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TUNER
A/D
Figure 33.- DVB-T/H
BER
The
measurement is provided in scientific notation (i.e. 1.0 E-7 means
1.0x10
-7
, that is to say 1.0 average value of wrong bits of each 10000000) and through a
graphic bar (as its length is smaller the signal quality will be better). The analogue
representation is done on a logarithmic scale (not linear), that is to say, the bar divisions
correspond to the exponent of the measurement.
With the aim to have a reference about the signal quality, it is considered that a
system has a good quality when it decodes less than one non-correctable error for every
transmission hour. This border is known as
BER
approximately to a
of each 10000). This value is marked on the measurement bar of the
BER
for acceptable signals must be at the
Finally it is shown a status line with information about the detected signal. The
possible messages that can appear and its meaning are showing the following list. The
messages are exposed from less to more fulfilment of the
No signal received
No signal has been detected.
Timing recovered
Only it is possible to recuperate the symbol time.
Page 58
USER'S MANUAL.
BER before FEC,
MER
COFDM
DEMOD.
Figure 32.- COFDM
reception system.
COFDM
(
) signals
QEF
2.0E-4 BER
after Viterbi of
left
side of this mark.
TV EXPLORER HD / HD
BER after Viterbi
VITERBI
RED-SOLOMON
VBER
measurement screen
Quasi-Error-Free
(
) and it corresponds
(2.0x10
-4
, that is to say 2 wrong bits
BER
MPEG-2
standard:
LE
.
and therefore,
10/2012
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