OPTICOM OPERA Broadcast, User Manual

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C H A P T E R 5 : W I D E B A N D A U D I O Q U A L I T Y T E S T I N G
107
Objective Difference Grade (ODG) and DI
The last two bars in the diagram shown in
Figure 5.31
are the Distortion
Index (DI) and the final Objective Difference Grade (ODG). The "AV" in the
brackets indicates that this value is a result of the Advanced Version of the
PEAQ algorithm.
Note:
Never compare the ODG value of one measurement with the DI
value of another.
5.5.6 Command Line Arguments
The current PEAQ implementation provides several algorithm specific
command line parameters to:
•
Set the version of the algorithm (basic, advanced)
•
Set the listening level
•
Set the logging of the results
These parameters essentially follow the settings of the algorithm parameter
dialog and are listed with a short comment on their usage in the following:
Keyword Add. Parameter Comment
Version 0 = Basic; 1 = Advanced Select the Version of the Algorithm
Level Listening Level of a 1kHz
0dBfs sine tone Set the listening level according to
BS.1387
LogActive Switch logging on
LogODG float Logging if ODG <= float
LogInterval duration Logging intervals in s
LogFileName FileName Name of the logfile
5.6 Example Measurement Setups
To an inexperienced user of the OPERA™ measurement system, the following
examples might be useful to assist in the first measurements. The first example
demonstrates a typical real time measurement, Example 2 deals with a file
based measurement and finally you will get to know a typical application of
measurements from a batch file with Example 3.