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DVB-T
81
Hierarchy
Meaning: Two carriers streams are simultaneously transmitted and the transport
stream with the higher priority is QPSK modulated.
There are four hierarchy steps (0, 1, 2 and 4).
Hierarchy = 0 menus, that the signal is not hierarchy modulated.
Hierarchy = 1 means, that the signal is hierarchically modulated.
Two transport streams are simultaneously transmitted, one has
higher priority in QPSK.
Hierarchy = 2 menus, that the signal is hierarchically modulated.
The modulation is compared to the QAM modulation is one step
securer.
Hierarchy = 4 means, that
the signal is hierarchically
modulated. the QPSK
modulation is securer that
the QAM modulation by two
steps.