SU1016816A2 - Device for forming vector signals on cathode-ray tube screen - Google Patents

Abstract

1. DEVICE FOR THE FORMATION OF A VECTOR ON THE SCREEN ELECTRON BUT BETTER TUBE ON AUT. St. IP 798964, characterized in that, in order to increase the accuracy of vector formation, it contains the first and second comparison circuits, a key, a trigger and a functional converter, the inputs of which are connected to the corresponding inputs of the device, and the first and second outputs are connected to the corresponding inputs of the differential amplifiers channel X and Y and with the inputs of the first circuit, the output of which is connected to the input of the reference pulse generator and one of the key inputs, the output of the latter is connected to one of the inputs of the second comparison circuit, ugoy input connected to the third output of the function generator, a fourth output is connected to one of the trigger inputs, the other input of the flip-flop and its output and a second comparing circuit connected to a respective output and the respective inputs of: the control unit. 2. The device according to claim 1, characterized in that the functional converter contains an element, a third and a fourth comparison circuit, a fifth and sixth digital-analog converters, calculators on X and Y coordinates, a sawtooth generator, a memory element and an element OR, one of the inputs of which and the inputs of the adders. In the X and Y coordinates are the corresponding inputs of the functional converter, the first and second outputs of which are respectively the outputs of the fifth and sixth digital-analogue converters and-one and From the inputs of the third and fourth comparison circuits, the outputs of which are connected to the inputs of the element and whose output is the fourth output of the function converter and connected to one of the outputs of the sawtooth generator and the input of the memory element, the output of the latter is connected to the other output of the OR element, the output which connection is connected to another input of the sawmill voltage generator 3, the output of which 00 is connected to the other inputs of the third and fourth comparison circuits and is the third output Atel, the outputs of the sum-, tori on the coordinates X and Y are connected to the inputs of the fifth and sixth digital channels, hv converters, respectively.

Description

The invention relates to automation and computing and can be used in devices for reading and displaying graphical information. According to the main author. St. No. 798964, a device for generating scanning signals, comprising, for each control channel, serially connected registers and digital-to-analog converters, the outputs of which are connected to one input of a differential amplifier, the output of the differential amplifier of each channel is connected to an electron-beam tube deflection system, the output of which is connected to the registers, the modulator of the cathode ray tube and the generator of the reference pulses connected to the digital-to-analog converters, di The differential circuit in each control channel, one output of which is connected to the outputs of digital-analog converters, and the other to the second input of the differential amplifier. The prior art device is characterized by the relative simplicity of generating the sweep signals. However, a noticeable improvement in the quality of the conversion has not been achieved here, since it is not accepted to eliminate the dynamic error arising in the path of the differential amplifier — a deflecting system and leading to a decrease in the accuracy of operation of the entire device. In addition, even in the presence of a wideband differential amplifier, there remains the problem of connecting the vectors at the break points of graphic lines, which is especially important when using these devices in precision transducers of measuring and computing equipment. The purpose of the invention is to improve the accuracy of the formation of the sweep signals. This goal is achieved by a J4TO device for forming a vector torus on the screen of a cathode ray tube contains the first and second comparison circuits, a key, a trigger and a functional transducer, whose inputs are connected to the corresponding 1CMI device inputs and the first one. and the second outputs are connected to the corresponding inputs of X and Y differential amplifiers and to the inputs of the first comparison circuit, the output of which is connected to the input of the reference pulse generator and one of the key inputs, the output of which is connected to one of the inputs of the second circuit, compared to another input which is connected to the third output of the functional converter, the fourth output of which is connected to one of the trigger inputs, the other trigger input and its output and the output of the second comparator circuit, are connected to the corresponding output and corresponding yuschimi inputs of the control unit. The functional converter contains an And, third and fourth comparison circuit, fifth and sixth digital-to-analog converters, X and Y adders, a sawtooth generator, a memory element and an OR element, one of the inputs of which and X and Y coders inputs are the corresponding inputs of the functional converter, the first and second outputs of which are respectively the outputs of the fifth and sixth digital-analog converters and one of the inputs of the third and fourth comparison circuits, the output Which are connected to the inputs of an element, the output of which is the fourth output of the function converter and connected to one of the inputs of the sawtooth generator and the input of a memory element, the output of the latter is connected to another input of the OR element, the output of which is connected to another input of the sawtooth voltage, the output of which is connected to other inputs of the third and fourth comparison circuits and is the third output of the functional converter, the outputs of the adder are in coordinates X and Y are connected to the inputs The fifth and sixth digital-analog converters, respectively. FIG. 1 shows a functional diagram of the device; in fig. 2 is a functional diagram of the functional converter f in FIG. 3 - timing charts of signals, explaining the operation of the device. The device contains i-4 registers, two (1 and 2) of which relate to the X coordinates, and two others (3 and 4) to the Y coordinate, digital-to-analog converters 5-8, which also relate to the X and Y coordinates , generator 9 reference pulses, control unit 10, differential usi-. Lines 11 and 12, cathode ray tube 13 with deflecting system 14, differentiating circuits 15 and 16, functional transducer 17, first comparison circuit 18, trigger 19, key 20, and -BTopiJ comparison circuit 21. The structure of the functional Converter 17 includes adders 22 and. 23 by X and Y coordinates, sawtooth voltage generator 24, digital-to-analog converters 25 and 26 by X and Y coordinates, third and fourth comparison circuits 2.7 and 28, AND element 29, OR element 30, and memory element 31.

