SU1488873A1 - Device for displaying information on the screen of tv indicator - Google Patents

Description

The invention relates to computing and automation and can be used to display information from a computer. The purpose of the invention is to increase the reliability of the displayed information. The device contains a generator of 1 pulses, the first 2 and second 10 count2

tweaks, video signal generator 3, television indicator 4, quench pulse generator 5, multiplexer 6, register 7, memory block 8, synchronization block 9, switch 11, block 12 for entering the start address with corresponding connections. When displaying information, the first 2 and second 10 counters form a cyclical sequence of addresses of reading words of memory block 8. The sequence of displaying lines of characters is changed by presetting the counter 10 during the extinguishing pulses, thereby improving the reliability of the display of information, since eliminated distortions on the screen of the television indicator 4 when changing the sequence of lines, carried out by the block 12 input of the starting address. 1 il.

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The invention relates to computing and automation and can be used to display information from a computer. five

The purpose of the invention is to increase the reliability of the displayed information.

The drawing shows a functional block diagram of the device.

The device comprises a pulse generator 1, a first counter 2, a video signal generator 3, a television indicator 4, a quench pulse generator 5, a multiplexer 6, a register 7, a memory block 8, a synchronization block 9, a second counter 10, a switch 11, an initial address input block 12.

The drawing shows address input 13, read control input 14, information input .15, write control-16 input, device, device symbol code output 17.

The device works as follows.

The symbols of the reproduced textual information 25 are synthesized from decomposition elements corresponding to raster points, the values of which are bit-wise as information words stored in block 8 of the buffer memory. The position of the radial beam on the raster is determined by the state of the counters 2 and 10. The counters input of the counter 2 receives pulses with a frequency of the generator of 1 pulses. For the return path of the electron beam in rows in each frame there is a certain number of non-displayable raster lines. Shaper 5 pulses of damping generates a signal that provides damping corresponding. raster points. The specified output signal of the driver 5 is supplied to the block 9 synchronization.

Block 9 synchronization on the leading edge of the damping pulses generates horizontal and vertical clock pulses, which ensure the synchronization of the raster on the screen of the television indicator 4.

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For sequential output of information words from block 8 of the buffer memory to the screen of the television indicator 4, counters 2 and 10 produce a cyclical sequence of $$ codes for the address of the displayed information, which through multiplexer 6 and switch 11 goes to the address inputs of the block 8 of the buffer memory.

Block 8 of the buffer memory is in the "Read" mode with no "Record" signal from the input 16 of the device. Cyclic-readable information from block 8 of the buffer memory is written to the video signal generator 3 by a strobe signal from the first counter 2. The imaging unit 3 performs parallel-sequential conversion of information words with a clock frequency of the output signal of the pulse generator 1. The blanking signal is not displayed points and raster lines from the output of the imaging unit 5 blocks the formation of the video signal. The displayed information is mixed in the imaging unit 3 of the video signal with the signals of the personnel and horizontal sync pulses, respectively, coming from the output of the synchronization unit 9. Shaper 3 video signal generates a complete video signal at the input of the television indicator 4 to control the brightness of the beam and ensure the raster synchronization.

Synthesized from the raster points' symbols of the displayed text in-. Formations are placed in groups of adjacent lines of raster points that form lines of text characters. To shift the lines of text characters, instead of overwriting the entire contents of block 8 of the buffer memory, simply shift the cyclic sequence of codes of the addresses of block 8 of the buffer memory relative to the start of the raster sweep. The specified shift is achieved by pre-installing the counter 10 personnel sync signal from the output of block 9. synchronization, while the value of the presetting of the counter 10 comes from the cell of the block 8 of the buffer memory at the address preset by the switches of the dial field of the block 12 for entering the start address connected to the address inputs of the block 8 of the buffer memory through the switch 11 during the frame sync pulse from the output of block 9 sync. Changing the contents of the specified memory cell sets the current version of the sequence of displaying strings of characters to the screen of the television indicator 4, while changing., This option is synchronized with the scanning of the television indicator 4.

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Data exchange with a computer is as follows.

To load block 8 of the buffer memory of the computer, the memory address of the memory cell is input to input 13, and the Record signal is used to input device 16, the multiplexer 6 is switched over, the address inputs of the buffer memory block 8 are connected to the device input 13, and the information from the input 15 of the device is recorded in memory.

To control the displayed information, the computer can read the contents of block 8 of the buffer memory. To do this, the address of the readable memory cell is set to the device input 13 and the read signal is sent to the device input 14, where the multiplexer 6 connects the device input 13 to the addrespective inputs of the buffer memory unit 8, the read information is written to the register 7, and at the output 17 of the device, the information of the readable memory cell appears. 25

Thus, the invention provides an increase in the reliability of the displayed information due to the fact that distortions of information on the screen of the television indicator 30 are eliminated when changing the display sequence of character lines, since the display sequence of the display 'lines is produced during damping pulses.

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Claims (1)

Claim A device for displaying information on a television indicator screen ₄₀ comprising a pulse generator, a first counter, a blanking driver, a synchronization unit, a video signal generator, a multiplexer, a register, a memory unit whose output is connected to the information input of the register and to the first information signal generator input The gating input of which is connected to the first output of the first counter, the second and third outputs of which are connected to the inputs of frame and line synchronization of a form73 of the damper, the first and second outputs of which are connected to the inputs of the blanking signals of the synchronization unit, the first and c. o, its outputs are connected to the horizontal and vertical synchronization inputs of the video signal former, the blanking signals input is connected to the third output of the blanking pulse generator, the output of the pulse generator is connected to the counting input of the first counter, the fourth output of which is connected to the first information input of the multiplexer, the second information input which is the address input of the device whose read control input is the first control input of the multiplexer and in. | D recording control register, the output of which is the output of the device symbol code, whose information input is the information input of the memory block, the recording control input of which and the second control input of the multiplexer are the recording control input of the device, the output of the video shaper is connected to the television indicator input, that, in order to increase the reliability of the displayed information, the device contains a second counter, a block for entering the starting address and a switch that controls the input d which one and the control input of the recording of the second counter? connected to the second output of the syn- and chronization block; the output of the pulse generator is connected to the clock input of the globalizer; the fifth output of the first counter is connected to the counting input of the second counter, whose information input is connected to the output of the memory block, the output of the second counter is connected to the third information input the multiplexer, the output of which is connected to the first information input of the switch, the second information input of which is connected to the output of the input address input block, the output of the switch is connected to a esting input of the storage unit.