Pub Date : 1995-08-13DOI: 10.1109/MWSCAS.1995.504513
Yu Zhiping, Zhao Jing
In the non-piecewise-linear autonomous system (NPLAS) a power avalanche transistor, whose curve measured in the I-V plane is not simply characterized by piecewise straight-line segments, is used for the nonlinear element. From the NPLAS, much more complicated and detailed bifurcation phenomena than that in other nonautonomous and autonomous systems have been observed. This paper presents quite a number of novel and complex waveform. In order to distinguish and investigate the complex waveforms a new numerical symbol representation is advanced.
{"title":"The non-piecewise-linear autonomous system. I. More details on the periodic waveforms","authors":"Yu Zhiping, Zhao Jing","doi":"10.1109/MWSCAS.1995.504513","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504513","url":null,"abstract":"In the non-piecewise-linear autonomous system (NPLAS) a power avalanche transistor, whose curve measured in the I-V plane is not simply characterized by piecewise straight-line segments, is used for the nonlinear element. From the NPLAS, much more complicated and detailed bifurcation phenomena than that in other nonautonomous and autonomous systems have been observed. This paper presents quite a number of novel and complex waveform. In order to distinguish and investigate the complex waveforms a new numerical symbol representation is advanced.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"171 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":"116005374","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.1995.510211
B. Korst-Fagundes, Jun Xie, M. Snelgrove
Equalizing the acoustical frequency response of a room at several points, using several loudspeakers, involves taking the inverse of a matrix frequency response. An exact inverse is generally not practical because the room transfer-function matrix is often nearly singular at some frequencies, causing high-Q equalizer peaks and making the room response unacceptable at points other than those where measurements are taken. We show how to diagnose and deal with the problem. The results presented were acquired using measurements taken in a car.
{"title":"Multipoint equalization with the condition number","authors":"B. Korst-Fagundes, Jun Xie, M. Snelgrove","doi":"10.1109/MWSCAS.1995.510211","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510211","url":null,"abstract":"Equalizing the acoustical frequency response of a room at several points, using several loudspeakers, involves taking the inverse of a matrix frequency response. An exact inverse is generally not practical because the room transfer-function matrix is often nearly singular at some frequencies, causing high-Q equalizer peaks and making the room response unacceptable at points other than those where measurements are taken. We show how to diagnose and deal with the problem. The results presented were acquired using measurements taken in a car.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"17 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":"116844440","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.1995.504509
E. Abdel-Raheem, F. El-Guibaly, A. Antoniou
An iterative method proposed by Chen and Lee (1992) with certain modifications based on the weighted least-squares (WLS) updating scheme proposed by Sunder and Ramathandran (1994) is applied to the design of quadrature mirror-image filter (QMF) banks. The results are then compared with results obtained by other WLS methods described in the literature. The design of QMF banks satisfying prescribed specifications is also considered.
{"title":"Weighted minimax design of QMF banks: results and comparisons","authors":"E. Abdel-Raheem, F. El-Guibaly, A. Antoniou","doi":"10.1109/MWSCAS.1995.504509","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504509","url":null,"abstract":"An iterative method proposed by Chen and Lee (1992) with certain modifications based on the weighted least-squares (WLS) updating scheme proposed by Sunder and Ramathandran (1994) is applied to the design of quadrature mirror-image filter (QMF) banks. The results are then compared with results obtained by other WLS methods described in the literature. The design of QMF banks satisfying prescribed specifications is also considered.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"75 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":"126187280","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.1995.510177
E. D. da Silva, U. de Valois, T.O. Meneses
An existing idea for a ZCS quasi-resonant converter was extended to generate families of zero-current-switching PWM dc/dc converters. The converter output voltage is regulated by controlling turn on of the auxiliary switch while both main and auxiliary switches maintain the ZCS and/or ZVS condition during the constant frequency operation.
{"title":"Zero-current-switching PWM dc/dc converters","authors":"E. D. da Silva, U. de Valois, T.O. Meneses","doi":"10.1109/MWSCAS.1995.510177","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510177","url":null,"abstract":"An existing idea for a ZCS quasi-resonant converter was extended to generate families of zero-current-switching PWM dc/dc converters. The converter output voltage is regulated by controlling turn on of the auxiliary switch while both main and auxiliary switches maintain the ZCS and/or ZVS condition during the constant frequency operation.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"24 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":"124636274","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.1995.510304
J. Hatfield, A. Armitage
Progress towards a high resolution, high frequency, hand-held, ultrasonic scanner is reported. For acceptable image reconstruction, signal quantisation frequency must be of the order of eight times the ultrasonic centre frequency. For ultrasound with centre frequencies in excess of 20 MHz the design problems for hand held devices are formidable. To meet the demanding sampling rate criteria, an undersampling approach is presented. The associated hardware is described and preliminary results are also presented.
