Singapore ICCS '94. Conference Proceedings.

14-18 Nov 1994

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  • Communication processing techniques for multimedia systems

    Publication Year: 1994, Page(s):974 - 980 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Key techniques required for communication processing in multimedia systems are (1) high-speed protocol processing of every data packet and (2) simultaneously processing of many sessions. This paper proposes three solutions of high-performance protocol processing: protocol data unit management using page management method, assembling and disassembling of header and contents in hardware, and resched... View full abstract»

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  • MEmail: a distributed multimedia electronic mail system

    Publication Year: 1994, Page(s):981 - 985 vol.3
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    MEmail (Multimedia Electronic Mail System) is a distributed electronic mail system which is designed to allow clients to share and manipulate multimedia messages from a Mail server and Media server. The use of client-server paradigm enables the system to cater to different client platforms, thereby allowing different workstations and PCs to share messages. MEmail extends the model of existing inte... View full abstract»

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  • Cooperative multimedia structures management

    Publication Year: 1994, Page(s):986 - 990 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    This paper presents an architecture and an organization of a management system for cooperative multimedia structures. The architecture is based on the integrated management concept, integrating management functionalities for broadband communications, and also for cooperative structures which imply the management of multipoint multimedia communications View full abstract»

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  • New codes for bar code type recording systems

    Publication Year: 1994, Page(s):1054 - 1058 vol.3
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    A class of new two-dimensional codes, called triangle codes, is proposed for bar code type recording systems. We show that triangle codes bring higher density and emphasize the capability of detecting symbol-direction as compared with conventional codes View full abstract»

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  • Multi-sinusoid excitation model for audio coding

    Publication Year: 1994, Page(s):875 - 879 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Most studies in LPC-based audio coders decompose the signal into the product of excitation and system spectra, and then quantize the excitation by using either a stochastic codebook or multiple pulses. But their near white spectra cannot precisely describe the harmonic characteristics of excitation, especially when dealing with instrumental music. The paper explores the benefits of sinusoidal repr... View full abstract»

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  • A study into a microwave liquid level gauging system incorporating a surface waveguide as the transmission medium

    Publication Year: 1994, Page(s):939 - 943 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A theoretical and experimental study into a microwave level gauging system incorporating a Goubau guide as the transmission medium is performed. Merits of the effective wave launching and the sensitivity of the system are discussed. Experimental tests show that the investigated system is capable of efficiently detecting the level of high and low reflectivity liquids View full abstract»

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  • A new control scheme for multimedia personal LANs

    Publication Year: 1994, Page(s):991 - 995 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    This paper presents a new control scheme to realize concurrent transmission for multi-users in multimedia communication on token ring local area networks (LANs). When a token arrives-at a station continuously transmitting a frame to another station, the station will insert a control pattern called insertion pattern IP to the data field of the frame. A destination station will detect such a pattern... View full abstract»

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  • Comparison of correlation parameters of binary codes for DS/CDMA systems

    Publication Year: 1994, Page(s):1059 - 1063 vol.3
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    In this paper, a comprehensive study is carried out to analyze different spreading codes for a DS/CDMA system, and an objective way is presented to measure the performance of different codes based on various correlation parameters such as aperiodic, even, odd, maximal, mean and square-sum cross-correlations. The codes concerned in this paper include m-sequence, Gold, Kasami, GMW, No and Walsh code... View full abstract»

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  • Analysis of a credit manager for traffic regulation in a high speed network system with finite buffer

    Publication Year: 1994, Page(s):1004 - 1007 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    We investigate a high speed network system with finite buffer subject to flow control by a credit manager. The main purpose of the credit manager is to smooth out the burstiness of the input process, thereby making it easier for the network to handle large amount of data without undue delays, congestion or buffer overflow. We model the system as a quasi-birth-death (QBD) process for which the stea... View full abstract»

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  • Iterative frequency estimation from phase

    Publication Year: 1994, Page(s):920 - 924 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    This paper introduces iterative frequency estimation techniques from phase-only data. It is well known that the frequency estimate can be obtained from the discrete samples of the signal phase. The phase-only data of a complex input signal has been used to estimate the signal frequency by several authors; but those methods are restricted by the number of frequencies they can estimate. The proposed... View full abstract»

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  • Performance analysis of dynamic channel assignment in cellular mobile systems

    Publication Year: 1994, Page(s):1095 - 1098 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    Finding an efficient technique to analyze the performance of various channel assignment strategies is one of the major problems in cellular mobile systems. The authors first investigate the traffic analysis of dynamic channel assignment (DCA) with maximum packing (MP) and show its model can be transformed to that of an equivalent circuit-switched network. Then the exact and approximation methods d... View full abstract»

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  • A low delay speech coding system at 4.8 kb/s

    Publication Year: 1994, Page(s):880 - 883 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Low-delay speech coding has drawn much attention because of its many potential applications. A lot of low delay speech coders have been proposed in the past few years. But almost all of them focus on the speech bit rate between 8 kb/s to 16 kb/s. The authors present a low delay speech coder operating at 4.8 kb/s which provides good speech quality with a coding delay only about 2.5 msec. This new l... View full abstract»

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  • High precision electromagnetic field sensors for monitoring communications devices

    Publication Year: 1994, Page(s):944 - 948 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Presents computer simulation and experimental aspects towards the development of passive, all-dielectric, electro-optic and magneto-optic sensors based an the Pockel's and Faraday effects, respectively. Semiconductor crystals, laser diode and fibre optic technology will enable the measurement of electromagnetic fields from communications devices at frequencies up to 2 GHz View full abstract»

