Glossary
Reference Guide: EN8000 MPEG-4 Part 10 (H.264/AVC) Encoders
Page A-5
ST.RE.E10233.1
Downconvert
The process by which the frequency of a broadcast transport stream is shifted to a lower
frequency range.
DPCM
Differential Pulse Code Modulation: An audio digitisation technique that codes the
difference between samples rather than coding an absolute measurement at each sample
point.
DRM Digital
Rights
Management where the rights to view or copy the material is defined and
enforced. This is similar to Controlled Access (CA) but in general, no smartcards are used
DSNG
Digital Satellite News-Gathering.
DSP Digital
Signal
Processor.
DTE
Data circuit Terminating Equipment: A communications device that originates (is the
source) or is the end receiving unit (destination) of signals on a network. It is typically a
terminal or computer.
DTH
Direct To Home. The term used to describe uninterrupted transmission from the satellite
directly to the subscriber, that is, no intermediary cable or terrestrial network utilised.
DTS
Digital Theater Systems: A motion picture digital sound system.
DVB
Digital Video Broadcasting: A European project that has defined transmission standards for
digital broadcasting systems using satellite (DVB-S), cable (DVB-C) and terrestrial (DVB-T)
medium, created by the EP-DVB group and approved by the ITU. Specifies modulation, error
correction, etc. (see EN 300 421 for satellite, EN 300 429 for cable and EN 300 744 for
terrestrial).
DVB SI
Digital Video Broadcasting Service Information.
DVB-PI DVB-Physical
Interfaces
Earth Technical
Earth: Ensures that all equipment chassis within a rack are at the same potential,
usually by connecting a wire between the Technical earth terminal and a suitable point on the
rack. This is sometimes known as a Functional earth.
Protective Earth: Used for electric shock protection. This is sometimes known as a safety
earth.
EBDU
Encapsulated Bitstream Data Unit is a section of VC-1 bitstream that is self-contained and
has been encapsulated with a start code.
EBU
European Broadcast Union.
ECM
Entitlement Control Message.
EDI
Ethernet Data Input
EIA
Electronics Industries Association (USA).
EIDU Encapsulated
IDU that is an IDU with a start code and, in some cases, an end code to define
the IDU within a continuous bitstream.
EIT
Event Information Table: Equipment: A component of the DVB-Service Information (SI)
stream generated within an Encoder, containing information about events or programmes
such as event name, start time, duration, etc.
System: EIT (Present/Following) contains the name of the current and next event. It may
include an optional descriptor (synopsis) giving brief details of content. EIT (Schedule) is used
to produce a full EPG. The EIT is the only DVB-SI table, which can be encrypted.
Elementary Stream
A generic term for a coded bit-stream, be it video, audio or other.
EMC Electromagnetic
Compatibility.
EMM
Entitlement Management Message.
Encryption
Encoding of a transmission to prevent access without the appropriate decryption equipment
and authorisation.