Understand how POLQA time aligns signals before analysing surface views. POLQA and PESQ align reference and degraded signals in time using rather different philosophies. Read more before you start analysing results in detail. If you’ve been using PESQ for years, you may be confused.
Expect reporting of small delay variations which are not actually there. POLQA has a sophisticated time-alignment algorithm to account for both step-delay changes and time-warping. Read this article to avoid being confused when POLQA reports small delay variations on a perfect network.
Ensure POLQA reference files pass the transparency test. Here we explain the hows and the whys of checking that your reference speech material is appropriate for POLQA testing. Read this article to avoid running hours of worthless testing because your reference speech files were not good enough.
Don’t use more than 10s of speech in narrowband mode. For long recordings of, say, 32 seconds POLQA can show a drop in score of around 1.1 compared to the average of four 8s measurements.
Many devices, including cellphones, now have mp3 players or similar music replay capabilities. Assessing the quality of the replay is important in product development, production and a factor in cellphone selection. Here’s how to do it with MultiDSLA.
LinkedIn Twitter Facebook Google+ Weibo VKontakte Viadeo Flipboard SkypeMultiDSLA is well known for its speech-based measurements but it also supports the tone-based and other measurements used traditionally to assess telephony performance. These features are contained in the Telephone Tester option and can now be used with a 48k sample rate DSLAII to measure the performance of music playback. LinkedIn Twitter …
In this how-to we explain how adjusting the level at which we run the test significantly influences the measured speech quality of the connection.
A recent request we received to monitor a call and terminate it if, at any time, a tone is detected on the call.
MultiDSLA includes a programmable interface to control the configuring and scheduling of tests along with the extraction of results. This tutorial demonstrates how simple it is to get started.
This release adds a new File Processing option, improves debugging experience of call setup issues, provides improvements to node configuration management, allows opening and analysis of sound files, adds a new 3GPP2 acoustic test along with numerous other enhancements and bug fixes.