@article{11821, abstract = {{This paper addresses the robustness of automatic speech recognition to environmental noise. In order to account for reliability of the clean feature estimate we employ the feature posterior density conditioned on observed noisy features to perform uncertainty decoding. We investigate two approaches to estimate the posterior using a discrete feature space, first conditioning only on the current observation, and second on the whole feature sequence of an utterance. Experiments with Aurora 2 showed that the latter provides slightly better performance, as it allows for exploiting the temporal correlations between consecutive features.}}, author = {{Ion, Valentin and Haeb-Umbach, Reinhold}}, journal = {{2008 ITG Conference on Voice Communication (SprachKommunikation)}}, pages = {{1--4}}, title = {{{Investigations into Uncertainty Decoding Employing a Discrete Feature Space for Noise Robust Automatic Speech Recognition}}}, year = {{2008}}, } @inproceedings{11851, abstract = {{In diesem Beitrag werden zwei neuartige akustische Strahlformungsalgorithmen fuer einen Einsatz im KFZ diskutiert. In beiden Verfahren ist fuer jede Frequenzkomponente der Eigenvektor zum groessten Eigenwert eines verallgemeinerten Eigenwertproblems zu bestimmen: bei der einen Varianate stellen die Filterkoeffizienten gerade obigen Eigenvektor dar. Sprachverzerrungen werden mit einem einkanaligen Nachfilter kompensiert. In der anderen Variante, welche die Struktur eines ''Generalized Sidelobe Cancellers'' (GSC) hat, basiert die Blockiermatrix auf obiger Eigenvektorzerlegung.}}, author = {{Krueger, Alexander and Warsitz, Ernst and Haeb-Umbach, Reinhold}}, booktitle = {{34. Deutsche Jahrestagung fuer Akustik (DAGA 2008)}}, title = {{{Blinde Akustische Strahlformung fuer Anwendungen im KFZ}}}, year = {{2008}}, } @article{11914, abstract = {{This paper considers the convolutive blind source separation of speech sources in the presence of spatially correlated noise. We introduce a method for estimating the scaled mixing matrix from the sources to the microphones even if coherent noise is present. This is achieved by combining time-frequency sparseness with the generalized eigenvalue decomposition of the power spectral density matrix (PSD) of the noisy speech and noise-only microphone signals. Separation is performed by spatial filtering with coefficients constructed by Gram-Schmidt orthogonalization which places spatial nulls at the interferer{^A}?`s direction. Experimental results show that our approach is capable of separating 2 sources in a reverberant environment (RT60=0ms..500ms) degraded by significant directional noise.}}, author = {{Tran Vu, Dang Hai and Haeb-Umbach, Reinhold}}, journal = {{2008 ITG Conference on Voice Communication (SprachKommunikation)}}, pages = {{1--4}}, title = {{{Blind Speech Separation in Presence of Correlated Noise with Generalized Eigenvector Beamforming}}}, year = {{2008}}, } @inproceedings{11915, abstract = {{This Paper deals with a new Technique for multi-channel separation of speech signals from convolutive mixtures under coherent noise. We demonstrate how the scaled transfer functions from the sources to the microphones can be estimated even in the presence of stationary coherent noise. The key to this are generalized eigenvalue decompositions of the power spectral density (PSD) matrices of the noisy speech and noise-only microphone signals with a controlled estimation of these matrices exploiting time-frequency sparseness of the speech sources. Separation is further improved by subsequent Gram-Schmidt orthogonalization which places spatial nulls at the interferers{\rq} directions, while noise reduction is improved by employing a novel blocking matrix and adaptive interference canceller in a Generalized Sidelobe Canceller (GSC)-like structure. We report promising experimental results for 2 speech sources with significant coherent noise in reverberant environments (RT60=0oms..500ms).