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  • Design and implementation of an OSI RPC system

    Publication Year: 1994, Page(s):1195 - 1199 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    It is expected that the OSI-RPC (remote procedure call) will be the primary technique for providing communications support between components of open distributed processing environments. The paper presents a design and implementation of an OSI RPC mechanism based on the model proposed by ISO in its second Committee Draft View full abstract»

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  • User/network traffic conversion in broadband network

    Publication Year: 1994, Page(s):996 - 1000 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    In this paper, we present a methodology aimed at providing a network controller with traffic characteristics pertinent to individual users applications. We start with a classification of source traffic in a broadband integrated network. Traffic is analyzed in terms of its constituent applications generated at a user's site. The classification criteria include different quality of service (QOS) mea... View full abstract»

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  • A gain/phase calibration technique for adaptive beamforming

    Publication Year: 1994, Page(s):912 - 914 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    A calibration technique is proposed to handle the minimum variance distortionless response (MVDR) adaptive beamforming problems involving unknown perturbed sensor/channel gain and phase. This technique is using basically the property of the MUSIC null spectrum. From the computer study, it is found that this technique exhibits relatively stable performance over other existing techniques in the sens... View full abstract»

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  • Providing a white page service to the Human Genome Project

    Publication Year: 1994, Page(s):1185 - 1189 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    As the Human Genome Project grows, so does the number of genome users, activities, organizations, and databases. There is a need to provide an electronic white page service to genome users, so that a genome user can for instance find out the e-mail address of a remote genome user or the network address of a genome database server. Because of the distributed and heterogeneous nature of the Human Ge... View full abstract»

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  • Hybrid 3D subband-predictive VQ coder for VLBR applications

    Publication Year: 1994, Page(s):1112 - 1116 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A dual-mode 3D based subband video coder operating at very low bit rates for PSTN and mobile networks, is proposed. When operating in baseline mode, the input video sequence is coded using a hybrid SIM3 algorithm. In 3D mode, the encoder performed subband temporal-spatial analysis using a short length QMF filter on the motion compensated frame difference frames and the resulting subbands are vecto... View full abstract»

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  • Thresholding for edge detection using fuzzy reasoning technique

    Publication Year: 1994, Page(s):1121 - 1124 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Threshold values for extracting effective sketch features are different according to images. Moreover, a global threshold cannot extract sketch features effectively because of the fact that there are various types of objects and regions having many different gray levels within a single image, and the human visual characteristics are more sensitive to the sketch features in dark regions than in bri... View full abstract»

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  • 3D subband VLBR video coding scheme

    Publication Year: 1994, Page(s):1130 - 1134 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A video coder for very low bit rate applications is designed and simulated. It employs a subband analysis technique to first split the video signal into four temporal subbands. Motion detection is performed to classify the co-sited macroblocks of the subbands into temporal activity (TA) macroblocks or no temporal activity (NTA) macroblocks. The base temporal subband is coded using a H.261-like (Eu... View full abstract»

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  • An improved DC- and Nyquist-free error control line code

    Publication Year: 1994, Page(s):1064 - 1068 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    An improved DC- and Nyquist-free error control line code based on the (8,4) extended Hamming code is proposed and its performance is analyzed. To increase its code rate, two blocks of error control codes are used as a line code with simple pre-coding. The proposed code can be well suited for high speed communication links, where DC- and Nyquist-free pulse format, channel error control, and low-com... View full abstract»

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  • Algorithms for efficient bandwidth utilization on survivable telecommunication networks

    Publication Year: 1994, Page(s):1154 - 1157 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    This paper suggests a line restoration (rerouting) algorithm based on the minimum cost path (rather than the k-shortest path) for protection possible link failures and also develops a spare capacity determination algorithm based on the k-shortest path for the restoration algorithm. The restoration algorithm can supplement telecommunication networks with dedicated facility restoration mechanisms, w... View full abstract»

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  • Optimal scheduling for multiclass queues with blocking

    Publication Year: 1994, Page(s):1008 - 1012 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A problem of optimal scheduling of multiple queues competing for service at a single station is considered, where each queue has a finite buffer and the service may be class dependent. The cost is linear in the number of waiting customers and also includes the cost of customers lost due to blocking upon arrival to a full queue. The scheduling problem is solved by converting to a discrete Markov de... View full abstract»

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  • A weighted spatial smoothing scheme for high-resolution direction-of-arrival estimation in unknown correlated noise

    Publication Year: 1994, Page(s):925 - 929 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    We first show that any weighted spatial smoothing of subarray covariance matrices with nonzero weights will lead to a decorrelation of the signals, and discuss the consequences of using negative weights. We then propose a weighted spatial smoothing which will eliminate a class of correlated noise frequently discussed in the literature. We next develop a procedure based on weighted spatial smoothin... View full abstract»

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  • A real-valued adaptive eigencomponents updated algorithm for beamforming

    Publication Year: 1994, Page(s):897 - 901 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    We consider a symmetrically distributed antenna array and develop an efficient real-valued adaptive algorithm to adjust the eigencomponents of the correlation matrix by an iterative technique. The iterative technique can alleviate the computation burden in the eigendecomposition. The proposed algorithm requires only O(M) real multiplications in each iteration and can converge faster than the LMS-t... View full abstract»

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