SU1091177A1 - Device for displaying digital information on crt screen - Google Patents

Abstract

A DEVICE FOR DISPLAYING GRAPHIC INFORMATION ON THE SCREEN ELECTRON-BEAM TUBE (CRT), containing a register, the first output of which is connected to the input of the converter codes, the first and second outputs of which are connected respectively to the first inputs of adders along the X and Y coordinates, and the third output of the floor slots, and the third output of the coaxial X and Y, respectively, the first and second outputs are connected respectively to the first inputs of adders in the X and Y coordinates, and the third outlet is equipped with the X and Y slots, and the third output is connected to the first and second outputs of the X and Y coordinates, and the third output is connected to the X and Y coaxes, and the third output is connected to the first and second outputs of the X and Y coordinates, and the third output is connected to the X and Y coaxes, and the third output of the coaxial transducer the first counter, the second input of which is connected to the first output of the trigger, the third input with the output of the first element AND and the second inputs of adders in the X and Y coordinates, and the outputs of the first counter are connected to the inputs of the second An element whose output is connected to the register input and the first trigger input, the second input of which is the first input of the device, and the second trigger output connected to the first input of the first And element, the second input of which is connected to the pulse generator, the second and third register outputs are connected respectively with the third inputs of adders at coordinates X and Y, the outputs of which through digital-to-analog converters are connected to deflection systems of a CRT, and an amplifier of illumination signals, connected to a CRT modulator, different the fact that, for the purpose of display accuracy, it contains the element OR, the second counter, the third, the fourth and the fifth and the AND elements, the first inputs of which are connected respectively to the fourth, fifth and sixth outputs of the register, the second inputs to the second output trigger, and the outputs through the% OR element are connected to the input of the backlight amplifier, the third input of the fourth element AND is connected to the output of the first element AND and the first input of the second counter, the second from the input of which is connected to the first output of the trigger, and the output to the third input p of the element I. vj

