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SPEECH ENHANCEMENT BASED ON A COMBINED HIGHER FREQUENCY REGENERATION TECHNIQUE AND RBF NETWORKS

SPEECH ENHANCEMENT BASED ON A COMBINED HIGHER FREQUENCY REGE...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Takahiro Murakami Munehiro Namba Tetsuya Hoya Yoshihisa Ishida Department of Electronics and Communication Meiji University 1-1-1 Higashi-Mita Tama-Ku Kawasaki 214-8571 Japan Department of Mathematics and Informatics Tokyo Gakugei University 4-1-1 Nukuikitamachi Koganei-City Tokyo 184-8501 Japan Laboratory for Advanced Brain Signal Processing BSI-RIKEN 2-1 Hirosawa Wakoh-City Saitama 351-0198 Japan Department of Electronics and Communication Meiji University 1-1-1 Higashi-Mita Tama-Ku Kawasaki 214-8571 Japan

In this paper, we propose a new methodfor noise reduction in speech signals. In the method,the nonlinear spectral subtraction (NSS) method is ap-plied to the down-sampled noisy speech signal. Then,the proposed method restores the missing higher fre-quency components from the narrow-bandwidth en-hanced speech signal in order to improve the subjectivespeech quality. For recovering the broad-bandwidthspeech signal, the proposed method exploits the radialbasis function (RBF) network, which is one of the well-known models of artificial neural netwoks.

关键词： speech enhancement higher frequency regeneration RBF networks

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Color Image Watermarking Based on DCT-Domains of Color Channels

Color Image Watermarking Based on DCT-Domains of Color Chann...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Zheng Jiang-bin ZhangYan-ning Feng Da-gan Zhao Rong-chun Dept. of Computer Science and Engineering, Northwestern Polytechnical University. Xi'an 710072 Dept. of Electronic and Information Engineering, Hong Kong Polytechnic University. Hong Kong China

Digital watermarking has been proposed as a methodfor discouraging illicit copying and distribution of copyrightedmaterial. Now, there are many watermarking schemes for stillcolor images, we present an approach for embedding digitalwatermarking information into color channels DCT (Discretecosine transforms) domains of the image. We observe that thecorrelation value between the color channels DCT coefficients issatisfied with some kind of statistical regular, by means of thisstatistical regular, we can modify the selected sets of DCTcoefficients to make the correlation values show specificdistribution, so that we can embed a binary string into the ***, the embedded watermarking is extracted withoutresorting to original image and any other data sets. Experimentalresults demonstrate that the watermark is robust to most of theimage and signal processing techniques, and also our schemes areshown to provide very good results both in terms of imagetransparency and robustness.

关键词： Copyright protection digital watermarking DCT color image

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Learning Bayesian Network Classi■ers from Data with Missing Values

Learning Bayesian Network Classi■ers from Data with Missing...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Hongwei Zhang Yuchang Lu State Key Laboratory of Intelligent Technology&Systems Department of Computer Science&Technology Tsinghua University Beijing 100084 China

Learning accurate Bayesian network (BN) classifiers fromcomplete databases is a very active research topic in DataMining and Machine Learning. However, in practice, databasesare rarely complete. This affects their real world data min-ing applications. This paper investigates the methods forlearning four types well-known Bayesian network classifiersfrom incomplete databases. These four types BN classifiersare: Naive-Bayes, Tree augmented Naive-Bayes, BN aug-mented Naive-Bayes, and general BN, where the latter twoare learned using dependency analysis based algorithms thatwork only on the Database Completeness assumption. Inorder to enable this kind algorithms to handle with missingdata, this paper introduces a novel deterministic methodto estimate the (Conditional) Mutual Information from in-complete databases, which can be used to do CI tests, afundamental step in the dependency analysis based algo-rithms. The experimental results show that our algorithmis efficient and reliable.

关键词： Bayesian Network Classifier Data Mining Incomplete data

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A CPX8216 HARDWARE SYSTEM BASED GPRS INTER-BROAD HANDOFF ALGORITHM

A CPX8216 HARDWARE SYSTEM BASED GPRS INTER-BROAD HANDOFF ALG...

