2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)最新文献
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879973
P. Skocir, B. Marusic, J. Tasic
Lossy video coding using wavelet transforms at low bit-rates results in coding artifacts mainly observed as ringing effects. The performance of a coding system can be additionally enhanced if a spatio-temporal post-processing algorithm is applied at the end of the coding chain. The description of an adaptive spatio-temporal algorithm is the objective of this paper. The algorithm takes into account the motion information to avoid temporal blurring of moving edges and spatial edge information to avoid spatial blurring while implementing temporal and spatial filtering in order to alleviate the presence of the artifacts. Motion information is used in order to tune the algorithm adaptively so that motion compensated temporal filtering is applied only in non-motion areas and motion areas with low prediction error. The proposed algorithm uses adaptive spatial filtering that is based on edge detection and ringing area estimation for pixel classification in edge and non-edge corrupted pixels. Spatial filtering leaves edges unaffected to preserve image details. Experimented results show significant increase in perceptual quality of wide sequences.
{"title":"Spatio-temporal post-filtering of 3-D coded video sequences","authors":"P. Skocir, B. Marusic, J. Tasic","doi":"10.1109/MELCON.2000.879973","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879973","url":null,"abstract":"Lossy video coding using wavelet transforms at low bit-rates results in coding artifacts mainly observed as ringing effects. The performance of a coding system can be additionally enhanced if a spatio-temporal post-processing algorithm is applied at the end of the coding chain. The description of an adaptive spatio-temporal algorithm is the objective of this paper. The algorithm takes into account the motion information to avoid temporal blurring of moving edges and spatial edge information to avoid spatial blurring while implementing temporal and spatial filtering in order to alleviate the presence of the artifacts. Motion information is used in order to tune the algorithm adaptively so that motion compensated temporal filtering is applied only in non-motion areas and motion areas with low prediction error. The proposed algorithm uses adaptive spatial filtering that is based on edge detection and ringing area estimation for pixel classification in edge and non-edge corrupted pixels. Spatial filtering leaves edges unaffected to preserve image details. Experimented results show significant increase in perceptual quality of wide sequences.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"104 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113996537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880004
F.S. Al-Naimy, M. Nigam, A. Kasim
The design of finite impulse response (FIR) filters in one or two-dimensions can be performed with good computational efficiency using weighted least square (WLS) design. This paper presents an improved WLS technique for the design of 2-D FIR filters. We introduce an updating desired frequency response, which implicitly includes the weighting function such that the sum of weighted square errors to be minimized can be represented in a 2-D matrix form. This makes it possible to keep all filter parameters in their natural 2-D form, thereby reducing the computational complexity from O(N/sup 6/) to O(N/sup 3/). It is confirmed through design examples that our approach is computationally efficient and leads to nearly optimal approximations.
{"title":"Weighted least squares design of 2-D digital filters","authors":"F.S. Al-Naimy, M. Nigam, A. Kasim","doi":"10.1109/MELCON.2000.880004","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880004","url":null,"abstract":"The design of finite impulse response (FIR) filters in one or two-dimensions can be performed with good computational efficiency using weighted least square (WLS) design. This paper presents an improved WLS technique for the design of 2-D FIR filters. We introduce an updating desired frequency response, which implicitly includes the weighting function such that the sum of weighted square errors to be minimized can be represented in a 2-D matrix form. This makes it possible to keep all filter parameters in their natural 2-D form, thereby reducing the computational complexity from O(N/sup 6/) to O(N/sup 3/). It is confirmed through design examples that our approach is computationally efficient and leads to nearly optimal approximations.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122602788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880067
A. Demosthenous, J. Taylor
Convolutional decoders have long been important in applications where very noisy channels are encountered. The technique has become more significant with the advent of new application areas such as mobile radio systems of various types and digital magnetic recording systems. The most commonly employed decoding technique is the Viterbi algorithm (VA). This provides an optimum method for realising a convolutional decoder, but requires a large amount of digital memory, typically up to 50% of the total chip area. In this paper we describe an alternative method which we call the modified feedback decoding algorithm (MFDA). This requires no digital path memory and so can be realised entirely using analogue components. Although strictly sub-optimal, the loss of coding gain compared to the VA is only about 0.4 dB for a K=5 code.
