Articles

Motion Compensation on DCT Domain

Alternative fully DCT-based video codec architectures have been proposed in the past to address the shortcomings of the conventional hybrid motion compensated DCT video codec structures traditionally chosen as...

Authors: Ut-Va Koc and K. J. Ray Liu

Efficient Implementation of Nested-Loop Multimedia Algorithms

A novel dependence graph representation called the multiple-order dependence graph for nested-loop formulated multimedia signal processing algorithms is proposed. It allows a concise representation of an entire f...

Authors: Surin Kittitornkun and Yu Hen Hu

Onset Detection in Surface Electromyographic Signals: A Systematic Comparison of Methods

Various methods to determine the onset of the electromyographic activity which occurs in response to a stimulus have been discussed in the literature over the last decade. Due to the stochastic characteristic ...

Authors: Gerhard Staude, Claus Flachenecker, Martin Daumer and Werner Wolf

Generalized Method for Sampling Spatially Correlated Heterogeneous Speckled Imagery

This paper presents a general result for the simulation of correlated heterogeneous targets, which are present in images corrupted by speckle noise. This technique is based on the use of a correlation mask and...

Authors: Oscar H. Bustos, Ana G. Flesia and Alejandro C. Frery

LUM Smoother with Smooth Control for Noisy Image Sequences

This paper focuses on adaptive structure of LUM (lower-upper-middle) smoothers for noisy image sequences. For the balance between noise suppression and signal-detail preservation, the LUM smoothers are widely ...

Authors: Rastislav Lukàč and Stanislav Marchevskỳ

Robust Control Methods for On-Line Statistical Learning

The issue of controlling that data processing in an experiment results not affected by the presence of outliers is relevant for statistical control and learning studies. Learning schemes should thus be tested ...

Authors: Enrico Capobianco

The Use of Adaptive Frame for Speech Recognition

We propose an adaptive frame speech analysis scheme through dividing speech signal into stationary and dynamic region. Long frame analysis is used for stationary speech, and short frame analysis for dynamic sp...

Authors: Sam Kwong and Qianhua He

Software Optimization of Video Codecs on Pentium Processor with MMX Technology

A key enabling technology for the proliferation of multimedia PC's is the availability of fast video codecs, which are the basic building blocks of many new multimedia applications. Since most industrial video...

Authors: Pohsiang Hsu and K. J. Ray Liu

A Millennium Start

Authors: K. J. Ray Liu

Analysis and Synthesis of Pseudo-Periodic -Like Noise by Means of Wavelets with Applications to Digital Audio

Voiced musical sounds have nonzero energy in sidebands of the frequency partials. Our work is based on the assumption, often experimentally verified, that the energy distribution of the sidebands is shaped as ...

Authors: Pietro Polotti and Gianpaolo Evangelista

Multi-Channel Sub-Band Speech Recognition

Two distinct fields of research into robust speech recognition are the use of microphone arrays for signal enhancement and the use of independent frequency sub-band models for robust recognition. In this artic...

Authors: Iain A. McCowan and Sridha Sridharan

Generalization of a 3-D Acoustic Resonator Model for the Simulation of Spherical Enclosures

A rectangular enclosure has such an even distribution of resonances that it can be accurately and efficiently modelled using a feedback delay network. Conversely, a nonrectangular shape such as a sphere has a ...

Authors: Davide Rocchesso and Pierre Dutilleux

Denoising Using Blind Source Separation for Pyroelectric Sensors

This paper deals with a process of denoising based on a Blind Source Separation (BSS) method. This technique is inserted in an experimental device of nondestructive testing. Its excitation is a laser beam and ...

Authors: Regis Huez, Danielle Nuzillard and Alain Billat

Radial Basis Function Networks for Conversion of Sound Spectra

In many advanced signal processing tasks, such as pitch shifting, voice conversion or sound synthesis, accurate spectral processing is required. Here, the use of Radial Basis Function Networks (RBFN) is propos...

Authors: Carlo Drioli

Editorial

Authors: Kenneth E. Barner, Gonzalo R. Arce, Giovanni L. Sicuranza and Ilya Shmulevich

Audio Effects Based on Biorthogonal Time-Varying Frequency Warping

We illustrate the mathematical background and musical use of a class of audio effects based on frequency warping. These effects alter the frequency content of a signal via spectral mapping. They can be impleme...

Authors: Gianpaolo Evangelista and Sergio Cavaliere