Disziplinübergreifende Projekte (SFB, TR etc.)

24 Items

Recent Submissions
Apples and oranges : a methodological framework for basic research into audiovisual perception

Maempel, Hans-Joachim (2017)

In recent years, increased efforts have been made to investigate the various aspects of audiovisual perception. In general, highly-specific variables are considered, and specific paradigms and methods are applied. Thus, connecting results of various experiments is not always possible in a systematic manner, and several related research fields still lack comprehensive theories and corresponding ...

The FABIAN head-related transfer function data base

Brinkmann, Fabian (2017-02-09)

This data base includes head-related transfer functions (HRTFs), headphone transfer functions (HpTFs), and 3D-meshes of the FABIAN head and torso simulator. More detailed information is provided in the documentation within the data base.

A Database of Anechoic Microphone Array Measurements of Musical Instruments

Weinzierl, Stefan ; Vorländer, Michael ; Behler, Gottfried ; Brinkmann, Fabian ; von Coler, Henrik ; Detzner, Erik ; Krämer, Johannes ; Lindau, Alexander ; Pollow, Martin ; Schulz, Frank ; Shabtai, Noam R. (2017-04-10)

A collection of 3305 single notes of 41 musical instruments of different historical periods was recorded and analyzed. The database includes the instrument recordings, radiation patterns (directivities), and audio features such as the sound power or spectral centroid along with information about the identity and the making of the instrument and its player. The database can be used in virtual r...

Film265: Report on Achieved Quality Improvements

Álvarez-Mesa, Mauricio ; Sanz-Rodríguez, Sergio (2016-06-30)

This document presents the results of the informal video quality subjective tests performed in the context of the Film265 project. In this project a new implementation of the HEVC/H.265 video coding standard has been developed, which obtains higher quality and higher compression efficiency than previous codecs such as the H.264/AVC, and other implementations of the HEVC/H.265 encoder (such as t...

Film265: Report on Achieved Quality Improvements: Public Version. Research Data

Álvarez-Mesa, Mauricio ; Sanz-Rodríguez, Sergio (2016-06-30)

This data set contains the results of the informal video quality subjective tests performed in the context of the Film265 project. In this project a new implementation of the HEVC/H.265 video coding standard has been developed that obtains higher quality and higher compression efficiency than previous codecs such as the H.264/AVC, and other implementations of the HEVC/H.265 encoder (such as the...

Pitch distributions for individual instruments in the symphonies No. 1-9 of L.v. Beethoven

Quiring, Roman ; Weinzierl, Stefan (2016)

This dataset contains pitch distributions for the symphonies No. 1-9 of Ludwig van Beethoven. Data is available for all symphonies, all movements, and every musical instrument separately. Pitch distributions are represented as histograms in the MIDI pitch range. For transposing instruments, the pitch distributions refer to the sounding, not the written pitch. See the file header for information...

Single-channel and binaural room impulse responses of a 64-channel loudspeaker array for different room configurations

Erbes, Vera ; Geier, Matthias ; Weinzierl, Stefan ; Spors, Sascha (2015-04-21)

The database contains measured single-channel and binaural room impulse responses (RIRs and BRIRs) of a 64-channel loudspeaker array of square shape under varying room acoustical conditions. The measurements have been performed at the Audio Lab of the Institute of Communications Engineering, University of Rostock. The RIRs have been measured at three receiver positions for four different absorb...

Data-driven interpolation of dynamical systems with delay

Schulze, Philipp ; Unger, Benjamin (2015)

We present a data-driven realization for systems with delay, which generalizes the Loewner framework. The realization is obtained with low computational cost directly from measured data of the transfer function. The internal delay is estimated by solving a least-square optimization over some sample data. Our approach is validated by several examples, which indicate the need for preserving the d...

A Matlab toolbox for the regularization of descriptor systems arising from generalized realization procedures

Binder, Amelie ; Mehrmann, Volker ; Miedlar, Agnieszka ; Schulze, Philipp (2015)

In this report we introduce a Matlab toolbox for the regularization of descriptor systems. We apply it, in particular, for systems resulting from the generalized realization procedure of [16], which generates, via rational interpolation techniques, a linear descriptor system from interpolation data. The resulting system needs to be regularized to make it feasible for the use in simulation, opti...

The shifted proper orthogonal decomposition

Reiss, Julius ; Schulze, Philipp ; Sesterhenn, Jörn (2015)

Transport-dominated phenomena provide a challenge for common mode-based model reduction approaches. We present a model reduction method, which extends the proper orthogonal decomposition (POD) by introducing time-dependent shifts of the snapshot matrix. The approach, called shifted proper orthogonal decomposition (sPOD), features a determination of the multiple transport velocities and a separa...

