Abstract / truncated to 115 words (read the full abstract)

Voice-over-Internet Protocol (VoIP) technology provides the transmission of speech over packet-based networks. The transition from circuit-switched to packet-switched networks introduces two major quality impairments: packet loss and end-to-end delay. This thesis shows that the incorporation of packets that were damaged by bit errors reduces the effective packet loss rate, and thus improves the speech quality as perceived by the user. Moreover, this thesis addresses the impact of transmission delay on conversational interactivity and on the perceived speech quality. In order to study the structure and interactivity of conversations, the framework of Parametric Conversation Analysis (P-CA) is introduced and three metrics for conversational interactivity are defined. The investigation of five conversation scenarios based on subjective quality ... toggle 8 keywords

voip – speech quality – interactivity – delay – packet loss – internet telephony – parametric conversation analysis – conversational interactivity

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