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International Symposium on signal processing and Its Applications (ISSPA)

作者： P. Lozo Weapons Systems Division Aeronautical and Maritime Research Laboratory Defence Science and Technology Organisation Salisbury SA Australia Department of Electrical and Electronic Engineering University of Adelaide Adelaide SA Australia Cooperative Research Centre for Sensor Signal and Information Processing SA Australia

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A radio transmitter fingerprinting system ODO-1

A radio transmitter fingerprinting system ODO-1

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Canadian Conference on electrical and computer engineering (CCECE)

作者： J. Toonstra W. Kinsner Dept. of Electr. & Comput. Eng. Manitoba Univ. Winnipeg Man. Canada Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg MAN Canada

This paper presents a new method for the capture, analysis, and classification of radio transmitter transients. This method involves the use of a capturing subsystem consisting of an Icom IC-R7000 communications receiver and a Sound Blaster 16 sound card running on a PC. The radio transients are sampled at 44,100 samples per second and have 16 bits accuracy. Once the transmitter transient has been captured, a genetic algorithm selects the critical features from the wavelet coefficients for classification. The selected wavelet coefficients are considered to be fingerprints, and are presented to a back propagation neural network for transmitter classification. The capturing and analysis system, ODO-1, is able to classify both transients of the same model type as well as individual transmitters with 100% accuracy on a small data base of transmitter fingerprints.

关键词： Radio transmitters Fingerprint recognition Transient analysis Genetic algorithms Wavelet analysis Loudspeakers Wavelet coefficients Neural networks Frequency synthesizers Algorithm design and analysis

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Neural Circuit For Self-regulated Attentional Learning In Selective Attention Adaptive Resonance Theory (saart) Neural Networks

Neural Circuit For Self-regulated Attentional Learning In Se...

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International Symposium on signal processing and Its Applications (ISSPA)

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Adaptive soft limiter bootstrap separator for one-shot asynchronous CDMA channel with singular partial cross-correlation matrix

Adaptive soft limiter bootstrap separator for one-shot async...

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IEEE International Conference on Communications (ICC)

作者： N. Sezgin Y. Bar-Ness Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA New Jersey Institute of Technology Newark NJ US Dept. of Electr. & Comput. Eng. New Jersey Inst. of Technol. Newark NJ USA

The adaptive bootstrap separator has been shown to perform better than the conventional decorrelation detector when used for synchronous code division multiple access (CDMA) channels, or with a one-shot matched filter bank for asynchronous channels when the cross-correlation of the partial sequences is nonsingular. In the later case, however, when the "partial cross-correlation" is singular, the separator weights fail to converge. We propose the use of a soft-limiting decision instead of a hard limiter for controlling the adaptive weights of the separator. We show that the algorithm weights converge, provided that the limiting threshold is not zero or not very large. Due to analytical difficulties, the actual steady state weights are not found, but are shown to exist. Simulation results support these claims. The bit error rate (BER) performance of the adaptive soft limiter bootstrap separator are also found by simulation and compared to the performance of the conventional decorrelator that uses the pseudoinverse of the cross-correlation matrix.

关键词： Particle separators Decorrelation Multiaccess communication Bit error rate Detectors Matched filters Weight control Programmable control Adaptive control Steady-state

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Detection of the complex amplitude distribution of a kinoform using an iterative Fourier-transform algorithm

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第1期79卷 11-21页

作者： Akahori, H Faculty of Engineering Kanagawa Institute of Technology Atsugi Japan 243-02 Graduated in 1963 from the Department of Electrical Engineering Tokyo Institute of Technology and joined the Electrotechnical Laboratory of the Ministry of International Trade and Industry. Later he obtained a Dr. of Eng. degree. In 1987 he became a Professor in the Department of Information and Computer Sciences Kanagawa Institute of Technology. He has been engaged in research on optical information processing and digital holography.