Port-Hamiltonian realizations of linear time invariant systems

Beattie, Christopher ; Mehrmann, Volker ; Xu, Hongguo (2015)

The question when a general linear time invariant control system is equivalent to a port-Hamiltonian systems is answered. Several equivalent characterizations are derived which extend the characterizations of [38] to the general non-minimal case. An explicit construction of the transformation matrices is presented. The methods are applied in the stability analysis of disc brake squeal.

On the port-Hamiltonian structure of the Navier-Stokes equations for reactive flows

Altmann, Robert ; Schulze, Philipp (2016)

We consider the problem of finding an energy-based formulation of the Navier-Stokes equations for reactive flows. These equations occur in various applications, e. g., in combustion engines or chemical reactors. After modeling, discretization, and model reduction, important system properties as the energy conservation are usually lost which may lead to unphysical simulation results. In this pa...

Numerical solution of singularly perturbed convection-diffusion-reaction problems with two small parameters

Das, Pratibhamoy ; Mehrmann, Volker (2015)

This paper discusses the numerical solution of 1-D convection-diffusion-reaction problems that are singularly perturbed with two small parameters using a new mesh-adaptive upwind scheme that adapts to the boundary layers. The meshes are generated by the equidistribution of a special positive monitor function. Uniform, parameter independent convergence is shown and holds even in the limit that ...

Proceedings of the EAA Joint Symposium on Auralization and Ambisonics 2014

(2014-08-07)

In consideration of the remarkable intensity of research in the field of Virtual Acoustics, including different areas such as sound field analysis and synthesis, spatial audio technologies, and room acoustical modeling and auralization, it seemed about time to organize a second international symposium following the model of the first EAA Auralization Symposium initiated in 2009 by the acoustics...

Binaural resynthesis of acoustical environments

Lindau, Alexander (2014-07-08)

Diese Dissertation umfasst eine Sammlung von Veröffentlichungen, die der technischen und perzeptiven Optimierung der binauralen Resynthese akustischer Umgebungen gewidmet sind. Binaurale Resynthese beruht auf der Grundannahme, dass es möglich ist, den auditiven Eindruck einem beliebigen Schallfeld ausgesetzt zu sein, künstlich zu evozieren, wenn es gelingt, den entsprechenden Schalldruckverlauf...

Shockless explosion combustion

Bobusch, Bernhard C. ; Berndt, Phillip ; Paschereit, Christian Oliver ; Klein, Rupert (2014-09-30)

Constant volume combustion (CVC) in gas turbines is a promising way to achieve a step change in the efficiency of such systems. The most widely investigated technique to implement CVC in gas turbine systems is pulsed detonation combustion (PDC). Unfortunately, the PDC is associated with several disadvantages, such as sharp pressure transitions, entropy generation due to shock waves, and exergy ...

Investigation of Fluidic Devices for Mixing Enhancement for the Shockless Explosion Combustion Process

Bobusch, Bernhard ; Berndt, Phillip ; Paschereit, Christian Oliver ; Klein, Rupert (2014-09)

Fuel-air mixing is a crucial process in low emission combustion systems. A higher mixing quality leads to lower emissions and higher combustion efficiencies. Especially for the innovative constant volume combustion processes "Shockless Explosion Combustion" (SEC) the mixing of fuel and air is an important parameter, since the whole combustion process is triggered and controlled via the equivale...

Spatial Audio Quality Inventory (SAQI). Test Manual.

Lindau, Alexander (2014-02-27)

The perceptual evaluation of virtual acoustic environments may be based on overall criteria such as plausibility and authenticity or by using catalogues of more detailed auditory qualities as, e.g., loudness, timbre, localization, etc. However, only the latter will be suitable to reveal specific shortcomings of a simulation under test and allow for a directed technical improvement. To this end ...

Experimental investigation of a turbine sealing cavity exposed to free stream pressure fluctuation

Schliwka, Tobias ; Malzacher, Leonie ; Chemnitz, Silvio ; Peitsch, Dieter (2014-09-10)

The current investigation examines the impact of a new pulsed unsteady combustion to the turbine sealing cavity, which prevents hot gas ingestion into the inner machine. Sealing flow is ensured by relatively cold secondary air blowing radially through the rotor-stator-wheel space. The interaction between the sealing flow and the main gas flow however causes aerodynamic losses. These losses as w...

Active Flow Control by Adaptive Blade Systems in Periodic Unsteady Flow Conditions

Hammer, Steffen ; Phan, Dat Tien ; Peter, Julija ; Werder, Tobias ; Meyer, Robert ; Liebich, Robert ; Thamsen, Paul Uwe (2014-09-10)

A test stand to investigate the rotor-stator interaction of a compressor stage is presented. This water channel allows to investigate the influence of wake depressions and choking to a stator cascade. Furthermore, adaptive blade systems are presented to affect the operating of stator under periodic unsteady flow conditions. The piezoelectric actuators are one of these adaptive blade systems. Th...