Dolby Laboratories Digital-Satellite-Receiver - Manual (Page 59)

10 Technical Terms
Antenna cable:
Cable used to connect the modulator of the satellite receiver
to the antenna input socket of the television set. Used as an
alternative where no SCART socket is available
External installation:
Term used to describe those components of the total system
located outdoors, consisting of the parabolic or offset dish
antenna, as well as one or several LNCs, used to receive sig-
nals from one or more satellites
AV: see SCART
Data compression/MPEG1/MPEG2:
The transmission of the current television standard (625
lines, and a picture frequency of 50 Hz) results in a digital
data volume of 216 MBit/s.
This would require enormous bandwidths which are simply
not available, neither via satellite nor via terrestrial reception.
Therefore the data is compressed in order to achieve a
reduction in the data volume. For Europe,MPEG-2 has been
laid down as the world-wide standard for data compression.
MPEG2 is an expanded version of MPEG1
Deemphasis:
Adaptation of the audio frequency band to the broadcast sig-
nal, this is determined by the broadcast parameters of the
satellite
DiSEqC:
Digital Satellite Equipment Control: a digital control/switching
signal used to control DiSEqC-compatible components of the
external installation via the antenna cable. An example of an
installation utilizing DiSEqC components can be seen in
(Fig.
10-1) .
DVB:
Digital Video Broadcasting: A digital universal broadcast tech-
nology used to transmit pictures, graphics, sound and text,
i.e. data in any imaginable form, in appropriate quality.
Frequency:
A physical term, indicates the number of vibrations per
second, expressed in terms of the unit Hertz (Hz)
Frequency range:
a) Satellite respectively LNC:
11 GHz range from 10,70 GHz - 11,70 GHz, 12 GHz range
from 11,70 GHz - 12,75 GHz
b) Receiver: Intermediate frequency or 1.IF 950 to 2150 MHz
Unit
Description Oscillations per second
1 Hz 1 Hertz 1
1 kHz 1 Kilohertz 1.000
1 MHz 1 Megahertz 1.000.000
1 GHz 1 Gigahertz 1.000.000.000
59
A B
Position
Ausgang
A B
Position
Ausgang
A B
Option
Ausgang
Example:
(Fig. 10-1)
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