SU551672A1 - Device for forming figures of conic section on cathode ray tube screen - Google Patents

Description

(54) DEVICE FOR FORMING CONFECTIONAL FIGURES ON THE SCREEN OF ELECTRON-BEAM PIPE

second quad. At the output of the first comparison circuit, a circle image signal is generated. In the second comparison scheme, the code of the sum of parabolic dependencies is compared with the sum of the code of the square of the radius and the code of the sum of two linear dependences that populate with the frequencies of the drinkers and the lines. At the output of the second comparing circuit, an image signal of a figure with a conic section is formed. The size of the circle of the conic section is determined by the code value of the square of the radius, and the shape and angle of inclination is determined by the sum of two linear dependencies of the field and line frequencies. The disadvantage of this device is

the presence of several complex blocks, namely, quadrants, which form parabolic dependences, similar to those at the output of a digital quad function generator.

The purpose of the invention is to simplify the device by eliminating complex blocks, namely quadrs.

This is achieved by the fact that the first and second combinational blocks and a memory register, the outputs of which are connected to one of the inputs

;) Comparison and adder circuits compare the Djinuievi functions, the outputs of the second accumulator of the accumulator type and the third-party digital counter are connected via a connection of the first first control unit of the quadratic function to the inputs of the second square comb. logical block whose r-days pe outputs of which are connected to the inputs of a third accumulator of the accumulator type, the other with inputs of the memory register, and the control inputs of the first and second combination logic blocks are connected to I give ust1eoystva synchronization.

The drawing shows an electrical block diagram of a device for forming a conic section figle on the screen of a cathode ray tube.

A device for forming figures of conic section on the screen of a cathode-ray tube contains a horizontal sampling generator 1, accumulator adder 2, pulse generator 3, reversible counters 4, 5 and 6, accumulator adder 7, combinational logic block 8, accumulator adder 9 , circuits 10 and 11 comparison, digital shaper 12 quadratic function, adder 13 comparing function, combinational logic block 14, reversible

counters 15 and 16, 17 pulse generator, memory register 18, switches 19-23.

The device works as follows.

From generator 3 to reversible meters

6.5 and 4 through the switches 19, 20, 21 the codes of numbers corresponding to the size of the displayed figure, and negative numbers corresponding to the shift of the figure up-down, to the right - to the left are brought down. From the output of the reversible counter 6, the code for the size of the figure goes to the combinational logic unit 8, From the output of the reversible counter 5, the code for the vertical movement of the figure goes to the adder

7, where the addition of this code with a code varying linearly with the frequency of horizontal sync pulses occurs. A similar operation is performed with the horizontal movement code of the figure in the adder 2, but in this adder the movement code is added to the code whose value changes linearly with the frequency of the horizontal sampling pulses generated by the generator of line synchronization pulses. Codes of the outputs of adders 7 and 2 are fed to the combinational logic block 8. Damping frequency pulses of the fields and lines arrive at the same block. An extinguishing impulse field arrives at the logical elements H of the combinational logic block 8, which are connected to the outputs of the reversible counter 6, and the figure size code passes through these elements and enters

Claims (2)

to digital driver 12, where it is squared. From the output of block 12, the code of the square of the size of the figure enters the combinational logic unit 14, to which the direct and inverse quenching pulses of the fields arrive. Upon the arrival of a direct extinguishing pulse, the code of the square of the size of the figure enters the register 13, where it is remembered for the time of one field. The rows are enriched by pulses on the logical elements AND of the combinational logic block 8, which are connected to the inputs of the adder 7, while the code from the output of this adder passes to the digital driver 12. where it is squared and fed to the inputs of the combinational block 14, which the inverse sequence of damping pulses passes it to the adder 9. The inverse sequence of row-fading pulses goes to those elements AND of the combinational logic block 8, which are connected to the outputs of the totalizer 2, while the code from the output of the adder 2 passes to the digital driver 12, where it squares with, and enters the input of the combinational logic unit 14, which under the action of the inverse sequence of field frequency pulses passes it to the adder 9. The code at the output of the adder 9 corresponds to the sum of the amplitudes of parabolic fields and lines. This code is fed to circuits 10 and 11. In turn, the code for squaring the size of a figure from register 18 is fed to adder 13 and circuit 10, where it is compared with the code that is located at the output of adder 9. At the output of circuit 10 a circle signal is generated F,. The signal of the conic section F- is synthesized using circuit 11. It is supplied with a code varying linearly with the frequency of lines and fields, which is generated by generator 17 and reversible counters 15 and 16. At the same time, the size of the formed figure depends on the code in register 18 and the angle of the figure is determined by the frequency of the generator 17 and the counting direction of the reversible counters 15 and 16. The elimination of complex quad circuits and the introduction of simpler combinational logic blocks 8, 14 and register 18 lead to a simplification of the device and a reduction in th elements. The invention The device for forming figures of conic section on a screen of a cathode ray tube, containing pulse generators, the first of which is connected via switches to the inputs of three reversible counters, the first and second of which are connected respectively to the first and second accumulators of the accumulating type, the synchronization inputs of which are connected to control input and output of the horizontal sampling generator, the third accumulator of accumulation type, the outputs of which are connected to the inputs of the first and second Comparison circuits, OTHER inputs of the first comparison circuit are connected via an adder comparing function with the fourth and fifth reversible counters connected in series, connected respectively to the output and the control input of the second pulse generator to a digital quadratic fuscion generator, characterized in that, in order to simplify the device, The first and second combinational logic blocks and a memory register are entered in it, the outputs of which are connected to one of the inputs of the second comparison circuit and the adder the functions, the outputs of the first and second accumulators of the accumulated state and the third reversible counter are connected via serially connected iieiJBbiii a combination logic unit and a digital generator of a quadratic function to the inputs of the second combination logic unit, one input of which is connected to the inputs of the third accumulator of the accumulating type, the others with inputs the memory register, and the control inputs of the first and second combinational logic blocks are connected to the synchronization inputs of the device. Sources of information taken into account during the examination: 1. Konov K. I. Synthesis of figures of a conical glow on a television raster. Works of educational institutes of communication. L., 1971., vol. 55, p. 221-224, fig. 2 2. USSR Author's Certificate No. 438136, M.C. H O4N 5/22, 1974 prototype).