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检索条件"机构=Digital Signal Processing and System Theory"

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Improvement by adding video feature in an acoustic ambiance simulation for automobiles 7

Improvement by adding video feature in an acoustic ambiance ...

引用

7th Biennial Workshop on digital signal processing for In-Vehicle systems and Safety 2015

作者： Warhadpande, Alankar Luke, Christian Theiß, Anne Schmidt, Gerhard Digital Signal Processing and System Theory University of Kiel Germany

ISBN: (纸本)9781510827844

In this paper we demonstrate how the combination of acoustical and visual stimuli can be introduced in an ambiance simulation for automobiles. The synchronization of the audio and the video is very important and is discussed in this paper. Furthermore, a subjective evaluation was performed which proved that the combined presentation of acoustical and visual stimuli is more effective than a separate presentation of audio or video. Ten participants were shown seventeen different scenarios. At the time of the evaluation some questions were asked to measure how realistic the ambiance is. Most of the participants felt that the combined audiovisual ambiance simulation is most effective. This result also shows that the audio-visual simulation has a significant effect for creating a realistic ambiance for automobiles.

关键词： Virtual reality

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signal processing for microphone arrays on seat belts

Signal processing for microphone arrays on seat belts

引用

6th Biennial Workshop on digital signal processing for In-Vehicle systems and Safety 2013, DSP 2013

作者： Rajan, Vasudev Kandade Rohde, Sebastian Schmidt, Gerhard Withopf, Jochen Digital Signal Processing and System Theory Kiel University Germany

Microphones placed on the seat belts of an automobile (in the following shortly called beltmics) are an interesting alternative compared to other sensor positions. Because of the small distance to the talker's mouth, usually a good signal quality (e.g. measured in terms of high signal-tonoise ratio) can be achieved. However, the signals may also be disturbed because beltmics can easily be touched by, e.g., clothes and they might be in the air stream of automotive ventilation systems. In addition, applying array processing techniques is difficult because the geometry is flexible and may change over time. This paper presents signal enhancement algorithms designed for beltmics including echo cancellation, estimation of instationary noise, and microphone combining techniques. Results based on a real-time implementation are shown.

关键词： Beamforming

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Mixed Analog-digital Speech Communication for Underwater Applications 14

Mixed Analog-digital Speech Communication for Underwater App...

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14th ITG Conference on Speech Communication

作者： Wisch, Tim Owe Schmidt, Gerhard Digital Signal Processing and System Theory CAU Kiel Kiel Germany

ISBN: (纸本)9783800756285

In some cases, a speech communication link is necessary in underwater environments. While in terms of data communication advanced techniques are investigated and employed, mostly traditional (analog) forms of speech transmission are used for speech communication (at least in commercial products). In this contribution we present a mixed analog-digital approach, that tackles this problem by combining digital and analog approaches. Both transmission paths rely on each other in order to lower the necessary bitrate for the digital part and enhance the signal properties of the analog part. The proposed transmission scheme uses linear predictive coding (LPC) filtering combined with a codebook to whiten the input speech. Afterwards, the resulting signal is power normalized and transmitted in the analog transmission part and the quantized normalization factor is transmitted together with the codebook index in the digital transmission part. This leads to an analog transmission signal which is strongly reduced in dynamics. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Speech communication

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Instrumental evaluation of in-car communication systems 11

Instrumental evaluation of in-car communication systems

引用

11th ITG Symposium on Speech Communication

作者： Theiß, Anne Schmidt, Gerhard Withopf, Jochen Lüke, Christian Department of Digital Signal Processing and System Theory CAU Kiel Germany

ISBN: (纸本)9783800736409

The aim of an in-car communication system is to improve the communication inside a vehicle. This communication is impaired, due to the high background noise occurring at higher velocities and can be improved by recording, processing, and playing back the speech signal of the talking passenger using loudspeakers. Due to this closed electroacoustic loop further issues arise, requiring more sophisticated algorithms, e.g., feedback control. After the development of an ICC system, the quality of the system is of great interest. Not only to analyze and to improve a single ICC system an evaluation is beneficial, but also to compare different ones. However, the term communication quality is not easy to fit into one instrumental measure, since quality depends on a variety of criteria. This contribution gives some first instrumental measures classifying the quality of an ICC system and a first approach to combine these to obtain an overall evaluation strategy. © VDE VERLAG GMBH Berlin Offenbach.

关键词： Quality control

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Impact of a Speaker Head Rotation on the Far-end Listening Situation 14

Impact of a Speaker Head Rotation on the Far-end Listening S...

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14th ITG Conference on Speech Communication

作者： Hübschen, Tobias Al-Mafrachi, Rasool Schmidt, Gerhard Digital Signal Processing and System Theory Kiel University Kiel Germany

ISBN: (纸本)9783800756285

Speech communication and dialog systems inside vehicles are usually optimized for a speaker in the driver’s seat who is permanently facing forward. However while driving, a speaker does repeatedly rotate his head left and right, which changes the properties of the signal picked up by the microphone. This work analyzes to what extent such a speaker head rotation impacts the signal in terms of frequency content, listening quality, and listening effort. By presenting a simple method for compensating the rotation effects and by combining this method with noise reduction and band limitation of the signals, an analysis of the far-end listening situation with and without speaker head rotation compensation is achieved. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Speech communication

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A real-time cognitive-sonar system for diver detection

