Em Redes Ópticas Elásticas, o problema de rote- amento e alocação de espectro (RSA – Routing and Spectrum Allocation) é comumente solucionado através do us...

• Pedro J. F. C. Souza
• Alex F. Santos
• Karcius D. R. Assis
• Raul C. Almeida Jr
• Matheus R. Sena

• Redes Ópticas Elásticas
• Roteamento e Alo- cação de Rota e Espectro
• Não linearidade
• Modelo IGN

SBrT 2018

O modelo de Tamir é uma das poucas abordagens analíticas para o cálculo da perda de percurso de sinais de rádio em florestas, nas faixas de HF ou VHF. Em q...

• Marinho Alex Kamiroski Melo
• José Carlos Araujo dos Santos
• Maurício Henrique Costa Dias

• Fatores de propagação rádio-móvel terrestre
• radiopropagação HF
• radiopropagação VHF
• vegetação.

SBrT 2011

This paper presents a beamforming algorithm for antenna arrays attending to both power and signal-tointerference-plus-noise (SNIR) ratio constraints. The pr...

• Ciro A. Pitz
• Marcelo G. Vanti
• Orlando J. Tobias
• Rui Seara

• Adaptive antenna arrays
• beamforming algorithm
• duality approach
• LMS-based algorithm

SBrT 2010

The reflection of an acoustic signal on walls or objects in an enclosed environment is perceived as reverbera- tion. It is present daily in conference room...

• F. de S. Farias
• R. Coelho

• The reflection of an acoustic signal on walls or objects in an enclosed environment is perceived as reverbera- tion. It is present daily in conference rooms
• tunnels and any closed spaces. The presence of reverberation can degrade speech intelligibility and the performance of tasks that depend on it
• such as speech or speaker recognition. Many methods were proposed to attenuate this degradation. A family of such methods acts on clean speech
• applying gains on parts of the signal in order to improve intelligible when reverberated. These methods are called adaptive gain methods. This study aims to evaluate the effect of two adaptive gain methods
• Adaptive Gain Control (AGC) and Steady-State Suppression (SSS)
• in speech intelligibility. The evaluation uses four objective measures: Coherence Signal Intelligibility Index (CSII)
• Short Time Objective Intelligibility (STOI)
• Speech Reverberation to Modulation Ratio (SRMR) and Weighted Short Time Objective Intelligibility (WSTOI). Results show that AGC improves speech intelligibility in studied conditions
• while SSS degrades it
• a result in line with subjective measures found in the literature.

SBrT 2018

Linear prediction plays a fundamental role in digital signal processing due to its interesting theoretical and practical aspects. An important application is...

• Renan Brotto
• Kenji Nose Filho
• Romis Ribeiro Attux
• João Romano

SBrT 2019