This paper presents a method for recovering, by using the iterative Fourier-transform algorithm, the complex amplitude transmittance of a recorded one-dimensional Fourier transform-type kinoform. A method for estimating the phase-recording characteristic of the kinoform fabrication system by comparing the retrieved phase with the theoretical phase is also presented. The spatial variations of both the magnitude and phase inside each of the kinoform cells were evaluated to improve estimation of the phase-recording characteristic. The initial estimate of the kinoform phase given to the algorithm was derived using the knowledge that the recorded phase is an approximation of the phase to be recorded. The relationship between the shift of the central sampling point of the Fourier image from the optical axis and the retrieved phase of the kinoform is investigated;a kinoform phase pattern with a structure suitable for indirectly detecting the shift is then proposed. In an experiment using a kinoform fabrication system including a photographic process, the recorded phase distribution is retrieved at five sampling points of each cell. The phase-recording characteristic is estimated using the retrieved phase values. Next, a computer simulation is executed to reveal the influence of errors in the measurement of magnitude. The simulation result shows that the recorded phase distribution can approximately be retrieved when the rms error added to the magnitude is approximately 10 percent of its average. Furthermore, the validity of the phase distribution retrieved in the experiment is discussed.

关键词： Kinoform Gerchberg-Saxton algorithm phase retrieval phase-recording characteristic

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A hypermedia-based design image database system using a perceptional link method

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Journal of Management Information Systems 1996年第3期13卷 25-43页

作者： Shibata, Y. Fukuda, M. Katsumoto, M. University of California Los Angeles CA United States Computer Science Department United States Bell Communication Research United States Dept. of Info. and Computer Science Toyo University Japan ACM Info. Processing Society of Japan Inst. Electron. Commun. Eng. Japan Japan Toyo University Japan Department of Electrical Engineering IPSJ Japan Communication Research Laboratory Japan. Min. P. and Telecommunication Japan IPSJ IEICE IEEE Computer Society Japan

We introduce a hypermedia-based distributed design image database system that can provide simple and flexible user access capabilities based on the "kansei" link method. As proof of this concept, we have developed a prototype distributed multimedia information network incorporating the DHS model. Dubbed the Textile Design Image Database System (TDIDS), this database aids designers using apparel computer-aided design (CAD) systems in different locations, collaborating or working separately, in the design of clothes, including kimonos. Our purpose has been to create a database that will allow each designer to make the best use of his or her creativity and originality-his or her "style and sensitivity to beauty," or, in Japanese, kansei. In our hypermedia system, "metanodes" are defined as abstract nodes that are dynamically organized by multimedia objects, while "metalinks" are defined as flexible kansei links. Metanodes and metalinks are combined to organize a dynam ic hypermedia space from which users can easily retrieve desired design image objects by querying a knowledge agent. The knowledge agent, utilizing the knowledge base, creates links from kansei word objects provided by the user to suitable design image objects among those stored on multimedia databases distributed across the network. The knowledge agent also performs query conversion of individual users' subjective kansei (idiosyncratic, subjective use of kansei words) into objective kansei words using each user's own "user model," These objective kansei words are then converted to equivalent color values. Color value is the means by which all stored design images are characterized. This dynamic linking of kansei word objects to equivalent design images allows individual users' kansei to influence the retrieval process. The sophisticated and flexible CAD systems of the future will require multimedia database systems with cooperative supporting capabilities similar to our kansei system.

关键词： Design databases Hypermedia Image datatbases Perceptional retrieval

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Application of running quantities for control of an adaptive hybrid compensator

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EUROPEAN TRANSACTIONS ON electrical POWER 1996年第5期6卷 337-344页

