SU702394A2 - Device for forming characters on the screen of a cathode-ray tube - Google Patents

Description

(54) DEVICE FOR FORMING SIGNS ON SCREEN OF ELECTRON-BEAM PIPE

I

The invention relates to the field of computer technology, intended for use by display devices operating according to the method of a formed constant television, interlaced and small format raster,

The device according to the main author. St. Ne 572820 contains a character code decoder and a sequential / interconnected row code diverter, a delay unit switchboard, an intelligent signal distributor, a backlight pulse generator, a backlight pulse selector, a second input connected to the line code decoder output, and a third one to the character code decoder output.

However, such a device ensures the formation of only oblique signs across the entire screen field.

The device does not allow simultaneous formation of straight and oblique. font characters, i.e. tilt individual characters or individual

data arrays of information displayed on the screen.

The aim of the invention is to expand the field of application of the device due to the simultaneous formation of direct and oblique font characters.

The goal is achieved by the fact that a serially connected frequency generator, a symbol tilt impulse generator, an AND block, an OR element, the second input of which is connected to the delay unit, and an output to the distributor of impulse signals, the second output of the AND element block are connected to the device. the second input of the switch.

The drawing shows a block diagram of the device.

The device contains a frequency generator 1, characters tilt pulse generator (trigger) 2, block 3 elements AND (two elements), element 4 OR, switch 5, block b delay, distributor 7 pulse signals, generator 8 light pulses, sector 9 impulses Pys Podsvet, deciphering 1 character code and the decoder 11 code line. The device works as follows. A frequency generator 1 operating in the self-oscillating mode forms a meNLO frequency, for example, 1-5 Hz, of actions for the control input of the former 2 in the interval of co-coupling of the positive meander with signals of the beginning and end of the inclination, nocTyiiaio by the input t2 from the external device together the sign code at input 13 to the decoder 10, the code line at input 14 to the decoder 11 and the start signal at input 15 to block 3. of elements AND, When the input of the block 3 elements are affected AND the command to tilt the characters from the driver 2, the strobe signal starts Single unit 3 from the output of the AND post paet input switch 5, it is controlled by signals from decoder GB AND, and which minimizes the passage of feature deshifriruemoy delay line input unit 6. In block 6, the delay 6 in accordance with the number of the line to be decoded introduces a delay in the appearance at the input of a signal coming further through the OR element to the trigger input of the distributor 7 pulsed signals. The value of the delay introduced by the delay unit 6, with an increase in the number of the character string to be decoded, decreases, rushing to a null when forming the last character line of the character. The maximum delay occurs on the first line of the sign being formed and depends on the angle of inclination. Thus, the delay unit ensures the delay of the start of the distributor 7, necessary for the formation of oblique signs, If the input 12 together with the start signal does not receive a signal when the start of the slope or at the time of the signal of the sign of the slope from the frequency generator I receives a negative square wave , shaper 2 does not form commands for tilting the characters, and the start signal from the output of block 3 of the elements is AND goes directly through the element OR 4 to the input of the distributor 7 of pulse signals and starting it through mc without insertion delay. At start-up, the distributor 7 of pulsed signals generates a stack of pulse-shifted signals,

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Claims (1)

.) the distributers of h.h. generator 8 input from Jii.ixoaa, where from the incoming set of successively distributed pulse signals are carried out on the OR elements, in a sequential form, form the code combinations of the characters for the highlighting of character strings. The number of OR elements corresponds to the set of necessary types of code combinations from pulses of lodsvet of character strings determined by the graphical drawing on the rectangular grid of an alphabet character formed from the generator. From the generator output 8, the code combinations go to the selector 9 of the backlight pulses, to the control inputs of which the outputs of the decoders 10, 11 signals are received line number and generated) character. At the same time, the combination of the pulses to illuminate the character string, which corresponds to the generated string of the selected character, passes to the output of selector 9. The sequential synthesis of these video lights provides, at the output 16 of the device, the formation of a video light signal. Moreover, signs that are not marked with a sign of inclination are formed in the right font, while signs or a group of signs marked with a sign of inclination are formed during the period of the generation of a positive neural font generator with an inclined font, and with a negative meander - in the right font. The slope of these signs dynamically changes with the frequency of the meander being formed. The implementation of the coding of the generated features by the dynamic slope provided an expansion of the field of application of the device. The invention The device for forming characters on the screen of the cathode ray tube according to ed. To 572820, because of the fact that, in order to expand the field of application of the device due to the simultaneous formation of direct and inclined font characters, the sequentially connected frequency generator, the HK i pulses of the characters WLT, block of ephements .I, the element OR, the second input of which is connected to the delay unit, and the output - to the distributor of pulse signals, the second output of the block of elements AND connected to the second input of the switch. . h, -,