Pub Date : 1995-08-13DOI: 10.1109/MWSCAS.1995.510288
H. Xu, W. Lu, A. Antoniou
An iterative algorithm for the design of multi-channel cosine-modulated quadrature mirror filter (QMF) banks with near-perfect reconstruction is proposed. The objective function is formulated as a quadratic function in each step whose minimum point can be obtained using a closed-form solution. This approach is very efficient and leads to filter banks with high stop-band attenuation and low aliasing and amplitude distortions. Two design examples are included to demonstrate the proposed algorithm and some comparisons are made with existing designs.
{"title":"An efficient algorithm for the design of multi-channel cosine-modulated QMF banks","authors":"H. Xu, W. Lu, A. Antoniou","doi":"10.1109/MWSCAS.1995.510288","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510288","url":null,"abstract":"An iterative algorithm for the design of multi-channel cosine-modulated quadrature mirror filter (QMF) banks with near-perfect reconstruction is proposed. The objective function is formulated as a quadratic function in each step whose minimum point can be obtained using a closed-form solution. This approach is very efficient and leads to filter banks with high stop-band attenuation and low aliasing and amplitude distortions. Two design examples are included to demonstrate the proposed algorithm and some comparisons are made with existing designs.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131633261","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.504472
A. P. de Moura, M.A. de Carvalho, W. S. Mota
This paper present a new decoupled load flow. The method is derived for a version of fast decoupled load flow method. The proposed load flow joins the excellent characteristics of decoupled methods with the distribution system's property equivalent power sum. Numerical results were confronted with results of the fast decoupled method and three versions to demonstrate the efficiency of the proposed method.
{"title":"Modified decoupled load flow with equivalent power accumulation for distribution systems","authors":"A. P. de Moura, M.A. de Carvalho, W. S. Mota","doi":"10.1109/MWSCAS.1995.504472","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504472","url":null,"abstract":"This paper present a new decoupled load flow. The method is derived for a version of fast decoupled load flow method. The proposed load flow joins the excellent characteristics of decoupled methods with the distribution system's property equivalent power sum. Numerical results were confronted with results of the fast decoupled method and three versions to demonstrate the efficiency of the proposed method.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131730791","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.504489
C.V.N. de Albuquerque, M. D. Nunes, O. Duarte
This paper proposes and analyses an efficient implementation architecture well suited to layered communication systems. High throughput is achieved by the design of specific layer interfaces and data structures, specialized mechanisms of memory management, timer management and task scheduling. Performance measurements were accomplished considering a complete OSI protocol stack. The obtained results show a throughput efficiency that attains 6 Mbit/s for a MAC layer user and 2.5 Mbit/s for a presentation layer user in a remote communication. 43 Mbit/s throughput for the MAC layer user is achieved in a loopback configuration. The most important bottlenecks are analysed and consist of the transport checksum, acknowledgment step frequency, data copy, memory management and task scheduling.
{"title":"An efficient implementation architecture for layered communication systems","authors":"C.V.N. de Albuquerque, M. D. Nunes, O. Duarte","doi":"10.1109/MWSCAS.1995.504489","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504489","url":null,"abstract":"This paper proposes and analyses an efficient implementation architecture well suited to layered communication systems. High throughput is achieved by the design of specific layer interfaces and data structures, specialized mechanisms of memory management, timer management and task scheduling. Performance measurements were accomplished considering a complete OSI protocol stack. The obtained results show a throughput efficiency that attains 6 Mbit/s for a MAC layer user and 2.5 Mbit/s for a presentation layer user in a remote communication. 43 Mbit/s throughput for the MAC layer user is achieved in a loopback configuration. The most important bottlenecks are analysed and consist of the transport checksum, acknowledgment step frequency, data copy, memory management and task scheduling.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131125777","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.510268
R. Coppoolse, J. Verbeke, P. Lambrecht, J. Codenie, J. Vandewege
In this paper, first a new configuration for a preamplifier circuit used in broadband optical communication networks is presented. Secondly this differential transimpedance amplifier has been implemented in both a bipolar and a CMOS process. Simple formulas for the main characteristics are derived for both implementations. Measurements show the good performance of the configuration used, and highlight the differences between both implementations.
{"title":"Comparison of a bipolar and a CMOS front end in broadband optical transimpedance amplifiers","authors":"R. Coppoolse, J. Verbeke, P. Lambrecht, J. Codenie, J. Vandewege","doi":"10.1109/MWSCAS.1995.510268","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510268","url":null,"abstract":"In this paper, first a new configuration for a preamplifier circuit used in broadband optical communication networks is presented. Secondly this differential transimpedance amplifier has been implemented in both a bipolar and a CMOS process. Simple formulas for the main characteristics are derived for both implementations. Measurements show the good performance of the configuration used, and highlight the differences between both implementations.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131424468","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.504514
Yu Zhiping, Zhao Jing
In the companion paper (see ibid., p. 612-15, Aug. 1995), we have presented novel time waveforms revealed in the non-piecewise-linear autonomous system (NPLAS) and have advanced a numerical symbol representation to analyze the complex waveforms. In this paper, we introduce definitions of the unit waveforms and the allotropic waveforms and characterize the bifurcation structure, of the system with further study of the complex periodic waveforms. In addition, we demonstrate the bifurcation regularity through the union of the sets and the Farey sum.
