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Proceedings of SOUTHEASTCON '96最新文献

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The tradeoffs and realities of a low power high-volume design: a case study of the IBM ThinkPad 701 低功耗大容量设计的权衡与现实:IBM ThinkPad 701的案例研究
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510028
R. J. Evans, M. J. Stember, R. Ray
{"title":"The tradeoffs and realities of a low power high-volume design: a case study of the IBM ThinkPad 701","authors":"R. J. Evans, M. J. Stember, R. Ray","doi":"10.1109/SECON.1996.510028","DOIUrl":"https://doi.org/10.1109/SECON.1996.510028","url":null,"abstract":"This paper presents a discussion of the realities and tradeoffs involved in designing a low-power system in today's high-volume mobile computer market. The IBM ThinkPad 701 subnotebook computer is presented as an example of such a system which has experienced many design decisions based on these tradeoffs.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133986840","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}
引用次数: 0
Enhanced quality modified multiband excitation model at 2400 bps 改进的2400 bps的多波段激励模型
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510061
M. Jamrozik, J. Gowdy
{"title":"Enhanced quality modified multiband excitation model at 2400 bps","authors":"M. Jamrozik, J. Gowdy","doi":"10.1109/SECON.1996.510061","DOIUrl":"https://doi.org/10.1109/SECON.1996.510061","url":null,"abstract":"This paper introduces the modified multiband excitation model (MMBE) for speech coding. The MMBE is a modified version of the multiband excitation model which operates at lower bit rates and has improved speech quality. The MMBE is similar to the improved multiband excitation coder described in Hardwick and Lim (1991). The MMBE bit rate is reduced by employing more efficient coding techniques and reducing the number of voiced/unvoiced decisions per frame of speech than the original MBE. The complexity of the MMBE has been kept to a minimum in order to be suitable for real time applications with DSP chips. Preliminary results show the MMBE to meet or exceed the duality of previous MBE models at bit rates of 4.8 kbps and below.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130302335","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}
引用次数: 0
Variable rate vector quantization of the speech spectral envelope 语音频谱包络的可变速率矢量量化
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510058
S. McClellan, J. Gibson
{"title":"Variable rate vector quantization of the speech spectral envelope","authors":"S. McClellan, J. Gibson","doi":"10.1109/SECON.1996.510058","DOIUrl":"https://doi.org/10.1109/SECON.1996.510058","url":null,"abstract":"Effective rate variation during active speech is a necessary component of sophisticated variable rate speech compression schemes. Here, we use open-loop estimates of spectral shape to roughly determine signal bandwidth and bit allocations for variable rate encoding of spectral parameters. We analyze the application of the relative entropy functional to sets of line-spectrum pairs (LSPs) and transform-based generalized spectral distributions of Gibson et al. (1993). We present experimental results demonstrating that the relative entropy of these quantities can be used to good advantage in developing variable rate vector quantization schemes for the spectral envelope of speech signals.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115034272","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}
引用次数: 1
Ka-band site diversity research in a subtropical region utilizing the ACTS satellite 利用ACTS卫星研究亚热带地区ka波段站点多样性
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510072
R. Henning, S. Park, G. Szklarz
{"title":"Ka-band site diversity research in a subtropical region utilizing the ACTS satellite","authors":"R. Henning, S. Park, G. Szklarz","doi":"10.1109/SECON.1996.510072","DOIUrl":"https://doi.org/10.1109/SECON.1996.510072","url":null,"abstract":"In September 1993, NASA launched the Advanced Communication Technology Satellite (ACTS) to assist the United States in being it leader in global telecommunications. The University of South Florida (USF) was brought into this project with the task of illustrating the effect of weather events on signal propagation. With the cooperation of E-Systems, another experiment has begun, involving signal improvement employing multiple sites. Both USF and E-Systems receive a 20 GHz beacon signal. During rain storms, when degradation of the signal occurs at one location, the other site normally has a clear path for signal reception. As this weather pattern of intense localized rain cells is common for certain regions, such as in tropical and equatorial locations, there is industrial interest in the benefits of using site diversity techniques. Due to the lifetime of satellites, long duration studies generally are not available. To enable refinement of existing regional site diversity models, current data must be collected, which is the motivation behind this research.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114334967","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}
引用次数: 1
An analytical model for the insulated-gate bipolar transistor under all free-carrier injection conditions 所有自由载流子注入条件下的绝缘栅双极晶体管的解析模型
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510106
Y. Yue, J. Liou, I. Batarseh
{"title":"An analytical model for the insulated-gate bipolar transistor under all free-carrier injection conditions","authors":"Y. Yue, J. Liou, I. Batarseh","doi":"10.1109/SECON.1996.510106","DOIUrl":"https://doi.org/10.1109/SECON.1996.510106","url":null,"abstract":"The insulated-gate bipolar transistor (IGBT) is the most advanced and promising power switching device. This paper presents an analytical model for the current-voltage characteristics of such a device. The model is derived rigorously from the ambipolar transport equation and is valid for all free-carrier injection conditions, rather than just for a special case (i.e., low or high free-carrier injection) considered in the IGBT models reported to date in the literature. Results simulated from a two-dimensional device simulator called MEDICI are also included in support of the model.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"240 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114341350","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}
