Examinando por Materia "Sonómetro"
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- PublicaciónAcceso abiertoAnálisis de la incertidumbre asociada al georreferenciamiento de mediciones de ruido ambiental en la calibración de mapas de ruido(2019) Puerta Pareja, Juan Ricardo; Cuervo Ospina, Guillermo Andrés; Molina Jaramillo, AlejandroThis research proposes a methodology to quantify the uncertainty effect associated with the georeferencing process in noise maps calibration, based on the calculation of the expanded uncertainty proposed by the P hD.M iguelAusejoP rieto. Field measurements were made with two simultaneous sound level meters, one of them varied it’s location taking into account the maximum tolerance that three different GPS devices have; the other level meter remained fixed at one point in order to have a reference to make a comparison between the captured simultaneously levels by the two sound level meters. The measurements were carried out in three different scenarios, in two configurations, in the peak and valley schedules and considering that the main source of noise was road traffic. In addition, this procedure was recreated by simulation methods using the German model RLS-90. With the levels obtained the calculation of the expanded uncertainty was made, taking into account a coverage factor K = 2, which guarantees a confidence level of 95,45%. On the one hand the ± 3 dB criterion was evaluated, for the uncertainty levels obtained by the fixed sound level meter and the other hand, for the uncertainty levels found in the combination of the fixed and mobile sound level meter, including the biggest desviations in each one of them. Both in the results of the measurement in the simulation process there was not enough evidence to state that the accuracy of a GPS affects the calibration of a noise map, this was verified using the Wilcoxon’s rank test, which evaluates if the difference between two random samples differ significantly from zero
- PublicaciónAcceso abiertoDesarrollo de un sistema de adquisición del nivel de presión sonora y variables climáticas utilizando sistemas embebidos.(Universidad de San Buenaventura, 2014-03) Arias Sabogal, Nicolás Andrés; Rosas Jiménez, Nelson Felipe
- PublicaciónAcceso abiertoDesign of a protocol for the measurement of physiological and emotional responses to sound stimuli(2017) Macía Arango, Andrés Felipe; Ochoa Villegas, JonathanA protocol for the measurement of physiological and emotional responses to sound stimuli is presented. The sounds used in the study were created by comparing different methods and possible bandwidths. These sounds correspond to white noise filtered in 3 central frequencies, to know, 125 Hz, 500Hz, and 3150Hz, with a variable bandwidth based on 1/3 octaves. additionally, spatial information was given to the sounds by convolving them with a simulated binaural impulse response. Two experiments were conducted. The first one consisted of 3 sounds created at different sound pressure levels, between 50 dB and 80 dB in 6 steps. It was found that both valence and arousal changed as the level increased, the first one decreasing, and the last one increasing, showing a possible relation between elicited emotions from a sound and its sound pressure level. The second experiment presented both image and sound simultaneously. The sound corresponded to the same described above, at a fixed level of 65dB. The images were two, one with a positive semantic content, and the other with a negative one. Both images were taken from the IAPS (International Affective Picture System). Responses were measured with the self assessment manikin SAM and Noldus FaceReader technology. The results obtained with the SAM were not conclusive, probably due to sample size, experiment design and other factors. The results obtained with the FaceReader showed clear reactions from participants to the audiovisual.