Anders M. Johansson

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In noisy and reverberant environments, the problem of acoustic source localisation and tracking (ASLT) using an array of microphones presents a number of challenging difficulties. One of the main issues when considering real-world situations involving human speakers is the temporally discontinuous nature of speech signals: the presence of silence gaps in(More)
— In noisy and reverberant environments, the problem of acoustic source localisation and tracking (ASLT) using an array of microphones presents a number of challenging difficulties. One of the main issues when considering real-world situations involving human speakers is the temporally discontinuous nature of speech signals: the presence of silence gaps in(More)
— In many research fields of engineering and acous-tics, the image-source model represents one of the most popular tools for the simulation of sound fields in virtual reverberant environments. This can be seen as a result from the relative simplicity and flexibility of this particular method. However, the associated computational costs constitute a well(More)
The problem of acoustic source localization and tracking (ASLT) in reverberant environments by means of a microphone array constitutes a challenging task from many viewpoints. One of the main issues when considering real-world situations involving human speakers is the presence of silence gaps in the speech, which can easily send the tracking algorithm(More)
Wideband robust direction of arrival estimation using microphone arrays is associated with computationally complex algorithms, unsuitable for implementation on low power devices. This paper improves on the computational complexity by devising an algorithm based on steered response interpolation combined with steered response power estimation employing root(More)
The image-source method has become a ubiquitous tool in many fields of acoustics and signal processing. A technique was recently proposed to predict the energy decay (energy–time curve) in room impulse responses simulated using the image-source model. The present paper demonstrates how this technique can be efficiently used to determine the enclosure's(More)
—This article describes a new method for the online parameter optimization of various models used to represent the target dynamics in particle filters. The optimization is performed with an evolutionary strategy algorithm, by using the performance of the particle filter as a basis for the objective function. Two different approaches of forming the objective(More)
Methods for acoustic speaker tracking attempt to localize and track the position of a sound source in a reverberant environment using the data received at an array of microphones. This problem has received significant attention over the last few years, with methods based on a particle filtering principle perhaps representing one of the most promising(More)
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