– 7871 - 7872 - 7875 - 7876 –
p.
56
11.8 DVB-T/H
Display of the measures of:
BERi
:
error rate before Viterbi
BERo
:
error rate after Viterbi
PER
:
error rate after Reed Solomon (error rate packet)
MER
:
modulation error rate
LKM
:
noise margin (Link Margin)
BERx
: ‘bits’ error rate
Ratio between the number of false bits / number of transmitted bits during the measurement time
PER
: ‘paquets’ error rate
Ratio between the number of false packets / number of transmitted packets during the measurement time
Recall: Under DVB-T/H, a packet is made of 204 octets; a packet is "false" if it includes more than 8 wrong
octets (correction by Reed Solomon coding).
Display of the type of
Modulation
detected:
number of carriers (8 K)
constellation (64QAM)
guard interval (1/32 auto)
Viterbi rate (2/3)
spectrum inversion
In case of poor signal quality or co-frequent analogical signal, it is wise to switch to the manual guard interval
mode. To do so, you have to select the « Modulation » line and set the guard interval parameter to the right
value.
Display of the value of Cell ID from the diffuser and specific to the emitter.
TUNER
DEMODULATOR
VITERBI
REED
SOLOMON
DECODAGE
MPEG
PER
BERi
BERo
