A08 - 25.09.2015
VTQ WMS HD - V/G-Mount TX
34
» HF-Performance
(„High Frequency“)
In contrast to EIRP the HF-performance does not measure the radiation power but the pure transmission
performance of a transmitter measured at the antenna output jack.
» ISM
(“Industrial, Scientific, and Medical Band”)
ISM marks frequency bands which can be used for industry, science, and medicine purposes. It is possible to
use them free of licence fees and charges.
» MER
(„Modulation Error Ratio“)
The Modulatio Error Ratio is - according to the DVB standard - a parameter for the assessment of interferences
during the transmission. All perturbations are concentrated in one measured value. The higher the MER value,
the better the signal quality.
» MPEG
(„Moving Pictures Experts Group“)
The MPEG is a experts group which standardizes video compression. MPEG-2 is a MPEG Standard regarding
video and audio data compression. Also this standard is used by DVB-T, the digital television in Germany.
» NTSC
(“National Television Systems Committee”)
NTSC is a system of the analogue colour television in the United States and in parts of Eastern Asia. It is the
pedant to the European PAL Standard.
» OFDM
(“Orthogonal Frequency Division Multiplexing”)
Instead of modulating only a single carrier several thousand carriers are modulated at the same time. Every
single carrier is phase and amplitude modulated and therefore carries the information of several bits per symbol
(typically 2 or 6 bit).
» OSD
(“On Screen Display”)
On the screen a menu of the current picture is displayed. These menus serve for operation and set up of the
devise.
A1. Glossary
Glossary