An extended two-dimensional vocal tract model for fast acoustic simulation of single-axis symmetric three-dimensional tubes

The simulation of two-dimensional (2D) wave propagation is an affordable computational task and its use can potentially improve time performance in vocal tracts' acoustic analysis. Several models have been designed that rely on 2D wave solvers and include 2D representations of three-dimensional (3D) vocal tract-like geometries. However, until now, only the acoustics of straight 3D tubes with circular cross-sections have been successfully replicated with this approach. Furthermore, the simulation of the resulting 2D shapes requires extremely high spatio-temporal resolutions, dramatically reducing the speed boost deriving from the usage of a 2D wave solver. In this paper, we introduce an in-progress novel vocal tract model that extends the 2D Finite-Difference Time-Domain wave solver (2.5D FDTD) by adding tube depth, derived from the area functions, to the acoustic solver. The model combines the speed of a light 2D numerical scheme with the ability to natively simulate 3D tubes that are symmetric in one dimension, hence relaxing previous resolution requirements. An implementation of the 2.5D FDTD is presented, along with evaluation of its performance in the case of static vowel modeling. The paper discusses the current features and limits of the approach, and the potential impact on computational acoustics applications.Comment: 5 pages, 2 figures, Interspeech 2019 submissio

Fragmentos de cerâmica brasileira

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Music expression with a robot manipulator used as a bidirectional tangible interface

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Scenography of immersive virtual musical instruments

International audienceImmersive Virtual Musical Instruments (IVMIs) can be considered as the meeting between Music Technology and Virtual Reality. Being both musical instruments and elements of Virtual Environments , IVMIs require a transversal approach from their designers, in particular when the final aim is to play them in front of an audience , as part of a scenography. In this paper, we combine the main constraints of musical performances and Virtual Reality applications into a set of dimensions, meant to extensively describe IVMIs stage setups. A number of existing stage setups are then classified using these dimensions, explaining how they were used to showcase live virtual performances and discussing their scenographic level

eLaparo4D: A Step Towards a Physical Training Space for Virtual Video Laparoscopic Surgery

The paper presents the preliminary implementation of eLaparo4D, an immersive training space designed for videolaparoscopic surgery. This is a low-cost training space which integrates haptic devices with realistic surgery tools and 3D rendering with physically deformable 3D CG models of the human internal organs. The main objective of the eLaparo4D first prototype is to design effective training exercises for medicine students within a realistic scenario of a videolaparoscopic operating room. The simulator is based on a client/server layered architecture in order to act as a sort of data gateway: the hardware is interfaced with the physics 3D engine to obtain real-time performances, with an HTML5-based 3D output visual interface in order to integrate the tracking of operating sessions within a custom training platform

eLaparo4D: first prototype of a physical training space for videolaparoscopic surgery

none5M. Gaudina; V. Zappi; E. Bellanti; G. Vercelli; F. MandolfinoGaudina, Marco; V., Zappi; E., Bellanti; Vercelli, GIANNI VIARDO; F., Mandolfin

Reserveringssystem för sittplatser som webbtjänst

Detta lärdomsprov behandlar uppbyggnaden av ett internetbaserat reserveringssystem för sittplatserna i Lumivaaras kyrka. Tanken med lärdomsprovet är att ge en inblick i uppbyggnaden av systemet. Det skall ske genom att presentera själva systemet, samt de tekniker, programmeringsspråk och verktyg som använts. Läsaren kommer att få en presentation av de olika delarna i systemet, men den huvudsakliga presentationen kommer att inriktas på själva sittplatsernas presentation i systemet, eftersom det har varit den största delen av arbetet. Reservationssystemet är främst uppbyggt med PHP, XHTML och CSS. Som databas har MySQL använts.This thesis described the development of a web –based system for the reservation of seats at Lumivaara church. The aim was to give an overview of the system. This happened through a presentation of the system itself, the techniques as well as the programming languages and tools used. The reader is given a general overview of the different parts of the system, but the main area of concentration will be the seats that are shown in the system, as this section was the most time consuming and labourous part of the whole process. The seat reservation system is mainly built with PHP, XHTML and CSS. As a database MySQL was used