摘要:

AbstractConsider a system in whichNtime‐invariant linear circuitsHk(ω)(k=1∼N) are connected in parallel and to each of whichMparallel time‐invariant linear circuitsHkm(ω)(k=1 ∼N;m=1∼M) are connected in cascade. Then consider that a certain class of band‐limited signalsf(t) is impressed on such a system, and the equal‐interval sampled valuesgkm(nT+akm)(k=1∼N:m=1 ∼M:n=0, ±1, ±2,…;T>0;akmof the output signalsgkm(t)(k=1∼N;m=1∼M) are obtained. By multiplying the sampled values by the interpolation function Økm(t)(k=1∼N;m=1 ∼M), which is obtained by the convolution of the time functions Økm(t)(k=1∼N;m=1 ∼M), and by summing up, an approximation formulay(t) is determined.A unified investigation is made on the approximation problem usingy(t) for the responseg(t) when the original signalf(t) passes through a given filterH(ω).First, the errore(t)=g(t)‐y(t) is considered for givenHk(ω)(k=1∼N), andHkm(ω)(k=1∼N;m=1∼M) over the set off(t) belonging to the considered set of waveforms, and a formula is derived which represents the upper bound ∼max(t) of the error in a form where the interpolation functions Økm(t) and Øk(t) are separated.Then, based on the derived formula, an effective design method for the interpolation filter is established, based on the coefficient equation and linear programming, assuming that all of the interpolation filters are constructed as FIR type.Finally, the optimization of t

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractConsider a set of waveforms whose Fourier spectra are band‐limited within a certain frequency band. We assume that the weightedLpintegrals (1

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper proposes a technique of functional information extraction which transforms design description at the logic circuit level in the LSI design process to a description at functional level. This technology is considered to be a powerful means of logic design verification similar to the circuit extraction technology already in practical use for layout design verification. Moreover, by automatically generating function description language from given circuit description, it can be used in functional and fault simulations and is useful in reusing circuits.An extraction technique of logic and arithmetic functions of combinational circuits is investigated herein. As internal representation of logic functions, binary decision diagrams are used for efficient treatment. For extraction of arithmetic functions, a technique of first extracting logic functions, and then representing them by arithmetic expressions is used. This technique has a characteristic that the same function description is obtained from circuits with the same functions even though their circuit structures are different. Therefore, functional information extraction independent of circuit structure can be done.This paper describes first the extraction of logic functions, which is the basic technique, and then explains the arithmetic function extraction technique. Finally, some concrete examples are evaluated.

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper discusses the system for automatic design of the parallel/pipelined VLSI architecture based on the signal processing algorithm. A new design language is introduced into the proposed system. The language is defined so that the time variable used in the signal processing algorithm can easily be described. The system has a high modularity, and the modules can be combined into a hierarchical structure. By this scheme, the algorithm with a high complexity can easily be described.The algorithm inputted to the system may contain a backward time‐flow of the delayed data as well as a complex hierarchical structure, which makes it difficult to execute the data‐flow graph obtained directly from the algorithm by the parallel/pipelined structure.From such a viewpoint, this paper adopts the following procedure. The data‐flow graph is derived from the given algorithm. A sufficient parallelism and a highly efficient pipelined mechanism are extracted from the obtained graph. Then the parallel processing architecture is designed. As an example, a parallel/pipelined architecture is designed for a simple adaptive signal processing algorithm. The result is compared with the traditional design examples, and it is shown that the efficient data‐flow architecture is

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractRoad traffic noise has become a significant societal problem and the noise barrier as one remedy is studied acoustically. Traditionally, as a theoretical background for installing the noise barrier, the diffraction theory of the acoustic wave by a screen has been employed. In this paper, however, the noise barrier and the road structure on which a vehicle is a noise source are treated as one acoustic radiating system. By means of the boundary element method useful for an open‐region problem, a two dimensional analysis is carried out.From the results of the analysis with the cross‐sectional shape of the noise barrier and the frequency as parameters, it is found that a resonance is generated for a shape with parallel faces and the noise may be spread a large distance away in conjunction with the diffraction at the edge of the noise barrier. If an unrealistic containment is not expected and a horn shape is employed, the noise can be radiated upward in the direction normal to the road surface and the diffraction does not become significant. The frequencies studied were 150 to 300 Hz which are bothersome to the human e