}}, author = {{Tran Vu, Dang Hai and Krueger, Alexander and Haeb-Umbach, Reinhold}}, booktitle = {{International Workshop on Acoustic Echo and Noise Control (IWAENC 2008)}}, title = {{{Generalized Eigenvector Blind Speech Separation Under Coherent Noise In A GSC Configuration}}}, year = {{2008}}, } @inproceedings{11935, abstract = {{The generalized sidelobe canceller by Griffith and Jim is a robust beamforming method to enhance a desired (speech) signal in the presence of stationary noise. Its performance depends to a high degree on the construction of the blocking matrix which produces noise reference signals for the subsequent adaptive interference canceller. Especially in reverberated environments the beamformer may suffer from signal leakage and reduced noise suppression. In this paper a new blocking matrix is proposed. It is based on a generalized eigenvalue problem whose solution provides an indirect estimation of the transfer functions from the source to the sensors. The quality of the new generalized eigenvector blocking matrix is studied in simulated rooms with different reverberation times and is compared to alternatives proposed in the literature.}}, author = {{Warsitz, Ernst and Krueger, Alexander and Haeb-Umbach, Reinhold}}, booktitle = {{IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2008)}}, keywords = {{adaptive interference canceller, adaptive signal processing, array signal processing, beamforming method, eigenvalues and eigenfunctions, generalized eigenvector blocking matrix, generalized sidelobe canceller, interference suppression, matrix algebra, noise suppression, speech enhancement, transfer function estimation, transfer functions}}, pages = {{73--76}}, title = {{{Speech enhancement with a new generalized eigenvector blocking matrix for application in a generalized sidelobe canceller}}}, doi = {{10.1109/ICASSP.2008.4517549}}, year = {{2008}}, } @inproceedings{11939, abstract = {{In this paper a switching linear dynamical model (SLDM) approach for speech feature enhancement is improved by employing more accurate models for the dynamics of speech and noise. The model of the clean speech feature trajectory is improved by augmenting the state vector to capture information derived from the delta features. Further a hidden noise state variable is introduced to obtain a more elaborated model for the noise dynamics. Approximate Bayesian inference in the SLDM is carried out by a bank of extended Kalman filters, whose outputs are combined according to the a posteriori probability of the individual state models. Experimental results on the AURORA2 database show improved recognition accuracy.}}, author = {{Windmann, Stefan and Haeb-Umbach, Reinhold}}, booktitle = {{IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2008)}}, keywords = {{a posteriori probability, AURORA2 database, Bayesian inference, Bayes methods, channel bank filters, extended Kalman filter banks, hidden noise state variable, Kalman filters, noise dynamics, speech enhancement, speech feature enhancement, speech feature trajectory, switching linear dynamical model approach}}, pages = {{4409--4412}}, title = {{{Modeling the dynamics of speech and noise for speech feature enhancement in ASR}}}, doi = {{10.1109/ICASSP.2008.4518633}}, year = {{2008}}, } @article{11940, abstract = {{In this paper, the noise estimation for model-based speech feature enhancement in automatic speech recognition (ASR) is investigated. Beside a stationary noise prior, three linear state space models for the (cepstral) noise process are considered. We have derived novel EM algorithms for the estimation of the noise model parameters: A blockwise EM algorithm is applied on noise-only input data. It is supposed to be used during the offline training mode of the recognizer. Further a sequential online EM algorithm is employed to adapt the observation variance in recognition mode which works as well under the asumption of a stationary noise prior and a linear state model for the noise. Experiments on the AURORA4 database lead to improved recognition results with the new state model compared to the assumption of stationary noise.}}, author = {{Windmann, Stefan and Haeb-Umbach, Reinhold}}, journal = {{2008 ITG Conference on Voice Communication (SprachKommunikation)}}, pages = {{1--4}}, title = {{{A novel approach to noise estimation in model-based speech feature enhancement}}}, year = {{2008}}, } @article{11944, abstract = {{In this paper, a novel segmental Hidden Markov Model (HMM) is proposed. The model is based on a modified emission density where additional statistical dependencies between subsequent frames of the speech signal are considered. In the following we derive an effective search strategy for the modified statistical model. Further an approach to parameter reduction is introduced. Experiments were carried out on the AURORA2 database where consistent im}}, author = {{Windmann, Stefan and