Promax HD Ranger +, Руководство пользователя

Страница: 144 / 224

December 2014
3
A1.1.2
Digital TERRESTRIAL Television SECOND Generation
(DVB-T2 standard/COFDM modulation)
The DVB-T2 demodulator version allows working with Base (standard version)
and Lite (mobile devices version) profiles.
DVB-T2 Parameters
►
Channel Bandwidth
This parameter affects the frequency separation of the carriers. Its value
is 6 MHz, 7 MHz or 8 MHz.
►
Spectral inversion
It detects if the input signal has been inverted.
►
FFT Mode
It defines the number of modulation carriers between values 1k, 2k, 4k,
8k, 8k + EXT, 16k, 16k + EXT, 32k, 32k + EXT.
►
Pilot Pattern
There are several pilot patterns available from PP1 to PP8, which offer
different features depending on the type of channel. Each pattern
supports time and frequency variations up to the Nyquist limit. Limits
depend on certain characteristics such as the receiver operation, if the
interpolation is in frequency and time or just in time, and so on.
►
Guard Interval
This parameter is the dead time between symbols; its purpose is to detect
problems due to multipath echoes. This parameter is expressed in terms
of the symbol duration: 1/4, 19/256, 1/8, 19/128, 1/16, 1/32, 1/128.
►
Constellation
COFDM modulation with constellations QPSK, 16QAM, 64QAM, 256QAM.
►
Constellation rotation
It detects if the constellation is rotated (ON) or not (OFF).
►
Code rate
It defines the ratio between the number of data bits and the total number
of bits transmitted (the difference corresponds to the number of control
bits for the detection and recovery of errors).
►
PLP id
It is the PLP identifier. In the case of PLP Single mode identifies the input
stream (0-255).In the case of PLP Multiple mode clients can choose the
PLP ID to view.