A08 - 25.09.2015
VTQ WMS HD - V/G-Mount TX
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» PAL
(“Phase Alternating Line”)
PAL marks an analogue colour television norm. PAL was developed by Walter Bruch in Germany who applied
for patent in 1963. Main objective of this norm was to reduce the colour line error. The principal concepts of
signal transmission were taken from the NTSC-system.
» QAM
(“Quadrature Amplitude Modulation”)
QAM is a coding method which combines the digital amplitude modulation and the digital phase modulation.
The objective is a constellation of signal points which represent a definite combination of bits.
» QPSK
(“Quadrature Phase Shift Keying”)
QPSK is a digital modulation method. With this method it is possible to transmit 2 bits per symbol. Thus the
exploitation of the available band width can be doubled.
» SDI
(“Serial Digital Interface”)
The SDI Standard describes the transmission of a digital serial video stream. The video data is transmitted
uncompressed with bit rates from 143 Mbit/s (NTSC composite) to 360 Mbit/s (16x9 4:2:2 component). The
digitalized audio data can be transmitted in the horizontal blanking interval. Also the HDTV transmission can be
standardized by SDI which is called HD-SDI. Here the data rate is 1,485 Gbit/s.
» SMA
Sub-Miniature Version A”)
SMA marks a high frequency plug connector for antennas. Appropriate antennas with this connection can be
connected to the system.
» VBR
(“Variable Bit Rate”)
With this compression method video and audio data are transmitted by a variable bit rate. The memory volume
of the therefore used material is compressed in regard of the signal complexity. Per time unit an appropriate
data amount is produced depending of the signal complexity. The opposite of this method is the constant bit
rate (CBR).
A1. Glossary
Glossary