39
8 Technical Terms
Antenna cable:
Cable connection between the modulator of the satellite receiver and the antenna input of
the TV set, used as an alternative where no SCART connection is provided.
AV: see SCART
Coaxial cable:
Cable connection between the LNB and the satellite receiver, transmits the signals received
and transmits power supply to the LNBs.
Data compression/MPEG1/MPEG2:
The transmission of an image in accordance with current TV standards (625 lines with a pic-
ture frequency of 50 Hz) results in a digital data volume of 216 Mbit/s. This would require
bandwidths not available in terrestrial or satellite systems. The data volume is thus subjected
to a process of data reduction. MPEG2, which is an expanded development of MPEG1, has
been set in Europe as the worldwide standard for data compression.
Deemphasis:
Making the audio frequency curve conform to the broadcast signal, this is determined by the
transmission parameters of the satellite.
DiSEqC:
Digital Satellite Equipment Control - a digital control signal used to control DiSEqC-compa-
tible components of the external unit via the antenna connection.
DVB:
Digital Video Broadcasting - a universal digital transmission technology for video images,
graphics, sound and text, i.e. for data in any conceivable form and in every possible and
appropriate quality.
External unit:
Description for the entire system mounted outdoors, consisting of the parabolic dish antenna
as well as one or more LNBs, to receive signals from one or more satellites.
Frequency:
Physical unit for measuring the number of oscillations per second, expressed in Hertz (Hz) or
cycles per second.
Frequency range
a) Satellite or LNB
11 GHz range from 10.70 GHz to 11.70 GHz, 12 GHz range from 11.70 to 12.75 GHz
b) Receiver - Intermediate Frequency or 1st Intermediate Frequency 950 to 2150 MHz
Unit of frequency
Name
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
Intermediate Frequency:
The frequency range broadcast by satellite cannot be transported by cable, the LNB therefo-
re transforms the incoming signal to the intermediate frequency range of 950 to 2050 MHz,
thus allowing the signal to be transmitted to and modulated in the receiver.
1.IF = Intermediate Frequency
IRDETO
Form of digital encryption (scrambling)
bed_anl_DigiBox Irdeto_englisch.qxd 30.01.02 12:03 Seite 39