作者： Czarnecki, LS Chen, G Staroszczyk, Z Guangda Chen (1953) received the B.S. and M.S. degrees from the Wuhan University of Hydraulic and Electrical Engineering China in 1977 and 1988 respectively. Since 1993 he worked for three years at the Department of Electrical and Computer Engineering Louisiana State University Baton Rouge USA as a Visiting Research Associate. Presently he is with Wuhan University of Hydraulic and Electrical Engineering China. His research interests include control systems powerquality improvement and power electronics. (University of Hydraulic and Electrical Engineering Wuhan. Hubei 430072 P.R. China T+8627/78822 12 ext. 3634) Dr. Zbigniew Staroszczyk (1952) received the M.Sc. and Ph.D. degrees in Telecommunications and Electrical Engineering from Warsaw University of Technology Poland in 1974 and 1984. respectively. He is an Assistant Professor at the Electrical Engineering Department of Warsaw University offechnology. His current research interests include digital signal processing oriented to high accuracy spectral analysis and digital filtering. He develops intelligent measuring instrumentation in that field. (Warsaw University of Technology Institute of the Theory of Electrical Engineering and Electrical Measurements Koszykowa 75 PL-00-66 I Warsaw/Poland T+482/6210070-7484 Fax+48 221292962)

A control algorithm for a hybrid compensator based on a concept of running complex RMS values of the fundamental harmonic of voltages and currents is presented in the paper. The hybrid compensator is composed of an adaptive passive balancing compensator controlled in the frequency-domain, and a current source, controlled in the time-domain. The algorithm used for the compensator control is rooted in a new approach to the power theory of electrical systems with quasi-periodic waveforms. it is based on the concept of running quantities and a forward extrapolation of the power properties of a time-variant load. Experimental results obtained using such an algorithm for controlling a laboratory prototype of the hybrid compensator are presented in the paper.

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A high-speed high-density array-multiplier-accumulator for digital signal processing

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第2期79卷 86-97页

作者： Minami, T Kasai, R Matsuda, H Kusaba, R Member NTT LSI Laboratories Atsugi Japan 243-01 Graduated in 1980 from the Department of Electrical Engineering Kyushu University where he received his Master's degree in 1982 and joined NTT. Until March 1986 he was engaged in the development of application software for electronic switching systems. He then engaged in research and development of LSIs for image signal processing. At present he is Senior Research Engineer Advanced LSI Laboratory NTT LSI Laboratories. He is a member of IEEE. Graduated in 1972 from the Department of Electrical Engineering Osaka University where he received his Master's degree in 1974 and his Ph.D. in 1992. He joined NTT in 1974. He is engaged in research and development of analysis of MOS devices and design of ASIC for communication. At present he is Executive Research Engineer Advanced LSI Laboratory NTT LSI Laboratories. He is a member of IEEE. Graduated in 1987 from the Department of Communications Tohoku University where he received his Master's degree in 1989 and joined NTT. He is engaged in research and development of high-speed design for image processing LSIs. At present he is Research Engineer Advanced LSI Laboratory NTT LSI Laboratories. He is a member of the Information Processing Society. Graduated in 1985 from the Department of Electrical Engineering Keio University where he received his Master's degree in 1987 and joined NTT. He is engaged in CAD research. At present he is Senior Research Engineer Advanced LSI Laboratory NTT LSI Laboratories. He is a member of the Information Processing Society and IEEE.

This paper discusses the downsizing and speed improvement of short-word multiplier-accumulators, which are frequently used in digital signal processors. As a first step, the optimal configuration for an array-type carry-save adder is considered where the shortest path in the full-adder is used to propagate the sum signal and the carry signal is sent to the full-adder of the two lower stages by skipping a stage. A configuration of the full-adder suitable for the structure is proposed. The case of eight partial product additions shows that the delay can be reduced by 22 percent compared to a simple array-type carry-save adder. Then the short-word carry look-ahead adder using the pass-transistor logic is considered. It is shown that a single-stage carry look-ahead circuit with a four-bitwise iterative structure exhibits nearly the same delay as a two-stage carry look-ahead circuit. In other words, the former is better suited to downsizing. This paper intends to examine the effectiveness of the foregoing new array-type carry-save adder and the single-stage carry look-ahead circuit using the 0.5-mu m CMOS technology. A 16-bit x 14-bit + 31-bit multiplier-accumulator has been designed and is evaluated for cases where the array-type carry-save adder is used to handle accumulation as well as partial products. The resulting area and delay are 0.77 x 0.78 mm(2) and 6.8 ns, respectively. The effectiveness of the approach used in this paper is evaluated by constructing a multiplier-accumulator, but the method is also useful in constructing a multiplier.

