Sergio Feijóo

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The vocal quality of 64 normal subjects and 57 subjects suffering various degrees of glottal cancer was investigated using acoustic measures of six different aspects of the voice signal: tone period perturbation, amplitude perturbation, waveform perturbation, vocal noise, spectral periodicity and spectral distortion. The measures were estimated taking the(More)
The role of fricative context on vowel recognition in a series of FV syllables being part of natural Spanish words is investigated. Perceptual tests were carried out to assess the recognition of vowels in fricative context, in two conditions: 1) Isolated vowel; 2) Fricative noise + vowel. Analysis of results show that adding the fricative noise improves the(More)
In this work, a method is proposed to quantify the efficiency of carbon utilization by soil microbes. Microcalorimetry was used to compute the heat yield (Y(Q/X)) of six soil samples collected in the Amazon. A combined mass and energy balance is developed to quantify the enthalpy of the glucose oxidation reaction (Delta(r)H(s)) and the biomass yield(More)
The perceptual interaction between adjacent CV segments is studied in Fricative-Vowel syllables from a coarticulatory point of view. The results of a perceptual experiment with conflicting-cue stimuli are analyzed under the assumption, supported by the results, of the possible influence of F-to-V carryover coarticula-tion on the integration process. The DAC(More)
The interaction of consonantal and vocalic segments in FV syllables regarding identification of place of articulation of frica-tives has been studied. A probabilistic model for integration of acoustic information in both segments is proposed. The model weights each segment's contribution and integrates them in order to resemble listeners' perception. First,(More)
The calculation of parameters involved in the kinetics of the microbial soil reactions linked to the carbon cycle is strongly limited by the methodologies employed. Hence, a mathematical model is proposed to quantify easily the specific rate of catabolic activity A(c) by microcalorimetry based on Belaich's model. It permits to quantify A(c) from the plots(More)