Digital Video Broadcasting
DVD - Digital Versatile Disc (sometimes Digital Video Disc)
DVI - Digital Video Interface
DVR - Digital Video Recorder
DX - long distance reception
EBU - European Broadcasting Union
ECM - Entitlement Control Messaging (not Electronic Countermeasure!)
EIT - Event Information Table
EMM - Entitlement Management Message
EPG - Electronic Programme Guide
ERP - Effective Radiated Power (of a transmitter)
ETR - European Telecommunication Report
ETS - European Telecommunication Standard
ETSI - European Telecommunications Standards Institute
fec - forward error correction
Freeview 1. The entire UK DTT system (colloquial meaning) 2. The free channels on the UK DTT system (precise/pedantic meaning)
FTA - Free To Air. Programmes which are broadcast unencrypted and can be viewed on any suitable receiver without subscription charges.
FTV - Free To View. Programmes which are encrypted but can be decoded by use of a specific receiver (and sometimes a viewing card) which can be bought for a one-off payment (no subscription charges). The purpose of FTV is to restrict viewing to a specific geographical area - usually to comply with licensing conditions.
GOP - Group of Pictures
GPS - Global Positioning Satellite
HD - High Definition
HDMI - High-Definition Multimedia Interface
HOS - Heap of shit. Some equipment richly deserves this description
IEC - International Electrotechnical Commission
IDTV - Integrated Digital television
IPTV - Internet Protocol Television
IRD - Integrated Receiver Decoder
IRN - Independent Radio News
ISDN - Integrated Services Digital Network
ISO - International Organisation for Standardisation
LCD - Liquid Crystal Display
LCN - Logical Channel Number
LNB - Low Noise Block-downconverter (with amplifier). Its purpose is to convert a block of high frequencies ('microwave') to a block of lower frequencies which can be passed down a coaxial cable. Normally uses low-noise HEMTs (High Electron Mobility Transistors). LNB is often (wrongly) interpreted as "Low Noise Block" or "Low Noise Blocker".
LNC - Low Noise Converter (basically an LNB without an amplifier. Not used for domestic products).
lsb - least significant bit
LVDS - Low-Voltage Differential Standard
LX - local reception
MJD - Modified Julian Date
MFN - Multi Frequency Network
MHEG - the system used in the UK for digital text (Multimedia and Hypermedia Experts Group)
MOD - see RFMOD
MPEG - Moving Pictures Expert Group
msb - most significant bit
MSTS - Multi-Service Transport Stream
Multiplex - a bundle of digital channels broadcast as a single entity
MUX - Multiplex
NDA - Non-Disclosure Agreement
NICAM - Near Instantaneous Companded Audio Multiplex. A method for broadcasting stereo audio.
NIT - Network Information Table
NVOD - Near Video On Demand
OAD - On-Air Download
OFDM - Orthogonal Frequency Division Multiplexing
OP - fourm-speak for "original poster"
osd - on-screen display
PAL - Phase Alternating Line. A method used for building a TV picture from transmitted 'lines' of information.
PAT - Program Association Table
PCR - Programme Clock Reference
PDC - Programme Delivery Control
PDH - Plesiochronous Digital Hierachy
PES - Packetised Elementary Stream
PFL - Pre-fade Listen. Facility on a mixing desk that allows the operator to listen to a piece of audio and set levels before putting the audio to air. Also referred to as 'cue'
Phono - A type of connection used for audio (RCA).
PID - Packet IDentifier
PMT - Program Map Table
Polarisation - the orientation of the electric vector of a radio wave with respect to the propagation direction.
Polarity - electrical polarity defines the direction in which electrons flow in a conductive medium. Electrons have a negative charge and always flow towards the positive pole of a circuit. The word is also used to refer to the direction of flux in a magnetic field. Some components are marked with their desired polarity to ensure that they are connected the right way round.
PPL - Phonographic Performance Ltd. Body that collects royalties in respect of music played by radio stations on behalf of record companies.
PPM - Peak Program Meter. Meters on a mixing desk that monitor audio levels
PPV - Pay Per View
prbs - pseudo-random binary sequence
PRS - Performing Right Society. Body that collects royalties in respect of music played by radio stations for artists and composers.
PSB - Public Service Broadcaster
PSI - Program Specific Information
PSTN - Public Switched Telephone Network
PSU - Power Supply Unit
PTS - Presentation Time Stamp
PVR - Personal Video Recorder
RCA - A type of connection used for audio (Phono).
Reboot - The act of switching the power off and on
RGB - 'Red, Green, Blue' - the primary colours used to make up a TV picture. It's commonly used when referring to outputs from a set-top box into a TV.
QAM - Quadrature Amplitude Modulation
QOS - Quality Of Service
QPSK - Quaternary Phase Shift Keying
RF - Radio Frequency. Often used to refer to connections carrying TV signals in the UHF band.
RFMOD - RF modulator. A unit which superimposes video and audio signals onto a Radio Frequency carrier signal.
rpchof - "remainder polynomial coefficients, highest order first"
RS - Reed-Solomon
RST - Running Status Table
SCART - The standard method of connecting SD television equipment (Syndicat des Constructeurs d'Appareils Radiorécepteurs et Téléviseurs)
SD - Standard Definition
SDH - Synchronous Digital Hierachy
SDI - Serial Digital Interface
SDT - Service Description Table
SDV - Serial Digital Video
SECAM - A system similar to PAL (used mostly for French analogue TV transmissions).
SFN - Single Frequency Network
SI - Service Information
Sky and BskyB - British Sky Broadcasting (company)
SLA - Service Level Agreement
SMS - Subscriber Management System
SNR or S/R - Signal to Noise ratio
SSD - Solid State Drive
SSI - Synchronous Serial Interface
SSTS - Single Service Transport Stream
ST - Stuffing Table
STB - Set-top Box - a generic term referring to a satellite TV, terrestrial TV or cable TV receiver. Note that "set top" is a bad concept: equipment stacked on top of a TV set is prone to overheating and to picking up interference from the TV set. Electronic equipment should never be stacked, or installed in an enclosed space without good ventilation.
TDT - Time and Date Table
TLA - Three Letter Acronym
TOT - Time Offset Table
TS - Transport Stream
TTX - Teletext
TUTV - Top-Up TV
TV - Television
UHF - Ultra High Frequency (wavebands)
uimsbf - unsigned integer most significant bit first
UHF - Ultra High Frequency (frequency band used mostly for TV transmissions)
UNI - User-Network Interface
UTC - "Universal Time, Co-ordinated"
vbi - vertical blanking interval
vbr - variable bit rate
VCI - Virtual Channel Identifier
VCR - Video Cassette Recorder. Now being phased out and replaced by DVD recorders and PVRs
VHF - Very High Frequency (frequency band used mostly for radio transmissions)
VO - Voice-over. Typically a TV or Radio presenter or actor reading a script.
VoD - Video On Demand
VPI - Virtual Path Identifier
WSS - Wide Screen Signalling (when on line 23) or Wide Screen Switching (as seen by the viewer).