引用次数: 0
Chattering alleviation in variable structure control systems 变结构控制系统的颤振缓解
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510049
S. Garrett, S. Yadav
{"title":"Chattering alleviation in variable structure control systems","authors":"S. Garrett, S. Yadav","doi":"10.1109/SECON.1996.510049","DOIUrl":"https://doi.org/10.1109/SECON.1996.510049","url":null,"abstract":"High frequency chattering about the sliding line in variable structure control systems is undesirable in practice. In this paper, a method is proposed to eliminate this chattering. The system is allowed to switch once on crossing the switching line, after which the trajectory follows a path that closes in on the slower eigenvector. The loss of speed is compensated for by tailoring the eigenvector (achieved by feedback design) such that the eigenvalues are sufficiently negative. Theoretical analysis is confirmed by simulations.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115156517","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}
引用次数: 0
Remote valve controller provides precise positioning of process control valves 远程阀门控制器提供过程控制阀的精确定位
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510056
T. Ozkul, W. Raad
{"title":"Remote valve controller provides precise positioning of process control valves","authors":"T. Ozkul, W. Raad","doi":"10.1109/SECON.1996.510056","DOIUrl":"https://doi.org/10.1109/SECON.1996.510056","url":null,"abstract":"This paper describes the design of an intelligent metering valve which can be used for controlling chemical processes. The valve can be controlled remotely via a pair of communication wires from a host computer. A useful feature of the design is the ability to connect a large number of valves to the same pair of communications lines which can provide control and a status report of each valve.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122627991","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}
引用次数: 0
Simulation of multipath arrival times for wireless indoor networks 室内无线网络的多径到达时间模拟
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510119
Xiang Li, P. Flikkema
{"title":"Simulation of multipath arrival times for wireless indoor networks","authors":"Xiang Li, P. Flikkema","doi":"10.1109/SECON.1996.510119","DOIUrl":"https://doi.org/10.1109/SECON.1996.510119","url":null,"abstract":"The propagation channel of wireless indoor networks can be modeled as a linear filter with a complex-valued impulse response. Due to the effect of indoor multipath fading, this linear filter is characterized by three sets of random variables-path arrival times, path amplitudes and carrier phase shifts. This paper discusses a simulation model for the distribution of path arrival times based on the modified Poisson or /spl Delta/-K model. We present a discrete-time non-homogeneous Markov description of the arrival process, and present results indicating potential improvements in estimation of the model parameters. We then describe an implementation of the model using the Ptolemy simulation environment which can be used for evaluation of wideband wireless indoor communication links.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222174","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}
引用次数: 1
A rotating magnetic field approach to a low distortion poly-phase power rectifier 一种低畸变多相电源整流器的旋转磁场方法
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510134
K. Buckle, J. Luce
{"title":"A rotating magnetic field approach to a low distortion poly-phase power rectifier","authors":"K. Buckle, J. Luce","doi":"10.1109/SECON.1996.510134","DOIUrl":"https://doi.org/10.1109/SECON.1996.510134","url":null,"abstract":"The rotating magnetic field generated by a balanced three phase AC system of currents is employed to excite a polyphase secondary which is subsequently rectified. The use of the rotating magnetic field structure has distinct advantages for isolating the input AC system from the rectified DC system and, therefore, substantially reducing the current distortion present to a much lower level than in conventional rectifier circuits. This effect is achievable because the three phase currents generating the rotating magnetic field present a continuous balanced load to the input three phase AC system. Several models of this concept have been constructed. This paper presents the results obtained from the models and from a 5 kW operational system used to rectify three phase power for a high rate battery charger. The DC output ripple characteristics and reduced input harmonic line current distortion are discussed in comparison with standard transformer circuits with the same number of switching pulses.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130014274","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}
引用次数: 1
Analysis of VSC system designed via the reaching law approach 用趋近律法设计的VSC系统分析
Proceedings of SOUTHEASTCON '96 Pub Date : 1996-04-11 DOI: 10.1109/SECON.1996.510050
S. E. Ghazi
{"title":"Analysis of VSC system designed via the reaching law approach","authors":"S. E. Ghazi","doi":"10.1109/SECON.1996.510050","DOIUrl":"https://doi.org/10.1109/SECON.1996.510050","url":null,"abstract":"Variable structure control (VSC) has been recognized as a powerful control technique capable of providing robustness control with respect to system parameter variations and external disturbances. However, there is a lack of a design method for a practical VSC system, beginning with the given system performance specification and ending at the specification of instrumentation requirements. This paper involves the exploration and development of a practical design procedure for VSC systems. Simulation results are given to study the effect of the VSC parameters on the system performance.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129326861","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}
引用次数: 7
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