检索结果-内蒙古大学图书馆

17th International Conference on Information Fusion, FUSION 2014

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

ISBN: (纸本)9788490123553

An efficient individual gating method is described and tested. Compared to other approaches it does not solely calculate distances between the predicted and the actual measurement but checks for overlapping frames centered around them. In contrast to covariance ellipses, these frames are created only by using the main diagonal entries of covariance matrices. The overlap-check is done by sorting algorithms and binary search. Only measurements which pass the overlap-check are further processed by ellipsoid gating. In doing so, not only the computation time itself but also the complexity can be reduced compared to classical ellipsoid or rectangular gating. This Individual-Gating-by-Sorting is integrated into a Multi-Hypothesis tracker and applied to a multistatic sonar dataset. Results show outstanding performances. The gain compared to classical ellipsoid gating in terms of computation even further increases as the amount of data increases. © 2014 International Society of Information Fusion.

关键词： Sorting

来源：评论

学校读者我要写书评

暂无评论

Improvement in listener comfort through noise shaping using a modified wiener filter approach 11

Improvement in listener comfort through noise shaping using ...

引用

11th ITG Symposium on Speech Communication

作者： Rajan, Vasudev Kandade Baasch, Christin Krini, Mohamed Schmidt, Gerhard Department of Digital Signal Processing and System Theory Kiel University Germany Paragon AG Delbrueck Germany

ISBN: (纸本)9783800736409

The Wiener filter approach to noise suppression is well known both theoretically and practically. This paper explains the idea of extending this filtering approach to shape the residual noise of the output signal. Motivated by different kinds of stationary and instationary noise sources that appear in an automobile, along with the necessity to address the problem of increasing the listener comfort, an algorithm to achieve a time-frequency varying attenuation in the lower frequencies has been developed. The basic theory and the conditions to achieve this are presented. Details of the developed compressor algorithm as well as the modifications necessary to apply it to the classical Wiener filter are shown. The improvement that the modified filter brings to the noise input signal are significant and analyses of the results clearly show a reduction of the "ruggedness" of the input signal. © VDE VERLAG GMBH Berlin Offenbach.

关键词： Bandpass filters

来源：评论

学校读者我要写书评

暂无评论

Parkinson-speech analysis: Methods and aims

Parkinson-speech analysis: Methods and aims

引用

12. ITG-Fachtagung Sprachkommunikation - 12th ITG Conference on Speech Communication

作者： Baasch, Christin Schmidt, Gerhard Heute, Ulrich Nebel, Adelheid Deuschl, Günther Digital Signal Processing and System Theory Christian-Albrechts-Universität zu Kiel Kiel24143 Germany

ISBN: (纸本)9783800742752

Parkinson's Disease (PD) is one of the most frequent neurodegenerative diseases worldwide. Besides motor disorders, patients affected by this disease mostly suffer from a speech disorder named dysarthria. It is treated by different speech therapies. As a part of that, it is practice to observe the progress of the patients' dysarthria by classifying its severity by one of different possible scales like the National Technical Institute of the Deaf (NTID) scale. These ratings are currently done by auditive assessments, which are very time consuming and expensive. This work presents the conception of a tool for acoustical analysis of Parkinson speech and classification of the severity of the speech disorder, with the goal to improve the success of the speech therapies and simplify the classification. © 2016 VDE VERLAG GMBH.

关键词： Neurodegenerative diseases

来源：评论

学校读者我要写书评

暂无评论

Real-time cognitive sonar system with target-optimized adaptive signal processing through multi-layer data fusion

Real-time cognitive sonar system with target-optimized adapt...

