Jan Ole Jungmann

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Virtual 3-D sound can be easily delivered to a listener by binaural audio signals that are reproduced via headphones, which guarantees that only the correct signals reach the corresponding ears. Reproducing the binaural audio signal by two or more loudspeakers introduces the problems of crosstalk on the one hand, and, of reverberation on the other hand. In(More)
The purpose of room impulse response reshaping is to reduce reverberation and thus to improve the perceived quality of the received signal by prefiltering the source signal before it is played with a loudspeaker. The filter design is usually carried out by solving an optimization problem. There are, in general, two possibilities to improve the robustness of(More)
In this contribution, six different single-channel dereverberation algorithms are evaluated subjectively in terms of speech intelligibility and speech quality. In order to study the influence of the dereverberation algorithms on speech intelligibility, speech reception thresholds in noise were measured for different reverberation times. The quality ratings(More)
In listening room compensation, the aim is to compensate for the degradations that are rendered to an audio signal by transmission in a closed room. Due to multiple reflections of the soundwaves, the listener receives a superposition of delayed and attenuated versions of the source signal. A filter is designed so that the convolution of the room impulse(More)
The purpose of room impulse response reshaping is usually to reduce reverberation and thus to improve the perceived quality of the received signal by prefiltering the source signal before it is played with a loudspeaker in a closed room or by postfiltering the recorded microphone signal. The utilization of an infinity- and/or p-norm based objective function(More)
By using room impulse response shortening and shaping it is possible to reduce the reverberation effects and therefore improve speech intelligibility. This may be achieved by a prefilter that modifies the overall impulse response to have a stronger attenuation. For achieving a spatial robustness, multichannel approaches have been proposed. Unfortunately,(More)
This paper reports on the evaluation of several objective quality measures for predicting the quality of the dereverberated speech signals. The correlations between subjective quality assessment for single-channel dereverberation techniques and objective speech quality as well as speech intelligibility measures are analyzed and discussed. Six different(More)
By using room impulse response shortening and reshaping it is possible to reduce the reverberation effects and therefore improve the perceived quality. This may be achieved by a prefilter that modifies the overall impulse response to have a faster decay. The traditional filter shortening approach using least-squares methods is fast and directly computable,(More)
Crosstalk cancellation is a well-known technique to deliver virtual 3D sound to a listener via two or more loudspeakers. In this method, the binaural source signals are processed with a network of prefilters prior to loudspeaker reproduction in order to ensure that only the prescribed source signals reach the corresponding ears of the listener, such that(More)
Kurzfassung. In der vorliegenden Arbeit stellen wir ein neues Modell zur Kopplung des Tumormasseeffektes an die, der Wachstumsmodellierung unterliegende, anisotrope Reaktionsdiffusionsgleichung vor. Die Gleichung wird auf einem hochaufgelösten Voxelgitter diskretisiert. Eine Modellierung der Anisotropie des Diffusionsprozesses ermöglicht die Integration von(More)