Ericsson RX1290 Betriebsanweisung PDF herunterladen (Seite 82)

Glossary

Page A-4 Reference Guide: RX1290 H.264 Contribution Receiver

ST.RE.E10228.1

DCE Data Communications Equipment: Typically a modem. It establishes, maintains and

terminates a session on a network but in itself is not the source (originator) or destination (end

receiving unit) of signals (e.g. a computer, see DTE). A DCE device may also convert signals

to comply with the transmission path (network) format.

DCT Discrete Cosine Transform: A technique for expressing a waveform as a weighted sum of

cosines. Raw video data is not readily compressible. DCT is not in itself a compression

technique but is used to process the video data so that it is compressible by an encoder. DCT

processes the picture on an 8x8-pixel block basis, converting the data from an

uncompressible X Y form (as displayed by an oscilloscope) to a compressible frequency

domain form (as displayed by a spectrum analyser). Can be forward DCT or inverse DCT.

DDS Direct Digital Synthesiser.

Decoder The unit containing the electronic circuitry necessary to decode encrypted signals. Some

Decoders are separate from the receiver but in satellite TV broadcasting, the term is often

used interchangeably as a name for an Integrated Receiver Decoder (IRD). The term IRD, or

IRD / Decoder, is usually associated with satellite TV broadcasting while Cable systems are

based on Converters or on Set-Top Boxes / Converters.

Decoding Time-stamp A field that may be present in a PES packet header that indicates the time that an access unit

is to be decoded in the system target Decoder.

DENG Digital Electronic News Gathering

DID Data Identifier.

Differential Coding Method of coding using the difference between the value of a sample and a predicted value.

DIL Dual In Line: The most common type of package for small and medium scale integrated

circuit

s. The pins hang vertically from the two long sides of the rectangular package, spaced

at intervals of 0.1 inch.

DIN Deutsches Institut für Normung: German Standards Institute.

Downlink The part of the satellite communications circuit that extends from the satellite to an Earth

station.

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.

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.

DTMF Dual-Tone MultiFrequency

DVB Digital Video Broadcasting: A European project which 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-Professional Interfaces: TTV Lan search shows – DVB Physical Interfaces

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