User guide

Aries Reference Manual Section 2 – Viewing and Analysing Data
Radio Systems Information Ltd. Page 44
3.3 Which PESQ?
Aries provides a choice of PESQ results: either P.862 (known as PESQ) or P.862.1 (known as PESQ
MOS-LQO).
P.862 (PESQ) provides results on a MOS-like scale ranging from -0.5 to 4.5.
P.862.1 (PESQ MOS-LQO) provides a better match to the true Mean Opinion Score scale of 0 to 5.
The basic analysis is the same for both results, with the results simply mapped to the MOS scale in a
different way.