{"title":"An architecture for miniaturised low power convolutional decoders","authors":"A. Demosthenous, J. Taylor","doi":"10.1109/MELCON.2000.880067","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880067","url":null,"abstract":"Convolutional decoders have long been important in applications where very noisy channels are encountered. The technique has become more significant with the advent of new application areas such as mobile radio systems of various types and digital magnetic recording systems. The most commonly employed decoding technique is the Viterbi algorithm (VA). This provides an optimum method for realising a convolutional decoder, but requires a large amount of digital memory, typically up to 50% of the total chip area. In this paper we describe an alternative method which we call the modified feedback decoding algorithm (MFDA). This requires no digital path memory and so can be realised entirely using analogue components. Although strictly sub-optimal, the loss of coding gain compared to the VA is only about 0.4 dB for a K=5 code.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"13 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131215975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880392
E. Zervanos, V. Dimitropoulos, A. Manolitzas, G. Stassinopoulos
This paper concerns the design and development of an application specific integrated circuit, targeting advanced ATM over ADSL applications. The work focuses on the functional verification of this processor and presents the hardware and the basic software architecture of the entire integrated circuit.
本文针对先进的ATM over ADSL应用，设计和开发了一种专用集成电路。重点对该处理器进行了功能验证，并给出了整个集成电路的硬件结构和基本软件结构。
{"title":"Simulation approach for functional verification of an \"ATM over ADSL\" integrated circuit","authors":"E. Zervanos, V. Dimitropoulos, A. Manolitzas, G. Stassinopoulos","doi":"10.1109/MELCON.2000.880392","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880392","url":null,"abstract":"This paper concerns the design and development of an application specific integrated circuit, targeting advanced ATM over ADSL applications. The work focuses on the functional verification of this processor and presents the hardware and the basic software architecture of the entire integrated circuit.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133609940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879684
J. Shikoski, R. Achkoski, U. Rechkoska
In this paper the application of the active EMI filters in order to solve practical utility problems and to improve the electric power quality are presented. Electrical distribution system components are designed to operate at the standard 50 or 60 Hz frequency. However, many loads found in industrial and residential settings demand currents that have frequency components with multiples of the 60 Hz fundamental. The most common effect of harmonic load currents is heating. The increased temperature reduces rating of equipment and operating performance. In extreme cases failure of equipment may occur. The results demonstrate that although the larger components, differential-mode capacitors and common-mode inductors, may be needed for attenuation at the fundamental frequency, their effectiveness becomes very limited at higher frequencies due to parasitics.
{"title":"Active filters for the improvement of electric power quality","authors":"J. Shikoski, R. Achkoski, U. Rechkoska","doi":"10.1109/MELCON.2000.879684","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879684","url":null,"abstract":"In this paper the application of the active EMI filters in order to solve practical utility problems and to improve the electric power quality are presented. Electrical distribution system components are designed to operate at the standard 50 or 60 Hz frequency. However, many loads found in industrial and residential settings demand currents that have frequency components with multiples of the 60 Hz fundamental. The most common effect of harmonic load currents is heating. The increased temperature reduces rating of equipment and operating performance. In extreme cases failure of equipment may occur. The results demonstrate that although the larger components, differential-mode capacitors and common-mode inductors, may be needed for attenuation at the fundamental frequency, their effectiveness becomes very limited at higher frequencies due to parasitics.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115728023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880013
N. Pavesic, S. Ribaric
Investigating the Kapur et al. (1985) image thresholding method, we found, that taking the sum of the Havrda and Charvat entropies as a criterion for threshold selection instead of the Shannon entropies, can result in a better image segmentation in the sense of greater uniformity of the partitioned segments, as well as greater contrast among segments.
{"title":"Gray level thresholding using the Havrda and Charvat entropy","authors":"N. Pavesic, S. Ribaric","doi":"10.1109/MELCON.2000.880013","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880013","url":null,"abstract":"Investigating the Kapur et al. (1985) image thresholding method, we found, that taking the sum of the Havrda and Charvat entropies as a criterion for threshold selection instead of the Shannon entropies, can result in a better image segmentation in the sense of greater uniformity of the partitioned segments, as well as greater contrast among segments.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114175311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879703
M. Joorabian
This paper describes the design and implementation of an accurate fault location technique using artificial neural networks (ANN) for the 400 kV Iranian transmission systems. The technique utilises voltage and current fault data at one line end only. These values are stored as waveform samples by a digital fault recorder (DFR) in the substations. The instantaneous three phase voltages and currents derived at the fault locator point on the line which contain fault information at different frequencies are used to train and test the artificial neural network (ANN). The paper presents the result of simulation studies to determine the performance and practical implementation of the technique.
