It is commonly believed that near-field head-related transfer functions (HRTFs) provide perceptual benefits over far-field HRTFs that enhance the plausibility of binaural rendering of nearby sound sources. However, to the best of our knowledge, no study has systematically investigated whether using near-field HRTFs actually provides a perceptually more plausible virtual acoustic environment. To assess this question, we conducted two experiments in a six-degrees-of-freedom multimodal augmented reality experience where participants had to compare non-individual anechoic binaural renderings based on either synthesized near-field HRTFs or intensity-scaled far-field HRTFs and judge which of the two rendering methods led to a more plausible representation. Participants controlled the virtual sound source position by moving a small handheld loudspeaker along a prescribed trajectory laterally and frontally near the head, which provided visual and proprioceptive cues in addition to the auditory cues. The results of both experiments show no evidence that near-field cues enhance the plausibility of non-individual binaural rendering of nearby anechoic sound sources in a dynamic multimodal virtual acoustic scene as examined in this study. These findings suggest that, at least in terms of plausibility, the additional effort of including near-field cues in binaural rendering may not always be worthwhile for virtual or augmented reality applications.
Las funciones criptográficas Hash convierten un mensaje de longitud variable en un “resumen del mensaje”, y son usadas para aplicaciones de firma digital, códigos de autenticación de mensajes y otras aplicaciones para seguridad informática. Recientes ataques realizados al estándar SHA-1 han sido publicados, por lo tanto, el National Institute for Standards and Technology (NIST) realizó una convocatoria pública para seleccionar el algoritmo SHA-3 para el nuevo estándar. Como resultado, entre los cinco algoritmos finalistas: Blake, Grøstl, JH, Keccak y Skein, el seleccionado fue Keccak. En este trabajo se implementaron en hardware los cinco algoritmos finalistas usando arquitecturas pipeline para las diferentes rondas del proceso iterativo. Las arquitecturas hardware fueron simuladas y sintetizadas usando Modelsim-Altera y Quartus II v.11.2, respectivamente. Los resultados de síntesis muestran que existen alternativas para ser usadas como IP cores en aplicaciones criptográficas embebidas en un SoC.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.