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper considers the merging section of an APM (automated people mover), which is an approach to the new traffic system. The behavior of the vehicles at the merging section is modeled, and the situation, when different strategies are adopted, is analyzed using the technique of Markov chain. An APM system is considered, where the vehicles in the system do not always run individually, but sometimes run in the form of a train.This paper attempts to point out the essential dependencies of the vehicle behavior on the control strategy. It is assumed that the vehicles arrive individually. The basic idea of the control strategy is that the individually incoming vehicles are connected at the merging section. Thus the vehicle capacity of the outgoing line from the merging section is equivalently increased.As the result of analysis, the relations among the arriving traffic of the vehicles in two incoming lines, the average waiting time of the vehicles in the individual lines, the average number of connected vehicles in a train, and the density of train operations are derived explicitly. The dependencies of the average waiting time of the vehicle and the outflow traffic density of the train on different control strategies are examined.

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper discusses a design method for the small‐sized wide‐bandpass filter, which is a circuit composed of distributed‐constant transmission lines and capacitors. In this method, the wide‐bandpass filter is designed as follows.The lumped‐constantLClowpass filter is used as the prototype. To derive the mixed circuit containing transmission lines and capacitances from the prototype circuit, although approximately, the cascade section of the mixed circuit is transformed into the equivalent π‐type circuit. Then, a new frequency transformation is considered to arrive at the wide‐bandpass filter. The mixed circuit designed by this method contains cascade transmission lines and the parallel short stubs, and the cascade transmission lines have the same length. The condition for minimizing the approximation error in the design is discussed. The range of the bandwidth ratio that can be designed is examined, and the usefulness of the proposed design method is verified

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractThis paper proposes a 4‐D autonomous circuit represented by a constrained equation containing two small parameters. Various chaotic phenomena generated in this circuit are rigorously analyzed. This circuit contains two diodes and their ON resistance corresponds to the parameter. Here, an ideal case is considered in which the ON resistance of the diode is 0. In such a case, the circuit equation can be represented by a 2‐D equation in a piecewise manner and the Poincaré map can be extracted as a 1‐D map. The shape of this map is that of logistic map. By means of the latter, the generation of the period‐doubling bifurcation and chaos observed in the circuit experiment can be rigorously e

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractA prioriestimation is presented for a computational complexity of the homotopy method applied to a certain class of hybrid equations for nonlinear strongly monotonic resistive circuits.First, an explanation is given as to why a computational complexity of the homotopy method cannot bea prioriestimated for calculating solutions of hybrid equations in general. In this paper, the homotopy algorithm is considered in which a numerical path‐following algorithm is executed based on the simplified Newton method. Then by introducing Urabe's theorem, which gives a sufficient condition guaranteeing the convergence of the simplified Newton method, it is shown that a computational complexity of the algorithm can bea prioriestimated when applied to a certain class of hybrid equations for nonlinear strongly monotonic resistive circuits whose domains are bounded.This paper considers two types of path‐following algorithms: one with a numerical error estimation in the domain of a nonlinear operator; and one with a numerical error estimation in the range of the opera

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY

摘要:

AbstractDuring the late 60s and throughout the 70s, the field of circuit simulation has advanced in step with the increase in the use of analog integrated circuits. The general purpose circuit simulator SPICE was released in this period. During the 80s, in addition to pure analog circuits, digital and mixed analog‐digital VLSI circuits also saw dramatic increases in usage. In this paper, we will discuss the roles that manufacturers are coming to expect that circuit analysis techniques will play in the development of VLSI circuits. Specifically, we will consider the limitations that general purpose simulators like SPICE have and enhancements needed in the future. We will consider these limitations by specifically considering problem analysis methods developed for each limitation. Finally, we present ideas for future wor

ISSN:1042-0967    

DOI:10.1002/ecjc.4430741110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1991

数据来源: WILEY