2014 We study the hydrodynamics of a fluid supporting an intense and anisotropic acoustic noise. We show that new hydrodynamic modes, with partly transverse polarisation, may exist in such a fluid provided that the intensity and anisotropy of the acoustic noise are sufficiently high. Tome 36 No 9 Septembre 1975 Classification Physics Abstracts 6.305

Acoustic intensity change, along with interaural, spectral, and reverberation information, is an important cue for the perception of auditory motion. Approaching sound sources produce increases in intensity, and receding sound sources produce corresponding decreases. Human listeners typically overestimate increasing compared to equivalent decreasing sound intensity and underestimate the time to...

Listeners often overestimate the acoustic intensity change of rising compared to equivalent falling intensity tones. The explanation that has been proposed for this effect has centered on the importance of a rising intensity signal in a natural environment. From the perspective of auditory display, this perceptual asymmetry makes acoustic intensity a poor variable choice for the purpose of soni...

When focusing ultrasound through strongly aberrating layers such as bones, adaptive focusing techniques need to be used. They aim at recovering the delays to be applied to each emission channel of the ultrasonic (US) therapeutic array in order to compensate the phase shifts induced by the aberrator. We recently proposed a new energy-based technique requiring the sole knowledge of the acoustic i...

The majority of previous studies on vocal expression have been conducted on posed expressions. In contrast, we utilized a large corpus of authentic affective speech recorded from real-life voice controlled telephone services. Listeners rated a selection of 200 utterances from this corpus with regard to level of perceived irritation, resignation, neutrality, and emotion intensity. The selected u...

Fluctuations of the low frequency sound field in the presence of an internal solitary wave packet during the Shallow Water '06 experiment are analyzed. Acoustic, environmental, and on-board ship radar image data were collected simultaneously before, during, and after a strong internal solitary wave packet passed through the acoustic track. Preliminary analysis of the acoustic wave temporal inte...

The applications are to Cymbal and Tonpilz transducer arrays for 3 50 kHz sonars, thin/thick film transducers for 10 100 MHz medical acoustic devices, underwater intensity sensors for lowfrequency surveillance, and flexural amplification mechanisms of the solid state strain for air acoustic transduction. Modeling and computer simulations of domain motions and structural vibrations and supportin...

Toothed whales use sonar to detect, locate, and track prey. They adjust emitted sound intensity, auditory sensitivity and click rate to target range, and terminate prey pursuits with high-repetition-rate, low-intensity buzzes. However, their narrow acoustic field of view (FOV) is considered stable throughout target approach, which could facilitate prey escape at close-range. Here, we show that,...

Abstract: Wide area acoustic remote sensing often involves the use of coherent receiver arrays to determine the spatial distribution of sources and scatterers at any instant. The resulting acoustic intensity images are typically corrupted by signal-dependent noise from Gaussian random field fluctuations arising from the central limit theorem and have a spatial resolution that depends on the inc...

The present study attempted to investigate the acoustic characteristics of Mandarin laryngeal and esophageal speech. Eight normal laryngeal and seven esophageal speakers participated in the acoustic experiments. Results from acoustic analyses of syllables /ma/and /ba/ indicated that, F0, intensity, and signal-to-noise ratio of laryngeal speech were significantly higher than those of esophageal ...