关键词： product-sum operation array multiplier carry-save adder full-adder carry look-ahead adder

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Wavelet transform-based signal waveform discrimination for inspection of rotating machinery

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electrical engineering IN JAPAN 1996年第2期117卷 80-92页

作者： Tamaki, K Matsuoka, Y Uno, M Kawano, T Hitachi Ltd. Received his Master's degree in 1986 in Electrical Engineering from Keio University. He joined Hitachi Ltd. in April of the same year. He is engaged in research and development of automatic production facilities particularly in research and development of servo control systems and signal processing systems. He is currently an Engineer at the company's Production Engineering Research Laboratory. He is a member of the Society of Instrument and Control Engineers and IEEE. Graduated in 1991 from the Department of Production Engineering of the Faculty of Engineering Yokohama National University and joined Hitachi Ltd. He is engaged in research and development of automatic production facilities particularly in research and development of signal processing systems. He is currently working at the company's Production Engineering Research Laboratory. Received his Master's degree in 1975 in Precision Engineering from Shizuoka University and then joined Hitachi Ltd. He is engaged in research on automatic adjustment and assembly technologies as well as development of their equipment. He is currently a Senior Engineer at the company's Production Engineering Research Laboratory. He is a member of the Japan Society of Mechanical Engineers and the Japan Society for Precision Engineering. Graduated in 1961 from the Department of Mechanical Engineering Tohoku University. He received his Ph.D. degree in Mechanical Engineering from Tokyo University in 1993. He joined Hitachi Ltd. in October 1970. He is engaged in research and development of automatic assembly technology and assembly equipment as well as inline process technology and process equipment. Since 1995 he has been with Ishinomaki Senshu University where he is currently a Professor. He is a member of the Japan Society of Mechanical Engineers and the Japan Society for Precision Engineering.

This paper presents a new discrimination procedure of signal waveforms based on wavelet theory for the inspection of rotating machinery. The wavelet transform decomposes signals into time-frequency space, rather than mere frequency space, limited by the uncertainty principle. This decomposition permits time-frequency analyses and provides a more flexible means of signal processing than before. To examine a rotary compressor pump, particular waves in the rotational load torque signals that correlate with failure modes are discriminated from one another and evaluated. To extract the focal waves, the signal is decomposed with wavelets and then only particular waves, such as impulses, are reconstructed from a selected set of wavelet coefficients. This is called time frequency space filtering. The wavelet local modulus maxima are used to pen a time-frequency window through which only the focal waves can pass with high fidelity. The maxima have information of the inflection points of the wave at each resolution that represent its waveform. The experimental results show the effectiveness of the procedure.

关键词： wavelets signal processing time-frequency analysis multiresolution decomposition inspection rotating machinery

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RECURSIVE TIME-VARYING FILTER BANKS FOR SUBBAND IMAGE-CODING

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IEEE TRANSACTIONS ON IMAGE processing 1995年第7期4卷 885-895页

作者： SMITH, MJT CHUNG, WCL Digital Signal Processing Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

Filter banks, subband/wavelets, and multiresolution decompositions that employ recursive filters have been considered previously and are recognized for their efficiency in partitioning the frequency spectrum. This paper presents an analysis of a new infinite impulse response (IIR) filter bank in which these computationally efficient filters may be changed adaptively in response to the input, The new filter bank framework is presented and discussed in the context of subband image coding. In the absence of quantization errors, exact reconstruction can be achieved, By the proper choice of an adaptation scheme, it is shown that recursive linear time-varying (LTV) filter banks can yield improvement over conventional ones.

关键词： Channel bank filters Image coding Filter bank Finite impulse response filter IIR filters Quantization Image reconstruction Frequency Predistortion Bit rate

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