Examinando por Materia "Particle velocity"
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- PublicaciónAcceso abiertoComparación de métodos analíticos para la generación de audio personalizado (beamforming)(2018) Pérez Jaramillo, Juan Sebastián; Vega Correa, Juan Sebastián; Murillo Gómez, Diego MauricioThe generation of personalized audio (Beamforming) requiers regularization processes to be viable in non-ideal conditions. The implementation of the Inverse Method could not be achieved because of its big amoung of energy consumption. Based on the above, this work tends to develop a comparison between different methods for the generation of Beamforming with the aim of finding pros and cons of each one of them. Using the software MATLAB a theoretical comparison was done taking into account parameters such as Acoustic Contrast, required energy and sound pressure level withing a given frequency range. That information was validated through a set of subjective tests in which there was taken into account parameters such as Acoustic Contrast, Frequency Response, sound pressure level and level of joy of each method with the subjects beeing interrogated. A numerical and statistical analysis was done in order to get some conclusions of the work in question
- PublicaciónAcceso abiertoDiseño de una metodología alternativa que permita la caracterización de la radiación de una fuente electroacústica mediante el uso de una sonda P-U.(2017) Luján López, Luis Fernando; Estrada Duarte, Sergio Andrés; Molina Jaramillo, AlejandroThrough the study of the standards for the determination of the sound intensity and the traditional measurement protocols to obtain the descriptors of radiation of electroacoustic sources an in situ methodology was designed that allows to estimate, for a Genelec 1032A loudspeaker, the vectorial field of intensity normal to measuring surface using the PU sensor and the Microflown´s Sound Power software. We sought to estimate a scalar and a vector unit, pressure and particle velocity respectively. Through these it was possible to calculate the measured intensity of the under study loudspeaker and thus obtain a representation of the vector field of intensity, a three-dimensional graph of its radiation. It is also understood that the measurements for pressure estimation must be performed under free field conditions, because this variable is affected by the reflections of the measurement environment due it is not of the vectorial type, for which it is not necessary to consider these contributions. An algorithm was developed for the processing of the data, so that the results could be projected on each one of the measurement positions by frequencies of third of octave. The reproducibility of the method was also evaluated by measurements in different acoustic environments. In a site with acoustic treatment the measurement distance is greater than in an enclosure without treatment due to the variation of the near field. In spite of this, it was possible to obtain satisfactory results in both places keeping the same configuration in the measurement elements.