Julián Villegas

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HRIR~, a new software audio filter for Head-Related Impulse Response (HRIR) convolution is presented. The filter, implemented as a Pure-Data object, allows dynamic modification of a sound source's apparent location by modulating its virtual azimuth, elevation, and range in realtime, the last attribute being missing in surveyed similar applications. With(More)
We investigated the effect on objective speech intelligibility of scaling the fundamental frequency (f0) of voiced regions in a set of utterances. The frequency scaling was driven by max-imising the glimpse proportion in voiced epochs, inspired by musical consonance maximisation techniques. Results show that depending on the energetic masker and the signal(More)
How does a background conversation affect a foreground con-versation? In this scenario, and unlike traditional studies of noise-induced speech modification (Lombard speech), listeners have to cope with the additional challenge of competing speech material. In the current study, pairs of talkers engaged in natural dialogs in the absence or presence of(More)
Interactive table-top interfaces are multimedia devices which allow sharing information visually and aurally among several users. Table-top interfaces for spatial sound environments are frequently investigated in the field of the human interfaces. Table-top interfaces are utilized as groupware and it is suitable for collaborative work, and it is convenient(More)
Modern smartphones and tablets have magnetometers that can be used to detect yaw, which data can be distributed to adjust ambient media. Either static (pointing) or dynamic (twirling) modes can be used to modulate multimodal displays, including 360° imagery and virtual environments. Azimuthal tracking especially allows control of horizontal planar(More)
Speech produced in the presence of noise (Lombard speech) is typically more intelligible than speech produced in quiet (plain speech) when presented at the same signal-to-noise ratio, but the factors responsible for the Lombard intelligibility benefit remain poorly understood. Previous studies have demonstrated a clear effect of spectral differences between(More)
In traditional conferencing systems, participants have little or no privacy, as their voices are by default shared with all others in a session. Such systems cannot offer participants the options of muting and deafening other members. The concept of narrowcasting can be applied to make these kinds of filters available in multimedia conferencing systems. Our(More)
A working prototype for alternative visualizations of environmental data (currently, ionizing radiation) measured with bGeigie nano Safecast sensors is presented. Contrary to previous interfaces, in this visualization users have finer control of the displayed data (i.e., can determine date ranges, compare locations, decide the averaging areas, etc.) and(More)
The rapid advances in the technology and science of presenting spatial sound in virtual, augmented, and mixed-reality environments seem to be underrepresented in recent literature. The goal of this special issue of the Virtual Reality Journal is twofold: to provide a state-of-the-art review of progress in spatial sound as applied to virtual reality (VR) and(More)