Linearized Direction of Arrival

Linearized Direction of Arrival (LinDoA) is a method for sound source localization that is designed for use with wearable microphone arrays. The method uses a Taylor series expansion of the sound source signal in the time domain to beamform and estimate the direction of arrival. The original method is limited to spatial sampling, but is here generalized to also consider temporal sampling for improved performance and usability. The proposed generalization allows for time-domain formulations of the Delay-and-Sum and Minimum-Variance Distortionless Response beamformers in addition to the original formulation by implementing interpolation and estimating the noise covariance. A number of variants of the method are described and the design choices are discussed. The methods are evaluated on data gathered by a head-worn array in real and simulated experiments and are compared to conventional methods. They are shown to perform on par with conventional methods at a reduced computational cost.