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Realization adaptive strategies and a comparison of Fourier bandwidth, Shannon bandwidth, and Campbell bandwidth

Realization adaptive strategies and a comparison of Fourier ...

引用

Data Compression Conference (DCC)

作者： Wenye Tang Tao He J.D. Gibson Globespan Virata Inc. Red Bank NJ USA Electrical Engineering Department Southern Methodist University Dallas TX USA Media Arts and Technology Program & Electrical and Computer Engineering University of California at Santa Barbara Santa Barbara CA USA

In 1960, Campbell derived a quantity that he defined as the coefficient rate of a random process that involves the process spectral entropy. However, no potential applications of the coefficient rate were identified. Two new derivations of Campbell's rate coefficient rate are presented. One derivation solidifies the interpretation of this quantity as a coefficient rate and allows definition of an effective bandwidth for the process. The second derivation implies a new approach for realization adaptive source compression. The coefficient rate can be used for realization adaptive coefficient selection in a sequence of source representations. Furthermore, the effective bandwidth is designated as Campbell bandwidth and contrasted with Fourier bandwidth and Shannon bandwidth. Several specific examples are presented that illustrate the differences among the three quantities.

关键词： Bandwidth Entropy Random processes Electronic mail Image coding Speech processing Discrete cosine transforms Energy measurement Helium Codes

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A high-efficiency reconfigurable digital signal processor for multimedia computing

A high-efficiency reconfigurable digital signal processor fo...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Li-Hsun Chen O.T.-C. Chen Ruey-Ling Ma Signal and Media Laboratories Department of Electrical Engineering National Chung Cheng University Chiayi Taiwan Computer System Development Department Computer & Communications Research Laboratories Industrial Technology and Research Institute Hsinchu Taiwan

In this work, a high-efficiency reconfigurable digital signal processor (DSP) that consists of two arithmetic logic units and a reconfigurable computation unit is designed. The design methodology for the reconfigurable computation unit is explored based on the intermediate grain framework. The proposed reconfigurable computation unit includes 8/spl times/8 array processing elements and interconnection paths where the processing element is based on two 8-bit ripple adders and simple logic gates. This reconfigurable computation unit can be configured to perform special operations such as two 16/spl times/16-bit multiplication, sixteen 32-bit addition/subtraction, one 16-bit dot product and sixteen 8-bit absolute that utilize these 64 processing elements in different connection topologies to increase their usage rates. In the benchmark analyses, the 8/spl times/8-pixel motion estimation and 8/spl times/8-pixel discrete cosine transform are realized in the proposed reconfigurable DSP, TI TMS320C64 and MorphoSys. Additionally, the comparison of computation performances and hardware costs is performed to show that the proposed reconfigurable DSP is able to achieve a higher computation performance at a low hardware cost. Therefore, the reconfigurable DSP proposed herein can achieve high-efficiency computing for various multimedia applications.

关键词： Digital signal processors Multimedia computing Digital signal processing Reconfigurable logic High performance computing Hardware Costs Digital arithmetic Logic design Signal design

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Investigating the role of glottal features in classifying clinical depression

Investigating the role of glottal features in classifying cl...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： E. Moore M. Clements J. Peifer L. Weisser School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Nteractive Media Technology Center Georgia Institute of Technology Atlanta GA USA Department of Psychiatry and Behavioral Health Medical College Augusta GA USA

Classifying emotion and emotion related disorders in the voice have often been studied utilizing prosodic (pitch, energy, speaking rate) and other spectral characteristics (formants, power spectral density) of the acoustic speech signal. Glottal waveform features have received little attention in the study of many emotion and emotion related disorders, but have shown strong correlations in a variety of speech pattern studies including speaker characterization and stress analysis. We employ glottal extraction techniques to obtain features related to timing, ratios, shimmer, and spectral characteristics of the glottal waveform in the study of clinical depression. Our study reports on several glottal waveform features that show very good separation among a control group and patient group of males and females suffering from a depressive disorder.

