Pub Date : 1995-09-05DOI: 10.1109/CCECE.1995.526309
E. Jeckeln, P.M. Ghannouchi, M. Sawan
The proposed technique is based on the use of algorithms executed by a digital signal processing circuit. A third-order spline function is deduced for application as a signal generator which can provide a predistorted equivalent output for any value or input signal. Samples of the baseband complex equivalent of the signal at the input and output of the amplifier are entered into a lookup table to serve as data for interpolating such a function. This technique affords 45 dB reduction of intermodulation products and requires only a few input and output samples for good compensation of the distortion.
{"title":"Adaptive digital predistortion technique for microwave power amplifiers","authors":"E. Jeckeln, P.M. Ghannouchi, M. Sawan","doi":"10.1109/CCECE.1995.526309","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526309","url":null,"abstract":"The proposed technique is based on the use of algorithms executed by a digital signal processing circuit. A third-order spline function is deduced for application as a signal generator which can provide a predistorted equivalent output for any value or input signal. Samples of the baseband complex equivalent of the signal at the input and output of the amplifier are entered into a lookup table to serve as data for interpolating such a function. This technique affords 45 dB reduction of intermodulation products and requires only a few input and output samples for good compensation of the distortion.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134539708","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526594
N. Zargari, D. Raonic
Three-phase current source PWM rectifier (also known as three-phase buck rectifier) is often used as the front-end in utility interfaced systems. An input LC filter is required to suppress the current harmonics injected into AC mains. The input filter affects the input displacement factor (IDF) of the system, which varies with the rectifier operating point and may result in unacceptable low values. In this paper, closed-loop control of the input line currents is proposed to achieve near unity IDF independent of the load conditions. The current reference template is generated from the filter capacitor voltages, the need for damping resistors is eliminated and efficiency is increased. The output DC current is regulated by varying the amplitudes of the current references. The proposed scheme features good steady state results, fast transient response and higher efficiency. The paper includes analysis, a design example and simulation results for steady state and transient conditions.
{"title":"A current controlled near unity power factor three-phase PWM buck rectifier without passive damping requirements","authors":"N. Zargari, D. Raonic","doi":"10.1109/CCECE.1995.526594","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526594","url":null,"abstract":"Three-phase current source PWM rectifier (also known as three-phase buck rectifier) is often used as the front-end in utility interfaced systems. An input LC filter is required to suppress the current harmonics injected into AC mains. The input filter affects the input displacement factor (IDF) of the system, which varies with the rectifier operating point and may result in unacceptable low values. In this paper, closed-loop control of the input line currents is proposed to achieve near unity IDF independent of the load conditions. The current reference template is generated from the filter capacitor voltages, the need for damping resistors is eliminated and efficiency is increased. The output DC current is regulated by varying the amplitudes of the current references. The proposed scheme features good steady state results, fast transient response and higher efficiency. The paper includes analysis, a design example and simulation results for steady state and transient conditions.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134598770","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526424
H. Dam, N. Gamaz, S. Panchanathan
Color scalability is of importance in several multimedia and image database applications. Several color mapping algorithms have been reported in the literature. However, they are not efficient for color scalability. The authors propose am adaptive cube algorithm for scalable color mapping. This algorithm is flexible and adapts to a variety of graphic display capabilities (8, 12, 16, 24 bits, etc..,) and is well suited for interactive applications.
{"title":"A scalable color mapping algorithm for image display","authors":"H. Dam, N. Gamaz, S. Panchanathan","doi":"10.1109/CCECE.1995.526424","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526424","url":null,"abstract":"Color scalability is of importance in several multimedia and image database applications. Several color mapping algorithms have been reported in the literature. However, they are not efficient for color scalability. The authors propose am adaptive cube algorithm for scalable color mapping. This algorithm is flexible and adapts to a variety of graphic display capabilities (8, 12, 16, 24 bits, etc..,) and is well suited for interactive applications.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131792846","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526403
A. Golembiowski, E. Dubois
Proposes a three-dimensional (3D) spatio-temporal subband decomposition of time-varying imagery by means of 3D non-separable filters. A subband partitioning of the image content is sought such that it exploits the distribution of the 3D spectrum of time-varying imagery for image coding and transmission. Within a subband, a discrimination of the directional distribution of the localized spectrum due to motion is considered. The authors examine a critically sub-sampled subband filter bank system with the property of near-perfect reconstruction. Non-separable 3D filter and subsampling structures are chosen for the analysis to exploit the spectral directionality. A class of QMF filter bank systems is explored with angular frequency space discriminating properties. In particular, a 3D QMF prototype is considered possessing the spectral-domain rhombic-dodecahedral symmetry. Results for selected image sequences are presented.
