PEXQ - perceptual quality by OPTICOM: all-in-one testing suite

Opticom

PEXQ is OPTICOM’s latest product for Windows offering a complete portfolio of quality measurement tools for voice, audio/visual and data payload analysis based on human perception. PEXQ provides mandatory features in the area of R&D for the development of new multimedia codecs as well as for multimedia equipment manufacturers. Besides lab testing PEXQ is also ideal for network operators and carriers to measure quality of service. PEXQ is founded on well established internationally standardized measurement algorithms such as PESQ (ITU-T Rec. P.862, P.862.1 (narrow band), P.862.2 (wide band); Perceptual Evaluation of Speech Quality) and completely new metrics for video quality testing like PEVQ (Perceptual Evaluation of Video Quality).

> New in PEXQ:

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Composite result view for Audio-Visual Quality testing reporting Audio and Video MOS KPIs (upper diagram) and detailed lip-sync analysis window (lower diagram)

> The PEXQ feature overview:

•	Employment of the latest standards for perceptual quality testing: The current version offers measurement algorithms for voice signals (P.862.x, ECHO and PESQ-TQ) and for video signals (PEVQ). Measurement algorithms for data i.e. web-browsing (PEDQ) and for audio signals (PEAQ) will be available very soon, too.
•	Audio-Visual quality testing: Combined evaluation of audio and video information to form an overall multimedia quality estimate as well as metrics for lip-synchronicity and many more.
•	Conversational quality testing: Providing the complete quality picture of a real life telephony situation considering the aspects of listening and talking quality such as echoes.
•	Easy to use and comprehensive Graphical User Interface: Only a few clicks are needed to run a measurement. Charts and diagrams help you to interpret your results quickly.
•	Extended Video Quality Analysis Support: Watch your video sequences with additional diagnostic information such as frame differences of degraded and original sequence after a temporal and color alignment.
•	Automatic measurement algorithm selection: Let your PEXQ suite do the work and have it configure your measurement setup automatically.
•	Export/Import your measurement configuration settings: Once you have configured your setup you can save your settings to a configuration file (XML) and repeat your measurement with the exact same settings without the need to reconfigure PEXQ again.
•	Export/Import your measurement results: Archive your measurements to an XML-file and if you want to reanalyze your data again simply import your results again to PEXQ.
•	Reporting functionality: Copy your measurement results to your documents via the MS Clipboard.
•	Scalability and Flexibility: The new PEXQ suite is available as a stand-alone software solution for lab testing under MS Windows as well as for OEM licensing for T&M manufacturers and system integrators.
•	Command Line Functionality: Evaluate hundreds of test files in batch mode by using PEXQ’s command line functionality.

> Future versions of PEXQ will also include:

•	Enhanced data acquisition features: Acquire data streams, run the measurements and analyze the results all in one single tool!
•	Inclusion of audio quality and data quality metrics: PEXQ will provide you with a complete multimedia measurement solution.
•	Extended audio/voice analyzing support: For example you will be able to listen to your wav-files.

> Possible Application and Configuration Scenarios:

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The table above provides you with an overview of the currently employed and future features of PEXQ.

> The following PEXQ product versions are available:

PEXQ Suite for Windows
•	Graphical User Interface Single-User License
•	Graphical User Interface Multi-User License
PEXQ Developer’s Edition for Windows
•	Graphical User Interface including OPTICOM’s Advanced OEM Developer Toolkit* for developers of T&M equipment and system integrators

*The OPTICOM Advanced OEM Developer Toolkit is a set of software libraries containing measurement and signal preprocessing algorithms. OPTICOM’s OEM software libraries are available for Windows and Linux.

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PESQ Analysis of Listening Quality (upper diagram) with Spectrogram
of test signal (lower diagram). Note the easy configurable tab selection for multifaceted result views.

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Comprehensive analysis of Talking Quality: Echo Return Loss analysis and PESQ-TQ MOS (upper diagram), Echo Delay Histogram (lower diagram)

> Download more detailed information

->	Download Opticom Newsletter Feb 2007 [as PDF / 968 kb]

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