Sebastian Moller's research while affiliated with Deutsches Forschungszentrum für Künstliche Intelligenz and other places

Publications (111)

Article
Telecommunication service providers have to guarantee acceptable speech quality during a phone call to avoid a negative impact on the users’ quality of experience. Currently, there are different speech quality assessment methods. ITU-T Recommendation G.107 describes the E-model algorithm, which is a computational model developed for network plannin...
Article
Full-text available
This paper investigates the possibility to estimate the perceived Quality of Experience (QoE) automatically and unobtrusively by analyzing the face of the consumer of video streaming services, from which facial expression and gaze direction are extracted. If effective, this would be a valuable tool for the monitoring of personal QoE during video st...
Preprint
Cloud Gaming is an emerging service that catches growing interest in the research community as well as industry. While the paradigm shift from a game execution on clients to streaming games from the cloud offers a variety of benefits, the new services also require a highly reliable and low latency network to achieve a satisfying Quality of Experien...
Article
Full-text available
Communication service providers use specialized solutions to evaluate the quality of their services. Also, different mechanisms that increase the network robustness are incorporated in current communication systems. One of the most accepted techniques to improve the transmission performance is the MIMO system. In communication services, the voice q...
Conference Paper
Full-text available
With emerging delay sensitive gaming services such as cloud gaming and online gaming, the importance of understanding and reducing the effect of delay on the gamer's Quality of Experience (QoE) becomes highly important for the success of these services. In this paper, the findings of two subjective experiments investigating the relationship between...
Conference Paper
Recent advances in Virtual Reality (VR) technologies have resulted in a wider availability of Head Mounted Displays (HMDs). However, it is still unclear if VR gaming offers a substantial added value to players. For this reason a comparison of gaming experiences on VR HMD to those on mobile and PC, two other popular gaming platforms, is performed by...
Conference Paper
Location-based mobile tools provide effective means for mobile participation, allowing better targeting of users and faster opinion gathering for municipalities and organizations. For participation purposes it is essential to reach the users as widely as possible, and for this, smartphones with ever-increasing adoption rates offer an optimal tool....
Article
Mobile apps running on smartphones have not only become a popular means for providing mobile services. Due to their relatively easy and cheap implementation, they have also developed into scientific tools for studying mobile human-computer interaction (HCI) in realistic usage contexts, providing qualitative and quantitative data about usage pattern...
Article
Physiological measures such as electroencephalography (EEG) have been successfully introduced to the area of quality of experience. Most of these studies used short stimuli, and showed significant differences in the EEG signal between high quality and low quality conditions. The effect of longer low quality sequences, and how these affect the cogni...
Article
In this study we focus on the influence of the voice of a speech corpus on the quality of text-to-speech (TTS) systems. Therefore, we selected a set of attribute scales which consists of items related to the 5 perceptual quality dimensions of TTS systems and of items which are used in studies concerning the likeability of voices. We selected 5 diff...
Article
In this paper, we will compare several approaches for predicting the quality of entire speech-only or audio-visual telephone calls from subjective judgments or predictions of the quality of individual segments of these calls. The comparison will be done using several databases which have been collected in a test paradigm to simulate conversational...
Conference Paper
Full-text available
It is commonly acknowledged that the introduction of wideband and super-wideband speech transmission in Voiceover- IP leads to an improved overall quality compared to traditional narrowband telephony. However, beyond overall quality, dimensions such as coloration, continuity, noisiness, loudness, human speaker identification ability, as well as aut...
Conference Paper
Cloud based games have significantly larger network bandwidth requirements when compared with traditional online games (up to two orders of magnitude). Differences in transmission characteristics can be observed not only between various cloud gaming platforms, but also between different games played on the same platform. As the differences between...
Conference Paper
The Android OS has a permission-based security system that controls the third party applications' access to sensitive information on the smartphone. The risk evaluation is left to the user who has to evaluate whether or not the requested permissions are appropriate. However, former work has shown that users lack attention to and understanding of th...
Article
Full-text available
Using less bandwidth on the one hand and delivering high quality content on the other hand is one of the big goals for video service providers. Standardized rating tests are commonly used to quantify audiovisual quality. In order to better understand the neuronal processes underlying these quality ratings physiological measures may provide insights...
Conference Paper
Full-text available
Quality of Experience (QoE) is a human-centric paradigm which produces the blue print of human behavioral states such as perception, emotion, cognition and expectation. Recent advances in neurophysiological monitoring tools have facilitated the study of frequency, time and location of neuronal activity to an unprecedented degree, as well as opened...
Conference Paper
Full-text available
Together with the variety of networks, diverse terminals and devices, such as telephones with handset or hands-free mode, mobile phones and headsets, are commonly available for everyday calls. We conducted an auditory test to examine the combined influence of these user interfaces, audio bandwidths, coding schemes and packet loss on human speaker i...
Conference Paper
Subjective speech quality assessment depends on listener “quality” opinions after hearing a particular test speech stimulus. Subjective scores are given based on a perception and quality judgment process that is unique to a particular listener. These processes are postulated to be dependent on the listener's internal reference of what good and bad...
Conference Paper
Full-text available
Telecommunication systems available today allow efficient voice transmission through channels of different audio bandwidths and terminated with different user interfaces. However, the sending and receiving user interface, the bandwidth limitation and the effects of lossy signal compression degrade the quality of the received signal and impede an un...
Conference Paper
Quality aspects of media content are usually assessed by using subjective rating methods where subjects provide active feedback towards the perceived quality. The process how this judgment is being formed and the long-term influences of accompanying physiological processes are not represented by these methods. In this paper we used the electroencep...
Conference Paper
Evaluating the quality of text-to-speech systems (TTS) is usually achieved by subjective methods where parti