The first inputs of registers 1-4 are connected to the input buses, which receive the codes for the beginning and end of each conversion element on both control channels and the corresponding inputs of the functional converter 17. The second inputs of all registers 1-4 are interconnected and connected to one of the outputs. control unit 10, the outputs of registers 1-4 are connected to digital inputs of the corresponding DACs 5-8, the analog inputs of which are connected to the generator 9 of reference pulses, whose input is also connected to the output of control unit 10, another output to torogo CRT connected to the terminal 13. The outputs of DAC 5 u b are interconnected and connected to the first input of the differential amplifier 11, and DAC BHxojffii .7 and 8 SO.6OY also interconnected and connected to the first input of the amplifier 12,

The outputs of amplifiers 11 and 12 are connected to a diverting system 14, and between the first and second inputs of each amplifier 11 and 12 are connected differentiating circuits 15. and 16. The output of comparison circuit 21 is connected to the first input of control unit 10, and its inputs are connected to a key 20 and. An output of the functional converter 17, the other outputs of which are associated with the comparison circuit .18, the second input of each of the amplifiers 11 and 12 along the X and Y coordinates and the trigger 19, the second input of which is connected to the fourth output of the control unit 10, and the output 19 the trigger is connected to the second input of block 10 control and key 20, the first input associated with the comparison circuit 18 and the generator input 9 of the reference pulses, the third output of which is combined with the same name of the BGM input of the control unit 10 The output of the memory element 31 is connected to the Vlokhod element I 29 and the generator 24 input of the sawtooth voltage, another the input of which is connected to the elements OR 30. The output of the generator 24 is connected to the comparison circuits 27 and 28, other inputs connected to digital-to-analogue converters, lines 25 and 26 in the X and Y coordinates, whose inputs are connected to the adders 22 and 23, the first inputswhich are combined and connected to the second input of the OR element 30, which is connected to the input bus of the device, and the outputs of the comparison circuits 27 and 28 are connected to the input of the And element 29.

The device works as follows. .

When forming, the vector scan signal, for example, on the screen, CRT in registers 1-4 and at the inputs of adders 22 and 23 of the functional converter 17, coordinate codes X and Y nodes of the points of the graphic element (segment) are received. With the arrival of the control signal of FIG. 3, plot a), which determines the start of operation of the device, the generator 24 of the saw-tooth is launched through the element OR 30. The output signal of the generator 24 ((Fig. 3, the if / plot is fed to the first inputs of the comparison circuits 27 and 28, the BTOixae inputs of which receive the voltage of the digital-to-analogue converters 25 and 26 of the Fig. 3, the diagrams-d), associated with adders 22 and 23.

The outputs of digital analogue converters 25 and 26 form voltages proportional to the cut-off code in Koopjp HaTaM X and Y. These voltages are also fed to the inputs of amplifiers 11 and 12 along the coordinates

X and Y, the shift is the starting point by a certain amount, and the shift direction is the opposite of the direction of the front sweep. At the same time, the signals are removed from the outputs of the comparison circuits 27 and 28 (Fig. 3, plots, e), determining the time required for installing each of the amplifiers .11 and 12 to the converging point (the time required for the transition process to complete). off dow

system 14). As in the general case, the time required to install each of the amplifiers to the initial point may be different {it depends on the size of the commanding code

coordinates X and Y), for operation of the device, the longest time g determined by the element AND 29 (f. C, epyurae (C). The signal from the output of the element 29 and 29 is used to start the control trigger 19 and to reset

generator 24 (Fig. 3, epuretus). . At the same time, the voltages from the outputs ЩŠШ 25 and 26 are fed to the comparison circuit 18, at the output of which a voltage signal is formed that is equal in magnitude to the largest of the voltages (compared). This signal is fed to the input of the generator 9 reference pulses for the formation of the total reference level r required for

obtaining the reference linearly from the lazy signals determining the digital-to-analog converters 5 7.

