SU1198508A2 - Device for tolerance comparing of numbers - Google Patents

Abstract

DEVICE FOR COMPARE: NUMBERS WITH ADMISSIONS | by author. ev No. 1133591, characterized in that, in order to expand the field of application of the device by providing the possibility of comparing numbers with signs, into which an adder is entered, the outputs of which are connected to the first groups of inputs of all comparison circuits, and the inputs of the first and second groups are connected respectively to the inputs of the compared the numbers and the inputs specify the lower limit of the device interval.

Description

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The invention relates to automation and computing, can be used to build a scientific research institute of technical means of discrete automation and computing and is an improvement of the device according to author. No. 1133591.

The purpose of the invention is to expand the field of application of the device by making it possible to compare numbers with signs.

The drawing shows a block diagram of the device.

The device contains the inputs 1 of the compared number, the bus 2 sets the limits, the comparison circuit 3, the elements 4, elements 4 and 5, the outputs 6 of the device, the adder 7, the inputs 8 sets the lower limit of the interval of the device.

Comparison schemes 3.1, 3.2, .. ,, 3.N are intended for comparing i-bit binary numbers and are performed on binary combinational adders whose overflow outputs are outputs of the comparison circuits. The use of adders allows the device to be used to compare numbers given in any binary code with natural weights. As the circuits 3, any combinational circuits for comparing the numbers A and B can be used at the output of which sig are formed. rolls A 8 and A 4 8 or A 8 L

The adder 7 is designed to display an arbitrary range of values of the compared numbers in a non-negative and is a standard functional element.

Elements 4 and 5 are standard logic elements. Thus, the proposed device can be implemented on standard integrated circuits, for example, 155 series.

The device works as follows.

It is known a priori that the compared number V lies in the interval (-Af ,,, AQ), where M is some natural number. Also known are the limits A f, jN N-1) j At given by algebraic numbers that are interrelated with respect to Mn Af, -... A, AO The device determines the position of the number X relative to the specified limits and forms

output vector, whose components are determined by the rule

p, if Xe (A, A,:, 10.) “K (A, A,.,

, 2 ,.

In the initial state, the direct binary code of the number-A is supplied to the inputs of the device 8. The device inputs 2.1, 2.2, ..., 2.N are fed in the reverse binary code respectively

B, A, / - An. ,,, /,., V. Am - / - A | h, /

which are non-negative .. numbers.

Q When applying the number X to the inputs of the device 1 in the additional binary code on the output of the adder 7, a binary number is formed which lies in the interval (0, / - Am, /) if

5 the number X is negative, and lies in the half-open interval / -A n / AQ + + / -A f., /) If the number x is non-negative. Thus, regardless of the sign of the number X, the number X is always non-negative.

The limits B, 2, t n are fed to the first inputs, respectively, of the comparison circuits 3.1, 3,2, ..., 3.N, the second inputs of which receive the number X,. At the same time, at the outputs of the circuits

 Comparison signals are formed

R; (-iN) according to the following rule:

Go, if 3 J, if 0; .

The signals Pj arrive at the logic circuit consisting of the elements HE 4 and elements 5 and 5, which at the outputs 6 of the device generate output signals.

Consider generating output signals for all logically possible cases.

If, or equivalently, Aii x, then low potentials are formed at the outputs of all comparison circuits 3, which are fed to the inputs 55 of the corresponding elements NOT and to the first inputs of the corresponding elements And 5, which leads to the formation of a high potential at output 6.1 and low potentialities all other outputs of the device, i.e. the device generates signals-Ch 0 уст X, lies in an arbitrary half-open interval (g), or the same thing, (Ag Ag). At the same time, the outputs of the comparison circuits 3.1, 3.2, .. 3, E-1, high potentials are formed, which lead to the formation of corresponding NOT elements of low potentials at the outputs. The low potential at the output of the element HE 4.1 provides a low potential at the output 6.1. From the outputs of elements NOT 4.2, 4.3, ... 4.B-1, low potentials arrive at the second inputs of elements AND 5.1, respectively. 5.2, ..,, 5.й-2, which leads to the formation of low potentials and outputs 6.2, 6.3, ..., 6.-1. At the outputs of the comparison circuits 3.t, З.Е + 1, ..., 3. N formir (comfort with low potentials that arrive at the first inputs of the elements I5.С, 5.В + 1 ..., 5N-1, respectively , which leads to the formation of low potentials at the outputs 6.2 + 1, 6.8 +2 ", .., 6.1. The low potential at the output of the comparison circuits 3.M provides a low potential at the output 6, N4-1, At the output 5. A high potential, since the first and second inputs of element I of And 5.6-1 receive high potentials, respectively, from the output of the comparison circuits 3.6-1 and from the output of the element HE 4.C, to the input of which a low potential From the comparison circuit ZV. Thus, the device generates signals, 4e Y 1Ue42 ° Y and If X, BI, or, equivalently, x A, then high potentials are formed at the outputs of all the 3 comparison circuits, which are fed to the inputs of the corresponding elements NOT and form low potentials at their outputs. Low potential at the output of the element HE 4.1 provides a low potential at the output 6.1. Low potentials from the outputs of the elements HE 4.2, 4.3, ..., 4.N are fed to the second inputs AND 5.1, respectively . 5.2, ..., 5.N-1, which leads to the formation of low potentials at the outputs 6.2, 6.3, .... The high potential at the output of the 3.N comparison circuit ensures a high potential at the output of 6.N + 1. Consequently, the device generates signals :: Y, 0, d.; And so, the device generates output signals in accordance with rule (1). If the number X is represented in the reverse binary code, then the codes of the device 8 are supplied with the number - (A, ..., -, I) in the forward code. The operation of the device does not change. The proposed device allows to determine the position of the compared number relative to the specified limits, taking into account their signs, thereby expanding the field of practical application of this device. In addition, this device has simpler operation logic in comparison with devices in which the analysis of characters occurs after comparing the numbers in the analyzers, and. as a consequence, a simpler structure.

Claims (1)

DEVICE FOR COMPARISON! NUMBERS WITH TOLERANCES (by ed. No. 1133591, characterized in that, in order to expand the scope of the device by providing the possibility of comparing numbers with signs, an adder is inserted into it, the outputs of which are connected to the first groups of inputs of all comparison circuits, and the inputs of the first and second groups are connected respectively to the inputs of the compared numbers and · inputs of the task of the lower boundary of the interval device.