关键词： Speech analysis Speech processing Acoustic waves Biomedical engineering Psychiatry Educational institutions Biomedical acoustics Loudspeakers Stress Pattern analysis

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Analysis of prosodic variation in speech for clinical depression

Analysis of prosodic variation in speech for clinical depres...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： E. Moore M. Clements J. Peifer L. Weisser School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Interactive Media Technology Center Georgia Institute of Technology Atlanta GA USA Department of Psychiatry and Behavioral Health Medical College Augusta GA USA

Understanding how someone is speaking can be equally important to what they are saying when evaluating emotional disorders, such as depression. In this study, we use the acoustic speech signal to analyze variations in prosodic feature statistics for subjects suffering from a depressive disorder. A new sample database of subjects with and without a depressive disorder is collected and pitch, energy, and speaking rate feature statistics are generated at a sentence level and grouped into a series of observations (subset of sentences) for analysis. A common technique in quantifying an observation had been to simply use the average of the feature statistic for the subset of sentences within an observation. However, we investigate the merit of a series of statistical measures as a means of quantifying a subset of feature statistics to capture emotional variations from sentence to sentence within a single observation. Comparisons with the exclusive use of the average show an improvement in overall separation accuracy for other quantifying statistics.

关键词： Speech analysis Statistics Psychiatry Educational institutions Statistical analysis Humans Data mining Time series analysis Databases Biomedical engineering

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Experiential telepresence: How can telepresence research be guided towards better end user experience?

Experiential telepresence: How can telepresence research be ...

引用

2003 ACM SIGMM Workshop on Experiential Telepresence, ETP '03

作者： Hayes-Roth, Barbara Henderson, Austin Jain, Ramesh Manovich, Lev Welch, Greg Pingali, Gopal Extempo Systems Inc. United States MIT United States Systems Laboratory in the Advanced Concepts and Technology Group of Pitney Bowes United States School of Electrical and Computer Engineering College of Computing Georgia Institute of Technology United States Department of Computer Science and Engineering University of Michigan Ann Arbor MI United States University of California San Diego CA United States Visual Arts Department University of California San Diego CA United States Computer Science Department University of North Carolina Chapel Hill NC United States IEEE Computer Society ACM United States IBM T.J. Watson Research Center 19 Skyline Drive Hawthorne NY 10532 United States

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Performance of a space-time block coded OFDM system

Performance of a space-time block coded OFDM system

引用

The Thirty-Sixth Asilomar Conference on Signals Systems and computers

作者： Yue, Jiang Gibson, Jerry D. Department of Electrical Engineering School of Engineering Southern Methodist University Dallas TX 75275 United States Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065 United States

Combined with antenna diversity, space-time coding is an attractive candidate for high-rate transmission systems such as orthogonal frequency division multiplexing (OFDM) systems. In this paper, we propose space-time block coded OFDM systems that use training symbols coded by STBC. We use two training symbols at the beginning of each of two OFDM frames that are simultaneously transmitted from two corresponding transmit antennas. Based on the orthogonality of space-time block codes, we perform channel estimation by using training symbols, and compare to EM-based channel estimation methods. From the simulation results, we observe that our space-time block coding technique offers a good approach to channel estimation and better signal quality than the EM-based method.

关键词： Orthogonal frequency division multiplexing

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Unit-cell modeling of high-speed interconnect with adjacent metal-filled via array using FDTD method

Unit-cell modeling of high-speed interconnect with adjacent ...

