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Student Conference on Research and Development, SCOReD 2003

作者： Sahbudin, R.K.Z. Hooi, Lee Choong Guan, Tan Chin Liet, Ling Song Department of Computer and Communication System Engineering Faculty University Putra Malaysia Selangor Darul Ehsan43400 Malaysia

ISBN: (纸本)0780381734

This paper presents a room access monitoring system, which integrates computer and microcontroller MOTOROLA MC68HC1 1A8. Assembly language is used to program the microcontroller and Visual Basic 6 (VB) is used to develop the monitoring system. The monitoring system is divided into server side program (Eyewatch) and client side program. The server side program will inform the user about the door status - Through the client side program. The purpose to develop client side program is to enable user far apart from the door, know the status whether the door is block or not. The microcontroller is integrated with a keypad and LCD display. Only an authorized person can enter the room. If an unauthorized person trying to break through the door, an alarm will be activated. © 2003 IEEE.

关键词： Microcontrollers

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Comparing speech compression using wavelets with other speech compression schemes

Comparing speech compression using wavelets with other speec...

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Student Conference on Research and Development, SCOReD 2003

作者： Syed, A.R. Najih, AbduI Mawla M.A. Ramli, Abdul Rahman Ibrahim, Azizah Multimedia and Imaging Systems Research Group Department of Computer and Communication System Engineering University Putra Malaysia Serdang43400 Malaysia

ISBN: (纸本)0780381734

Speech compression is one area of digital signal processing that focusing on reducing the bit rate of the speech signal for transmission or storage without significant loss of quality. In recent years a new technique called wavelet transform has been proposed for signal analysis. It has been successfully used in image compression application. So far, less attention has been paid to the research in the speech compression . using wavelet. This paper attempts to evaluate the wavelet compression technique on speech signals Different wavelet filters were used to select the best filter suitable for speech signal in providing low bit rate and IOW computation complexity. Our implementation was evaluated base on PSNR, SNR, NRMSE and compression ratio tested on 8 kHz bit speech signals. This algorithm was also compared to the following speech compression schemes: Linear Productive Coding (LPC) which reduces the transmitted data by factor of more than twelve, and Global system Mobile (GSM) which reduces the transmitted data by factor of five As a result from this study, wavelet speech compression gives higher SNR and better speech quality than the other techniques. © 2003 IEEE.

关键词： Wavelet transforms

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Comparing speech compression using wavelets with other speech compression schemes

Comparing speech compression using wavelets with other speec...

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Student Conference on Research and Development (SCOReD)

作者： A.M.M.A. Najih A.R. Ramli A. Ibrahim A.R. Syed Department of Computer and Communication System Engineering University Putra Malaysia Serdang Malaysia Department of Computer and Communication System Engineering University Putra Malaysia Serdang

Speech compression is one area of digital signal processing that focuses on reducing the bit rate of the speech signal for transmission or storage without significant loss of quality. In recent years a new technique called wavelet transform has been proposed for signal analysis. It has been successfully used in image compression application. So far, less attention has been paid to the research in the speech compression using wavelet. This paper attempts to evaluate the wavelet compression technique on speech signals. Different wavelet filters were used to select the best filter suitable for speech signal in providing low bit rate and low computation complexity. Our implementation was evaluated based on PSNR, SNR, NRMSE and compression ratio tested on 8 kHz 8-bit speech signals. This algorithm was also compared to the following speech compression schemes: linear predictive coding (LPC) which reduces the transmitted data by factor of more than twelve, and global system mobile (GSM) which reduces the transmitted data by factor of five As a result from this study, wavelet speech compression gives higher SNR and better speech quality than the other techniques.

关键词： Image coding Speech coding Speech processing Bit rate Speech analysis Filters Linear predictive coding Digital signal processing Signal processing Propagation losses

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Room access monitoring system

Room access monitoring system

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Student Conference on Research and Development (SCOReD)

作者： R.K.Z. Sahbudin Lee Choong Hooi Tan Chin Guan Ling Siong Liet Department of Computer and Communication System Engineering Faculty Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Computer and Communication System Engineering Faculty University of Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

This paper presents a room access monitoring system, which integrates computer and microcontroller MOTOROLA MC68HC11A8. Assembly language is used to program the microcontroller and Visual Basic 6 (VB) is used to develop the monitoring system. The monitoring system is divided into server side program (Eyewatch) and client side program. The server side program informs the user about the door status through the client side program. The purpose to develop client side program is to enable user far apart from the door, know the status whether the door is block or not. The microcontroller is integrated with a keypad and LCD display. Only an authorized person can enter the room. If an unauthorized person trying to break through the door, an alarm will be activated.

关键词： Microcontrollers computerized monitoring Liquid crystal displays Buildings communication system control Magnetic sensors systems engineering and theory Assembly systems Visual BASIC Cities and towns

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Reduced-order controllers for the discrete-time H/sub /spl infin// control problem with unstable invariant zeros

Reduced-order controllers for the discrete-time H/sub /spl i...