Description

i The invention relates to computing and can be used to display graphic information on the screen of a cathode ray tube. Such display devices are widely used in automated air traffic control systems. Graphic information is displayed on the screens of indicators in the form of velocity vectors of air objects, lines of the controlled area, maps of meteorological conditions, motion corridor contours, etc., which is necessary for the effective solution of air traffic control problems. A device for displaying graphical information on a CRT screen is known, which contains a register, reversible counters of channels X and Y, digital-to-channel converters, a projection length counter for pulse generators, a frequency divider, a zero allocation unit, a gate, and a switch Q. The disadvantages of this device include low accuracy and quality of information display. In the known device, the increments of the vectors by one component are formed with the frequency f, and with the other with the frequency f / k, where k depends on the angle of inclination of the vector to the coordinate axis. But in most cases, f is not divided without remainder; therefore, there are errors displaying vectors in magnitude and direction. The second disadvantage of the known device is the difficulty of setting the source data: the vector is determined by the five parameters that need to be prepared using additional equipment. The closest in technical essence to the present invention is a device containing a counter, a allocation unit zero, a register, a trigger. ratios, counters, adders on X and Y coordinates, respectively, connected to code shifts on X and Y coordinates, which are associated with the register and digital-analog converters, comparator unit, switchboard and decoder, respectively, connected to each other 2j . A disadvantage of the known device is that all graphical information is displayed by the same solid lines. This makes it difficult or impossible to unambiguously perceive information. For example, in the case of simultaneous display on the screen of the boundary of the controlled area, a map of the area and a map of meteorological conditions, the operator cannot distinguish one line from another, read all graphic information quickly and correctly. The purpose of the invention is display accuracy as well as expanding the field of application of the device by providing display of graphical information with different types of lines. The goal is achieved by the fact that the device for displaying graphical information on a CRT screen contains a register, the first output of which is connected to the input of the code converter, the first and second outputs of which are connected respectively to the first inputs of adders in the X and Y coordinates, and the third output is from . the first input of the first counter, the second input of which is connected to the first output of the trigger, the third input - with the output of the first element AND and the second inputs of adders at coordinates X and Y, and the outputs of the first counter connected to the inputs of the second element And, the output of which is connected to the input of the register and the first trigger input, the second input of which is the first input of the device, and the second trigger output is connected to the first input of the first element AND, the second input of which is connected to the pulse generator, the second and third outputs of the per gist are connected Correspondingly, with the third inputs of the adders at the coordinates X and Y, the outputs of which through digital-to-analog converters are connected to the deflecting systems of a CRT and a backlight amplifier connected to a CRT modulator, the element OR, the second counter, the third fourth and fifth elements I, the first inputs are entered which are connected respectively with the fourth, fifth and sixth register outputs, the second inputs with the second trigger output, and outputs through the OR element are connected to the input of the backlight amplifier, the third input of the fourth element And the ene yield a first AND gate and the first input of the second counter, a second input coupled to pervm trigger output, and output - with a third input of the fifth element 3 I. Ha VNG. I priediaya scheme liridomegii device; in fig. 2-4 eio circuit parts. Devices 9 for displaying graphical information on a CRT screen contain CRT 1, qi analog to analog converters 2 and 3, adders 4 and 5, first counter 6, pulse generator 7, first and second elements AND 8 .1 9, register 10, trigger -1 I , converter 12 codes, third, fourth, and fifth elements AND 13-15, second counter 16, element 1-ШИ 17, amplifier 18 signals of a dazzle, deflection coils 1 9 and 20, bus 21 for inputting information bus 22 of a pulse the beginning of the display, the bus 23 codes of the projections of vectors on the coordinate axes, the bus 24 signs of groups of vectors, the bus 25 codes increment The X coordinate and the Y coordinate coordinate bus 26. The code converter 12 (FIG. 2) contains the code comparison node 27, the switch 28, the decoder 29, the code shifters 30 and 31, and the high resolution code bus 32 of the larger vector projection. Comparison node 27 is designed to generate signals dX 2 uY or D Y D X, g; - e and X and Y, respectively, vector projection codes on the X and Y coordinate axes. Switch 28 is designed to select the higher bits from one of the two projections the vectors dX and d Y, according to the signal of the comparison node 27, are implemented on the standard elements 2I-OR-NOT. It is known that when CRTs are displayed on the screen of a CRT at the same time, the lengths of which differ from each other by less than 2 times, the differences in the displayed vectors in brightness are not perceived by the eyes. This property is used in this device. All possible values of the component vectors are divided into a number of groups, in each of which the vectors differ in length from each other by less than 2 times. The decoder 29 (fig.Z) forms eight signs of groups. The first group includes vectors of the smallest length. Let, for example, the entire projection of the vector onto the coordinate axis be represented by ten bits. The signs of the groups are determined by seven stages of discharge. In the absence of I, in the seven leading bits, the vectors belong to the first 774 group. If there is 1 only in the youngest of the seven most significant bits, the vectors belong to the second group and t, e. The decoder 29 implements the following functions, „b d e G g; b c d e f g; d e f; F g b with d e; f b with d; F all c; F a b; Fg a, where a, b, c, d, e, a, g are respectively the first, second, etc. bits of a larger component of the vector; a, b, c, d, e, f, g are their inverse values (the first rank is highest). The decoder 29 (fig.Z) contains inverters 33 - 47 and elements AND NOT 48-55. The shifters 30 and 31 of the codes are designed to divide the codes of the components of the vector by a certain number n (which can be equal to 1, 2, 4, 8, 16, etc.) by shifting the codes towards the younger ones by 0, 1, 2, 3 ... discharge The advantage of such shifters compared to shift registers is to perform a shift operation per clock cycle. FIG. 4 shows, as an example, a part of the shifter circuit 30 (31), which contains a group of elements And 56 for shifting codes by five bits, a group of elements And 57 for shifting codes by six bits, and a group of elements And 58 for shifting codes by seven bits The outputs of the And elements are respectively associated with the inputs of the group of elements OR 59. The remaining nodes that are part of the device (register, counters, adders, etc.) are no different from the known ones. The device works as follows. In the initial state, trigger 11, counters 6 and 16, and register 10 are set to O, generator 7 generates pulses, AND 8 is closed, bus 21 to register 10 is supplied with the projection codes of the vector x X and yY and line type indications (solid , dashed, dotted, dash-dotted). The sign bits of the DH HAY directly control the summers 4 and 5 — they determine the modes of their operation — addition or subtraction. 51 At node 27, D X i; Y and is produced, one of two signals i, X Y or. According to the result of the comparison, the switch 28 selects the higher-order code of the larger of the two projections and sends it to the input of the decoder 29. The decoder determines the coefficient n, which is output to the inputs of the shifters 30 and 31 and the counter 6. In the shift of the bodies 30 and 31, the division is performed codes yX and d Y by a factor p, the coordinate increment codes SX and 6 Y are set on their output buses 25 and 26. The coefficient p wrinkles in counter 6 (the signal from trigger II allows the input of the number n), i.e. the corresponding counting trigger is set to one. Next, the display start pulse, which enters the device input via bus 22, switches trigger 1 to one state and opens element 8. Generator 7 pulses pass through element 8 of inputs 8 of adders 4 and 5 as increment input 6 enable signals SY. Adders 4 and. 5 operate in addition or subtraction modes depending on the voltage levels in the sign bits of the register 10. The current values of the coordinate codes from the outputs of the adders 4 and 5 are fed to digital-to-analog converters 2 and 3, in which they are converted to analog form, amplified and are used in coils I9 and 20 to deflect the beam of the CRT 1. At the same time, the signal from the output of the three-way switch 11 allows the triggering of the elements 13-15. If register 10 holds the sign of a solid line, then element AND 13 is opened for the duration of the vector display. The signal from its output passes through the OR element 17, increases in amplitude in amplifier 18, and is fed to a CRT modulator to pick up the beam. If the register contains the sign of a dashed line, the element 14 periodically opens from the signals from element IB and the signals at its output are present only during the action of the pulses of the element 8, thereby the vector is displayed as a sequence of points. 76 On the basis of the dashed line, an element 15 must be opened, the third input of which is connected to the high-output output of counter 16, which is used as a frequency divider. Counter 16 may consist of two three bits. At the output of the higher bit, the pulses of the element And 8 form pulses of a lower frequency. They periodically unlock AND 15, as a result, an intermittent backlight signal is applied to the CRT modulator, the vector is displayed as a sequence of strokes. ) To display the dash-dotted line, it is enough to enter two signs into the IO register at the same time — dashed lines and dashed lines, in this case, the strokes are displayed by opening the element 15 and the points between the strokes by opening the element 14. At the same time, the pulses from the output element and 8 come on. the input of counter 6, the operation of the ground in the subtraction mode and taking into account the number of increments about X and entered into the adders 4 and 5; When issuing the last pair of increments Sx and SY: the counter 6 sets the code 0 ... 0. This code triggers element AND 9 (there are single states on all inverted outputs of counter 6 bits) and switches trigger 11 and register 10 to the initial zero state. The output signal from element AND 9 can be used as a signal for the end of the vector display. In the proposed device, any degree of accuracy of the display of vectors is achieved, since in it the given projections are first divided by the number n to obtain the increments S X and S Y, then these increments n times are output to the screen, i.e. multiplied n times. Vectors of the same projection of which differ from each other by an amount determined by the code of the least significant bits are displayed with the same number of increments, i.e. have unequal length, but are crossed out at the same time, practically do not differ in brightness. The application of the proposed invention in comparison with the known provides an increase in ergonomics

