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检索条件"机构=Media Arts and Technology Program and Electrical and Computer Engineering"

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Signals and systems using MATLAB: An integrated suite of applications for exploring and teaching media signal processing

Signals and systems using MATLAB: An integrated suite of app...

引用

Frontiers in Education - 35th Annual Conference 2005, FIE' 05

作者： Sturm, Bob L. Gibson, Jerry D. Graduate Program 3431 South Hall University of California Santa Barbara Santa Barbara CA 93106 Department of Media Arts and Technology and Electrical and Computer Engineering

ISBN: (纸本)0780390776

Effectively teaching introductory media signal processing (MSP) to students requires a means of communicating complex concepts without advanced mathematics. At the media arts and technology program at UCSB we are teaching graduate media arts students concepts of MSP. These students, while interested in learning how their digital tools work, have an incredibly tough time working through the material the way traditional engineering students do. To address this we have used MATLAB to build a comprehensive suite of exploratory demonstrations and applications tailored to illustrate sophisticated concepts, and to inspire students that may not possess a strong background in mathematics. Our application, "Signals and Systems Using MATLAB" (SSUM), is presented here, and its use in a course designed to teach MSP to media arts students is discussed. Its usefulness extends beyond media arts to engineering and computer science curriculum. SSUM can be obtained for free from http://***/***. © 2005 IEEE.

关键词： Teaching

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A hybrid HMM/DPA adaptive gesture recognition method

引用

First International Symposium on Advances in Visual Computing, ISVC 2005

作者： Rajko, Stjepan Qian, Gang Dept. of Computer Science and Engineering Arizona State University Tempe AZ 85287 United States Dept. of Electrical Engineering Arizona State University Tempe AZ 85287 United States Arts Media and Engineering Program Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)3540307508

We present a hybrid classification method applicable to gesture recognition. The method combines elements of Hidden Markov Models (HMM) and various Dynamic programming Alignment (DPA) methods, such as edit distance, sequence alignment, and dynamic time warping. As opposed to existing approaches which treat HMM and DPA as either competing or complementing methods, we provide a common framework which allows us to combine ideas from both HMM and DPA research. The combined approach takes on the robustness and effectiveness of HMMs and the simplicity of DPA approaches. We have implemented and successfully tested the proposed algorithm on various gesture data. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Gesture recognition

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Signals and Systems using MATLAB: an integrated suite of applications for exploring and teaching media signal processing

Signals and Systems using MATLAB: an integrated suite of app...

引用

Frontiers in Education (FIE) Conference

作者： B.L. Sturm J.D. Gibson Department of Electrical and Computer Engineering and Media Arts & Technology (MAT) University of California슠Santa Barbara Santa Barbara CA USA

Effectively teaching introductory media signal processing (MSP) to students requires a means of communicating complex concepts without advanced mathematics. At the media arts and technology program at UCSB we are teaching graduate media arts students concepts of MSP. These students, while interested in learning how their digital tools work, have an incredibly tough time working through the material the way traditional engineering students do. To address this we have used MATLAB to build a comprehensive suite of exploratory demonstrations and applications tailored to illustrate sophisticated concepts, and to inspire students that may not possess a strong background in mathematics. Our application, "Signals and Systems using MATLAB" (SSUM), is presented here, and its use in a course designed to teach MSP to media arts students is discussed. Its usefulness extends beyond media arts to engineering and computer science curriculum. SSUM can be obtained for free from http://***/***

关键词： Signal processing MATLAB Art Application software Mathematics Digital signal processing engineering students computer science education Educational programs Signal processing algorithms

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Adaptive source and channel re-encoding to maximize tandem link performance

Adaptive source and channel re-encoding to maximize tandem l...

引用

2004 First International Symposium on Control, Communications and Signal Processing, ISCCSP 2004

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

ISBN: (纸本)0780383796

We investigate the issues in voice communications over tandem heterogeneous network connections which require multiple source decoding/encoding operations. While it is known from speech coding research that tandem connections of different speech coders can extract a substantial performance penalty, it is shown that the use of error concealment and source re-encoding can improve system performance in the presence of channel impairments such as bit errors and packet losses. A new protocol is proposed for wireless LANs that reduces retransmissions and discarded packets, and hence reduces system delay and facilitates packet loss concealment.

关键词： Signal encoding

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Joint semi-blind channel estimation and data detection for MIMO-OFDM systems

Joint semi-blind channel estimation and data detection for M...

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Proceedings of the IEEE 6th Circuits and Systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication

作者： Yue, Jiang Kim, Kyeong Jin Reid, Tony Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Nokia Research Center 6000 Connection Dr. Irving TX 75039 Media Arts and Technology Program Electrical and Computer Engineering University of California Santa Barbara Santa Barbara CA 93106-6065

ISBN: (纸本)0780379381

In MEMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse reponses are often assumed to be constant over a block or packet This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on NP subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over non-iteration.

