Examinando por Materia "Ruido de fondo"
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- PublicaciónAcceso abiertoAnálisis del impacto de ruido de fondo y tiempo de reverberación en procesos cognitivos por medio de Auralizaciones(2017) Escobar Ochoa, Sara; Pérez Betancur, Diana Carolina; Ortega, AlexánderThe research below proposes a method to analyze the influence of reverberation time and background noise upon cognitive processes of attention, memory and executive function. To characterize the acoustic variable (reverberation time) acoustic models are implemented using the software CATT-Acoustic, making auralizations with the messages with four different reverberation time conditions, matching a characteristic enclosure of a learning area from the San Buenaventura University, to use along with the psychological tools. Background noise conditions from the room were measured with a binaural head [Cortex MK2b, 01dB], assessing four of this levels. The pilot test mode applied showed a negligible impact from the acoustic variable on cognitive processes, due to the amount of specimens and variations observed on the application protocol, i.e. examination mode, timekeeping of the test, compromising consequently the results. In a complementary test in which the amount of four specimen groups where increased it showed a positive influence of a high background noise in four components of the verbal memory plot curve, where the attention and memory processes are assessed, and a negative influence of a long reverberation time, in the verbal memory components as well as in the Wechsler memory scale.
- PublicaciónAcceso abiertoDeterminación del efecto causado en procesos cognitivos por el tiempo de reverberación y ruido de fondo mediante el uso de auralizaciones(2018) Restrepo Dávila, Felipe; Ochoa Villegas, JonathanIn this work, the experimental design was presented in the form of a replica, in which a sample of sixty university students was evaluated in order to determine the effect caused by reverberation time and background noise on the cognitive processes of memory, attention and executive functions, seeking to contrast the results obtained in previous researches. Statistical analysis is presented in order to relate the effect of these acoustic parameters. Five psychological instruments were applied where four of these psychological instruments were auralized taking into account the acoustic conditions measured and the hypothetical treatment of the mini auditorium 2 of the University of San Buenaventura, San Benito Medellín. For the application of the test, the recording room of studio A of the University of San Buenaventura Medellín was used and the psychological instruments were reproduced using the Opsodis binaural reproduction system as specified in the connection diagram of section VII.A and the distribution within the recording room as shown in Figure 8. It was found that the results found in previous theses where the impact of reverberation time and background noise on cognitive processes was evaluated are similar, corroborating in the same way the foreign investigations, where it is proven that background noise and reverberation time significantly affect attention, memory and executive functions, being reverberation time the most affected acoustic parameter. High background noise causes interference in the communication of verbal messages, causing the individual to remain in an unnecessarily high attention span, which can have negative health effects such as fatigue and stress. The long reverberation time in turn causes loss of speech intelligibility, i.e. verbal messages are partially understood or sometimes confused
- PublicaciónAcceso abiertoEvaluación de la influencia de las condiciones acústicas de las aulas en tres ciudades del país en el rendimiento docente y estudiantil(2018) Rodríguez González, Mauricio; Ochoa Villegas, JonathanThis project seeks to evaluate the acoustic conditions of the classrooms located in three cities of the country (Medellin, Bogota and Cali) to determine the acoustic impact they have on the teaching-learning process, the health of the teachers and the student’s cognitive performance. The next job is part of the macro project " Identification of factors of environmental performance (acoustic, thermal and visual) determinants of the mental health of teachers and students of public schools of Bogota, Medellin and Cali: Line bases for the analysis of impact of the public politics according to the norm NTC 4595 " conducted by COLCIENCIAS. To execute this project measurements of background noise, time of reverberation and acoustic isolation were realized in the selected classrooms, and there were obtained results that do not fulfill with the regulations, which makes necessary the development of a process of management of noise to control the acoustic problems that they present in the classrooms of the different schools studied. Keywords: Cognitive process, Background noise, Reverberation time, Acoustic isolation, Acoustic conditioning.
- PublicaciónAcceso abiertoIncidencia del porcentaje de abertura de las ventanas en la ventilación natural y el ruido de fondo en tres tipos diferentes de aulas de básica primaria en Medellín, Colombia(2019) Arredondo Rincón, José Luis; Giraldo Vásquez, NataliaThis study was made in Colombia, a country located in the intertropical convergence zone, characterized by warm and humid winds, coming from the northern and southern latitudes. Colombia’s weather, despite being highly torrid, due to the perpendicularity of the sun’s rays, has a large number of thermal floors that make the climate fluctuate, due to its location near the Andes Mountain Arange. This study was developed specifically in the city of Medellín, located at 6.25° of the northern latitude he study was developed specifically in the city of Medellín, located at 6.25° of the northern latitude, with an average height of 1495 meters above sea level and with a hot sub-Andean humid climate (Narváez-Bravo & León-Aristizábal, 2001). These are important characteristics that should be taken into consideration for the measurement of the environment in the primary school classrooms considered in this study. 3 types of primary school classrooms were evaluated in the city of Medellín for this study: 1) square; 2) rectangular with openings on wide side; and 3) rectangular with openings on its short side. The names of these last two are rectangular and deep rectangular, respectively, which must comply with the Colombian Technical Standard (NTC) 4595 (Colombian Institute of Technical Standards and Certification [ICONTEC] & Colombia, Ministry of National Education, 2015). Five aperture percentages were evaluated with respect to the span's total area: 20%, 40%, 60%, 80% and 100% in three proportion types referencing its dimensions: 1:2, 1:3, and 2:3. Given 15 different cases of spans evaluated, the aperture at a 100% complies with the entrance suggested in NTC 4595 (2006). It's also the only one that adjusts with the proportions. Under NTC 4595 2015, updated from 2006, Medellin's weather doesn't fit into mild category, because its temperature ranges from 18 to a 24 °C. Neither does it fit into the warm-humid category because its humidity ranges are above 75%. Nevertheless, this inconvenient was resolved by using 1/6 of the space’s area, which is the suggested area for venting, according to NTC 4595 norm of 2006 (Instituto Colombiano de Normas Técnicas y Certificación [ICONTEC] & Colombia. Ministerio de Educación Nacional), which adjusted better to Medellin’s climate. Two models were made: 1) with the help of Autodesk CFD software (Computational Fluid Dynamics), in terms of wind; and 2) with the TL (Tansmission Loss) combined, in terms of noise. The wind and noise evaluations in the different combinations of classroom and percentage of window opening, show that: the three different classroom forms have no relationship with the ventilated area nor with the degrees of attenuation; the proportion of the span is not related to attenuation levels; and, the proportion that has greater simultaneous effects is 2: 3, with 40% opening in the square classroom