Download User Manual

C O N T E N T S
4
Getting to Know the OPERA™ Framework.............................29
4.1
General Concept ............................................................................................. 29
4.2
Data Acquisition Using OptiCall™.................................................................... 30
4.2.1
4.2.2
4.2.3
4.3
4.3.1
4.3.2
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.4.6
4.4.7
4.4.8
4.4.9
4.4.10
4.4.11
4.5
4.5.1
4.5.2
4.5.3
5
POTS Telephony Interfaces..................................................................................30
Audio Interfaces ....................................................................................................33
The OptiCall™ Program........................................................................................40
The OPERA™ Framework .............................................................................. 54
The Underlying Generic Algorithm Model .............................................................54
The Structure of the OPERA™ Framework ..........................................................55
Basic Operation ............................................................................................... 57
The Main Window .................................................................................................57
How to Select a Measurement Algorithm .............................................................58
How to Start a Measurement ................................................................................60
How to Display the Results ...................................................................................68
Setting Markers in Diagrams.................................................................................73
Logging Results ....................................................................................................74
Performing Online Measurements in Realtime .....................................................74
Measuring only parts of the Input Files .................................................................75
Printing ..................................................................................................................76
Exporting Graphs ..................................................................................................76
Summary of the Menu Options .............................................................................77
Performing Measurements From Batch Files................................................... 81
Syntax of the Command Line Parameters in a Batch File ....................................81
How to Use a Configuration File ...........................................................................82
Example RunPsqm.bat .........................................................................................83
Wide Band Audio Quality Testing............................................85
5.1
What To Know About Testing Wide Band Audio Quality .................................. 85
5.2
Reference Files for Wideband Audio Measurements ....................................... 86
5.3
Signal Acquisition ............................................................................................ 86
5.4
Fundamentals of the PEAQ Measurement Algorithm....................................... 87
5.4.1
5.4.2
5.4.3
5.4.4
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.6
5.6.1
5.6.2
5.6.3
5.6.4
Background of the PEAQ (ITU-R BS.1387) Development ...................................87
Common Elements of PEAQ Basic and PEAQ Advanced ...................................87
Basic version.........................................................................................................88
Advanced Version .................................................................................................89
Using PEAQ .................................................................................................... 90
OPERA Software Suite - PEAQ............................................................................91
OPERA Portable Tester with Audio Interface Option ...........................................91
Algorithm Parameters ...........................................................................................91
Diagram Types, PEAQ Basic................................................................................92
Diagram Types, PEAQ Advanced.......................................................................105
Command Line Arguments .................................................................................107
Example Measurement Setups...................................................................... 107
Example 1: Online Monitoring.............................................................................108
Example 2: Stand Alone Testing.........................................................................111
Example 3: Measurements From a Batch File....................................................113
More Examples ... ...............................................................................................116
iv