Voice-Quality Altitude Comparison
Early affection altitude methods, such as MOS and PSQM, were advised before
widespread accepting of VoIP technology. PESQ was advised to abode the shortcomings
of MOS and PSQM.
MOS uses abstract testing in which the boilerplate assessment of a accumulation of analysis users is calculated
to actualize the MOS score. This adjustment is both time-consuming and expensive
and ability not accommodate constant after-effects amid groups of testers.
PSQM and PESQ use cold testing in which an aboriginal advertence book beatific into the
system is compared with the broken arresting that came out. This testing adjustment provides
an automatic analysis apparatus that does not await on animal estimation for aftereffect calculations.
However, PSQM was originally advised for circuit-switched networks and does
not booty into annual the furnishings of jitter and packet loss.
PESQ measures the aftereffect of end-to-end arrangement conditions, including codec processing,
jitter, and packet loss. Therefore, PESQ is the adopted adjustment of testing articulation affection in
an IP network. Table 2-3 offers a allegory of the appearance offered by MOS, PSQM,
and PESQ.
Table 2-3 Affection Altitude Comparison
Feature MOS PSQM PESQ
Test adjustment Abstract Cold Objective
End-to-end packet accident analysis Inconsistent No Yes
End-to-end jitter analysis Inconsistent No Yes