{"title":"Artificial neural network based fault locator for EHV transmission system","authors":"M. Joorabian","doi":"10.1109/MELCON.2000.879703","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879703","url":null,"abstract":"This paper describes the design and implementation of an accurate fault location technique using artificial neural networks (ANN) for the 400 kV Iranian transmission systems. The technique utilises voltage and current fault data at one line end only. These values are stored as waveform samples by a digital fault recorder (DFR) in the substations. The instantaneous three phase voltages and currents derived at the fault locator point on the line which contain fault information at different frequencies are used to train and test the artificial neural network (ANN). The paper presents the result of simulation studies to determine the performance and practical implementation of the technique.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124900812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880445
S. I. Al-Mously, M. Al-Daghistani, Z. Alhamdani, M. Abousetta, K. Omran
Operating with multi-frequency and simultaneously mitigating the EMW hazard in the handset mobile telephone is the aim of this paper. To achieve this goal three arrays are constructed, each array, which contains three elements, corresponding to a different operating frequency. The operating frequencies chosen were 966.8 MHz, 1861 MHz and 1980 MHz. This choice enables the mobile to be compatible with different worldwide operating systems namely GSM-900, DCS-1800, PCS-1900 and DECT. The dimensions of each array and hence the power radiation pattern shall contribute greatly towards mitigating the hazard caused by the EM field radiated usually from the mobile set antenna.
{"title":"Three-element array antenna with triple-frequency operation in mobile telephone","authors":"S. I. Al-Mously, M. Al-Daghistani, Z. Alhamdani, M. Abousetta, K. Omran","doi":"10.1109/MELCON.2000.880445","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880445","url":null,"abstract":"Operating with multi-frequency and simultaneously mitigating the EMW hazard in the handset mobile telephone is the aim of this paper. To achieve this goal three arrays are constructed, each array, which contains three elements, corresponding to a different operating frequency. The operating frequencies chosen were 966.8 MHz, 1861 MHz and 1980 MHz. This choice enables the mobile to be compatible with different worldwide operating systems namely GSM-900, DCS-1800, PCS-1900 and DECT. The dimensions of each array and hence the power radiation pattern shall contribute greatly towards mitigating the hazard caused by the EM field radiated usually from the mobile set antenna.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123339476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880364
Adrian Gogu, Marina Topa
This paper presents the coefficients' computation method for implementing a digital reverberator based on the algorithm proposed by Jean-Marc Jot (1997). Applying the source image method the impulse response of a certain room can be derived, which approximates, especially for low frequency, the early reflections part of the natural impulse response. Considering the taps resulted from the mentioned method, a solution for Jot's reverberator design is offered, generating the early reflections and the desired shape for the late reverberation part. The method uses some approximations, which do not affect significantly the perception of the reverberated sound.
{"title":"Coefficients' computation for Jot's reverberation algorithm","authors":"Adrian Gogu, Marina Topa","doi":"10.1109/MELCON.2000.880364","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880364","url":null,"abstract":"This paper presents the coefficients' computation method for implementing a digital reverberator based on the algorithm proposed by Jean-Marc Jot (1997). Applying the source image method the impulse response of a certain room can be derived, which approximates, especially for low frequency, the early reflections part of the natural impulse response. Considering the taps resulted from the mentioned method, a solution for Jot's reverberator design is offered, generating the early reflections and the desired shape for the late reverberation part. The method uses some approximations, which do not affect significantly the perception of the reverberated sound.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122892594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879735
R. Caldon, A. Marí, A. Scala, R. Turri
The aim of this work is to investigate and evaluate the performance of UPFC (unified power flow controller) devices operating in a transmission system in order to control inter-area power oscillations originated by small disturbances. Particular emphasis is given in using the participation factor matrix in order to identify the state variables which mostly affect the modes of inter-area oscillations and to intervene on those state variables directly related to the FACTS action. The efficiency of the method is subsequently assessed by means of detailed dynamic simulations.
{"title":"Application of modal analysis for the enhancement of the performances of a UPFC controller in power oscillation damping","authors":"R. Caldon, A. Marí, A. Scala, R. Turri","doi":"10.1109/MELCON.2000.879735","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879735","url":null,"abstract":"The aim of this work is to investigate and evaluate the performance of UPFC (unified power flow controller) devices operating in a transmission system in order to control inter-area power oscillations originated by small disturbances. Particular emphasis is given in using the participation factor matrix in order to identify the state variables which mostly affect the modes of inter-area oscillations and to intervene on those state variables directly related to the FACTS action. The efficiency of the method is subsequently assessed by means of detailed dynamic simulations.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125433891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)
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