Perceptual Objective Listening Quality Assessment - is the latest generation of algorithm designed to predict MOS of speech signals. POLQA® has been standardised by the ITU as Recommendation P.863 following a four year contest, and has been rigorously tested by industry experts using many thousands of test cases. It can be used to assess modern codecs catering for narrowband, wideband and super-wideband speech dealing with the characteristics of modern codecs, wider frequencies and digitally encoded voice. Since 2011, POLQA is being adopted around the world as a successor to existing algorithms including PESQ, providing more reliable measurements, particularly in these areas:
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P.862 and PESQ Output |
Reference Surface Degraded Surface Error Surface |
PESQ and POLQA both quantify received voice quality using the ITU Mean Opinion Score (MOS) scale. This runs from 1 (the lowest voice quality) to 5 (the highest).
MOS scale |
Listening Quality
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5.0* |
Excellent |
4.0 |
Good |
3.0 |
Fair |
2.0 |
Poor |
1.0 |
Bad |
* The MOS scale varies depending on which version of algorithm is applied e.g. PESQ and POLQA wideband run from 0 (min) to 4.5 (max) while POLQA super wideband runs from 0 (min) to 4.75 (max)
PESQ has successfully evaluated voice quality for fixed and wireless networks for over a decade. However, rapid advances in speech coding techniques and noise reduction technology over the last ten years have posed certain challenges for PESQ and enabled POLQA to develop as a natural successor in speech quality testing.
Syntech offer a range of PESQ/POLQA testing services and consultancy. We can test multiple scenarios across a number of different circuit types and termination points. At the end of testing we will analyse and collate your results into a detailed report.
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Click here to read our Case Study of PESQ Testing for Northern Ireland Fire & Rescue Service.
To discuss your Speech Verification requirements in greater detail please contact us on 01483 443800 or email
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