{"title":"Three-dimensional non-separable subband decomposition for coding of time-varying images","authors":"A. Golembiowski, E. Dubois","doi":"10.1109/CCECE.1995.526403","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526403","url":null,"abstract":"Proposes a three-dimensional (3D) spatio-temporal subband decomposition of time-varying imagery by means of 3D non-separable filters. A subband partitioning of the image content is sought such that it exploits the distribution of the 3D spectrum of time-varying imagery for image coding and transmission. Within a subband, a discrimination of the directional distribution of the localized spectrum due to motion is considered. The authors examine a critically sub-sampled subband filter bank system with the property of near-perfect reconstruction. Non-separable 3D filter and subsampling structures are chosen for the analysis to exploit the spectral directionality. A class of QMF filter bank systems is explored with angular frequency space discriminating properties. In particular, a 3D QMF prototype is considered possessing the spectral-domain rhombic-dodecahedral symmetry. Results for selected image sequences are presented.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"SE-3 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132968407","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526597
F. Wang, Qi-Jun Zhang
Unsupervised learning algorithms play a central part in models of neural computation. K-means clustering algorithms, a type of unsupervised learning algorithms, have been used in many application areas. We propose an improved K-means algorithm for optimal partition which can achieve better variation equalization than standard binary splitting algorithms. The proposed clustering algorithm was applied to combined multi-codebook/MLP neural network speech recognition system to train the LPC based codebooks. It achieved smaller variation of the variances of clusters than that from the standard binary splitting algorithm.
{"title":"An improved K-means clustering algorithm and application to combined multi-codebook/MLP neural network speech recognition","authors":"F. Wang, Qi-Jun Zhang","doi":"10.1109/CCECE.1995.526597","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526597","url":null,"abstract":"Unsupervised learning algorithms play a central part in models of neural computation. K-means clustering algorithms, a type of unsupervised learning algorithms, have been used in many application areas. We propose an improved K-means algorithm for optimal partition which can achieve better variation equalization than standard binary splitting algorithms. The proposed clustering algorithm was applied to combined multi-codebook/MLP neural network speech recognition system to train the LPC based codebooks. It achieved smaller variation of the variances of clusters than that from the standard binary splitting algorithm.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132614021","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 : 1995-09-05DOI: 10.1109/CCECE.1995.528113
J. Zhu, C. Fayomi, M. Sawan
A new current-mode 2-bit pipelined ADC's cell is presented. Its potential advantages are high-speed, low power/voltage, continuous time mode conversion, less circuit complexity and less die area. A novel cell circuitry based on current-mode has been designed. Primary results of HSPICE simulation show that an 8-bit resolution under 5-V single supply with 100 kHz sinusoidal input is achievable.
{"title":"A new current-mode 2-bit pipelined ADC's cell","authors":"J. Zhu, C. Fayomi, M. Sawan","doi":"10.1109/CCECE.1995.528113","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528113","url":null,"abstract":"A new current-mode 2-bit pipelined ADC's cell is presented. Its potential advantages are high-speed, low power/voltage, continuous time mode conversion, less circuit complexity and less die area. A novel cell circuitry based on current-mode has been designed. Primary results of HSPICE simulation show that an 8-bit resolution under 5-V single supply with 100 kHz sinusoidal input is achievable.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131138476","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526300
J. Salmon, E. Nowicki
This paper describes the operation of a resonant three-phase Y-connected thyristor network, "3/spl theta/ SCR Y-switch", that can be used to lower the line-current harmonic content of a three-phase diode bridge rectifier using AC-line inductors. The current shaping action of the 3/spl theta/ SCR Y-switch results in close to unity fundamental power factor with an input current harmonic distortion of less than 10% and close to 5%. The resonant-mode action of the 3/spl theta/ SCR Y-switch has attractive electrical characteristics in terms of a very low per-unit current rating; self-commutation of the thyristors; zero current turn-on and zero voltage turn off; 120 Hz switching frequency. These characteristics make the power converter inexpensive, reliable and useful in medium power applications such as industrial drives for controlling the speed of three-phase induction motors.