{"title":"The non-piecewise-linear autonomous system. II. The complex bifurcation structure","authors":"Yu Zhiping, Zhao Jing","doi":"10.1109/MWSCAS.1995.504514","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504514","url":null,"abstract":"In the companion paper (see ibid., p. 612-15, Aug. 1995), we have presented novel time waveforms revealed in the non-piecewise-linear autonomous system (NPLAS) and have advanced a numerical symbol representation to analyze the complex waveforms. In this paper, we introduce definitions of the unit waveforms and the allotropic waveforms and characterize the bifurcation structure, of the system with further study of the complex periodic waveforms. In addition, we demonstrate the bifurcation regularity through the union of the sets and the Farey sum.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124129045","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.510340
M. C. Schneider, T. Baechler, C. Galup-Montoro, S. Noceti Filho, S. M. Acosta
This paper shows that the use of the series-parallel association of transistors can substitute with advantages transistors with arbitrary W and L. Also, the use of composite transistors allows the design of current dividers which can be used for D/A conversion. As a consequence, it becomes clear that the design of high performance analog circuits in a conventional SOG is possible.
{"title":"Design techniques for analog circuits in sea of transistors","authors":"M. C. Schneider, T. Baechler, C. Galup-Montoro, S. Noceti Filho, S. M. Acosta","doi":"10.1109/MWSCAS.1995.510340","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510340","url":null,"abstract":"This paper shows that the use of the series-parallel association of transistors can substitute with advantages transistors with arbitrary W and L. Also, the use of composite transistors allows the design of current dividers which can be used for D/A conversion. As a consequence, it becomes clear that the design of high performance analog circuits in a conventional SOG is possible.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124588815","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.504503
T. Saramaki, M. Renfors
An efficient Remez-type algorithm is introduced for determining an allpass section in such a way that its phase response minimizes in the Chebyshev sense a given weighted error function on a closed subset of [0, /spl pi/]. The effectiveness of the algorithm is based on two facts. First, for the best solution of an allpass filter of order N, if it exists, the weighted error function achieves the peak absolute value with alternating signs at least at N+1 consecutive points in the approximation subset. Second, the phase response of an allpass filter of order N can be forced to take on the given values at N points by using the recurrence formulas of Henk. The algorithm can be applied in a straightforward manner for designing phase equalizers, filters proving an arbitrary noninteger delay, and special approximately linear-phase Hilbert transformers as well as filters with transfer function of the form H(z)=[z/sup -M/+A(z)]/2 with A(z) being an allpass filter. Furthermore, it can be applied for designing wave lattice filters (parallel connection of two stable allpass filters) having several passband and stopband regions and arbitrary weightings in these regions. Several examples are included illustrating the flexibility and efficiency of the proposed design technique.
介绍了一种有效的remez型算法，用于确定全通段，使其相位响应在切比雪夫意义上最小化给定的加权误差函数在封闭子集[0，/spl pi/]上。该算法的有效性基于两个事实。首先，对于N阶全通滤波器的最优解，如果存在，则加权误差函数至少在近似子集的N+1个连续点处达到交替符号的峰值绝对值。其次，利用Henk的递推公式，可以迫使N阶全通滤波器的相位响应在N点处取给定值。该算法可以直接应用于相位均衡器、证明任意非整数延迟的滤波器、特殊的近似线性相位希尔伯特变压器以及传递函数为H(z)=[z/sup -M/+ a (z)]/2且a (z)为全通滤波器的滤波器的设计。此外，它还可以用于设计具有多个通带和阻带区域的波格滤波器(两个稳定全通滤波器的并联)，并在这些区域中进行任意加权。几个例子说明了所提出的设计技术的灵活性和效率。
{"title":"A Remez-type algorithm for designing digital filters composed of all-pass sections based on phase approximations","authors":"T. Saramaki, M. Renfors","doi":"10.1109/MWSCAS.1995.504503","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504503","url":null,"abstract":"An efficient Remez-type algorithm is introduced for determining an allpass section in such a way that its phase response minimizes in the Chebyshev sense a given weighted error function on a closed subset of [0, /spl pi/]. The effectiveness of the algorithm is based on two facts. First, for the best solution of an allpass filter of order N, if it exists, the weighted error function achieves the peak absolute value with alternating signs at least at N+1 consecutive points in the approximation subset. Second, the phase response of an allpass filter of order N can be forced to take on the given values at N points by using the recurrence formulas of Henk. The algorithm can be applied in a straightforward manner for designing phase equalizers, filters proving an arbitrary noninteger delay, and special approximately linear-phase Hilbert transformers as well as filters with transfer function of the form H(z)=[z/sup -M/+A(z)]/2 with A(z) being an allpass filter. Furthermore, it can be applied for designing wave lattice filters (parallel connection of two stable allpass filters) having several passband and stopband regions and arbitrary weightings in these regions. Several examples are included illustrating the flexibility and efficiency of the proposed design technique.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114478642","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.504396
B. E. Schmitz, R. Stevenson
In image communication systems, sub-sampling can be used to decrease the transmission rate of images. Since the Human Visual System is less sensitive to chrominance information, one common technique is to sub-sample chrominance information, leaving a high-resolution luminance plane. This process however creates artifacts and results in a degraded image which often contains false colors. Much better visual results can be obtained by enhancing the image after transmission. This paper develops an algorithm for enhancing color image data that has sub-sampled chrominance planes. The algorithm is based on stochastic regularization using the high-resolution luminance channel to guide the enhancement of the sub-sampled channels. Visual results are presented.
