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AC 3
Output for Dolby Digital signal
ASTRA
SES (Société Européene des Satellites) satellite
system. Analogue and digital transponders in the
frequency range 10.7-12.75 GHz.
AV programme pos.
Preferred programme slot on TV set for external
connections such as Scart and HDMI
CAM – Conditional Access Module
Decryption decoder, which uses a smart card to
decrypt the encrypted radio and TV signals.
Channel package
The channel package for a digital transponder
normally includes several TV and radio channels.
Each channel package has a fi xed assignment for the
transponder transmission frequency, for polarisation
(horizontal or vertical), for the symbol rate and for
the Viterbi rate or error rate.
CI - Common Interface
Internationally standardised interface for CA
modules
Conditional Access (CA) system
Controls
user
access
programmes which are encrypted for reasons of
copyright or for commercial reasons.
Data rate
Data bits transmitted per second. Is expressed in
kbit/s or Mbit/s. The higher the data rate the better
the quality of the transmitted signal.
Data reduction
Compression
of
video
Redundant information is discarded.
DiSEqC™
DiSEqC™
(Digital
Control) is a communication system between
a satellite receiver (master) and the peripheral
satellite components (slaves), such as LNBs,
multi-switches, rotating antenna systems.
It is a single master/multi-slave system, i.e. there
is only ever one master in the satellite system.
All activities start from the master.
120
Short technical guide
to
services
and
and
audio
signals.
Satellite
Equipment
DiSEqC™ components
If DiSEqC™ switching matrices are cascaded,
the master receiver must transmit the DiSEqC™
signal several times, so that all DiSEqC™ multi-
switches in the cascade receive their commands.
These days, DiSEqC™ components (slaves)
must be downward compatible, i.e. respond to
the analogue switching criteria from receivers that
are only equipped with H/V and 22 kHz control
signals.
A DiSEqC™ switching matrix will work with
analogue switching criteria until the DiSEqC™
command from the master is received. All analogue
switching criteria are then ignored.
Dolby Digital 5.1
Dolby Digital is a sound transmission that allows
digital surround sound to be output on a home
cinema system.
DVB - Digital Video Broadcasting
DVB-S
refers
to
the
(S = satellite, C = cable, T = terrestrial).
DVB-S2
An enhanced DVB-S signal for HDTV with better
quality.
Eb/No ratio
The Eb/No ratio is a measure of the signal to noise
ratio of a digital signal. The value is not identical
to the C/N value familiar from analogue reception
technology. At Eb/No values below 5 dB no
reception is normally possible.
EUTELSAT
European Satellite operator, based in Paris.
Many orbit positions and European customers.
Transponders
in
10.7-12.75 GHz.
FEC
FEC is the abbreviation for Forward Error
Correction. A technique for reducing the error rate
of data transmission. Additional bits are inserted
into the data stream, so that error-correction
algorithms can be used on reception. The
FEC error rate corresponds to the Viterbi rate.
HD – Ready
This is a label created by the EICTA (European
Information, Communications and Consumer
Electronics Industry Technology Association) for
equipment that is capable of reproducing HDTV.
transmission
method
the
frequency
range
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