Journal ArticleDOI
Technique for broadband correlated interference rejection in microphone arrays
TLDR
Frequency-invariant beam-forming is used to perform frequency domain averaging, thereby reducing the correlation between the desired signal and the interference, and is useful for hands-free speech acquisition using a microphone array.Citations
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Journal ArticleDOI
Design of Robust Superdirective Arrays With a Tunable Tradeoff Between Directivity and Frequency-Invariance
Marco Crocco,Andrea Trucco +1 more
TL;DR: A new method of array synthesis is proposed that allows the design of a robust broadband beamformer with tunable tradeoff between frequency-invariance and directivity, without the need for imposing a desired beam pattern.
Journal ArticleDOI
Surrounded by sound
TL;DR: The authors discuss immersive audio systems and the signal processing issues that pertain to the acquisition and subsequent rendering of 3D sound fields over loudspeakers and the commercial implications of audio DSP.
Journal ArticleDOI
A stochastic approach to the synthesis of a robust frequency-invariant filter-and-sum beamformer
TL;DR: A method to design a robust broadband beamformer that produces an FIBP for a data-independent superdirective array is proposed and compared with other potential approaches and generates a far-field beam pattern that reproduces the desired profile over a very wide frequency band.
Patent
Microphone array method and system, and speech recognition method and system using the same
TL;DR: In this paper, a microphone array system including an input unit to receive sound signals using a plurality of microphones, a frequency splitter splitting each sound signal received into a multiplicative set of narrowband signals, and an average spatial covariance matrix estimator using spatial smoothing is presented.
DissertationDOI
Modal Analysis and Synthesis of Broadband Nearfield Beamforming Arrays
TL;DR: A formulation of a set of analysis tools which can provide insight into the intrinsic structure of array processing problems, a methodology for near eld beamforming; theory and design of a general broadband beamformer; and a consideration of a coherent near eld broadband adaptive beamforming problem are presented.
References
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Journal ArticleDOI
Adaptive beamforming for coherent signals and interference
Tie-Jun Shan,Thomas Kailath +1 more
TL;DR: A new adaptive array beam-former able to work well even when the desired signal and the interference are coherent, and the results of simulations support the theoretical predictions.
Journal ArticleDOI
Signal cancellation phenomena in adaptive antennas: Causes and cures
TL;DR: Conventional adaptive beamformers utilizing some form of automatic minimization of mean square error exhibit signal cancellation phenomena when adapting rapidly, and Widrow has devised a different solution to the problem: to move the receiving array spatially to modulate emanations received off the look direction, without distorting useful signals incident from theLook direction.
Journal ArticleDOI
Theory and design of broadband sensor arrays with frequency invariant far‐field beam patterns
TL;DR: In this paper, the theory and design of a broadband array of sensors with a frequency invariant far-field beam pattern over an arbitrarily wide design bandwidth is presented, and the problem of designing a practical sensor array is treated as an approximation to this continuous sensor using a discrete set of filtered broadband omnidirectional array elements.
Journal ArticleDOI
FIR filter design for frequency invariant beamformers
TL;DR: Two methods of implementing FIR filters for a frequency invariant beamformer are presented and one method uses multirate processing, and the other is based on a single sampling rate.
Proceedings ArticleDOI
Frequency-independent beamformer with low response error
TL;DR: A method is developed for designing broadband beamformers with highly frequency-invariant behavior, yielding systems with efficient log-periodic transducer structures and plane wave responses which deviate from the desired response by less than 1% of the peak mainlobe response.
Related Papers (5)
Interpolated array minimum variance beamforming for correlated interference rejection
A. Zeira,Benjamin Friedlander +1 more