SU1640724A1 - Device to read coordinates from the cathode-ray display - Google Patents

Abstract

The invention relates to automation and computer technology and can be used in ships collision warning systems to retrieve elevation coordinates from a circular view indicator screen and further enter them into a computer. The purpose of the invention is to improve the speed and reliability of the device. The goal is achieved by eliminating the movement of the marker beyond the edge of the screen, which is ensured by introducing the first and second OR elements, switches, Cartesian coordinates to polar coordinates, the decoder, and the second group of OR elements. 1 hp ff, 1 ill.

Description

The invention relates to automation and computing and can be used in devices for retrieving coordinates from the screen of an indicator of any type.

The purpose of the invention is to increase the speed and reliability of the device.

The drawing shows the block diagram of the device.

The device comprises a block 1 specifying coordinates, channels 2, 3 determining the coordinates X, Y, respectively, the decoder 4, the first element OR 5, the transducer 6 Cartesian coordinates into polar and the second element OR 7.

The composition of each channel 2,3 includes switches 8, including the first 9, second 10 and third 11 elements AND, the first 12 and second 13 elements OR, elements 14, delay elements 15, elements OR 16 forming the first

the group of elements OR, the reversible counter 17, the first 18 and second 19 triggers, forming the first and second group of device triggers, respectively. In addition, the drawing shows the second group of elements OR 20, 21 and shows the inputs 22 and outputs 23-25.

The device works as follows.

The initial setup shaper (the Start button on the operator’s console) sets the initial values for the counter counter bits needed to display the marker at the starting point of the screen,

The operator rotates the ball of the sensor of the rectangular coordinates of block 1 and forms pulse sequences X and Y corresponding to the direction and speed of rotation of the ball. Each of them (L

with

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the pulses are fed to the input (for example +) of the corresponding trigger 19 and throws it. The next pulse through the trigger 19 cannot pass. The potential from trigger 19 goes to the second input of elements 11, 14, and at the first input of element 14 there is already that impulse as at the input of trigger 19 (the pulse duration is longer than the flip-flop time of the trigger). Thus, at the output of the element 14, a pulse is formed, arrives at the summing input of the reversible counter 17 and increases the code in it.

The same pulse through the ILP element 16 and the delay element 15 is fed to the element OR 5 and then to the control input of the 6 decarto converter

coordinates to polar, converting the codes of rectangular coordinates to polar, then through i the element OR 7 to the output of the device (for indicator synchronization), prohibiting the use of coordinate codes for display. The absence of a ban on this output is the permission to receive the X, Y codes for the indicator on which the marker is displayed,

From the converter 6, the code goes to the decoder 4, producing at the output of one of the elements OR 20, 21 a corresponding signal,

The signal from the element OR 20 enters through the elements OR 12 and 13 to the installation inputs of the flip-flops 18 and 19, driving them into account readiness.

If the marker is at the extreme range, the signal from the OR 21 element is fed to the first inputs of the AND elements 10, 11, but it passes to the output only in that AND element, at the second

from with

the entrance of which is appropriate

There is a trigger resolution.

Claims (2)

Invention Formula A device for retrieving coordinates from a screen of a cathode ray tube containing reversible counters in X and Y coordinates, the summing inputs of which are connected to the outputs of the corresponding Elements And, the coordinate setting unit, the outputs of which are connected to the direct inputs of the corresponding triggers of the first and second groups, elements OR The first group and the delay elements are characterized in that, in order to increase the speed action and reliability of the removal of coordinates, it contains the first OR element, the inputs of which are connected to the outputs of the corresponding delay elements, the converter of Cartesian coordinates into polar, the information inputs of which are connected to the outputs of the reversible counters, and the synchronizing 0 five 0 five 0 five 0 five the input is connected to the output of the first element OR, the decoder, the information input of which is connected to the output of the Cartesian coordinate to polar converter, the switches, the clock inputs of which are connected to the device setup input, the first control inputs connected to the corresponding outputs of the coordinate setting unit, the second control inputs connected to the direct output of the corresponding trigger of the first group, the third control inputs are connected to the direct output of the corresponding trigger of the second group, the first outputs switches are connected to the subtractive inputs of the corresponding reversible meters and one input of the corresponding OR elements of the first group, the other inputs of which are connected to the outputs of the corresponding AND elements, and the outputs are connected to the inputs of the corresponding delay elements, the second OR element whose inputs are connected to the first output of the switches elements AND groups, and the output is the output of the device, and the second group of OR elements, whose inputs are connected to the outputs of the decoder, and the outputs They are not connected with the first and second information inputs of the corresponding switches, the second and third outputs of which are connected to the inverse inputs of the corresponding triggers of the first and second groups. 2. The device is according to l, 1, about tl and -, so that each switch contains a first AND element, one input of which is the first control input of the switch, the other is the second control input of the switch, and the output is The first output of the switch is the first OR element, one input of which is the first information input of the switch, the other one is the synchronization input of the switch, and the output is the second output of the switch, the second AND element, one input of which 51 is the second information input of the switch, the other is connected to the second control input of the switch, and the output is connected to one input of the second OR element, the other inputs of which are connected to the first information input of the switch and the synchronization input of the switch the course is the third output of the switch, and the third AND element, one input of which is the third control input of the switch, the other is connected to the second information input of the switch, and the output is connected to the third input of the first OR element.