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C H A P T E R
5 :
W I D E
Modulation
The Modulation diagram shows the modulation of the reference and the test
signal over a bark scale. The Modulation is a number without units.
Noise Loudness
The noise loudness shown here is not comparable to the Zwicker loudness
available in the basic version. Here see the "partial loudness of additive
distortions in the presence of the masking reference signal", as described in
BS.1387. For details please look at the ITU recommendation in the Annex of
this manual.
Model Output Variables and ODG
The screen shot in Figure 5.31 shows the Model Output Variables (MOVs) as
they are defined by BS.1387. For a detailed explanation refer to the ITU-R
recommendation in the Appendix of this manual. The results are shown
framewise and are averaged since the beginning of the measurement. This
diagram contains several bars, each having a different meaning, scaling and
unit. The unit - if available - as well as the current value are shown on top of the
bars. The percent scale on the left side of the diagram is for orientation merely .
The first 5 bars (RModDif .. EHS) represent the MOVs according to BS.1387.
Table 5.5 may help relating the OPERA™ names to the according names of
the ITU recommendation.
Figure 5.31: PEAQ Advanced Model Output Variables (MOVs) and the ODG
OPERA™ name
RModDif
NLA
ALD
SNMR
EHS
Table 5.5: PEAQ Model Output Variables with respect to BS.1387 definitions
B A N D
A U D I O
Q U A L I T Y
BS.1387 name
RmsModDiff
A
RmsNoiseLoudAsym
AvgLinDist
A
Segmental NMR
B
EHS
B
106
T E S T I N G
A
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