引用

IEEE International Conference on Multisensor Fusion and lntegration for Intelligent systems, MFI 2015

作者： Claussen, Tim Nguyen, Viet Duc Faculty of Electrical and Information Engineering Digital Signal Processing and System Theory Kiel University Kiel24143 Germany

ISBN: (纸本)9781479977727

In this contribution a proof-of-concept of a real-time cognitive sonar system is shown and tested in simulations. In the field of radar applications the principle of a cognitive system has been intensively studied over the past years. However, cognitive sonar systems draw only little attention in the reseach community. In this paper we are showing a new approach for a cognitive sonar system, that is able to adapt its signal processing to measured parameters of particular targets. This is possible by the fusion of the information of different data layers. Data resulting from an internal tracking module is used to adapt the signal processing at sensor layer. This is done by adjusting the transmit signal and the direction of the transmitted energy via transmit beamforming. These adjustments improve, on the one hand, the signal-to-noise ratio (SNR) and the signal-to-reverberation ratio (SRR) of the target through the adaption of the transmitted signal, and, on the other hand, extend the spatial awareness by adapting the transmit beamformer, which results in a combination of two spatial filters: the receive beampattern and the transmit beampattern. © 2015 IEEE.

关键词： Data fusion

来源：评论

学校读者我要写书评

暂无评论

Is Intelligibility Still the Main Problem? A Review of Perceptual Quality Dimensions of Synthetic Speech 8

Is Intelligibility Still the Main Problem? A Review of Perce...

引用

8th ISCA Tutorial and Research Workshop on Speech Synthesis, SSW 2013

作者： Hinterleitner, Florian Norrenbrock, Christoph R. Möller, Sebastian Quality and Usability Lab TU Berlin Germany Digital Signal Processing and System Theory CAU Kiel Germany

In this paper, we present a comparative overview of 9 studies on perceptual quality dimensions of synthetic speech. Different subjective assessment techniques have been used to evaluate the text-to-speech (TTS) stimuli in each of these tests: in a semantic differential, the test participants rate every stimulus on a given set of rating scales, while in a paired comparison test, the subjects rate the similarity of pairs of stimuli. Perceptual quality dimensions can be derived from the results of both test methods, either by performing a factor analysis or via multidimensional scaling. We show that even though the 9 tests differ in terms of used synthesizer types, stimulus duration, language, and quality assessment methods, the resulting perceptual quality dimensions can be linked to 5 universal quality dimensions of synthetic speech: (i) naturalness of voice, (ii) prosodic quality, (iii) fluency and intelligibility, (iv) disturbances, and (v) calmness. © SSW 2013. All rights reserved.

关键词： Quality control

来源：评论

学校读者我要写书评

暂无评论

P 130—The influence of different settings on accuracies of gait algorithms

引用

Gait and Posture 2018年第Sup1期65卷 454-455页

作者： Warmerdam, E. Pham, M.H. Hansen, C. Maetzler, W. Christian-Albrechts-University Neurology Kiel Germany Christian-Albrechts-University Digital Signal Processing and System Theory Kiel Germany

来源：评论

学校读者我要写书评

暂无评论

Generalized spectral refinement and its applications

Generalized spectral refinement and its applications

引用

5th Biennial Workshop on digital signal processing for In-Vehicle systems, DSP 2011

作者： Krini, Mohamed Iser, Bernd Schmidt, Gerhard SVOX Deutschland GmbH Acoustic Signal Enhancement Germany Christian-Albrechts-Universit at zu Kiel Digital Signal Processing and System Theory Germany

In this contribution a generalized method for spectral refinement is presented which is applied as a post-processing stage after a conventional frequency analysis of speech signals. The principle idea of the generalized spectral refinement (GSR) method is to refine each subband signal after a frequency decomposition individually and to compute additional frequency supporting points in between using a linear combination of the current as well as preceding and successive short-term spectra. For its efficient implementation a simplification of the GSR method is derived - it can be shown that the refinement can easily be implemented using short FIR-filters in each subband. This results in a very low computational complexity. The proposed method has been applied as a pre-processing stage for fundamental frequency estimation as well as for echo cancellation. Evaluations have shown that pitch frequency estimation methods can significantly be improved for all SNR considered when employing GSR method. Echo cancellation experiments confirm that GSR can enhance the performance in terms of steady-state convergence.