A real-time cognitive-sonar system for diver detection

引用

MTS/IEEE Washington, OCEANS 2015

作者： Claussen, Tim Nguyen, Viet Duc Heute, Ulrich Schmidt, Gerhard Digital Signal Processing and System Theory University of Kiel Kiel Germany

ISBN: (纸本)9780933957435

Cognitive signal processing has been intensively studied over the past years. Nevertheless, cognitive sonar systems only draw little attention in the research community. In this paper the signal processing of a cognitive sonar system for diver detection is shown in detail. It is inspired by the target-detection system of a bat and thus able to adapt its signal processing units to measured parameters of particular targets. This is done by adjusting the transmitted signal as well as the direction of the transmitted energy of the active sonar system by transmit beamforming. Thereby, it is possible to improve on the one hand the probability of detection of a target for a given signal-to-noise ratio (SNR) as well as signal-to-reverberation ratio (SRR) and, on the other hand, to extend the spatial awareness by adapting the transmit beamformer. This technique leads to a combination of two spatial filters: The receive beampattern and the transmit beampattern. To obtain target-specific parameters, the data form an internal tracking system is used. After showing a general system overview, the core parts of the signal processing are shown in detail. At this point we focus on the Doppler processing with its real-time interpolation and correlation algorithms. Monte-Carlo simulations illustrate the potential of the proposed system by comparing the results with conventional active-sonar signal processing. © 2015 MTS.

关键词： signal to noise ratio

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Feature extraction of modulated marine-mammal sounds for species classification

Feature extraction of modulated marine-mammal sounds for spe...

引用

11th European Conference on Underwater Acoustics 2012, ECUA 2012

作者： Kreimeyer, Roman Digital Signal Processing and System Theory Christian-Albrechts Universität Kiel Germany

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Spectral distance analysis for quality estimation of in-car communication systems 7

Spectral distance analysis for quality estimation of in-car ...

引用

7th Biennial Workshop on digital signal processing for In-Vehicle systems and Safety 2015

作者： Theib, Anne Schmidt, Gerhard Digital Signal Processing and System Theory Christian-Albrechts-Universität zu Kiel Germany

ISBN: (纸本)9781510827844

The communication inside a vehicle can be impaired by a high background noise while driving at medium or higher velocities and by the unusual orientation of the passengers as they are not facing each other. As a consequence the passengers often start to raise their voices and to change their positions by leaning forward or, in case of the front passengers, turning backwards to improve this situation. These adaptations to the communication situation may be uncomfortable, exhausting, and might result in a security risk if the driver turns around. An in-car communication system (ICC system) can improve the communication by recording the speech signals and reproducing the enhanced signals over the loudspeakers inside the compartment that are close to the listening passengers. After and during the design and development of such systems, the achieved quality is of great interest. Therefore, a spectral distance approach is presented in this contribution. Even if spectral distance measures are well established and often used for quality evaluation in speech communication systems, we face here a special challenge, which is the creation of an appropriate reference signal. In addition, an investigation of the reliability of the proposed quality estimate by means of a subjective listening test was performed and the results are presented.

关键词： Quality control

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Robust and High Gain Acoustic Feedback Compensation in the Frequency Domain With a Simple Energy-decay Operator 14

Robust and High Gain Acoustic Feedback Compensation in the F...

引用

14th ITG Conference on Speech Communication

作者： Linhard, Klaus Bulling, Philipp Gimm, Marco Schmidt, Gerhard Digital Signal Processing and System Theory Kiel University Kiel Germany Cerence Ulm Germany

ISBN: (纸本)9783800756285

Acoustic feedback compensation in speech applications often suffers from an insufficient adaptation. As a result feedback whistling may be audible and the compensation gain and generally the speech quality is limited. In this work, we introduce the concept of an energy-decay operator and show how to use it for tap-selective step-size control of a multi-delay frequency-domain filter (MDF). Therefore, we derive a so-called "complex sign-sign algorithm" with an inherently included decay operator. Finally, we show robust simulation results with high amplification although the used algorithm shows very low complexity. Possible applications are in-car communication (ICC) systems or other sound reinforcement applications. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Feedback

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Reducing computational complexity of gating procedures using sorting algorithms

Reducing computational complexity of gating procedures using...

引用

16th International Conference of Information Fusion, FUSION 2013

作者： Nguyen, Viet Duc Claussen, Tim Digital Signal Processing and System Theory Christian-Albrechts-Universität zu Kiel Germany

ISBN: (纸本)9786058631113

Gating is an important part in many data association algorithms, specifically tracking algorithms. Its purpose is the preselection of suitable measurements or observations respectively in order to avoid unlikely measurement-to-track associations. As such, it can be essential for a low computational load. A very common gating method is individual ellipsoidal gating incorporating the Mahalanobis distance. On the one hand it is a reliable gating method used in many different tracking techniques, e.g., the global nearest neighbor method or the Multi-Hypothesis Tracking approach, but on the other hand it can be also very time consuming due to the inversions of covariance matrices related to all the measurement-to-track pairs. In this paper a Gating-by-Sorting approach is proposed to accelerate the gating procedure significantly. It uses sorting algorithms to carry out coarse gating followed by a second ellipsoidal gating step. The gating approach is incorporated into a multi-hypothesis tracker and applied to a real radar dataset. Results are obtained by measuring the computational load within tracking processes. They show that the proposed gating algorithm outperforms classical ellipsoidal gating by orders of magnitude. © 2013 ISIF ( Intl Society of Information Fusi.

关键词： Covariance matrix

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