引用

2002年ieee十区计算机、通信、控制和电机工程会议

作者： Ming LI Wujun LAI Jie MIN Zailu HUANG Department of electronics and information engineering, Huazhong university of science and technology, Wuhan China 430074 EE department, University of Xiamen,Xiamen China 361005

General Packet Radio Service (GPRS) is anenhancement to existing GSM networks that introduceshigh-speed packet data transmission. A inter-broad handoffmay happen when a routing area update request is received bySGSN if GPRS system is implemented by distributedprocessing system like CPX8216 hardware system. Twoperformance metrics of inter-broad handoff expectedinter-broad overload probability and expected handoff numberare presented. A optimal handoff algorithm for inter-broadhandoff is the best tradeoff between interbroad performanceand expected handoff number. According to the definition ofadaptive handoff algorithm in [3],we proposed a adaptiveinter-broad handoff algorithm. Simulation results show thatcomparing with the inter-broad handoff algorithm with fixedthreshold. the adaptive handoff algorithm we proposed hasless expected handoff number at the same overloadprobability.

关键词： GPRS handoff inter-broad handoff adaptive handoff

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Efficient Image Compression based on combination of Fuzzy- Fractal theory

Efficient Image Compression based on combination of Fuzzy- F...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Kya Berthe Information Engineering School University of Science and Technology Beijing post code 100083 China

Fractal image compression has received muchattention from the research community because of somedesirable properties like resolution independence, fastdecoding and very competitive rate-distortion curve [1].Though the progress made in fractal compression, the longencoding times still remain the main drawback of thistechnique, which result from the need of performing a largenumber of range-domain matches. The total encoding timeis the sum of the time required to perform each match. Thereduction of the encoding time lead to minimize theformula‖r-(s d+o l‖～2 （1）.Where s,o are respectively the luminance andcontrast of the domain block d r is the range *** methods have been proposed in order tospeed-up fractal image coding [2]. An efficiency fuzzyalgorithm base of fuzzy comparison of the featuredistance between each range and domain block has beenprovided to speed-up the encoding time, without thedegradation of the image quality. The proposal methodhas been compared to the general fractal coding method[1, 3] for testing it efficiency.

关键词： Fractal compression fuzzy logic fuzzy homogeneity criterion Hybrid fractal-fuzzy compression

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Active Force Control of a 5-Link Biped Robot

Active Force Control of a 5-Link Biped Robot

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： L.C.Kwek C.K.Loo E.K.Wong M.V.CRao M.Mailah Faculty of Engineering and Technology Multimedia University.Jalan Aver Keroh Lama 75450 Melaka Malaysia. Faculty of Engineering and Technology Multimedia University.Jalan Aver Keroh Lama 75450 Melaka Malaysia. Faculty of Engineering and Technology Multimedia University.Jalan Aver Keroh Lama 75450 Melaka Malaysia. Faculty of Engineering and Technology Multimedia University.Jalan Aver Keroh Lama 75450 Melaka Malaysia. Faculty of Mechanical Engineering University Technology of Malaysia 81310 Skudai.Johor.Malaysia

The performance of the biped system under the applicationof Active Force Control (AFC) is evaluated by making thebiped walk on a horizontal plane surface, in which thelocomotion is constrained within the sagittal plane. Thedynamic equations Jot a biped are nonlinear and highlycoupled, and hence the biped does not perform well withthe pure PD control. The effectiveness of the proposedmethod (Active Force Control with Crude Approximation-AFC-CA) is investigated and it is found that the system isrobust and stable even under the influence of disturbances.

关键词： Biped Proportional-Derivative Active Force Control Crude Approximation

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Analog Implementation of BRIN for optimization problems

Analog Implementation of BRIN for optimization problems

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： H.S.NG K.P.LAM Department of Sys. Engg. & Engg. Mgt. The Chinese University of Hong Kong Shatin N.T. Hong Kong China Department of Sys. Engg. & Engg. Mgt. The Chinese University of Hong Kong Shatin N.T. Hong Kong China

The binary relation inference network (BRIN) showspromise in obtaining the global optimal solution in a timeindependent of the problem size. However, the realization of thismerge is depended on the implemation platforms. In this paper,analog implementation of BRIN for two different directed graphproblems is studied. As transitive closure problems can transformto a special case of shortest path problems or a special case ofmaximum spanning tree problems, two different forms of BRIN arediscussed. Their circuits using common analog integrated circuitsare investigated. Also, the BRIN solution for critical path problemsis expressed. It is implemented using the separated building blockcircuit and the combined building block circuit. As these circuitsare different, the response time of the network will be ***,a simple circuit does not promise to give a faster solutiontime for BRIN.

