Examinando por Materia "Sonido envolvente"
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- PublicaciónAcceso abiertoAnálisis de algoritmos de decodificación de sistemas ambisonics incluyendo corrección de campo cercano(2019) Ardila Arredondo, Alejandro; Villegas Echeverri, Daniela; Murillo Gómez, Diego MauricioAmbisonic is a three-dimensional reproduction system which has been widely used for more than four decades. Its wide use is due to the robust reconstruction of the sound field that allows the generation of immersive environments. This thesis presents the evaluation of different methodologies for 3 cases of decoding based on different types of propagation and sound sources. Where the near field is included The analysis of these models contemplate the amount of energy required by the system for the reconstruction of the sound field, errors with respect to the theoretical sound field as: amplitude error, normalized amplitude error and phase error. Finally, the analysis of the near-field filters in the time and frequency domain is performed. The numerical simulations show that it is indeed possible to compensate the effect of near field produced by the monopoles at the expense of a great energy generated by the system
- PublicaciónAcceso abiertoComparación objetiva y subjetiva de la sonoridad entre una mezcla de sonido envolvente 5.1 y binaural de un cortometraje usando el sistema de reproducción Opsodis(2017) Restrepo Cabanzo, Liliam Patricia; Lopera Gómez, SebastiánThis project intends to evaluate and compare the loudness in an objective and subjective way in a short film between de sound mix developed for surround sound 5.1 and binaural. For this purpose, it was proposed to measure loudness in the short film according to the Recommendation ITU-R BS. 1770-4 that specifies the algorithms to measure multichannel audio program loudness and compare these results with subjective tests in individuals with knowledge in audiovisual area. From this comparison, we sought to determine if the subjects can identify loudness changes between different audio samples of the short film when played through the Opsodis sound reproduction system. The objective comparison between the algorithm used in this project and the loudness measurement plugin, showed differences between -2 and -3 loudness units in both measurement methods, whereas in the objective comparison between the 5.1 sound mix 5.1 and the binaural sound mix – using the algorithm -, differences of approximately 1 loudness unit were observed. Subjective tests showed results where loudness changes, in 5.1 sound mix and binaural sound mix, are perceived by individuals from 2 loudness units above and below a reference loudness level.
- PublicaciónAcceso abiertoDiseño de altavoces para reproducción de audio binaural en baja frecuencia basado en sistema OPSODIS(2019) Jaramillo Restrepo, Cristian; Pérez Bustamante, César Augustois carried out the design and construction of a low frequency reinforcement for the “Sherwood S7” OPSODIS system, wich guarantees an increase in the reproduction range, it prevents negative changes in the system spatialization and it gives a high quality design thanks to the correct characterization of the speakers using the "Thielle-Small" Parameters, obtaining an aesthetic and funtional system. All the required measurements were specially done to guarantee the correct operation of the reinforcement system. The system was created combining binaural techniques and multi-chanel reproduction, obtaining 3D audio using the OPSODIS system and the low frequency reinforcement with two surround speakers. It is provided a datasheet document that shows all the physical characteristics of the system and the design parameters. The system's design is archieved by a methodology of three stages: characterization, design and construction, and measurements. Finally, we obtain a low frequency reinforcement system with two speakers that can help the OPSODIS system to play 3D audio with a frequency range since 53 Hz to 16 kHz.