关键词： Speech enhancement

来源：评论

学校读者我要写书评

暂无评论

Automatic Localization of an Ultrasound Probe with the Help of Magnetic Sensors

引用

Current Directions in Biomedical Engineering 2022年第2期8卷 317-320页

作者： Bald, Christin Bergholz, Robert Schmidt, Gerhard Digital Signal Processing and System Theory Institute of Electrical Engineering and Information Technology Faculty of Engineering Christian-Albrechts-Universität zu Kiel Kaiserstraße 2 Kiel Germany Digital Signal Processing and System Theory Institute of Electrical Engineering and Information Technology Faculty of Engineering Christian-Albrechts-Universität zu Kiel Kiel Germany Pediatric Surgery Faculty of Medicine Christian-Albrechts-Universität zu Kiel Kiel Germany

Ultrasound measurements are a widely used instrument in clinical practice. For later traceability of the images, the position (and orientation) of the ultrasound probe must be recorded during the measurement. Until now this has to be done manually by the physician. An easier and more accurate approach would be the automatic tracking of the ultrasound probe. This contribution shows a first approach for automatically localizing the ultrasonic head during measurement. The proposed method is based on coils surrounding the patient bed and a 3D magnetic sensor placed on the ultrasound head. Besides some pre- and postprocessing steps, the proposed localization algorithm is based on trilateration followed by a least mean squares approach for refinement of the estimation. In a first proof-of-concept measurement with fixed positions and orientations of the ultrasound head a mean accuracy of 2.85 cm and 8.94 was achieved. Additionally, a measurement with a moving ultrasound head is presented to demonstrate the real-time capability of the system. Finally, future steps for improving the automatic measurement are discussed, including a graphical user interface for the physician and the use of magnetoelectric sensors for measurement. © 2022 The Author(s), published by De Gruyter.

关键词： Ultrasonics

来源：评论

学校读者我要写书评

暂无评论

Evaluation of communication systems for full-face firefighter masks

Evaluation of communication systems for full-face firefighte...

引用

12. ITG-Fachtagung Sprachkommunikation - 12th ITG Conference on Speech Communication

作者： Brodersen, Michael Jüngling, Thorben Moritz Schmidt, Gerhard Dräger Safety AG and Co. KGaA Lübeck23560 Germany Digital Signal Processing and System Theory Kiel University Kiel24143 Germany

ISBN: (纸本)9783800742752

When firefighters wear full-face masks with so-called self-contained breathing apparatus for ensuring clean air supply, the speech is strongly attenuated due to the characteristics of the masks. For this reason communication units are attached to the masks to enhance the communication. The microphones of these units are picking up the speech signals. After enhancing the signals, they are played back via loudspeakers (in front of the mask), transmitted via so-called team radio (received from other communication units), and can be connected to a tactical radio. Since communication is important for successful operation of firefighters, different systems should be compared and, to document the progress of enhancement, (automatic) evaluation of such systems should also be investigated. In this paper we present an overview about evaluation strategies and show several first attempts based on measures such as signal-to-noise ratio, spectral distance, delay, speech transmission index, and perceptual objective listening quality assessments. © 2016 VDE VERLAG GMBH.

关键词： signal to noise ratio

来源：评论

学校读者我要写书评

暂无评论

Investigation of self-masking effects for the evaluation of in-car communication systems

Investigation of self-masking effects for the evaluation of ...

引用

International Workshop on Acoustic signal Enhancement (IWAENC)

作者： Anne Theiß Gerhard Schmidt Digital Signal Processing and System Theory CAU Kiel Germany

The communication situation inside a passenger compartment can be impaired due to a high background noise at higher ve-locities. An In-Car Communication system (ICC system) is capable of improving this situation by recording the speech signal and reproducing the enhanced speech signal via the integrated loudspeakers. Due to this playback the speech level at the ears of listening passenger is increased but the signal is also fed back to the talking passenger. This might be disturbing for the talking passenger and hence might also be a quality issue of an ICC system. Up to now, the impact of this effect is not entirely clear and has not been investigated in detail yet. This contribution gives a first glance on this self-masking effect. Therefore, a psycho-acoustic experiment with test persons is presented in which these subjects should define in various scenarios, if the feedback is audible or even disturbing. The parameters of a scenario such as the delay of the feedback, the frequency range, and the current background noise are varied. Finally, the effect of the different parameters on the talking passenger and the impact on the quality of an ICC system is investigated.

关键词： Delays Noise Speech Gain Loudspeakers Acoustics Vehicles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：