关键词： Connectionist Network Optimization problem Analog Circuit Dynamic Programming

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Uncertainty Estimation of Measurement Using a Vector Network Analyzer

Uncertainty Estimation of Measurement Using a Vector Network...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Jun-young Park Sung-kyo Park Jang-won Moon Chong-baek Park KORA #375 seosuk-dong Kwang-ju Republic of Korea School of EICE Chosun University #375 seosuk-dong.Kwang-iu.Republic of Korea Graduate School Chosun University #375 seosuk-dong Kwang-ju Republic of Korea School of EICE Chosun University #375 seosuk-dong Kwang-ju Republic of Korea

In this study, we proposed aspecification which is able to estimate theuncertainty more easily and quickly and alsoable to maintain a confidence level whenmeasuring the magnitude and phase of 1-portand 2-port transmission reflection coefficientusing a VNA and attached coaxial cable probes. This proposed specification is available whenit needs extra special condition of uncertaintyestimation and when there is no additionalstandard equipment like as beadless airline ormismatch standard at the measurement *** compared and examined this proposeduncertainty estimation method with recommendedEA specification and Agilent specification. As a result, we think that this proposedspecification can be used as a reference foruncertainty estimation and calculation of VNAsystem, that is, a reference based on theISO/IEC 17025 requirements.

关键词： VNA Uncertainty Estimation of Measurement Using a Vector Network Analyzer Vector

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Real Time Head Tracking and Face and Eyes Detection

Real Time Head Tracking and Face and Eyes Detection

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Beng Hai Lee Menaka Rajapakse Laboratories for Information Technology 21 Heng Mui Keng Terrace Singapore 119613 Laboratories for Information Technology 21 Heng Mui Keng Terrace Singapore 119613

This paper presents a novel algorithm to detect faceand eyes in a reliable manner with a stereo *** the combination of stereo tracking method for ob-ject detection and tracking and structure-based methodand exainple-based learning approach for face detec-tion, a real time and robust system is built, Humanhead detection is implemented with a stereo vision sys-tem, where a layered scenery is obtained from the depthimage. With head-shoulder contour model applied tothe disparity image, a fast head detection algorithm isdeveloped. On the head detected, which also tells therough scale of it, a hybrid face detection algorithm isproposed for face pattern detection and eyes *** applying the face structure model and facial com-ponents model, face candidates in images are obtainedfor the later validating of face pattern. Support vectormachine (SVM) is adopted here to select the good sam-ples that will form a classification boundary to classifyface and non-face patterns.

关键词： Real Time Head Tracking and Face and Eyes Detection

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Design and Implementations of a Software Defined Radio Scheme Based Modem for High-Speed Multimedia Data Service

Design and Implementations of a Software Defined Radio Schem...

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2002年ieee十区计算机、通信、控制和电机工程会议

作者： Byeong-Gwon Kang Dept. of Information Technology Engineering Soonchunhyang University Eupnae-ri 646 Shinchang-myun Asan-si Choongnam Korea

In recent years, there is much attentionon software defined radio(SDR) schemes for highspeed multimedia applications in near future. It isrequired that the SDR system is flexible enough tosupport multiple air interfaces and signalprocessing functions at the same time. And also,digital signal processors and FPGAs are widelyused for implementation of these adaptive andflexible functions of a baseband modem for SDRapplications. Meanwhile, it is known that themodulation schemes of OCQPSK (OrthogonalComplex QPSK) and HPSK (Hybrid PSK) are usedfor IMT-2000 services of synchronous systems andasynchronous sysems, respectively. Thus, wedesign and implement an OCQPSK / HPSK modemusing a DSP chip with consideration of SDRconcepts. One modulation scheme is operated byadaptive selection between the two schemes and 5physical traffic channels differentiated byorthogonal codes are implemented in one DSP chipand each channel has 1Mbps data rates and 8Mcpschip rates.

关键词： DSP CPU WCDMA Modem Radio Design and Implementations of a Software Defined Radio Scheme Based Modem for High-Speed Multimedia Data Service

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