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Arsic D.,Muller BBM Vibroakustiksysteme GmbH | Schuller B.,TU Munich
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Video surveillance systems have been introduced in various fields of our daily life to enhance security and protect individuals and sensitive infrastructure. Up to now they have been usually utilized as a forensic tool for after the fact investigations and are commonly monitored by human operators. A further gain in safety can only be achieved by the implementation of fully automated surveillance systems which will assist human operators. In this work we will present an integrated real time capable system utilizing multiple camera person tracking, which is required to resolve heavy occlusions, to monitor individuals in complex scenes. The resulting trajectories will be further analyzed for so called Low Level Activities , such as walking, running and stationarity, applying HMMs, which will be used for the behavior interpretation task along with motion features gathered throughout the tracking process. An approach based on coupled HMMs will be used to model High Level Activities such as robberies at ATMs and luggage related scenarios. © 2011 Springer-Verlag. Source

Putner J.,TU Munich | Lohrmann M.,Muller BBM Vibroakustiksysteme GmbH | Kaltenhauser A.,BMW AG
41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012

For a quantitative ranking of contributions from several sources via different transfer paths to a response, in this example the vehicle interior sound, Transfer Path Analysis is applied. The method used in this experiment is the Operational Transfer Path Analysis, which calculates linearized transfer functions between selected source and response channels using singular value decomposition. For the analysis, several multichannel measurements, containing synchronous data for structure- and air-borne sound, in different operating conditions were performed. The transfer functions calculated from an engine run-up measurement are used to analyze the contributions of the main sound sources over the dominant transfer paths to the vehicle interior noise. In addition, the excitation from the main source was altered while all other aspects of source and structure were kept the same. In this experiment the engine excitation was altered by changing parameters of the engine control unit. Using the calculated transfer functions, predictions of the vehicle interior noise for the altered excitations are evaluated. The resulting sound pressure level of the calculated vehicle interior sound is in accordance with the values from the original measurements. Source

Van Der Seijs M.V.,Technical University of Delft | De Klerk D.,Technical University of Delft | De Klerk D.,Muller BBM Vibroakustiksysteme GmbH | Rixen D.J.,TU Munich
Mechanical Systems and Signal Processing

Transfer Path Analysis (TPA) designates the family of test-based methodologies to study the transmission of mechanical vibrations. Since the first adaptation of electric network analogies in the field of mechanical engineering a century ago, a multitude of TPA methods have emerged and found their way into industrial development processes. Nowadays the TPA paradigm is largely commercialised into out-of-the-box testing products, making it difficult to articulate the differences and underlying concepts that are paramount to understanding the vibration transmission problem. The aim of this paper is to derive and review a wide repertoire of TPA techniques from their conceptual basics, liberating them from their typical field of application. A selection of historical references is provided to align methodological developments with particular milestones in science. Eleven variants of TPA are derived from a unified framework and classified into three categories, namely classical, component-based and transmissibility-based TPA. Current challenges and practical aspects are discussed and reference is made to related fields of research. © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license. Source

Grams P.,Muller BBM Vibroakustiksysteme GmbH | Arsic D.,Muller BBM Vibroakustiksysteme GmbH
Proceedings of Forum Acusticum

The acoustic damping of a vehicle influences the comfort of its passengers. In order to evaluate this it can be helpful to auralize the sound affecting the vehicle. When normalized transfer functions are measured, various operating conditions can be auralized. The presented theories will show an approach not only capable of auralizing constant operating noise at the passenger's ear - for example from the exhaust system or wheel noise - but is also capable of simulating passing maneuvers. In order to auralize passing maneuvers, a sequence of impulse responses representing the transfer functions from different source positions at the passenger's ear is measured. By choosing these source positions along the track of the passing vehicle, the resulting impulse responses can be linked to a dynamic transfer function. The computed dynamic impulse response can be convolved with a source signal describing the passing vehicle. In this way a passing vehicle can be auralized by applying this presented simulation technique. Source

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