Sound Field Synthesis Toolbox 1.0.0-beta2 released

Posted on 5. December 2013 by Hagen Wierstorf

A new bug fix release of the SFS Toolbox was released today.
You can download the latest release and you should have a look at the tutorial on github how to use it.

sfs-1.0.0-beta2

NEWS:
- rms() now works for arbitrary arrays
- speedup of delayline() and HRTF extrapolation
- delayline() now works with more than one channel
- fixed a critical bug in wfs_preequalization()
- fixed missing conf values in several functions
- fixed README
- changed location of sfs-data for automatic download, because github does
not allow this
- several minor fixes

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Article: The Synthesis of Sound Figures

Posted on 25. November 2013 by Sascha Spors

The article The Synthesis of Sound Figures published by Karim Helwani, Sascha Spors and Herbert Buchner in the Journal Multidimensional Systems and Signal Processing discusses the synthesis of sound fields within a predefined region in space. The problem is formulated by separating the sound field into regions with high acoustic level, so-called bright regions, and zones with low acoustic level (zones of quiet) by time independent virtual boundaries. An analytic solution to the problem is developed and its application using established sound field synthesis techniques is shown including an analysis of practical limitations.

sound_figure

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Paper: Is Sound Field Control Determined at all Frequencies? How is it Related to Numerical Acoustics?

Posted on 11. October 2013 by Sascha Spors

The paper Is Sound Field Control Determined at all Frequencies? How is it Related to Numerical Acoustics? published by Franz Zotter and Sascha Spors at the 52nd International Conference of the Audio Engineering Society reviews the physical foundations of Sound Field Synthesis. The presentation given by Sascha Spors can be viewed here.

The paper shows how synthesis can be achieved using the equivalent scattering approach and the inherent problem of non-uniqueness is discussed. It is furthermore highlighted that the problem of synthesizing a sound field is directly related to the Boundary Element Method (BEM) used in numerical acoustics. It is finally derived that Wave Field Synthesis (WFS) can be interpreted as high-frequency approximation of the exact solution.

equivalent_scattering

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Paper: Data-based Binaural Synthesis Including Rotational and Translatory Head-Movements

Posted on 18. September 2013 by Frank Schultz

Feel free to download the poster Schultz_2013_TranslatoryMotions_AES52ndIntl_Poster_Final to our paper contribution of the recent 52nd Audio Engineering Society Conference on Sound Field Control – Engineering and Perception, Guildford, UK, September 2-4, 2013 AES52nd_Conf_P_MB_Discrete_Shift_Poster

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Article: Spatial Sound with Loudspeakers and its Perception: A review of the current state

Posted on 11. September 2013 by Sascha Spors

spors2013_ieee_review

In the last Proceedings of the IEEE S. Spors, H. Wierstorf, A. Raake, F. Melchior, M. Frank and F. Zotter published a review about the current state of spatial audio reproduction and its perception.

Here we are adding supplementary material like Matlab scripts to create figures from the paper and some listening examples for Wave Field Synthesis and near-field compensated higher order Ambisonics.

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Paper: A Virtual Endfire Loudspeaker Array for the Generation of Sound Beams

Posted on 22. August 2013 by Sascha Spors

The paper A Virtual Endfire Loudspeaker Array for the Generation of Sound Beams presented by Sascha Spors and Hagen Wiersorf at the AIA-DAGA Conference on Acoustics considers the synthesis of sound fields that are limited to a linear region in space. Loudspeaker arrays used in endfire configuration are known to produce good results in this context. In this paper the use of a virtual endfire array is considered, which itself is synthesized by a broadside loudspeaker array using focused sources in Wave Field Synthesis.

DAGA2013_SF_virtual_endfire_1kHzDAGA2013_SFL_virtual_endfire_1kHz

The presentation slides as well as the MATLAB/Octave script to generate the figures are available. The script requires to download the Sound Field Synthesis toolbox.

 

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The Technology of Binaural Listening

Posted on 15. July 2013 by Hagen Wierstorf

We are happy to announce a new book on spatial audio:
The Technology of Binaural Listening, edited by Jens Blauert.
The Technology of Binaural Listening

The book was created in a collaboration within the research initiative “Aural Assessment by Means of Binaural Algorithm” (AABBA). From our labs it includes the chapters:

Another highlight is that all the binaural auditory models applied in the book are freely available in the latest version of the The Auditory Modelling Toolbox.