The signal from the trigger output 19;

(Fig. 3, epira C,) at first

the KJBOHa 20 input and the first input of the control unit 10 and further to the inputs of registers 1-4 along the X and Y coordinates, providing simultaneous input of codes into all registers 1-4, since parallel multi-digit vector-end codes have a time shift relative to each other,. is one of the reasons for the appearance of interference (outliers) in the output signals

No. P 5-8. Simultaneously with the writing of codes into registers 1–4, generator 9 is started, the fourth and second linearly varying voltages. These voltages are supplied to the analog inputs of the digital gyroscope modules 5 and 7, the analog inputs of the digital digital indicators 6 and 8 receive the reference voltages of the generator 9 reference pulses. As a result, voltages are formed at the outputs of the D / A converter 6 and 8, corresponding to the coordinates of the beginning of the segment being formed, and at the outputs of the D / A converter 5 and 7 - its end. Thus, using the DAC 5-8, the projection code of the vector on the coordinate axes is converted into the amplitude of the alternating sawtooth voltage, i.e. the coordinate codes of the nodal points of the segment are multiplied by the reference voltages received from the generator 9 reference pulses, as a result of which, at the outputs of the D / A converter 5-8, sawtooth signals are obtained whose amplitudes correspond to the input code. A valuable property of such multipliers is the possibility of multiplying the numbers characters in one measure. The time of the operation does not depend on the number of bits of the factor. The multiplication accuracy is 0.07-0.1%, which exceeds the accuracy of analog multipliers. The signals from the outputs of the DAC 5 and 6 on the X coordinate are summed at the first input of the amplifier 11, and the signals from the outputs of the DAC 7 and 8 on the Y coordinate on the first input of the amplifier 12. The output signals from these amplifiers 11 and 12 (Fig. 3, plot) arrive to the deflection system 14. At the second input of the switch 20, an analog voltage is supplied from the comparison circuit 18. At the output of the switch 20, a voltage appears (Fig. 3, plot K) proportional to the largest of the input code values of the X and Y coordinates of the grid points at the moment corresponding to the start of operation of the main components of the device. This voltage is fed to the input of the comparison circuit 21, the second input of which receives a signal from the output of the generator 24, which was previously reset by a signal from the output of the AND 29 element and triggered by the same signal after some time, determined by the memory element 31 and the OR element 30 (Fig. 3, plot J-). At the output of the comparison circuit 21, a signal appears (Fig. 3, plot A), determining the beginning of the illumination of the vector being generated. This signal through the control unit 10 enters the output (control electrode), as a result of which a vector is observed on the screen of the CRT 13, the length of which is equal to the difference between the coordinate codes X and Y taken from the input buses of the device. When the generator 9 generates reference pulses of a linearly varying voltage (Fig. 3, plot / l) from its output, control unit 10 is given a signal that prohibits the illumination of the generated vector. A signal is removed from the output of the control unit 10 (Fig. 3, plot.), Resetting the control trigger 19 and terminating the scanning signal generation process. I The proposed device allows to completely eliminate the harmful influence of the source of error (inductance of the deflecting system) and to carry out linear and accurate transformation of the coordinate code along the X and Y components into the corresponding graphic image. And this means that while maintaining the same advantages, it is possible to reproduce in a single period a greater number of graphic elements with high image quality, i.e. increasing the resolution and, as a result, the information capacity of the display device for reading graphic information.

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Claims (2)

1. DEVICE FOR FORMING A VECTOR ON THE ELECTRON BEAM TUBE SCREEN by ed. St. # 798964, characterized in that, in order to increase the accuracy of forming a vector, it contains the first and second comparison circuits, a key, a trigger and a functional converter, the inputs of which are connected to the corresponding inputs of the device, and the first and second outputs are connected to the corresponding inputs of differential amplifiers by channel X and Y and with the inputs of the first comparison circuit, the output of which is connected to the input of the reference pulse generator and one of the key inputs, the output of the latter is connected to one of the inputs of the second comparison circuit, the other input d which is connected to the third output of the function converter, a fourth output is connected to one input of the trigger, the other input of the flip-flop and its second output circuit output the second congruence connected to a respective output and the respective inputs of the control unit. 2. The device according to π. 1, characterized in that the function the national converter contains the AND element, the third and fourth comparison circuits, the fifth and sixth digital-to-analog converters, adders along the X and Y coordinates, a sawtooth voltage generator, a memory element and the OR element, one of the inputs of which and the adders inputs along the 'X and Y coordinates are the corresponding inputs of the functional Converter, the first and second outputs of which are respectively the outputs of the fifth and sixth digital-to-analog converters and one of the inputs of the third and fourth comparison circuits, the outputs of the cat connected to the inputs of the AND element, the output g of which is the fourth output ® of the functional converter and connected to one of the outputs of the sawtooth voltage generators and the input of the memory element, the output of the latter is connected to the other output of the OR element, the output of which is connected to the other input of the sawtooth generator voltage, the output of which is connected to other inputs of the third and fourth comparison circuits and is the third output of the functional converter, the outputs of the sum-, tori along the X and Y coordinates are connected to the inputs fifth and sixth tsifroanalo govyh 'converters respectively 1016816 A