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American Control Conference (ACC)

作者： Xin Xin Department of Communication EngineeringFaculty of Computer Science and System Engineering Okayama Prefectural University Okayama Japan

ISBN: (纸本)0780378962

This paper addresses the existence and design methods of reduced-order controllers for the discrete time H/sub /spl infin// control problem with unstable invariant zeros in the state-space realization of the transfer function matrix from the control input to the controlled error or from the exogenous input to the observation output, where the realization is induced from a stabilizable and detectable realization of the generalized plant. This paper presents new controller degree bounds for the H/sub /spl infin// control problem and provides new solutions to designing of reduced-order controllers for the H/sub /spl infin// control problem with invariant zeros located outside of the open unit disk. When such unstable invariant zero exists (even it is a zero on the unit circle), this paper shows that reduced-order controllers with strictly orders less than the generalized plant order exist if the H/sub /spl infin// control problem is solvable. Two LMI based design methods for constructing the reduced-order controllers are given. Furthermore, this paper shows that the results obtained here unify previous special results of reduced-order controllers for the H/sub /spl infin// control problems with infinite zeros, or unstable real transmission zeros, etc.

关键词： Control systems communication system control Filtering theory Design engineering Design methodology Transfer functions Error correction computer science systems engineering and theory Ear

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Web-based network device management using SNMP servlet

Web-based network device management using SNMP servlet

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National Conference on Telecommunication Technology (NCTT)

作者： M.J. Hossen A.R. Ramli M.K. Abdullah Faculty of Engineering Department of Computer and Communication System Engineering Multimedia and Imaging System Laboratory Universiti Putra Malaysia Selangor Darul Ehsan Malaysia

As the complexity and size of data networks increases, network management faces a great challenge. Fortunately, the emergence of the SNMP (simple network management protocol) management framework and Web technology release network managers from the difficult circumstance. The paper explains the function and design of a prototype network device management station based on leading-edge Java servlet technologies and the World Wide Web. Web technologies bring valuable cost improvements, flexibility, and security enhancement to configuration management and performance management. The paper also discusses the functional requirements of Web-based network management and proposes the architecture for Web-based network configuration management, which is capable of controlling and monitoring remotely the configuration information of enterprise networks.

关键词： Disaster management Technology management Protocols Prototypes Java Paper technology Web sites Costs Information security Remote monitoring

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DCM/Diff.D: A threshold-less and dynamic decision making receiver design for improved transmission performance

DCM/Diff.D: A threshold-less and dynamic decision making rec...

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Asia-Pacific Conference on communications

作者： N. Abbas M.K. Abdullah A.F. Abas Facutly of Engineenng UPM 43400 Serdang Computer and Communication System Engineering Department Photonics Laboratory Selangor Malaysia

The simulation results and analysis of a novel transmission technique namely double carrier modulation/differential detection are presented, we show how the differential detection technique improves the system performance significantly, we also demonstrate that this technique overcomes the problems associated with voltage threshold in conventional systems, and how it suggest the possibility to double up the conventional long distance without amplifiers with a BER of as good as 10/sup -13/ at 2.5 Gbps over 150 Km distance with 0 dBm transmit power. The new scheme also shows a much slower degradation with distance than that of conventional IM/DD system.

关键词： Decision making Optical noise Photodetectors Optical receivers Threshold voltage Bit error rate Degradation Phase detection Photonics Laboratories

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An algorithm to evaluate the L∞norm for some common filters

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IEEE Transactions on Acoustics, Speech, and Signal Processing 2003年第2期25卷 193-194页

作者： B. Gaffney J. Gowdy Government and Communication System Division RCA Corporation Moorestown NJ USA Department of Electrical and Computer Engineering Clemson University Clemson SC USA

The L ∞ norm is used in some algorithms to determine the ordering of the pole-zero sections of cascade digital filters. This note develops simple expressions that easily evaluate the L ∞ norm entirely in the Z-domain for filters having zeros on the unit circle (i.e., Butterworth, Chebyshev, and elliptic digital filters designed using the bilinear Z-transformation).

关键词： Digital filters Filtering theory Chebyshev approximation Poles and zeros Transfer functions computer aided software engineering Band pass filters Government Acoustics Speech processing

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Stereo obstacle detection method for a hybrid omni-directional/pin-hole vision system

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5th Robot World Cup Soccer Games and Conferences, RoboCup 2001

作者： Adorni, Giovanni Bolognini, Luca Cagnoni, Stefano Mordonini, Monica Department of Computer Engineering University of Parma Italy Department of Communication Computer and System Sciences University of Genoa Italy

ISBN: (纸本)3540439129

This paper describes an application of a vision system based on the use of both an omnidirectional vision sensor and a standard CCD camera. Such a hybrid sensor permits implementation of peripheral/foveal vision strategies, that can be very useful for navigation tasks. This paper focuses particularly on the use of the device as a stereo vision system to locate obstacles in a semi-structured environment through a perspective removal algorithm. © 2002 Springer-Verlag Berlin Heidelberg.

关键词： CCD cameras

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A dilation of transfer matrices with infinite and finite imaginary axis zeros 15th

A dilation of transfer matrices with infinite and finite ima...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Xin, Xin Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama719-1197 Japan

ISBN: (纸本)9783902661746

For a non-square transfer matrix with zeros on the extended imaginary axis including infinity, this paper discusses how to dilate (augment) such transfer matrix to a square one without adding extra zeros on the extended imaginary axis. The state-space construction for the dilation is proposed by using the finite and infinite eigenstructures of the transfer matrix. Copyright © 2002 IFAC.

关键词： Transfer matrix method

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