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The APF repository is online!

Posted on 4. July 2013 by matthias.geier

Yesterday we uploaded all the code of the Audio Processing Framework (APF) to its new home at http://AudioProcessingFramework.github.io/.

So if you need some C++ code, have a look there!

It offers a multi-threaded realtime environment for multichannel applications, a (uniformly) partitioned convolution engine, IIR second order filters (and cascades thereof), a block-based delay line, a C++ wrapper for the JACK Audio Connection Kit, some tools to use the FFTW in C++ and many more things.

Documentation is available at http://AudioProcessingFramework.github.io/apf-doc.

Have a look, try it out and leave feedback at http://github.com/AudioProcessingFramework/apf!

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Article: Spatial perception of sound fields recorded by spherical microphone arrays with varying spatial resolution

Posted on 17. May 2013 by Sascha Spors

This article presents an experimental study of spatial sound perception with the use of a spherical microphone array for sound recording and headphone-based binaural sound synthesis. Sound field analysis and processing is performed in the spherical harmonics domain with the use of head-related transfer functions and simulated enclosed sound fields. The effect of several factors, such as spherical harmonics order, frequency bandwidth, and spatial sampling, are investigated by applying the repertory grid technique to the results of the experiment, forming a clearer relation between sound-field capture with a spherical microphone array and its perception using binaural synthesis regarding space, frequency, and additional artifacts.

Amir Avni, Hagen Wierstorf, Matthias Geier, Jens Ahrens, Sascha Spors, and Boaz Rafaely. Spatial perception of sound fields recorded by spherical microphone arrays with varying spatial resolution. Journal of the Acoustical Society of America (JASA), 133(5):2711–2721, May 2013.

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CfP: EAA Joint Symposium on Auralization and Ambisonics

Posted on 19. April 2013 by Sascha Spors

Integrating the 2nd International Auralization Symposium, and the
5th International Symposium on Ambisonics and Spherical Acoustics

Invitation and Call for Papers
The EAA Joint Symposium on Auralization and Ambisonics will be held on 3–5 April, 2014 in Berlin, hosted by the Audio Communication Group/TU Berlin in cooperation with the Federal Institute for Music Research (SIMPK) and the SEACEN Consortium for the Simulation and Evaluation of Acoustic Environments (www.seacen.tu-berlin.de).

This single-track conference will feature keynote addresses, oral presentations and posters. Topic of this event is auralization (i.e. making acoustic modeling and measurement results audible) and spherical and non-spherical approaches to sound field analysis and synthesis. Original submissions in all areas related to auralization and spatial sound field reproduction are invited. The possible topics include, but are not limited to the following:

Spherical (Ambisonic) and non-spherical approaches to sound field simulation:

  • General theoretical considerations
  •  Efficient numerical simulation
  • Measurement/Recording/Analysis
  • Signal processing
  • Auditory analysis, perceptual encoding
  • Representation, coding, standardization

Auralization:

  • Room acoustical simulation and auralization
  • Headphone and loudspeaker based reproduction
  • Applications and case studies
  • Perceptual evaluation
  • Algorithmic modelling and implementation

Submissions and Schedule
The symposium will have full-paper peer-review. The maximum length of a submission is six pages.
Abstract submission (250 words)                    01.08.2013
Notification of acceptance                                 01.09.2013
Full paper submission                                        01.12.2013
Early bird participant registration                  01.01.2014
Review results published                                   15.01.2014
Revised paper submission                                15.02.2014
Registration Deadline (online)                        01.03.2014
Symposium                                                         03.–05.2014

Conference Fees (incl. Banquet, Lunch, Coffee)
Regular                                                                            350 €
Student                                                                            250 €
Early Bird Discount                                                        50 €
EAA Member Discount                                                  25 €

Publication
Contributions that are accepted after revision will enter the proceedings. Proceedings will be published electronically (including ISBN and DOI per contribution). Ten selected papers will be published in a special issue of “Acta Acustica united with Acustica”.

Information, Submission, Registration
All information related to the event and the submission procedure will be available from www.auralization.tu-berlin.de.

Conference chairs
Prof. Dr. Stefan Weinzierl, TU Berlin (Germany)
Prof. Dr. Michael Vorländer, RWTH Aachen (Germany)
Dr. Franz Zotter, University of Music and Performing Arts, Graz
Dr. Hans-Joachim Maempel, SIMPK Berlin (Germany)

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