SU1645991A1 - Device to read data on crt display - Google Patents

Abstract

The invention relates to computing and may not be used in display systems. The purpose of the invention is to expand the field of application of the device by displaying color symbols - by introducing switches 15 and 17, connecting the output of the video signal generator 6 to the input of the switch 15, the outputs of which are connected to the inputs of the register 16 and the switch 17, the other input of which is connected to the output 1 Register 16, and the output with input of a digital-to-analog converter 1 &. 1 il.

Description

The invention relates to computer technology and can be used in information display systems.

The purpose of the invention is the expansion of the scope of the device due to the ability to display colored symbols o

The drawing shows a functional diagram of the proposed device.

The device comprises a data input unit 1, a first switch 2 (records), a memory unit 3, a second switch 4 (reads), a 5-character generator, a video shaper 6, an adder 7, a television indicator 8, a clock generator 9, a decomposition element generator 10, a counter 11 decomposition elements, a counter of 12 characters per line, a counter of 13 television lines, a counter of 14 lines of text, a third switch 15 (circuit), a 16 color register, a fourth switch 17 (color), a digital-to-analog converter (DAC) 18, and a frequency modulator 19.

All units of a device for displaying information on a television indicator are standard units used in computer technology and information display devices.

The data input unit 1 comprises an input keyboard and a computer interface unit (not shown).

Record switch 2 contains gated address and data registers.

The memory unit 3 is a storage device for storing parallel digital binary codes.

The read switch 4 is a gated data register.

A symbol generator 5 is implemented as a storage device for storing parallel digital binary character shape codes.

Shaper 6 video signal contains a sequentially shifting data register.

The adder 7 is implemented as an analog summing device.

The television indicator 8 is a standard television color video monitoring device operating on the CEKAM system.

The sync generator 9 is a standard television unit for generating pulses of synchronization of television scans.

The decomposition element generator 10 is implemented as a standard clock pulse generator.

Counters 11-14 are standard binary pulse counters.

Register 16 colors made in the form of a parallel register for storing information.

Switches 15 and 17 are standard switches for two digital signals.

The digital-to-analog converter 18 is implemented as a standard device for converting codes to voltage.

The frequency modulator 19 comprises a modulation unit and a color video signal generating unit in accordance with the standard of the SECAM system.

Ustron = o works as follows.

In the recording mode, graphic information is input into the memory unit 3 from the data input unit 1 either from the computer or using the keyboard. At the same time, the address code corresponding to the address on the television screen of the recorded symbol and the digital code of the elementary input character. The entered digital code carries information about the elements of the image contour, the color background and the sign of the contour.

Switch 2 transmits the encoded signal of the input symbol and the address signal to the first input of memory block 3 only during the reverse, horizontal and vertical sweeps, for which clock pulses from the second output of the clock generator 9 are fed to the second input of switch 2. The memory block 3 records digital graphics information at the address indicated by the address code.

In the mode of reading information on a television screen, the device operates under the control of a counter 11 of decomposition elements, a counter of 12 characters per line, a counter of 13 television lines and a counter 14

lines of text connected in series, as well as the clock generator 9, The pulses from the output of the clock generator 9 are supplied to the decomposition element generator 10, triggering it during the forward sweep. That very thing. the image elements are rigidly linked to the beginning of the television frame and line. The generator 10 elements of decomposition produces pulses with a frequency exceeding the repetition rate of the elements of decomposition of the image. These pulses are fed to the input of series-connected counters 11-14, operating in counting mode. The current values of digital codes from the second output of the counter 12 characters per line and the output of the counter 14 lines of text are fed to the second and third address inputs of the memory unit 3. These codes determine the current address of the memory cell from which information is being read at a given moment in time.

During the direct course of television scans, the luminance (black-and-white) information of the block's memory cell through the switch 4 by the signal arriving at the second input of the switch from the third output of the sync generator 9 is fed to a 5-character generator. Generator 5 decomposes the digital code corresponding to the luminous component of the symbol into television lines (generating circuit symbols) using a signal supplied to its second input from the counter 13 of television lines. A parallel digital binary code from the output of the generator 5 is supplied to the video signal shaper 6, where, using the signals coming from the second output of the counter 11 of the decomposition elements, a sequential temporary code scan takes place.

