SU634320A1 - Device for shaping characters on crt screen - Google Patents

Description

BxcxiOM 1c-ng)) and the link, the input of the control unit is connected to the output of the memory unit, and the output is connected to the second inputs of the character generator, line generator, memory unit and switch, the output of which is connected to the decoder unit.

The introduction of new elements into the device allowed, simultaneously with the scanning of the radio, the simultaneous parallel formation of a video sub-light of signs and graphs on the signs of the ends of the lines, which does not require splitting the lines into segments, and it is enough to store only the codes of attributes and their addresses.

This made it possible to free up a large amount of data memory from the need to store segmental codes and ensured an increase in the device speed.

FIG. 1 shows a block diagram of the device, FIG. 2 shows an example of constructing a blank of a table formed on a display screen with a vertical raster.

The device contains control block 1, 6; ioK 2 memory, switch 3, buffer memory block 4, character generator 5, depyrrator block 6, register block 7 in - composition of register 8 signs of vertical lines and register 9 signs of horizontal lines, generator 10 lines the vertical light generator 11, the horizontal line illuminator 12 and the OR 13 elements, the output bus 14 of the control unit, the input bus 15 of the memory unit, the output bus 16 of the character generator, the output bus 17 of the line generator.

The device operates in the following way. Control unit 1 at output 14 generates control signals that synchronize the operation of incoming blocks and an external indicator so that the video information illumination on the indicator screen is performed synchronously with the raster scan. Formation of video sublights of sign information. For example, the form of the table of FIG. 2 is carried out in accordance with the program of codes received by the B memory block 2 at the input 15, where they are stored in order in the information bands and periodically polled with the frequency of the fields of the television indicator.

 When polling, the service word codes from the output of memory block 2, characterizing the type of data to be processed, are received in control block 1, and the codes of signs and signs of the ends of the lines with their address are sent to the input of the commutator 3 that distributes the control signal from the block 1 control information in the channel of sign and graphic conversion.

The channel of the sign conversion to the time intervals reserved for writing character codes (Fig. 2, a) ensures that the character codes of the buffer blocks are filled. and then, in time, corresponding to the display (Fig. 2.6), converts the binary codes of the characters into the video signals of the backlight of these characters. At the same time, the block 4 of the buffer memory during the scanning period of the television lines allocated for displaying the information strip is cycled once and the character codes pass from its output to the input of the character generator S, simultaneously to the control input of which comes from the block

control I line code and polling cycles. Under the influence of the established signals, the character generator 5 generates a video signal illuminating the signs at the output 16.

The graphic transformation channel is synchronized by the control unit 1 with the operation of the sign conversion channel, so that the illuminations of the vertical and horizontal lines generated by it correspond to strictly defined time intervals on the line and the raster decomposition frame, which made it possible to form lines in the intervals between the displayed characters. The codes of the signs of the ends of the lines and the addresses of their location during periods of time (Fig. 2, c), reserved for their recording, through the switch 3 come to the decoder block 6 to the corresponding decoders of the address code and the features code, from which the generated signals of the address sample are output. and the sign of the beginning (end) of vertical or horizontal LINES is received in block 7 registers on the input of registers 8 or 9.

If the sign characterizes the beginning or end of the vertical line, it is recorded in the memory cell of the register 8 signs of the vertical lines. If the sign characterizes the beginning of the horizontal line, then it is recorded in register 9. When the sign of the end of the horizontal line arrives, the selected address is erased from the register 9 cell of the previously recorded sign. In the register, 8 signs of vertical lines are rewritten in each cycle of the recording mode, while in register 9, information is rewritten once per field sweep (frame) period.

The shaper 12 highlights of the horizontal lines transforms the sign entering its input repeatedly into short illumination pulses in raster rows, the synthesis of which on the display screen with a vertical raster forms horizontal lines.

The shaper 11 of the highlights of the vertical lines, on the contrary, generates long illumination pulses along the raster line once per period of displaying the information strip (Fig. 2e). First arrived at

Claims (3)

the input of the illuminator 11, the sign of the beginning of the vertical line forms the leading edge of the illumination pulse, and the next incoming sign of the end of the vertical line forms the rear edge of the illumination pulse at the output of the imager 11. from the output of the formers 11 and 2, the illumination pulses arrive at the input of the element OR 13, from the output of which the mixed video sublights arrive at the output 17 of the video generation device. With the introduction of new elements - a block of decoders and a block of registers - it became possible to parallelly form video sublights of signs and graphics, which made it possible to display a larger amount of information data on the screen and ensured an increase in device performance. DETAILED DESCRIPTION OF THE INVENTION A device for generating marks on a screen of a cathode ray tube, containing an .ee generator: 1 blue, a control unit and a serially connected memory block. A switch, a block of memory and a character generator, characterized in that, as a result of improving the speed of the device, a block of decoders and a register register are entered into it, the input of which is connected to the output of the block of decoders, and the output is connected to the input of a line generator, the input of the control unit is connected to the output of the memory unit, and the output is connected to the input and the input of the memory unit, character generator, line generator and commutator, the output of which is connected to the decoder unit. Sources of information taken into account in the examination: 1. Patent CLLIA XA 3675232, 340-324 A. 1974. 2. The patent of Germany No. 2024634, G 06 K 15/20, 1972. 3. Thornhil, Chick. Graphic terminal with raster scan, characterized by increased flexibility and low cost. - Electronics, 1974, L 3, p. 25-33, fig. 6 fJodcSem Marks & IL1 77 PaasWegp Lini cmp aT J1 in-JT JlJljn-JLJl-ULJl-iJLJL  GLG11PG 1GTGT1G1G1GSh 1P1GTG one