Julio C. B. Torres

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Technological advances and increasing availability of high-resolution satellite imagery offer the potential for more accurate land cover classifications and pattern analyses, which could greatly improve the detection and quantification of land cover change for conservation. Such remotely-sensed products, however, are often expensive and difficult to(More)
The properties of an adaptive filter structure which employs a wavelet to decompose the input signal and sparse adaptive filters in the subbands are investigated in this paper. The necessary conditions on the structure parameters for the exact modeling of an arbitrary linear system with finite impulse response (FIR) are derived. An analysis of the(More)
In this paper, an efficient method for modeling Head-Related Transfer Functions (HRTFs) of an auralization system is presented. The proposed model is based on the decomposition of the impulse response of the HRTFs by wavelet transforms. Through an analysis of the HRTF energy content per subband it is shown how the model can be reduced without introducing(More)
An efficient method for modeling head-related transfer functions (HRTFs) of an auralization system is presented. The proposed model is based on the decomposition of the impulse response of the HRTFs by wavelet transforms and on the grouping of such functions for close directions. Through an analysis of the HRTF energy content per subband, it is shown how(More)
This paper presents a new HRTF (Head Related Transfer Function) interpolation technique for three-dimensional sound generation. The proposed approach is based on the determination of the optimal weights to be applied to the HRTF coefficients of neigh-boring positions in the wavelet domain in order to obtain the HRTF at a given point. The proposed method is(More)
The postharvest treatment and processing of fresh coffee cherries can impact the quality of the unroasted green coffee beans. In the present case study, freshly harvested Arabica coffee cherries were processed through two different wet and dry methods to monitor differences in the microbial community structure and in substrate and metabolite profiles. The(More)
In this paper, we propose an experimental method for quantitative description of the error expected from a stereophotogrammetric measurement system. The dimensioning error clearly appears as a function of the difference between the positions of the object and of the calibration grid, which is an intuitively appealing result. This result is useful for the(More)
References 595 CONTENTS Policies adopted to mitigate global warming will have implications for specific sectors, such as the coal industry, the oil and gas industry, electricity, manufacturing, transportation and households. A sectoral assessment helps to put the costs in perspective , to identify the potential losers, and the extent and location of the(More)
In the companion paper “Hybrid method for numerical simulation of room acoustics with auralization: Part 1– Theoretical and numerical aspects” a new hybrid method for numerical simulation of room acoustics, implemented by the software RAIOS 3, was presented. Here, the software itself and its main features are discussed. It will be shown that the proposed(More)
Abstract: In the last ten years, it can be observed an increasing number of immersive audio systems. This growing is due mainly to new technologies trying to simulate the human sensation to be immersed in a real ambient. An example is the inclusion of audio tracks in DVDs recorded with dummy heads, trying to recreate the recording space in the reproduction.(More)
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