CARLab seminars are usually held during semester (teaching weeks) in room 830, Building J03. This is always subject to change, however, so please check this page close to the day of the seminar of interest or check by email here. Directions to CARLab can be found here.
The two seminars listed below are supported by the Human Centred Technology Cluster.
2pm Rm 830 April 29, 2015
Title: “Parametric spatial audio techniques for recording, reproduction and beamforming”
Presenter: Symeon Delikaris-Manias, doctoral candidate from Aalto University, Finland
Abstract: Spatial audio systems are commonly utilized for sound-field analysis and reconstruction or signal enhancement algorithms. The algorithms used for spatial audio processing can be divided into two main categories. Linear techniques, which operate directly to the sensor signals or a decomposed version of these, by using for example the spherical harmonic framework or the two-dimensional Fourier transform and parametric techniques that operate in the time-frequency domain by taking into consideration a physical or perceptual model of the sound field. This presentation discusses these different approaches and focuses on two novel developments in the field of parametric spatial audio processing: A parametric spatial filtering technique, the cross pattern coherence (CroPaC). CroPaC utilizes coherence-based measures between spherical harmonic signals of different orders as a criterion for focusing in specific directions. (REF: “Cross Pattern Coherence Algorithm for Spatial Filtering Applications Utilizing Microphone Arrays”, Audio, Speech, and Language Processing, IEEE Transactions on (Volume:21 , Issue: 11 ) , November 2013) . A perceptually motivated parametric sound field recording and reproduction technique for sound reproduction (REF: “Parametric binaural rendering utilising compact microphone arrays”, accepted in ICASSP 2015).
Bio: Symeon Delikaris-Manias received his B.Sc. degree in mathematics from the University of Crete, Heraklion, Greece in 2006 and his M.Sc. degree in sound and vibration from the institute of sound and vibration research (ISVR), Southampton, UK, in 2008 with a thesis on inverse-filtering methods for sound reproduction systems. Between 2008-2010, he was employed by GSacoustics as an acoustic consultant, and was responsible for acoustic modelling, development of sound reproduction techniques and auralization. Between 2010-2011 he was employed as a research at the Center for Virtual Reality, Brest, France developing and evaluating sound-field recording and reproduction techniques for ship simulators for the French Navy. He is currently pursuing his doctoral degree in Electrical Engineering at Aalto University, Espoo, Finland and his research focuses on developing techniques for parametric spatial audio processing utilising acoustic arrays.
2:30pm Rm 830 April 29, 2015
Title: "Strategies for Parametric Sound Field Recording and Reproduction”
Presenter: Archontis Politis, doctoral candidate from Aalto University, Finland
Abstract: Spatial sound reproduction methods for recorded sound scenes are an active field of research, in parallel with the evolving vision-related or multi-modal technologies that aim to deliver a new generation of immersive multimedia content to the user. This presentation focuses specifically on techniques that try to render the recorded sound scene as perceptually close to the original as possible. Contrary to non-parametric methods, which are based on a passive decoding of the recorded signals to loudspeakers or headphones, parametric methods impose a model on the sound field and aim to estimate adaptively its parameters in a time-frequency domain from the recordings. This parameterization permits great flexibility in terms of scene manipulation, coding and rendering to arbitrary setups. We give a short overview of some parametric rendering strategies and present in more detail the recent example of the Sector-based Directional Audio Coding method developed in our lab.
Bio: Archontis Politis obtained his M.Eng. degree in Civil Engineering at Aristotle’s University of Thessaloniki, Greece, and his M.Sc. degree in Sound & Vibration Studies at ISVR, University of Southampton, UK, in 2006 and 2008 respectively. From 2008 to 2010 he worked as a graduate acoustic consultant at Arup Acoustics, Glasgow, UK, and as a researcher in a joint collaboration between Arup Acoustics and the Glasgow School of Arts, on interactive auralization of architectural spaces using 3D sound techniques. He is currently pursuing a doctoral degree in the field of parametric spatial sound recording and reproduction in Aalto University, Finland.