Haeb-Umbach, Reinhold and Leutnant, Volker}}, journal = {{2008 ITG Conference on Voice Communication (SprachKommunikation)}}, pages = {{1--4}}, title = {{{A segmental HMM based on a modified emission probability}}}, year = {{2008}}, } @article{32518, abstract = {{This study investigates age-related changes and dyadic-specific differences in adult child–parent relationships. Using an individuation framework, two German samples of 224 and 105 participants aged between 21 and 47 years were administered the Network of Relationships Inventory, the Emotional Autonomy Scale and the Authority Reciprocity Questionnaire. Factor analyses resulted in a measurement model valid for adult children, their mothers and fathers. The model includes connectedness (with emotional and cognitive aspects) as well as individuality (assessed as power symmetry). Connectedness decreased with age. Symmetry in father–child relationships increased over time, while mother–child relationships were perceived to be symmetrical by early adulthood. Child–mother relationships were more connected than child–father relationships. Sons described themselves as more powerful than did daughters.}}, author = {{Buhl, Heike M.}}, journal = {{International Journal of Behavioral Development}}, keywords = {{adult child–parent relationships, adulthood, connectedness, Germany, individuation, symmetry}}, number = {{5}}, pages = {{381 -- 389}}, title = {{{Development of a model describing individuated adult child-parent relationships}}}, volume = {{32}}, year = {{2008}}, } @misc{47685, author = {{Schrieb, Jonas}}, keywords = {{Diplomarbeit}}, title = {{{Construction and Applications of Identity-Based Encryption without Pairings}}}, year = {{2008}}, } @misc{53752, author = {{Reis, Oliver}}, booktitle = {{socialnet Rezensionen}}, title = {{{Garz, Detlef: Sozialpsychologische Entwicklungstheorien. 3. erw. Auflage, Wiesbaden 2006}}}, year = {{2008}}, } @misc{18663, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1132.01001}}, title = {{{Bolzano, Bernard, On the Mathematical Method and Correspondence with Exner, transl. by Paul Rusnock/Rolf George, Amsterdam: Rodopi (Studien zur Österreichischen Philosophie; 37)}}}, year = {{2008}}, } @misc{18664, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1133.01002}}, title = {{{Ekeland, Ivar, "The Best of All Possible Worlds. Mathematics and Destiny", University of Chicago Press: Chicago, IL 2006}}}, year = {{2008}}, } @misc{18654, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1126.03011}}, title = {{{Lorenz, Kuno, “Logic as Tool of Science versus Logic as a Scientific Subject”, in: Johan van Benthem et al. (eds.), The Age of Alternative Logics. Assessing Philosophy of Logic and Mathematics Today. Based on the Conference on Philosophical Insights into Logic and Mathematics, Nancy, France, September 30–October 4, 2002, Dordrecht: Springer 2006, 299–310}}}, year = {{2008}}, } @misc{18659, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1131.03004}}, title = {{{Vidal-Rosset, Joseph, “Does Gödel’s Incompleteness Theorem Prove that Truth Transcends Proof”, in: van Bentham et al. (eds.), The Age of Alternative Logics. Assessing Philosophy of Logic and Mathematics Today, Dordrecht: Springer 2006, 51–73}}}, year = {{2008}}, } @misc{18652, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1125.00005}}, title = {{{Wilholt, Torsten, Zahl und Wirklichkeit. Eine philosophische Untersuchung über die Anwendbarkeit der Mathematik, mentis Verlag: Paderborn 2004}}}, year = {{2008}}, } @misc{17797, author = {{Peckhaus, Volker}}, booktitle = {{History and Philosophy of Logic}}, pages = {{87--88}}, title = {{{Simon Blackburn, The Oxford Dictionary of Philosophy, second edition. Oxford: Oxford University Press, 2005}}}, volume = {{29}}, year = {{2008}}, } @misc{18657, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1129.00001}}, title = {{{Bueno, Otávio/Zalta, Edward N., “A Nominalist’s Dilemma and its Solution”, Philosophia Mathematica (3) 13 (2005), 294-307}}}, year = {{2008}}, } @misc{18666, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1141.00006}}, title = {{{Leng, Mary, “Revolutionary Fictionalism: A Call to Arms”, Philosophia Mathematica (3) 13 (2005), 277–293}}}, year = {{2008}}, } @misc{18661, author = {{Peckhaus, Volker}}, booktitle = {{zbMATH Open, Zbl. 1141.00007}}, title = {{{Mancosu, Paolo, “Mathematical Explanation: Problems and Prospects”, Topoi 20 (2001), 97–117}}}, year = {{2008}}, }