This paper presents a new approach which acoustically localizes a mobile target outside the Field-of-View (FOV), or the Non-Field-of-View (NFOV), of an optical sensor, and its implementation to complex indoor environments. In this approach, microphones are fixed sparsely in the indoor environment of concern. In a prior process, the Interaural Level Difference (ILD) of observations acquired by e...

The sound is widely used in marine observatories as an alternative means to retrieve information about environmental data in the sea area under surveillance. The original idea of using specifically man-made sound sources to send signals in the marine environment triggered the idea of ocean acoustic tomography and many alternative methods have been developed to exploit the acoustic measurements ...

The scientific objective of this research is to understand acoustic wave propagation in a dynamic environment in two frequency bands: Low (50 Hz to 500 Hz) and Mid-to-High (500 Hz to 25 kHz). The goal for the low frequency band is to assess the effects of internal waves on acoustic wave propagation, with an emphasis on the mechanisms that cause significant acoustic temporal and spatial intensit...

The Stereoscopic Haptic Acoustic Real-Time Computer (SHARC) is a multi-sensory computer system which integrates technologies for autostereoscopic display, acoustic sensing and rendering, and haptic interfaces into the same computing environment. This paper describes the system organization and the interface between diierent sensory components. This paper also discusses our ndings from developin...

Slightly more than 10 years ago the Woods Hole Oceanographic Institution and Northeastern University published a new algorithm for multi-channel adaptive equalization along with results of using that algorithm to successfully decode long-range, high-rate, acoustic communication transmissions. In the years since the authors have built on this foundation to improve and adapt the core algorithm fo...

1 Launch loads, both mechanical and acoustic, are the prime driver of spacecraft structural design. Passive approaches for acoustic attenuation are limited in their low frequency effectiveness by constraints on total fairing mass and payload volume constraints. Active control offers an attractive approach for low frequency acoustic noise attenuation inside the payload fairing. Smart materials s...

This paper describes a system used in acoustic event detection task of the CLEAR2007 evaluation. The objective of the task is to detect acoustic events (door slam, steps, paper wrapping etc.) using acoustic data from a multiple microphone set up in the meeting room environment. A system based on hidden Markov models and multichannel audio data was implemented. Mel-Frequency Cepstral Coe cients ...

The scientific objective of this research is to understand acoustic wave propagation in a dynamic environment in two frequency bands: Low (50 Hz to 500 Hz) and Mid-to-High (500 Hz to 50 kHz). The goal for the low frequency band is to assess the effects of internal waves on acoustic wave propagation, with an emphasis on the mechanisms that cause significant temporal and spatial acoustic fluctuat...

Expressions governing coherence scales of sound passing through a moving packet of nonlinear internal waves in a continental shelf environment are presented. The expressions describe the temporal coherence scale at a point, and the horizontal coherence scale in a plane transverse to the acoustic path, respectively. Factors in the expressions are the wave packet propagation speed, wave packet pr...

ABSTRACT We report results of an auditory navigation experiment. In auditory navigation sound is employed as a navigational aid in a virtual environment. In our experiment, the test task was to find a sound source in a dynamic virtual acoustic environment. In dynamic auralization the movements of the subject are taken into account in acoustic modeling of the room. We tested the effect of three ...