PAMS
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The importance of measuring voice quality
End-to-end voice quality is the key measure of voice Quality of Service. Assessing it is essential for
equipment selection, monitoring and fault-finding, service level agreements and optimization of networks.
Quality in networks will remain an issue as long as bandwidth and processing power are limited. This applies
across networks of all types, including mobile systems, leased facilities, interconnections and Voice over IP
(VoIP, Internet telephony).
Factors that affect quality include:
Background noise
Silence suppression
Low bit-rate coding
Errors (mobile or packet)
Delay
Echo
Filtering by handsets or the access network
The standard method of voice quality assessment is assessment by panels of human subjects in subjective
tests carried out according to ITU recommendations P.800/P.830. The results of these tests are averaged to
give mean opinion scores (MOS). Such tests are expensive at best and are impractical in the field.
PAMS has been developed to identify audible distortions through an objective process based on human
perception...