Encontrados 15 documentos, a visualizar página 1 de 2
Assessing the Quality of Visualizations Produced Using Volume Rendering: Experi...
Beatriz Sousa Santos; José Nunes; Carlos Coimbra; Carlos Ferreira; Ana Maria Tomé; Nuno LauA set of parameters to assess the objective quality of visualizations of a voxel based data set, produced using a ray caster, is proposed as a first step toward the evaluation of the overall quality of these visualizations.Results obtained using synthetic data and a simple implementation of a ray caster are presented. The final goal of this evaluation will be the computation of “c...
Sistema de Codificação de Voz de Alta Qualidade com Banco de Filtros
Elizabeth Fernandez; Luís Nuno Silva; João Rodrigues; Ana Maria Tomé; Francisco VazThis paper describes a high quality speech coding system based in the ITU Recommendation G.722 “7 kHz audio coding within 64 kbit/s”. Provides a high-level description of the recommended algorithm and a brief discussion about the arithmetical choices, which have been made. Some performance results are provided. ; Este artigo descreve um sistema de codificação ...
Representação Visual do Modelo Articulatório para o Estudo da Produção da Fala
António Branco; Ana Maria Tomé; Francisco VazIn this paper we present the description of an articulatory speech synthesiser which is to be used as a tool for the study of speech production. The sound might be produced as the result of vocal tract configurations edited by the user. It also allows the study of the inverse problemthe estimation of a vocal tract configuration given a speech sound. ; Neste artigo descreve-se a im...
Visualização de Dados Obtidos por Ground Penetrating Radar: Estudo de um caso
Vitor Simões Ribeiro; Beatriz Sousa Santos; Fernando Almeida; Ana Maria ToméA case study corresponding to the visualization of an underground volume data, obtained by Ground Penetrating Radar (GPR), is presented. This case study intended to show the interest for geophysic data interpretation provided by volume vizualization of this type of data and allowed a better understanding of the issues involved. ; Neste trabalho apresenta-se o estudo de um caso&nbs...
Advanced Audio Compression for Multimedia
Lars Rüdiger; Ana Maria Tomé; João Manuel RodriguesThis paper reports the implementation of a coding system that includes the psychoacoustic aspects of the human ear to achieve compression of audio data while keeping the quality of the audio signal after the reconstruction. ; Este artigo descreve a implementação de um sistema de codificação que integra aspectos psico-acústicos do ouvido humano pa...
Visual Representtion of the Articulatory Model to Study Speech Production
António Alberto Lebre dos Santos Branco; Ana Maria ToméIn this work we present an articulatory synthesiser which models the vocal tract apparatus with slowly varying physiological parameters (e.g. tongue body, lips, velum, etc). The articulatory distance model that is used was first developed by Mermelstein(l973). (...)Keywords: tract vocal models; articulatory synthesizer; kohonen neural networksM.S., 1997more info. http://opac.ua.pt/F/?func=find-b&f...
Visualização e Armazenamento de Sinais Biológicos
Filipe Trancho; Ricardo Conceição; Osvaldo Rocha Pacheco; Ana Maria ToméIn this paper, we describe an application to visualize biological events, particulary suited to neurophisiology environments. The application requirements are based on the poligraphic record. The application was developed using Object-Oriented techniques suported by Borland C++ compiler and its ObjectWindows library and Resource Workshop. ; Neste artigo descreve-se uma aplicação para visualiza&cc...
Monitorização de Pressão Arterial
João Fernandes; João Martins; José Manuel Oliveira; Ana Maria ToméIn this paper, we describe an arterial pressure monitoring system. The system, based on personal computer, adquires, processes and display the signals and results envolved on particular medical procedure. The system requirements were specified with the cooperation of the medical staff. The system’s software was developed using object programing techniques. ; Neste artigo &ea...
Sistema de Aquisição de Sinais Biológicos
Rui Paulo Ferreira; Rui Pedro Alves; Ana Maria Tomé; Osvaldo Rocha PachecoIn this paper we describes an acquisition system to deal with biological signals. The system modularity and versatility allows its configuration to different environment (such as a neurophisiology laboratory). The system is also suited to test signal processing algorithms on the acquired or stored biological signals. ; Neste artigo apresentamos um sistema para aquisiç&atild...
Sistema Automático Para a Monitorização de Exames Neurofisiológicos de Sono
José Manuel Oliveira; Ana Maria ToméThis paper describes an integrated sleep analysis automatic system, meant to be used on a Neurophysiology Department, on clinical daily routine. In order to achieve modularity, expandibility and flexibility, the system was developed using the Object Oriented Desugn methodology. ; Este artigo descreve um sistema automático para a análise de exames neurofisiológicos ...
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