{"title":"A low distortion 3-phase rectifier using a resonant-mode Y-connected thyristor network","authors":"J. Salmon, E. Nowicki","doi":"10.1109/CCECE.1995.526300","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526300","url":null,"abstract":"This paper describes the operation of a resonant three-phase Y-connected thyristor network, \"3/spl theta/ SCR Y-switch\", that can be used to lower the line-current harmonic content of a three-phase diode bridge rectifier using AC-line inductors. The current shaping action of the 3/spl theta/ SCR Y-switch results in close to unity fundamental power factor with an input current harmonic distortion of less than 10% and close to 5%. The resonant-mode action of the 3/spl theta/ SCR Y-switch has attractive electrical characteristics in terms of a very low per-unit current rating; self-commutation of the thyristors; zero current turn-on and zero voltage turn off; 120 Hz switching frequency. These characteristics make the power converter inexpensive, reliable and useful in medium power applications such as industrial drives for controlling the speed of three-phase induction motors.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130742218","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526587
J. S. Sewall, B. Cockburn
This paper considers the problem of classifying voice-band data, facsimile, and speech signals, using discriminant functions that are extensions of those described by Benvenuto (see IEEE Trans. on Commun., vol.41, no.4, p.539, 1993). Both the central second-order moment of the rectified signal, and the low order lags of the estimated autocorrelation sequence are computed. These discriminants are used to perform classification in 128 ms. with 0% misclassification for most signal types considered. Algorithm enhancements improve classification performance, reduce computational complexity, and extend the voice-band data subclassification abilities.
{"title":"Signal classification in digital telephone networks","authors":"J. S. Sewall, B. Cockburn","doi":"10.1109/CCECE.1995.526587","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526587","url":null,"abstract":"This paper considers the problem of classifying voice-band data, facsimile, and speech signals, using discriminant functions that are extensions of those described by Benvenuto (see IEEE Trans. on Commun., vol.41, no.4, p.539, 1993). Both the central second-order moment of the rectified signal, and the low order lags of the estimated autocorrelation sequence are computed. These discriminants are used to perform classification in 128 ms. with 0% misclassification for most signal types considered. Algorithm enhancements improve classification performance, reduce computational complexity, and extend the voice-band data subclassification abilities.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132933324","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 : 1995-09-05DOI: 10.1109/CCECE.1995.528146
D. Steuerga, H. Renaudin
The article examines the transverse profiles of the electric field in the core of a waveguide loaded with a matrix of dissipative character. Transverse filling of the guide may be uniform or otherwise. The main objective is to define the operating conditions (filling factor and dielectric characteristics of the loads) minimising the transverse and longitudinal gradients of electric field in the waveguide core in order to ensure uniformity of heat treatment.
{"title":"Digital simulation of guided propagation in a dissipative medium (discretisation to the second and sixth orders with absorbent boundary conditions)","authors":"D. Steuerga, H. Renaudin","doi":"10.1109/CCECE.1995.528146","DOIUrl":"https://doi.org/10.1109/CCECE.1995.528146","url":null,"abstract":"The article examines the transverse profiles of the electric field in the core of a waveguide loaded with a matrix of dissipative character. Transverse filling of the guide may be uniform or otherwise. The main objective is to define the operating conditions (filling factor and dielectric characteristics of the loads) minimising the transverse and longitudinal gradients of electric field in the waveguide core in order to ensure uniformity of heat treatment.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133491161","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 : 1995-09-05DOI: 10.1109/CCECE.1995.526633
D. McGonigal, D. Ionescu
An outline of a system that models and forecasts stock market processes is described. The method involves a spectral estimation approach to ARMA modelling, forecasting is performed through Kalman filtering, and adaptive parameter estimation performed via the Gauss-Newton algorithm.
{"title":"An outline for a Kalman filter and recursive parameter estimation approach applied to stock market forecasting","authors":"D. McGonigal, D. Ionescu","doi":"10.1109/CCECE.1995.526633","DOIUrl":"https://doi.org/10.1109/CCECE.1995.526633","url":null,"abstract":"An outline of a system that models and forecasts stock market processes is described. The method involves a spectral estimation approach to ARMA modelling, forecasting is performed through Kalman filtering, and adaptive parameter estimation performed via the Gauss-Newton algorithm.","PeriodicalId":158581,"journal":{"name":"Proceedings 1995 Canadian Conference on Electrical and Computer Engineering","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132766343","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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