SU1223277A1 - Device for displaying information on screen of cathode-ray tube (crt) - Google Patents

Abstract

The invention relates to automation and computer technology and is intended for prompt output to the screen of a cathode ray tube (CRT) of graphic information coming from a computer. The aim of the invention is to increase the speed - achieved by introducing into each channel the deflection of the beam along the X and Y coordinates of the reference voltage source, switches, integrator and functional connections, which allow the display of the optimal number of elements of the piecewise linear approximation of the sign. Under the influence of the control signal generated in the control unit at the first control output, the register is reset to zero, and the second output is sent to the register coefficient codes in the basis of functions formed by integrating the Walsh functions. Here, the piecewise linear interpolation of the signal x (t) is carried out on a system of equally spaced nodes. The switches change the polarity of the constant voltage supplied to the inputs of the dividers from the outputs of the voltage source in accordance with the Walsh function value codes. The voltage x (t) is supplied to the horizontal or vertical plates of the deflecting system of the CRT, after one period of the Walsh functions is over, the signal is received from the generator to the control unit and informing it of the end of the process of displaying this symbol. 1 il. V)

Description

The invention relates to automation and computer technology and is intended for prompt display on a CRT screen of graphical information coming from a computer.

The aim of the invention is to improve the speed by providing the display of the optimal number of elements of the piecewise linear approximation of the sign.

The drawing shows a block diagram of the proposed device.

The device contains beam deflection channels along the X and Y coordinates, each of which contains control block 1, register 2 generator Walsh functions 3, source 4 of the reference voltage, switches 5i-5n, controllable dividers 6i-6k and integrator 7, output which is connected to the deflecting system of a CRT 8.

The device works as follows.

Under the influence of a control signal generated in control unit 1 and fed at the first control output, register 2 is reset to zero. Then, under the influence of the control signal, the second output of the control unit 1 is sent to the register from the control unit 1 codes of stored coefficients in the basis of {mal (j, t)) functions, formed by integrating the structure of the structure {wal (j, t)} ;

mal (j, t) 5 wal (j, t) dT;

(one)

x (t) Coo + Sff-c / mal (j, t), where the coefficients {C /} can be found by given values of x {t;) on O, C (cj; D (S; x (t ,) - -x (t, i)} ii;

W W; W is the Walsh matrix.

In this case, a piecewise linear interpolation of the signal h (t) is performed on the system of equal nodes ti i T / N; i О, 1, ..., N. At the same time on the control signal on the second output of the control unit, the generator 3 of the Walsh function is started. The outputs of register 2 are divided into groups, each of which corresponds to a code of one value C ;.

These codes control the resistance of the corresponding divider 6, to the control input of which the corresponding output of the register is connected.

The switches 5 change the polarity of the constant reference voltage supplied to the inputs of dividers 6 from one of the two outputs of the source 4 of the reference voltage in accordance with the codes of the values of the Walsch functions wal (j, t), therefore the inputs of dividers b are supplied corresponding to the Walsh functions (modulated by them). The inputs of the integrator 7 receive voltages corresponding to the values of the terms in the decomposition (1), because of. Q

 wal (j, t); j Oh, 1 N-1. therefore

At the output of the integrator 7, a voltage U (t) is obtained equal to

I-1

U (t) S | C; wal (j, T) dT + Uo (t)

 Coo + | Q5wal (j, T) dT x (t).

The voltage Uo (t) corresponding to the coefficient Co is set as the initial value on the integrator. This voltage x (t) is supplied to the horizontal or vertical plates of the deflecting system of the CRT 8.

At the end of one period of the Walsh functions, the signal from the generator 3 output is removed, which is fed to the input of control unit 1 and informs it of the end of the process of displaying this symbol.

Claims (1)

Invention Formula A device for displaying information on the screen of a cathode-ray tube (CRT), containing two channels of beam deflection along X and Y coordinates, each of which contains a Walsh function generator, a control unit, a register and controlled voltage dividers, the first output of the Walsh function generator to the input of the control unit, the outputs of which are connected to the corresponding inputs of the register, the outputs of which are connected to the control inputs of the corresponding controlled voltage dividers, the first output of the control unit is connected to the input Generator of the Walsh function, characterized in that, in order to increase speed by providing the display of the optimal number of pieces of a piecewise linear approximation of the sign, each beam deflection channel along the X and Y coordinates contains a reference voltage source, switches and an integrator, one of the switch inputs are connected to the source of the reference voltage, their other inputs are connected to the corresponding outputs of the generator of the Walshage function, the outputs of the switches are connected to the information inputs of the corresponding controls Voltage dividers whose outputs are connected to the inputs of the integrator, the output of which is connected to the deflection system of a CRT. Channel / G Channel U