{"title":"Enhancement of sub-sampled chrominance image data","authors":"B. E. Schmitz, R. Stevenson","doi":"10.1109/MWSCAS.1995.504396","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504396","url":null,"abstract":"In image communication systems, sub-sampling can be used to decrease the transmission rate of images. Since the Human Visual System is less sensitive to chrominance information, one common technique is to sub-sample chrominance information, leaving a high-resolution luminance plane. This process however creates artifacts and results in a degraded image which often contains false colors. Much better visual results can be obtained by enhancing the image after transmission. This paper develops an algorithm for enhancing color image data that has sub-sampled chrominance planes. The algorithm is based on stochastic regularization using the high-resolution luminance channel to guide the enhancement of the sub-sampled channels. Visual results are presented.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114719477","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.504442
P. van Halen, G. Boyle
The latest generation of circuit designers are much more familiar with CAD systems, with their graphical user interfaces, than with traditional test and measurement instruments. In this project we have built on this familiarity by using the well-known CAD environment to run both virtual and actual Test and Measurement devices. Using the Analog Design System/Model Development System, a simulation environment with a powerful model developing language, we developed instrument simulation models for T&M equipment. Every model is a high-level functional description of the salient features of an instrument. With these instrument models, the circuit designer can now evaluate the validity of a specific customized testing procedure through simulation. Since the customized test has all the information needed to perform the actual measurement, ADS can use this information to virtually control the actual instrument.
{"title":"Redefining the virtual instrument: merging simulation and test and measurement","authors":"P. van Halen, G. Boyle","doi":"10.1109/MWSCAS.1995.504442","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504442","url":null,"abstract":"The latest generation of circuit designers are much more familiar with CAD systems, with their graphical user interfaces, than with traditional test and measurement instruments. In this project we have built on this familiarity by using the well-known CAD environment to run both virtual and actual Test and Measurement devices. Using the Analog Design System/Model Development System, a simulation environment with a powerful model developing language, we developed instrument simulation models for T&M equipment. Every model is a high-level functional description of the salient features of an instrument. With these instrument models, the circuit designer can now evaluate the validity of a specific customized testing procedure through simulation. Since the customized test has all the information needed to perform the actual measurement, ADS can use this information to virtually control the actual instrument.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116917516","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 : 1995-08-13DOI: 10.1109/MWSCAS.1995.510338
G. M. Peixoto, J. C. de Oliveira, F. de Oliveira
Voltage flicker has emerged as a major concern problem in the area of power quality. Amongst its effects, it is recognised that, in addition to the visual inconvenience, several types of electrical equipment can be strongly disturbed. This paper describes the voltage flicker phenomena, presenting its conception, definition, origin and methods of evaluation. Three procedures are considered: British, French and Standard. In addition to these theoretical contributions, this paper describes an instrument specially developed to provide a diagnostic of electrical system behaviour as long as voltage fluctuation is concerned. Experimental results associated with site measurements are also given to illustrate the developed prototype's performance.
{"title":"A proposal for voltage flicker measurement in electrical power systems","authors":"G. M. Peixoto, J. C. de Oliveira, F. de Oliveira","doi":"10.1109/MWSCAS.1995.510338","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510338","url":null,"abstract":"Voltage flicker has emerged as a major concern problem in the area of power quality. Amongst its effects, it is recognised that, in addition to the visual inconvenience, several types of electrical equipment can be strongly disturbed. This paper describes the voltage flicker phenomena, presenting its conception, definition, origin and methods of evaluation. Three procedures are considered: British, French and Standard. In addition to these theoretical contributions, this paper describes an instrument specially developed to provide a diagnostic of electrical system behaviour as long as voltage fluctuation is concerned. Experimental results associated with site measurements are also given to illustrate the developed prototype's performance.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117016127","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：