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Iee Journal on Computers and Digital Techniques最新文献

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Tabular method for evaluation of incomplete address decoding in microprocessor systems 微处理器系统中不完全地址解码评定的表格方法
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT.1979.0056
J. Nelson
A tabular method is described which permits immediate evaluation of the consequences of incomplete address decoding in microprocessor systems. The method is easy to apply and aids microprocessor system design in several ways: (a) the minimal address decoding requirements for a given system can be readily determined (b) undesirable simultaneous addressing of more than one device is avoided (c) address ranges which are available for system expansion are immediately apparent (d) if the available ranges are inadequate, the required additional decoding is readily determined.
描述了一种表格方法,它允许在微处理器系统中立即评估不完全地址解码的后果。该方法易于应用,并在几个方面帮助微处理器系统设计:(a)可以很容易地确定给定系统的最小地址解码要求(b)避免了多个设备的不希望的同时寻址(c)可用于系统扩展的地址范围立即明显(d)如果可用范围不足,则所需的额外解码很容易确定。
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引用次数: 0
6th annual symposium on computer architecture 第六届计算机体系结构年度研讨会
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT:19790058
G. Rao
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引用次数: 33
Adaptive-channel-capacity store-and-forward buffers 自适应通道容量存储转发缓冲区
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT.1979.0052
K. Sohraby
A store-and-forward message-switching system is considered, in which the capacity of a channel can be changed dynamically in response to the number of messages awaiting transmission. Three different control strategies are considered. In one, the channel capacity is decided at fixed intervals of time; in the second, the interdecision intervals are random but conform to a fixed distribution; in the third, the decision is made on the arrival and departure of each message. The three strategies are analysed and compared.
考虑了一个存储转发消息交换系统,该系统中信道容量可以根据等待传输的消息数量动态变化。考虑了三种不同的控制策略。在一种方法中,信道容量以固定的时间间隔确定;决策间区间是随机的,但服从固定的分布;在第三种情况下,对每个消息的到达和离开做出决定。对这三种策略进行了分析和比较。
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引用次数: 2
Segmentation of terrain images using textural and spectral characteristics 利用纹理和光谱特征分割地形图像
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT:19790055
D. Mason
A method is presented for the segmentation of serial photographs of terrain on the basis of textural as well as spectral characteristics. The method addresses the problems of determining an optimum texture window size, avoiding misclassified areas near region boundaries (owing to the texture window overlapping two or more regions), and coping with textured and untextured regions co-existing in the same scene. The technique is illustrated by an example.
提出了一种基于纹理特征和光谱特征的地形序列图像分割方法。该方法解决了确定最佳纹理窗口大小、避免区域边界附近的误分类区域(由于纹理窗口重叠两个或多个区域)以及处理同一场景中纹理和非纹理区域共存的问题。通过实例说明了该技术。
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引用次数: 8
4th international conference on software engineering 第四届软件工程国际会议
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT:19790060
D. Cook
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引用次数: 48
Identification of multidimensional time series and its application in computer graphics 多维时间序列的识别及其在计算机图形学中的应用
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT.1979.0054
I. Witten, C. Corbett
This paper extends the well-known technique of linear signal analysis by predictive filtering to the case where the signals are multidimensional. The properties of the simplest possible multidimensional filter, with a 2-dimensional input and of first order, are examined in detail. It is shown that such filters generate linearly deformed logarithmic spirals, including conies as a special case. The technique can be used to identify segments of such curves drawn freehand in a computer graphics environment; and a system which incorporates it is described. One of the most useful features of the system is its ability to transform the curve by controlling the amount of spiralling, rotation, scaling and translation, on command from the user; this is easy to do because the geometric properties can be calculated from the predictive filter coefficients.
本文将线性信号的预测滤波技术推广到多维信号的分析中。详细研究了具有二维输入和一阶输入的最简单的可能的多维滤波器的性质。证明了这种滤波器可以生成线性变形的对数螺旋,包括作为特例的圆锥。该技术可用于识别在计算机图形环境中徒手绘制的此类曲线的段;并描述了一个集成了该系统的系统。该系统最有用的功能之一是它能够根据用户的命令通过控制螺旋、旋转、缩放和平移的数量来变换曲线;这很容易做到,因为几何属性可以从预测滤波器系数中计算出来。
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引用次数: 1
5th Symposium on microprocessors and microprogramming 第五届微处理器和微程序设计研讨会
Pub Date : 1979-12-01 DOI: 10.1049/IJ-CDT:19790057
P. Depledge
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引用次数: 0
Concerning low-order spectral coefficients 关于低阶谱系数
Pub Date : 1979-10-01 DOI: 10.1049/IJ-CDT.1979.0041
J. Muzio
Standard methods for Rademacher-Walsh spectral coefficients involve n2n operations to deduce the complete spectrum for a function of n variables. The number of operations required to evaluate only the low-order coefficients is discussed in this paper and an exact result for the number of operations in the evaluation of all coefficients of orders up to z (for some z less than n) is deduced. Although the number of operations is considerably reduced, data structures of greater complexity are required.
Rademacher-Walsh谱系数的标准方法涉及n2n个操作,以推断n个变量的函数的完整谱。本文讨论了仅求低阶系数所需的运算次数,并推导了求z以下所有阶系数(对于z小于n的某些系数)所需的运算次数的精确结果。虽然操作的数量大大减少,但需要更复杂的数据结构。
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引用次数: 2
Method for the diagonosis of a single intermittent fault in combinatorial logic circuits 组合逻辑电路中单个间歇故障的诊断方法
Pub Date : 1979-10-01 DOI: 10.1049/IJ-CDT:19790039
P. Lala, J. Missen
The paper presents a technique, based on probability theory, which detects a well behaved intermittent fault in combinatorial logic circuits. The procedure employs repeated applications of tests that detect solid faults in the circuit. The time period, during which a test is repeatedly applied, depends on the probability of detection desired and is derived from the Poisson distribution of statistics. The percentage of faults located using repeated tests via software simulation agrees very well with the statistical prediction.
本文提出了一种基于概率论的组合逻辑电路间歇故障检测方法。该程序采用重复应用测试来检测电路中的固体故障。重复应用检验的时间周期取决于期望检测的概率,并由统计量的泊松分布导出。通过软件模拟,通过重复测试定位出的故障百分比与统计预测非常吻合。
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引用次数: 2
B.C.D. multipliers B.C.D.乘数
Pub Date : 1979-10-01 DOI: 10.1049/IJ-CDT.1979.0049
M. B. Webster, P. W. Baker
B.C.D. versions of known multiplier designs are presented; both achieve fast multiplication times without the high hardware cost typically associated with high speed. Serial b.c.d. addition and r.o.m. single-digit multipliers permit the substantial reductions in hardware cost, while higher clock frequencies offset the inherent slowness of the serial methods. Greatest cost-effectiveness is seen to be achieved through l.s.i. implementationn of a serial design which is easily extended for higher radix b.c.d. multiplication.
给出了已知乘法器设计的B.C.D.版本;两者都实现了快速乘法,而没有高硬件成本,通常与高速相关。串行b.c.d.加法和r.o.m.个位数乘法器允许大幅降低硬件成本,而更高的时钟频率抵消了串行方法固有的缓慢性。最大的成本效益被认为是通过串行设计的简单实现,它很容易扩展到更高的基数b.c.d.乘法。
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引用次数: 0
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