Nokia

About: Nokia is a company organization based out in Espoo, Finland. It is known for research contribution in the topics: Signal & Mobile station. The organization has 16625 authors who have published 28347 publications receiving 695725 citations. The organization is also known as: Nokia Oyj & Oy Nokia Ab.

Defining grief play in MMORPGs: player and developer perceptions

Abstract: In current literature, grief play in Massively Multi-player Online Role-Playing Games (MMORPGs) refers to play styles where a player intentionally disrupts the gaming experience of other players. In our study, we have discovered that player experiences may be disrupted by others unintentionally, and under certain circumstances, some will believe they have been griefed. This paper explores the meaning of grief play, and suggests that some forms of unintentional grief play be called greed play. The paper suggests that greed play be treated as griefing, but a more subtle form. It also investigates the different types of griefing and establishes a taxonomy of terms in grief play.

Cross-lingual phoneme mapping for multilingual synthesis systems.

Abstract: Development of a multilingual text-to-speech (TTS) system usually requires a lot of time, effort and language resources. Furthermore, the implementation tends to consume large amounts of memory as the number of supported languages increases. This paper proposes a simple method for quickly increasing the language portfolio of an existing TTS system with the minimal effort and memory consumption. The crosslingual phoneme mapping modifies the phonetic transcription of a new language by presenting it with the phoneme set supported by an existing TTS system. The synthesis output of the mapped language is phonetically quite accurate but the intonation is based on the existing target language. The evaluations showed that the cross-lingual phoneme mapping could provide an adequate quality synthesis when the language portfolio must rapidly be expanded and the memory and the language resources are scarce. The method is applied best for the synthesis of short utterances including names and isolated words.

Viewport-Adaptive Encoding and Streaming of 360-Degree Video for Virtual Reality Applications

Abstract: Virtual reality applications use 360-degree videos and head mount displays (HMDs) with stereoscopic capabilities to provide full immersion experience. In these applications it is also common to use 4K resolution or higher per view for 360-degree videos. Consequently, this leads to technical challenges in handling the bandwidth requirements while keeping the system latency to the minimal. When the content is viewed with a HMD, a subset of the entire 360-degree video is displayed at a single point of time. To improve the resolution and picture quality of the displayed content, viewport based coding is desirable. In this regard, we investigated various viewport dependent projection schemes including the existing variants of Pyramidal projection. In this regard we propose the multi-resolution versions of Equirectangular and Cubemap projections. Additionally, we developed a methodology for comparing the rate-distortion performance of these projections. Based on the simulation results, it was observed that multi-resolution projections of Equirectangle and Cubemap outperform other projection schemes, significantly.

Perceptual-based quality assessment for audio-visual services: A survey

Abstract: Accurate measurement of the perceived quality of audio-visual services at the end-user is becoming a crucial issue in digital applications due to the growing demand for compression and transmission of audio-visual services over communication networks. Content providers strive to offer the best quality of experience for customers linked to their different quality of service (QoS) solutions. Therefore, developing accurate, perceptual-based quality metrics is a key requirement in multimedia services. In this paper, we survey state-of-the-art signal-driven perceptual audio and video quality assessment methods independently, and investigate relevant issues in developing joint audio-visual quality metrics. Experiments with respect to subjective quality results have been conducted for analyzing and comparing the performance of the quality metrics. We consider emerging trends in audio-visual quality assessment, and propose feasible solutions for future work in perceptual-based audio-visual quality metrics.

Measurement reporting in a telecommunication system

Abstract: The basic idea of the present invention is to specify at least two different triggers for sending a measurement report from the mobile station to the network According to the invention, the network specifies the triggers to be used in different measurement report types The triggers are preferably upper or lower threshold values for parameters of the radio signal In response to having detected that the measured value has exceeded its upper threshold value or gone under its lower threshold, the mobile station sends the network a measurement report