#### Filter Results:

- Full text PDF available (10)

#### Publication Year

2005

2010

- This year (0)
- Last 5 years (0)
- Last 10 years (7)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- Eric A Lehmann, Anders M Johansson
- The Journal of the Acoustical Society of America
- 2008

A method is proposed that provides an approximation of the acoustic energy decay (energy-time curve) in room impulse responses generated using the image-source technique. A geometrical analysis of the image-source principle leads to a closed-form expression describing the energy decay curve, with the resulting formula being valid for a uniform as well as… (More)

- Eric A. Lehmann, Anders M. Johansson
- EURASIP J. Adv. Sig. Proc.
- 2007

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)

- Eric A. Lehmann, Anders M. Johansson
- IEEE Transactions on Audio, Speech, and Language…
- 2010

In many research fields of engineering and acoustics, 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 known… (More)

This paper describes a robust algorithm for sound source localization in conference rooms. The method used is a modified steered response power phase alignment transform algorithm. The results are obtained by processing real data recorded in a typical conference room, and they are compared to data obtained from a simple free-field model. The algorithm… (More)

- Eric A. Lehmann, Anders M. Johansson, Sven Nordholm
- 2007 IEEE Workshop on Applications of Signal…
- 2007

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)

- Eric A. Lehmann, Anders M. Johansson, Sven Nordholm
- 2007 IEEE Workshop on Applications of Signal…
- 2007

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)

- Anders M. Johansson, Eric A. Lehmann, Sven Nordholm
- APCCAS
- 2006

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)

- Anders M. Johansson, Eric A. Lehmann
- IEEE Trans. Evolutionary Computation
- 2009

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)

- Anders M. Johansson, Sven Nordholm
- ICASSP
- 2005

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)

2

- ‹
- 1
- ›