A novel statistical scheme is presented for the classification of shallow water acoustic signals according to the environmental parameters of the medium through which they have propagated. An efficient way to classify these signals is important for inverse procedures in underwater acoustics aiming at the recovery of the geoacoustic parameters of an oceanic environment, using measurements of the...

Techniques for measuring and estimating the end-to-end latency and component latencies of a virtual acoustic environment are discussed. These key parameters impact the responsiveness and, hence, “realism” of a virtual environment.

It is unclear whether top-down processing in the auditory cortex (AC) interferes with its bottom-up analysis of sound. Recent studies indicated non-acoustic modulations of AC responses, and that attention changes a neuron's spectrotemporal tuning. As a result, the AC would seem ill-suited to represent a stable acoustic environment, which is deemed crucial for auditory perception. To assess whet...

Advances in wireless networking and sensor network design open new prospective in performing demanding collaborative sensing and signal processing. This project was motivated by the ambitious plan of designing and implementing acoustic applications in low-cost distributed wireless sensor networks. As first step, we considered the problem of acoustic localization through a set of distributed sen...

biophysical profile (bpp) test is the most commonly used antenatal test of fetal well-being. purpose of this study is determining the influence of acoustic stimulation (as) on bpp testing time. about 55 pregnant women at 35 to 42 weeks who referred to department of obstetric & gynecology at university of medical sciences, tabriz, iran, were selected randomly. we used abdominal ultrasound guidan...

The presence of babble noise is one of the most difficult environments to sustain speech system performance. This study focuses on acoustic and perceptual analyses of babble. The acoustic variability of babble is analyzed as a function of the number of speakers in babble. The concept of acoustic volume is proposed and it is shown that the acoustic volume reduces as the number of speakers in bab...

Abstract. In Magnetic Resonance Imaging (MRI) room, strong acoustic noise during the scan not only creates harmfully annoying environment but also interferes with brain activation response. The presence of reverberation in the MRI environment interferes with efficient noise canceling techniques. In this paper, we present a blind dereverberation method for estimating the broadband MRI acoustic n...

This paper proposes an innovative concept that responds to the requirements of acoustic REA as the integration between a network of sophisticated Acoustic-Oceanographic Buoys (AOB) and online ocean properties inversion algorithms. A prototype of the system, including one sonobuoy and a preliminary version of the inversion code, was tested at sea during the MREA’03 sea trial. The AOB is a light ...