Encontrados 6 documentos, a visualizar página 1 de 1
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...
Ambient intelligence for monitoring weight and physical activity
Ferreira, João Manuel RodriguesDissertação de mestrado em Engenharia Informática ; We have an increasingly sedentary population without the concern about a healthy diet. Therefore, it becomes necessary to give the population the opportunity, despite living a very busy and tiring life, to have control over important aspects of their health. This work aims to analyze and evaluate the impact of an ambient intelligence system on weight control ...
Monitoring weight and physical activity using an amI setting
Ferreira, João Manuel Rodrigues; Rosário, Rafaela; Costa, Ângelo; Novais, PauloWe have an increasingly sedentary population without the care to make a healthy diet. Therefore, it becomes necessary to give the population the opportunity, despite living a very busy and tiring life, to have control over important aspects to their health. This work aims to present a model of an ambient intelligence system for monitoring the weight and physical activity in active individuals. To accomplish thi...
Análise sísmica de pontes ferroviárias de alta velocidade
Silva, João Manuel Rodrigues daTese de mestrado integrado. Engenharia Civil (especialização em Estruturas). Faculdade de Engenharia. Universidade do Porto. 2008
Codificação Perceptual de Áudio usando Quantização Retro-Adaptativa
João Manuel Rodrigues; Ana Maria Perfeito ToméThis paper presents a new coding/compression algorithm for high-quality digital audio signals. The new codercomprehends a nonuniform filter bank, gain-adaptive logaritbmic quantizers, arithmetic coding, and an explicit psychoacoustic model that adapts the quantizers according to perceptual criteria. The new system differs from other perceptual coders in that its quantizers are backward-adaptive: the adaptation ...
Audio Compression: Discussion of an Alternative Approach
João Manuel Rodrigues; Ana Maria ToméIn this paper we present and dicuss a new algorithm for the compression of audio signals in which we are currently working. Backward-adaptive quantization, a fundamental innovation that differentiates this from other perceptual audio coders, is justified for its multiple advantages. We conclude with a discussion of some issues related to the design of the various components of the ...
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