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SHORT TECHNICAL GUIDE
AC 3
Output for Dolby Digital signal
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.
CI - Common Interface
Internationally standardised interface for CA
modules
Conditional Access (CA) system
Controls user access to services and 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 and audio signals.
Redundant information is discarded.
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-C refers to the transmission method
(C = cable, S = satellite, T = terrestrial)
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.
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.
HDMI - High Defi nition Multimedia Interface
Digital interface for digital video and audio data
transmission (preferred for HDTV).
MPEG-2
MPEG is the abbreviation for Moving Picture
Experts Group, a working group that formulates
internationally applicable standards for the
digital compression of video and audio.
MPEG-2 has become established as the
standard for compression of digital TV signals.
MPEG-2 works up to a data rate of 100 Mbit/s.
MPEG-4
A further development of MPEG-2 with even
higher data compression, intended for HDTV
transmissions.
OSD - On-Screen Display
Displays by the receiver on the TV screen
(e.g. main menu)
PAL
Analogue TV standard
Pay TV
Television channels available on subscription (e.g.
Sky). Encrypted transmitters which can only be
decrypted by using the appropriate smart card.
As a rule these services are subscription-only.
PCMCIA
Standard for internal decoder interface for pay-TV
PIN
Personal Identifi cation Number. For this unit the
PIN is a 4-digit numeric code which must be
entered to unlock the unit to allow access to certain
functions and channels.
QAM - Quadrature-Amplitude-Modulation
Digital modulation process with phase shift
keying, which is used for transmissions in cable
networks.
Receivers
Receiver
RGB
Video signal made up of three individual colour
signals (red, green, blue)