XXIX Simpósio Brasileiro de Telecomunicações

In this article we discuss the capabilities and importance of data selection mechanisms in real-world tasks. We show how data-selective adaptive filters can be explored in order to improve the performance of communication systems and acoustic echo cancellers. For communications systems we propose a dataselective algorithm for semi-blind equalization...

In this paper, we explore the propagation of highquality predictions in low-motion or no-motion macroblocks and we propose a simplified mode selection and quantizer parameter adaptation algorithms that increase rate-distortion performance and may potentially reduce encoding complexity of H.264/AVC. Results show that the proposed scheme can...

The recently introduced fountain codes are an important tool to send information trough erasure channels. In this paper a description of the Luby Codes is presented together with a code modification (shortening) that enders a better performance.

Sistemas de reconhecimento automático de locutor(RAL) têm ampla aceitação em diversas áreas e aplicações, tais como a autenticação de transações eletrônicas, ciência forense, segurança e controle de acesso. No entanto, os sistemas de RAL podem sofrer severa degradação de desempenho quando o sinal de voz é capturado em ambientes acusticamente ruidosos....