引用

6th IEEE Workshop on Signal Propagation on Interconnects, SPI

作者： Lee, Heeseok Park, Charlie Kam, Derek Kim, Joungho Terahertz Media and System Laboratory Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-1 Kusong Yusong Taejon 305-701 Korea Republic of

ISBN: (纸本)0780398211

The periodic structure modeling technique is employed to investigate the transmission line characteristic of the stripline with adjacent metal-filled via-array (SAMVA). The unit-cell modeling (UCM) using the finite-difference time-domain (FDTD) method was utilized to determine the full-wave effect on the propagation property of the high speed interconnecting structure defined by longitudinally periodic boundary condition in package and board level. UCM is the efficient modeling methodology for the periodic transmission line structure. Specifically, the slow wave effect of SAMVA will be discussed. © 2002 IEEE.

关键词： Finite difference time domain method

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Performance of a space-time block coded OFDM system

Performance of a space-time block coded OFDM system

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Asilomar Conference on Signals, Systems & computers

作者： Jiang Yue J.D. Gibson Department of Electrical Engineering School of Engineering Southern Methodist University Dallas TX USA Media Arts Technology Program and Electrical & Computer Engineering University of California Santa Barbara CA USA

Combined with antenna diversity, space-time coding is an attractive candidate for high-rate transmission systems such as orthogonal frequency division multiplexing (OFDM) systems. We propose space-time block coded OFDM systems that use training symbols coded by STBC. We use two training symbols at the beginning of each of two OFDM frames that are simultaneously transmitted from two corresponding transmit antennas. Based on the orthogonality of space-time block codes, we perform channel estimation by using training symbols, and compare to EM-based channel estimation methods. From the simulation results, we observe that our space-time block coding technique offers a good approach to channel estimation and better signal quality than the EM-based method.

关键词： OFDM Channel estimation Transmitting antennas Block codes Transmitters Diversity reception Fading Frequency conversion PROM Diversity methods

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Multiview registration of 3D scenes by minimizing error between coordinate frames 7th

Multiview registration of 3D scenes by minimizing error betw...

引用

7th European Conference on computer Vision, ECCV 2002

作者： Sharp, Gregory C. Lee, Sang W. Wehe, David K. Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Media Technology Sogang University Seoul Korea Republic of Department of Nuclear Engineering and Radiological Sciences University of Michigan Ann ArborMI48109 United States

ISBN: (纸本)9783540437444

This paper addresses the problem of large scale multiview registration of range images captured from unknown viewing directions. To reduce the computational burden, we decouple the local problem of pairwise registration on neighboring views from the global problem of distribution of accumulated errors. We define the global problem over the graph of neighboring views, and we show that this graph can be decomposed into a set of cycles such that the optimal transformation parameters for each cycle can be solved in closed form. We then describe an iterative procedure that can be used to integrate the solutions for the set of cycles across the graph. This method for error distribution does not require point correspondences between views, and therefore can be used together with robot odometry or any method of pairwise registration. Experimental results demonstrate the effectiveness of this technique on range images of an indoor facility. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Errors

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Range extension and short range performance enhancement in TDMA digital cellular

Range extension and short range performance enhancement in T...

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Asilomar Conference on Signals, Systems & computers

作者： Bo Wei J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Media Arts Technology Program and Electrical & Computer Engineering University of California슠Santa Barbara Santa Barbara CA USA

A new system enhancement method is proposed for the EIA/TIA-136 system offering both channel operational range extension and improved performance within the current operational range. The research presented investigates the application of the narrowband adaptive multi-rate (NB-AMR) speech codec and the wideband AMR (WB-AMR) codec, both originally designed for the 200 kHz GSM channel, in the TDMA (TIA/EIA-136) 30 kHz system. In particular, we investigate adaptively allocating bits between NB/WB speech coding and error control within the limited channel bandwidth. Four modes out of seventeen have been carefully chosen for the new TDMA/AMR system. Switching between codec rates as channel conditions change produces range extension below a C/I of 15 dB while also improving performance in the existing operational range above 15 dB. Time slot formats are unchanged so that the method is completely compatible with existing 136 systems.

关键词： Time division multiple access Speech codecs Speech coding Bit rate Channel coding Wideband Protection Degradation Fading Telecommunication standards

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