SU614450A1 - Arrangement for displaying information on crt screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION ON CRT SCREEN

This allows you to increase the speed of the device and expand its scope.

The drawing shows a block diagram of the proposed device. It contains the vector length code register 1, the vector length projection code register along the x 2 coordinate, the vector length projection code along the y coordinate 3, the highlight trigger 4, the code-time interval converter 5, the code-voltage converter along the X 6 coordinate, the converter code-voltage with respect to coordinate y 7, amplifier 8, element AND 9, element OR 10, amplifier illumination 11, amplifiers with coordinates X 12 and y 13, decoder 14, element OR 15, counter 16, regis 17, waiting for generator 18, Comparison unit 19 and integrators on coordinates X 20 and 21.

The device works as follows.

Under the influence of the control signal of the input element OR of the control unit 10c (not shown in the drawing), the register 1, 2 and 3 and the trigger of the backlight 4 are reset to zero. Then, under the influence of the control signal Uy2, which is generated in the same control unit, the code of the first segment of symbol 2 I is written into register 1, the code of its projection into register 2, its projection code {uL register 3, code of the number of strokes of the shadow symbol into register 17 and the sign of illumination {nd in trigger of illumination 4,

The contents of register 1 are converted in a code-time interval 5 to a pulse, the duration of which is proportional to the length of the first segment of the generator of the character.

The contents of registers 2 and 3 are converted into code-voltage converters 6 and 7 into signals X, whose values are respectively proportional to codes X and Yj.

The pulse from the output of the amplifier 8 on the falling edge of the signal of the converter 5 through the element OR 10 resets the registers 2 and 3 to zero. This achieves the formation of pulses taken from the outputs of the converters 6 and 7, but not the voltages. The duration of these pulses is proportional to the length of the first portion of the generator of the symbol E, and the amplitude is respectively proportional to the codes x and y |,

The pulse from the output of the amplifier 8 clears to zero also the register 1 and the flip-flop trigger 4. As a result, a rectangular pulse is removed from flip-flop 4, the duration of which is proportional to the length of the forming part of the symbol generator.

Before the formation of the symbol begins, the counter 16 is at zero.

as a result, the nullity of the decoder 14 is selected, and no signals are received to the inputs of the amplifier 11 and the amplifiers 12 and 13. The gain of the amplifiers is maximum.

The rectangular pulses from the output of the converter 6, through the amplifier 12, are fed to the input of the integrator 20. Under the influence of the input rectangular pulse, the integrator 20 generates a signal Vjjlt), which varies linearly.

Similarly, the output voltage 1 / y (i) is formed by the integrator 21.

The beam trail is illuminated by a pulse from the output of flip-flop 4. Element I 9, in this case, serves to correct the delay of the signal in amplifier 8, element 10 and trigger 4.

The pulse From the output of the amplifier 8 goes to the control unit, informing it that the playback of the first segment is over. The control device again generates a 1Gu2 signal, under the influence of which the turns are recorded in registers 1, 2 and 3, respectively. , X and the trigger 4 - a sign of illumination VZ-l

4- l. J

etc.

After the last segment has been mapped, a pulse W arrives at the counter 16 and the contents of this counter increase by one. Since the outputs of the counter 16 are closed to the inputs of the decoder 14, its first output bus is selected. The signal coming through this bus reduces the gain factor of amplifiers 11-13.

The signal W is also fed to the input of the waiting generator 18, which produces a rectangular impulse to the input of the integrator 20, which produces a voltage displacing the trace of the electron beam in the plane of the CRT screen by the thickness of the generator.

Under the influence of the control signal Uy, j, the registers 1-3 again write codes {Е4 tViJ f e into trigger 4 - a sign of illumination 3 tons, e. the code equivalent of the first section of the generator. However, due to the lower gain of the amplifiers 12 and 13, the length of the displayed section turns out to be less by the thickness of the generator of the symbol. Due to the fact that the amplitude of the pulses from the output of the amplifiers 12 and 13 decreases, the inclination of the sawtooth voltage 11 (1) and 1 Гу () also decreases. At the same time, the speed of movement of the electron beam trace along the Displayed segment decreases. This necessitates a reduction in the amplitude of the backlight pulse.