Time-domain acoustic contrast control method using loudspeaker array has been studied for generating bright and dark zones in personal audio system. Acoustic contrast which is defined as the acoustic energy ratio between bright and dark zones can be inevitably influenced by the uncertainties in the frequency response of loudspeakers. In this paper, a robust extension of broadband acoustic contr...

This chapter describes the design and implementation of a Smart Acoustic Sensor Array (SASA) System consists of a 52 microphone MEMS array embedded in an FPGA (Field Programmable Gate Array) platform with real-time data acquisition, signal processing, and network communication capabilities. The SASA system is evaluated using several case studies in order to demonstrate the versatility and scala...

Given the increasing interest in the effects of sound on marine mammals, a new modelbased algorithm for localizing transient noises around a sparse, widely-distributed array of receivers has been developed and tested with real acoustic data. The robustness of the algorithm is illustrated in its application to two different scenarios with equal success: localizing humpback whales near Hawaii and...

A one dimensional system made up of a compressible fluid and several mechanical oscillators, coupled to the acoustic field in the fluid, is analyzed for different settings of the oscillators array. The dynamical models are formulated in terms of singular perturbations of the decou-pled dynamics of the acoustic field and the mechanical oscillators. Detailed spectral properties of the generators ...

Acoustic array sensor along with Root-MUSIC algorithm is used to estimate the direction of arrival of the acoustic signal emitted by an acoustic target. Three architectures are used to track the target in Cartesian coordinates: (i) digital filter with least square estimation, (ii) linear Kalman filter with least square estimation, and (iii) extended Kalman filter. A comparative evaluation of th...

Phase aberration due to tissues with inhomogeneous acoustic speeds is a major source for image degradation in medical ultrasound. In most phased array pulse-echo ultrasound systems, the delay used to steer and focus the beams are calculated assuming constant speed. In practice, however, the acoustic speed varies for different types of tissue. In this paper, we present a method to estimate the p...