关键词： Orthogonal frequency division multiplexing

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Robust bayesian cameras motion estimation using random sampling

Robust bayesian cameras motion estimation using random sampl...

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2004 International Conference on Image Processing, ICIP 2004

作者： Qian, Gang Chellappa, Rama Zheng, Qinfen Department of Electrical Engineering and Arts Media and Engineering Program Arizona State University Tempe AZ 85287-8706 Center for Automation Research Institute for Advanced Computer Studies University of Maryland College Park MD 20742-3275

In this paper, we propose an algorithm for robust 3D motion estimation of wide baseline cameras from noisy feature correspondences. The posterior probability density function of the camera motion parameters is represented by weighted samples. The algorithm employs a hierarchy coarse-to-fine strategy. First, a coarse prior distribution of camera motion parameters is estimated using the random sample consensus scheme (RANSAC). Based on this estimate, a refined posterior distribution of camera motion parameters can then be obtained through importance sampling. Experimental results using both synthetic and real image sequences indicate the efficacy of the proposed algorithm. ©2004 IEEE.

关键词： Motion estimation

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Adaptive source and channel re-encoding to maximize tandem link performance

Adaptive source and channel re-encoding to maximize tandem l...

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

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

We investigate the issues in voice communications over tandem heterogeneous network connections, which require multiple source decoding/encoding operations. While it is known from speech coding research that tandem connections of different speech coders can extract a substantial performance penalty, it is shown that the use of error concealment and source re-encoding can improve system performance in the presence of channel impairments such as bit errors and packet losses. A new protocol is proposed for wireless LANs that reduces retransmissions and discarded packets, and hence reduces system delay and facilitates packet loss concealment.

关键词： Decoding Speech coding Speech codecs Internet telephony Bit rate Nonhomogeneous media Art computer networks Performance loss System performance

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Joint semiblind channel estimation and data detection for MIMO-OFDM systems

Joint semiblind channel estimation and data detection for MI...

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Proceedings of the IEEE Circuits and Systems Symposium on Emerging Technologies

作者： Jiang Yue Kyeong Jin Kim T. Reid J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Nokia Research Center TX Nokia Research Center Irving TX USA Media Arts and Technology Program and Electrical & Computer Engineering University of California Santa Barbara Santa Barbara CA

In MIMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse responses are often assumed to be constant over a block or packet. This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on N/sub P/ subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost. The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over noniteration.

关键词： Channel estimation MIMO Receiving antennas Transmitting antennas Transmitters Degradation OFDM Iterative algorithms Computational efficiency Computational modeling

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Vehicle detection and tracking using acoustic and video sensors

Vehicle detection and tracking using acoustic and video sens...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： R. Chellappa Gang Qian Qinfen Zheng Center for Automation Research Institute for Advanced Computer Studies University of Maryland College Park MD USA Department of Electrical Engineering and Arts Media and Engineering Program Arizona State University Tempe AZ USA

Multimodal sensing has attracted much attention in solving a wide range of problems, including target detection, tracking, classification, activity understanding, speech recognition, etc. In surveillance applications, different types of sensors, such as video and acoustic sensors, provide distinct observations of ongoing activities. We present a fusion framework using both video and acoustic sensors for vehicle detection and tracking. In the detection phase, a rough estimate of target direction-of-arrival (DOA) is first obtained using acoustic data through beam-forming techniques. This initial DOA estimate designates the approximate target location in video. Given the initial target position, the DOA is refined by moving target detection using the video data. Markov chain Monte Carlo techniques are then used for joint audio-visual tracking. A novel fusion approach has been proposed for tracking, based on different characteristics of audio and visual trackers. Experimental results using both synthetic and real data are presented. Improved tracking performance has been observed by fusing the empirical posterior probability density functions obtained using both types of sensors.

关键词： Vehicle detection Acoustic sensors Target tracking Direction of arrival estimation Object detection Multimodal sensors Speech recognition Surveillance Acoustic signal detection Phase detection

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Voice transmission over all-IP tandem links

Voice transmission over all-IP tandem links

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Conference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and computers

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

We investigate the issues in voice communications using IP over tandem connections of wireline and wireless links with the goal of determining end-to-end system performance. We study the particular example of using G.711 speech coding in the backbone wireline network and Adaptive Multi-rate (AMR) speech coding in a wireless LAN tandem network and study the impact of specific methods of adaptive re-encoding, error concealment, error control coding, and network protocol design to deliver the desired end-to-end quality of service. In addition to simulation results and objective speech quality measures, we present estimation-theoretic and information-theoretic analyses for the tandem packet loss link connections.

关键词： Telecommunication links

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