Julián Villegas

Learn 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)
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)
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)
> Figure 1: PoI Poi: Point-of-interest poi panning projected panoramas, mixed reality scenes (as in Figure 2 below), and spatial sound for multimodal tethered whirling— locative media for multimodal, cross-platform, " mobile ambient " experience. Abstract We have built haptic interfaces featuring smartphones and tablets that use magnetometer-derived(More)
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)
A real-time system for sound spatialization via headphones is presented. Conventional headphone spatialization techniques effectively place sources on the surface of a virtual sphere around the listener. In the new system, sources can be spatialized at different distances from a listener by interpolating head-related impulse responses (HRIRs) measured(More)
Contemporary smartphones and tablets have magnetometers that can be used to detect yaw, which data can be distributed to adjust ambient media. We have built haptic interfaces featuring smartphones and tablets that use compass-derived orientation sensing to modulate virtual displays. Embedding mobile devices into pointing, swinging, and flailing affordances(More)
We have built haptic interfaces featuring smartphones and tablets that use magnetometerderived orientation sensing to modulate virtual displays, especially spatial sound, allowing, for instance, each side of a karaoke recording to be separately steered around a periphonic display. Embedding such devices into a spinnable affordance allows a "spinning plate"-(More)
MTRANS, a freely available tool for annotating multi-channel speech is presented. This software tool is designed to provide visual and aural display flexibility required for transcribing multi-party conversations; in particular, it eases the analysis of speech overlaps by overlaying waveforms and spectrograms (with controllable transparency), and the(More)