Nortel Networks Corporation

Ayman M Radwan

Rafik Alphonse Goubran

Mohamed Samy El-Hennawey

Lijing Ding

An apparatus (), method, and computer program to assess VoIP speech quality () using access to degraded signals is provided. Different types of impairment () have different effect, on speech quality. Preferred embodiments address up to four different types of impairment that affect VoIP signal quality: packet loss (), speech clipping in time (), noise () and echo. An overall assessment algorithm factors in degradation due to various impairment factors to generate an overall speech quality assessment score or value.

Method and apparatus for non-intrusive single-ended voice quality assessment in VoIP

An apparatus (), method, and computer program to assess VoIP speech quality () using access to degraded signals. Different types of impairment () have different effect on speech quality. Preferred embodiments address two distinct types of impairment that are unique to VoIP: packet loss () and speech clipping in time ().

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Kingston, Canada

Ayman M Radwan