In this work, the impedance response of a set of trombones is analysed in order to find correlations between their sound and timbre and the main characteristics of the impedance curves. For this specific application, an impedance tube has been designed and manufactured to measure the different trombones' impedance curves. A plastic trombone (P-Bone) has been considered in the experiments to determine the importance of the material used to fabricate the instrument. In order to parametrise the trombones considered here, the instrument profile has been theoretically studied using a conical approach. More precisely, the tube and bell cone of the trombone has been discretised along its length in a set of small conical segments. Also, the influence of the mouthpiece is considered in the analytical formalism, and all these factors are optimised by employing a genetic algorithm (GA) to find the physical parameters that fit the experimental impedance curves. The experimental results are also compared with the opinions obtained from a survey about the subjective assessment of the same music passage recorded with the different instruments considered here. The results show that the impedance curve and some of the fitted parameters obtained correlate with the assessment of trombones in the blind survey. Moreover, the quality of the impedance tube here designed reveals that it is an excellent option to find leakages or dysfunction in this instrument.
La presión de la obra de. arteEl 1 objeto, no nos engañemos, nunca ha sido pasivo al permitir su exposi ción,. ha exigido determinadas condiciones. Sin embargo esta actitud ha ad quirido niveles muy diferentes en los últimos treinta años. Analicemos el por qué.Históricamente, los cambios que se establecían en el mundo exposi tivo, venían de la mano de tres transformaciones principales: la concepción social que cada perio do tenía de la exposición, los cam bios internos que repercutían en la institución museística y finalmente las r�glas estilís. ticas del contene dor, es decir de la arquitectura. Alta velocidad, la continuidad.A partir del Barroco, se va superponiendo a estos problemas, una paula tina separación de la obra con respecto al espacio. La nueva concepción in terior de la arquitectura con los muros despojados de ornamentos, confun den a la obra que se encuentra perdida: cubre todo el muro, emplea la am bientación y escenografía para encontrarse con. él y establece las reglas del marcó pictórico (teoría del marco).Con las vanguardias, la separación espacial y conceptual entre obra y es pacio. ya es evidente. Se enuncia sin tapujos. El espaldarazo definitivo lo da Marcel Duchamp con sus trabajos en vidrio, claramente ya separados del
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