SU746627A1 - Device for shaping circular scale on crt screen - Google Patents

Description

I

The invention relates to television equipment, namely television reproducing devices, and can be used in various television indicators.

In various devices, when forming dynamic images on the screen of a television indicator to read the parameters in a rotated coordinate system, it becomes necessary ({to adjust the circular scales.

The circular scale can be used in a television flight indicator, where the imitation of the roll of the aircraft is carried out by turning the sky and the earth and the change of the roll of the aircraft is measured on a circular scale.

A device for forming a dial scale on a CRT screen is known, comprising a turn line driver and a circle generator i.

A disadvantage of the known device is a large amount of equipment.

The closest in technical essence to the present invention is a device for forming a dial scale on a CRT screen containing a swivel line former and a circle generator, the outputs of which are connected to the first and second inputs of the AND element, respectively.

The disadvantage of the known device is the possibility of forming only one

to a rotary segment (an increase in the number of formed segments considerably complicates the device, and, most importantly, worsens the accuracy characteristics of the device).

The purpose of the invention is to improve the formation accuracy.

The goal is achieved by the fact that the device contains two counters, the inputs of which are connected to the inputs of the rotary line former and the circumference generator, two arithmetic units, the inputs of which are connected to the outputs of the counters, two comparison units, the first inputs of which are connected; ; 3:, ---.,. - - the outputs of the corresponding arithmetic units, and the second inputs are interconnected and are the device input, the OR element, whose inputs are connected to the outputs of the comparison blocks, and the output to the third input of the AND element, and the digitizing unit, the first, second and third inputs connected to the outputs of the first and second comparison blocks and a circle generator, respectively, and the output is connected to the fourth input of the element I. In FIG. 1 shows a functional diagram of the device; in fig. 2 - circular scale with indication of the input voltage of the device, determining its position and. geometric dimensions in the plane of the screen; in fig. 3 shows the algorithm for obtaining the code sequences necessary for forming the marks of the dial scale (Figs. 2 and 3 are given to clarify the principle of operation of the device). The device contains the first counter 1, the second counter 2, the circumference generator 3, the first arithmetic unit 4, the second arithmetic unit 5, the first comparison unit 6, the second comparison unit 7, element 8 OR, element 9 AND, the turning line generator 10 and digitizing unit 11 . The device works as follows. The input commands defining the coordinates of the center of the dial are in the form of digital codes to the inputs of binary counters 1 and 2, on. the other counting inputs of which are supplied with pulse bursts synchronized by the horizontal and vertical sync pulses, respectively. At the output of the 1 - line counter, a binary code is obtained that changes linearly with a horizontal scanning period. From the 2 - frame counter, a binary code is also obtained that changes according to a linear law with a frame scanning period, as well as an inverse one. Binary Parallel codes of counters (in Fig. 3, marked A and B) are fed to the inputs of arithmetic units 4 and 5. Expressions A and B are sigals that change EU in time according to the sweep voltage or current that Television sweeps are sawtooth deflection voltages varying with the frequency of rows and frames, respectively. A - Ux (t) -Ux B - Uy (iVUy 7.. At Uy tt) - constants of the CX and 6 coefficients; TCTP and Kagp - the duration of the horizontal and vertical sweeps. U., and and are input commands defining the coordinates of the dial scale on the television screen. Control of the line passing through the first and third square through a point with coordinates x and y corresponding to the stresses Uj. and uy. Klt). (T), j () Therefore, to obtain the labels of a circular scale located in the first and third quadrants, it is necessary to sum up the expressions A and B with the coefficients proportional to the sine and cosine of the angle of inclination of the line representing the scale marks. FIG. Figure 2 shows the algorithm for constructing the matrix of adders included in the arithmetic unit 4. The number of adders to k is determined by the required number of H marks of the circular scale. Equation (1) will be written, corresponding to the transformations,, - 1 Nav-bv1-a O / avO /) (() P vadratichnoe. The dependence of the factors gives a slight irregularity of the location of the labels of the dial, not exceeding 1%. Output binary codes totalizers of the arithmetic unit 4 are supplied to the inputs of the comparison unit 6, the other inputs of which are combined and the conditional code zero is fed, i.e. zeroes are supplied to all bits except the oldest, and the unit is supplied to the major one. The summators of the arithmetic block 5 are similar to the summator arithmetic of block 4, with the difference that equation (1) to get scale marks in the 2nd and 4th quadrants will be written: A -s-in / 5o5 / O, so the direct code from the counter is fed to the input of the arithmetic unit 5. 1 and

inverse from counter 2. The outputs of the adders of the arithmetic unit 5 are connected to the inputs of the comparison unit 7, the conditional code zero is fed to the other inputs of this comparison unit, as in block 6, From the outputs of the comparison blocks, the video pulses of the turning lines are fed to the inputs of the element 8 OR, c the output of which the pulses of illumination beam lines with. the center at points x and y, corresponding to the commands DX and Uy, are sent to element 9 I, to the other inputs of which signals are sent from a circle generator, representing the illumination pulses of three concentric circles, the radii of which are distinguished by the length of the dial marks. The position of the center of the circles is determined by the commands and X and Uy.Ha input of the element 9 is supplied with a video pulse of the turning line from the shaper 10, the center of rotation of which is also determined by the UK and U commands in the size of the rotating segment is determined by the diameter of the smaller circle of the generator 3.

The pulses of the greatest circle q of generator 3 and the video pulses from blocks 6 and 7 of the comparison, corresponding to the labels next to which are displayed, i.e., these video pulses together form the familiarity, defining the position of the numbers on the television the screen. The video pulses of the flare of these figures are fed to the input of element 9 I. The video pulses of the glare of the digitized dial scale (Fig. 2) are obtained at the course of element 9 I. The invention allows to expand the functionality of the device, to reduce the amount of equipment on board the aircraft by replacing the traditional devices with a round electronic scale, allows you to improve the quality. aircraft control systems, as in many cases, rectilinear scales are unacceptable, for example, in the case of a roll display

Introduction to the device of two arithmetic units allows you to synthesize a circular scale with a predetermined accuracy without time-consuming adjustment of the device during manufacture. The digital solution of the device circuit allows it to be made in a micromodular version, which reduces the volume of the equipment and increases the reliability of the device as a whole.

Claims (2)

Invention Formula Circular Forming Device Scales on the screen of a CRT that contains a rotary line driver and a circle generator, the outputs of which are connected to the first and second inputs of the And element, respectively, which indicates - so that, in order to improve the accuracy of the formation, the device contains two counters, the inputs of which are connected to the inputs of the rotary line former and the circle generator, two arithmetic units, the inputs of which are connected to the outputs of the counters, two comparison units, the first inputs of which are connected to the outputs of the corresponding arithmetic units, and the second inputs are interconnected and are the device input, the OR element, whose inputs are connected to the outputs of the comparison units, and the output - to the third input of the element And ,, and the digitizing unit, the first second and third inputs of which are connected to the outputs of the first and second comparison units and the circle generator, respectively, and the output is connected to the fourth input element a I. Sources of information taken into account during the examination 1. USSR author's certificate No. 459786, cl. Q About K 15/20, 1974. 2. USSR author's certificate number 410572, cl. H 04 Ts5 / 22, -1973 (prototype). 746627 Fig. / I