Interactions in Perceived Quality of Auditory-Visual Displays
Presence: Teleoperators and Virtual Environments
Rate control for H.264 with two-step quantization parameter determination but single-pass encoding
EURASIP Journal on Applied Signal Processing
A crowdsourceable QoE evaluation framework for multimedia content
MM '09 Proceedings of the 17th ACM international conference on Multimedia
PEMO-Q—A New Method for Objective Audio Quality Assessment Using a Model of Auditory Perception
IEEE Transactions on Audio, Speech, and Language Processing
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Using our novel methodology for quality evaluation of long duration multimedia content, the effect of the time dimension on quality ratings and user responses is investigated. Particularly, the influence of audio artifacts related to different compression rates on participants' reactions to quality changes over extended periods of time is examined. Results of the first study suggest that participants' quality expectations are rather constant throughout the entire duration of the 30-minute long clip, which also holds for subjects' reaction time to quality degradations. Furthermore, it turns out that the test persons are more sensitive to quality changes when they are able to influence the quality themselves. In addition to the first study, two experiments were conducted in which cross-modal effects between the visual and auditory modality were investigated. The findings indicate that it is significantly easier for participants to discover quality changes when impairments are introduced in both the auditory and visual modality at the same time than when distortions occur in the audio or video domain solely.