{"title":"High frequency ultrasonic scanning system","authors":"J. Hatfield, A. Armitage","doi":"10.1109/MWSCAS.1995.510304","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510304","url":null,"abstract":"Progress towards a high resolution, high frequency, hand-held, ultrasonic scanner is reported. For acceptable image reconstruction, signal quantisation frequency must be of the order of eight times the ultrasonic centre frequency. For ultrasound with centre frequencies in excess of 20 MHz the design problems for hand held devices are formidable. To meet the demanding sampling rate criteria, an undersampling approach is presented. The associated hardware is described and preliminary results are also presented.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"8 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":"124750553","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.1995.510274
J.B. Silva, C. Leme, J. Franca
This paper describes a second order delta-sigma modulator that employs differential current mode transistor-only circuits and calibration techniques to achieve 12-13 bit resolution with better than 70 dB linearity. A differential first generation based S/sup 2/I cell is adopted for its superior linearity and high transfer accuracy, while the use of an efficient self-calibrating technique minimizes integrator loss due to transistor mismatches and process variations. Simulation results indicate a -69 dB harmonic distortion for the current delay cell at a clock frequency of 1 MHz. The modulator occupies 2.73/spl times/2.13 mm/sup 2/ of silicon area in a 0.8 /spl mu/m DPSM CMOS process.
{"title":"A fully-differential self-calibrated switched-current /spl Delta//spl Sigma/ modulator","authors":"J.B. Silva, C. Leme, J. Franca","doi":"10.1109/MWSCAS.1995.510274","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510274","url":null,"abstract":"This paper describes a second order delta-sigma modulator that employs differential current mode transistor-only circuits and calibration techniques to achieve 12-13 bit resolution with better than 70 dB linearity. A differential first generation based S/sup 2/I cell is adopted for its superior linearity and high transfer accuracy, while the use of an efficient self-calibrating technique minimizes integrator loss due to transistor mismatches and process variations. Simulation results indicate a -69 dB harmonic distortion for the current delay cell at a clock frequency of 1 MHz. The modulator occupies 2.73/spl times/2.13 mm/sup 2/ of silicon area in a 0.8 /spl mu/m DPSM CMOS process.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"1 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":"128929799","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.1995.504481
A. Yost, P. Bauer
The results described in this paper provide conditions for the asymptotic stability of 2-D shift-variant uncertain systems expressed using the Roesser state-space description. A necessary and sufficient condition for the asymptotic stability of 1-D systems involves checking all products of extreme matrices. The same test is shown to apply to 2-D systems, although the corresponding stability condition is sufficient, but not necessary.
{"title":"Robust asymptotic stability of 2-D shift-variant discrete state-space systems","authors":"A. Yost, P. Bauer","doi":"10.1109/MWSCAS.1995.504481","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504481","url":null,"abstract":"The results described in this paper provide conditions for the asymptotic stability of 2-D shift-variant uncertain systems expressed using the Roesser state-space description. A necessary and sufficient condition for the asymptotic stability of 1-D systems involves checking all products of extreme matrices. The same test is shown to apply to 2-D systems, although the corresponding stability condition is sufficient, but not necessary.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"36 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":"125657927","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.1995.510291
R. D. de Queiroz, D. Florêncio
A new nonexpansive pyramidal decomposition is proposed. The signal is decomposed through a nonlinear filter bank into low- and high-pass signals and the recursion of the filter bank over the low-pass signal generates a pyramid resembling that of the octave wavelet transform. The transformed samples were grouped into square blocks and used to replace the DCT in the JPEG coder. The proposed coder shows several advantages: computation is greatly reduced compared to the DCT, image edges are better encoded, blocking is eliminated, and it allows lossless coding.
{"title":"A nonlinear filter bank for image coding","authors":"R. D. de Queiroz, D. Florêncio","doi":"10.1109/MWSCAS.1995.510291","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.510291","url":null,"abstract":"A new nonexpansive pyramidal decomposition is proposed. The signal is decomposed through a nonlinear filter bank into low- and high-pass signals and the recursion of the filter bank over the low-pass signal generates a pyramid resembling that of the octave wavelet transform. The transformed samples were grouped into square blocks and used to replace the DCT in the JPEG coder. The proposed coder shows several advantages: computation is greatly reduced compared to the DCT, image edges are better encoded, blocking is eliminated, and it allows lossless coding.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"2 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131958724","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.1995.504517
H. Gundrum, M. Rizkalla
The cross product representation applied to monotone functions is used to measure quantization error. This is based on relating horizontal and vertical rectangular strips, and polar angular areas. The paper details the approach using the response of a step function in a first order, single time constant, system.
{"title":"Cross product representation for numerical integration of curves with monotone characteristics","authors":"H. Gundrum, M. Rizkalla","doi":"10.1109/MWSCAS.1995.504517","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504517","url":null,"abstract":"The cross product representation applied to monotone functions is used to measure quantization error. This is based on relating horizontal and vertical rectangular strips, and polar angular areas. The paper details the approach using the response of a step function in a first order, single time constant, system.","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":"132171172","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.1995.504413
S. Shokralla, A. Sharaf, A. El-Ghaffar
The paper presents laboratory validation testing of a novel on-line tuned arm filter for efficient power tracking of nonlinear type loads. The modulation is achieved by an intelligent error driven scaled dynamic power regulator.
{"title":"Efficient power tracking using an error driven modulated passive filter","authors":"S. Shokralla, A. Sharaf, A. El-Ghaffar","doi":"10.1109/MWSCAS.1995.504413","DOIUrl":"https://doi.org/10.1109/MWSCAS.1995.504413","url":null,"abstract":"The paper presents laboratory validation testing of a novel on-line tuned arm filter for efficient power tracking of nonlinear type loads. The modulation is achieved by an intelligent error driven scaled dynamic power regulator.","PeriodicalId":165081,"journal":{"name":"38th Midwest Symposium on Circuits and Systems. Proceedings","volume":"25 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":"127641353","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}
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