The video signal thus formed carries luminance, black and white information about the contours of the image. Color information is generated in the color channel, which contains the switch 15 connected in series, the color register 16, the switch 17, the digital-to-analog converter 18, and the frequency modulator 19. From the memory block .3, the control information (1 bit) from the third the output of the switch 4 to the second input of the switch 15, and the color information in this familiarity coming to the input of the register and switch 17. Depending on the value of the control discharge in this familiarity Either a transition by a contour signal to another color or display of a colored symbol (the color is determined by the color code in this familiarity) without changing the current color, i.e. the control bit makes it possible to interpret the contour signal in this familiarity either as a colored symbol (there is no reference to the symbol contour), or as a contour to which color is assigned.

In the contour display mode with 20 snapping, the color channel works as follows.

The control code coming from the third output of the switch 4 switches the switch 15 in such a way 25 that the loop signal coming to its first input from the output of the video signal shaper 6 passes to the input of the color register 16. Color information coming from the second output of switch 4 is recorded in register 16 by the loop signal arriving at its sync input sync. The switch 17 thus passes the color code from the output of the register 16 to the input of the DAC 18.

In the color symbol display mode, the switch 15 is switched so that the loop signal passes to the second output of the switch ₄ 0 RA 15 and then to the second input of the switch 17, while the switch 17 at the time points corresponding to the display of the symbol points switches from the first input to the third , i.e.

first, the color code from register 16 comes to the display, then, when the color symbol is displayed, the switch passes the color code written in this familiarity, coming from the second output to e <utilization 4, writes new color information to register 16 in this the mode does not occur, therefore, when the output of the symbol points ends, the switch 17 reconnects the output of the register 16 to the input of the DAC 18 and the color that was displayed before the arrival of the symbol points is displayed. Thus, it provides— ^{: the} ability to display colored symbols (with arbitrary outlines) is printed. Information from the output of the switch 17 in the form of a parallel binary code is fed to the input of the DAC 18, where it is converted into a luminous signal Uy and interlaced into two color-difference signals U _R .y and Ur-щ in accordance with the SECAM standard. To do this, at the second input of the DAC 18 from the fourth output of the sync generator 9, horizontal and frame synchronization signals are supplied. During the reverse motion through the frame in the DAC 18, color synchronization pulses are generated and mixed into the video signal. From the first output of the DAC 18, the color difference signals Ur. y and U _R _ _a arrive at the frequency modulator 19, in which the modulation of the frequency \ signals at two subcarrier frequencies is carried out. A color video signal is generated at the output of the frequency modulator 19, and a brightness video signal is generated in the second PAP 18 output in accordance with the standard of the SECAM system. The color video signal from the output of the frequency modulator 19 is supplied to the first input of adder 7, the brightness video signal of the image from the DAC 18 is supplied to its second input, and synchronization pulses ₍ from the fifth output of the clock generator 9 are received at its third input). A full television video signal is generated in adder 7, which is fed to the television indicator 8, where the graphic image is reproduced.

Using the proposed device to display information on a television indicator in comparison with the known allows to expand the scope of their application due to the ability to display colored characters.

Claims (1)

Claim A device for displaying information on a television indicator screen, comprising a data input unit, the input of which is the information input of the device, and the output is connected to the information input of the first switch, the output of which is connected to the information input of the memory unit, the output of which is connected to the information input of the second switch, the first output which is connected to the first address input of the sim NEP generator, the output of which is connected to the information input of the video shaper, the clock generator, the first the output of which is connected to the input of the decomposition element generator, the second output is with the control input of the first switch, the third output is with the control input of the second switch, the fourth output is with the clock input of the digital-to-analog converter, and the fifth output is with the control input of the adder, the output of which is connected to the input of the television indicator, generator output element ;; the decomposition is connected to the input of the counter of decomposition elements, the first output of which is connected to the input of the character counter in the line, the first output of which is connected to the input of the counter of television lines. the first output of which is connected to the input of the text line counter, the second outputs of the decomposition element counter, the character counter in the line, and the television line counter are connected respectively to the control input of the signal generator, the first address input of the memory unit and the second address input of the character generator, the output of the text line counter is connected to the second address input of the memory unit, the first digital output: the alogue converter is connected to the input of the frequency modulator, the output of which is connected to the first information th input of the adder, the second An information input coupled to a second output of the digital to analog converter, a second output of the second switch is connected to the control input of the register, characterized in that, in order to expand the application area of the device due to the possibility otob-. color symbols, the device contains the third and fourth switches, the output of the video driver is connected to the information input of the third switch, the control input of which is connected to the third output of the second switch, the first output of the third switch is connected to the information input of the register, the output of which is connected to the first information input of the fourth switch , the second information input of which is connected to the second output of the second switch, 9 1645991 10 equalizing input - to the second output of the information input of the digital-analog of the third switch, and the output - to the th converter.