摘要:

AbstractWhen the information of a color imaging system is efficiently stored or transmitted, it is desirable that the image information which is decomposed into three primaries is transformed for transmitting primaries and its signal is processed and transmitted so that it is compatible with the visual and channel properties. In color imaging systems (color TV's), R, G, B, primaries are transformed into a luminance signal and chrominance signal while allocating the bandwidth and the value of the transmission signal to them for broadcasting. In this paper, when the three primary signals to be transmitted consist of a luminance and two chrominance components, we propose a method to quantitatively deal with these transmission signal values, an experiment, and the results of observation. In addition, we describe the results of an examination of how to allocate signal values for multiplexing the primary signals based on the above observation. Also, we examine what property and performance the standard color TV signals possess for various transmission systems. The above discussion is effectively applicable to the selection of the transmission primaries or the form of the transmission system for new color imaging systems of the future.

ISSN:8756-6621    

DOI:10.1002/ecja.4410640112

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

年代:1981

数据来源: WILEY

摘要:

AbstractA finite element model suitable for solving the inverse problem of electrocardiography is proposed. The body field is divided into two regions, the region without current source which is exterior to the heart and the cardiac region where the current sources are present. For the former region, the finite elements are so constructed that the discretized transfer matrix between the body surface nodes and the epicardial nodes can be uniquely determined. For the cardiac region, the treatment is basically the same as the former in the sense that the number of nodes assigned to the cardiac current sources within the heart is taken to be identical to that of the epicardial nodes. This arrangement provides a unique solution, though special devices for high‐order elements must be carefully arranged. Transfer characteristics that relate the surface potentials to the current sources are thus achieve

ISSN:8756-6621    

DOI:10.1002/ecja.4410640113

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

年代:1981

数据来源: WILEY

摘要:

AbstractSmall‐size high‐efficiency DC‐DC converters have been used widely as power sources of various electronic devices. However, because of their large start‐up inrush current and high overshoot of the output voltage, the reliability of the power source and the device is low. In this paper, the generation mechanism of the large inrush current and high overshoot of the output voltage is investigated for the buck‐type DC‐DC converter. It is found that in the converter without feedback circuit, the maximum inrush current is proportional to the product of the switching transistor's ontime ratio and the input voltage. In the converter with the feedback circuit, three types of different operating modes appear depending on the magnitude of the feedback constant. The large inrush current and high overshoot of the output voltage can be suppressed sufficiently by adding a simple integrator to the pulsewidth cont

ISSN:8756-6621    

DOI:10.1002/ecja.4410640114

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

年代:1981

数据来源: WILEY

摘要:

AbstractThe “photo‐excited” DLTS using light with energy less than the bandgap gives different spectra from the majority carrier DLTS spectra. This is because the transient response magnitudeP(T)depends on temperature and the conventional DLTS analytical method cannot give correct activation energyEtand capture cross‐section σtfor the deep levels. Herein the temperature‐dependence ofP(T)is considered and the methods for obtainingEtand σtfor minority carrier traps from the photo‐excited DLTS spectra have been proposed. These methods have been applied and found suitable to the derivation ofEtand σtof the Fe‐level in a GaAs p+n junction and by comparing the results with those from the injection DLTS, its appropriateness is confirmed. Also the detection sensitivity and measurable levels are given as functions of the incident light energy. When these are compared and checked with the conventional DLTS method, the photo‐excited DLTS has been established as a measurement approach of mino

ISSN:8756-6621    

DOI:10.1002/ecja.4410640115

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

年代:1981

数据来源: WILEY

摘要:

AbstractFor the purpose of miniaturization of DC servomotors with slotted armatures of the side‐leg type, a numerical analysis is made, taking into account magnetic circuit configurations and materialsi;the magnetization characteristics of each section are obtained and the optimum circuit design conditions are specified.For a side‐leg type structure using the rare‐earth magnet, the numerical analysis is made using the difference method and the circuit is divided into main and leakage portions. The design approach is to deal first with the main circuit, in which magnetic saturation is considered, and then to consider the leakage circuit, with the operating points of the magnet made equal. The structure as related to leakage permeance is specified quantitatively. For the armature tooth section constituting the main circuit is analyzed, considering saturation, and the flux density distribution together with the magnetic potential drops as the air‐gap flux increases, are obtained for each section. Based upon these analytical results, the optimum circuit design conditions to yield the maximum power rate‐to‐weight ratio are demonstrated and the relation between material and performance limitation

ISSN:8756-6621    

DOI:10.1002/ecja.4410640116

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

年代:1981

数据来源: WILEY

ISSN:8756-6621    

DOI:10.1002/ecja.4410640101

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

年代:1981

数据来源: WILEY