devices. Due to the fact that the graphic information in the proposed device can be displayed by four types of lines - solid, dotted, dashed and dashed-dotted, the observer can quickly perceive

the displayed situation, grasp it in one look at the house. This allows the observer to make the right decisions in a timely manner, minimizing the possibility of errors.

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Claims (1)

DEVICE FOR DISPLAYING GRAPHIC INFORMATION ON THE ELECTRON BEAM TUBE (CRT) SCREEN, containing a register, the first output of which is connected to the input of the code converter, the first and second outputs of which are connected respectively to the first inputs of the adders along the X and Y coordinates, and the third output is connected to the first the input of the first counter, the second input of which is connected to the first output of the trigger, the third input with the output of the first element And and the second inputs of the adders along the coordinates Xi Y, and the outputs of the first counter are connected to the inputs. second element And, whose output is connected to the input of the register and the first input of the trigger, the second input of which is the first input of the device, and the second output of the trigger is connected to the first input of the first element And, the second input of which is connected to the pulse generator, the second and third outputs of the register are connected respectively with the third inputs of the adders along the coordinates X th Y, the outputs of which are connected via digital-to-analog converters to the CRT deflecting systems, and a backlight signal amplifier connected to the CRT modulator, characterized in that, with In order to increase the accuracy of the display, it contains an OR element, a second counter, third, fourth and fifth AND elements, the first inputs of which are connected respectively to the fourth, fifth and sixth outputs of the register, the second inputs are connected to the second output of the trigger, and the outputs through the OR element are connected to the input of the amplifier of the backlight signals, the third input of the fourth element And is connected to the output of the first element And and the first input of the second counter, the second input of which is connected to the first output of the trigger, and the output to the third input of the fifth element I.