SU1656520A2 - Television data display unit - Google Patents

Abstract

The invention relates to automation and computing and can be used to display information from a computer. The purpose of the invention is to increase the information content of the device due to the possibility of displaying the selected groups of characters by changing their angle of inclination. For this, a frequency divider and corresponding functional links are introduced into it. The invention makes it possible to isolate various semantic groups of displayed symbols by quickly changing their angle of inclination. 1 il.

Description

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

The purpose of the invention is to increase the information content of the device due to the possibility of displaying the selected groups of characters by changing their angle of inclination.

The drawing shows a block diagram of the device.

The device contains a television indicator 1, a one-shot 2, a block 3 of conjugation, a character generator 4. the first shift register 5, the first — fifth triggers 6–10, the AND-NE element 11, the first OR-NOT 12 element, the sixth trigger 13, generator 14 pulses, the second shift register 15, the register 16, the third shift register 17, multiplexer 18, block 19 of the helms OR-NOT, seventh trigger 20, the element EXCLUSIVE IL AND 21, the element AND 2 and the divider 23 frequency.

As an interfacing unit 3, the CRT controller KR580VG75 can be used.

The device works as follows.

After power is turned on, generator 14 begins to emit clock pulses. The frequency of the clock pulses is divided by a frequency divider 23. In this case, the computer to which this device is connected must, by one of the known methods (for example, writing constants in software-accessible registers specifically designed for controlling the generator and divider), frequency of the pulse generator 14 and the division factor of the frequency divider 23. Shift register 15 is set to an arbitrary state. On the falling edge of the clock pulses from the output of the divider 23 arriving at the clock input of the register 15, this arbitrary combination is shifted. After

at

AND

About SP

about

01 N3 O

ABOUT

the first logical G of the shifted combination according to the third output of the register 15 is the highest bit of the group of outputs of the shift register 15) and the control input of the register 15, the latter switches to the parallel information recording mode. On the falling edge of the next pulse, the synchronization information, for example, 00000001) from the group of parallel inputs of register 15 is recorded in the given register and simultaneously set at the outputs of the group of register 15. Register 15 switches to the information shift mode. Subsequent pulses from the output of the divider 23 shift the information until the third output of the register 15 is again set to logical 1, which results in the synchronization record to the register 15, a shift, etc.

The process is repeated cyclically.

The symbol tilt command is issued by the conjugation unit 3 as logical 1 at the eighth output, which sets the seventh trigger 20 on the leading edge of the pulses generated at the output of the sixth trigger 13 to the logical state 1. At the inverse output of the seventh trigger 20, and hence at The first inputs of the OR-NOT elements of block 19 are set to a logical level of O. The second inputs of the elements of OR-NOT of block 19 receive the code of the current line number. As long as the first inputs of the elements of OR-NOT of block 19 are set to logic level 1, there are also zeros on the address inputs of multiplexer 18, and information from the output of shift register 5 is passed to its output. Logic O, arriving at the first inputs of the OR-NOT elements of block 19 from the inverse output of the seventh flip-flop 20, allows the code of the current line number to be passed from the outputs of register 16 for storing it. In this case, the code of the current line number is inverted. Depending on the code of the current line number set at the address inputs of the multiplexer 18, the output from the multiplexer 18 passes information from the output of the shift register 5 or from one of the outputs

register 17 shift. The larger the current line number, the shorter the time delay. Thus, the lines with the smaller number of the reproduced character are shifted in time more strongly than the lines with the larger number. This achieves the tilt effect of the characters.

The slope of the extracted characters is determined by the frequency of the oscillator 14. Than

the higher the frequency of the generator 14, the greater the angle of inclination (counting from the horizontal) the symbol has. The frequency at the output of the frequency divider 23 should always be equal to the frequency of the raster points

FT / n Fp t const,

where FT / n is the frequency at the output of the splitter 23; Fp.r - the frequency of raster points. The frequencies FT and FT / n are related as follows:

20

Fp.T. -Fy / n

FT

where n is the division factor of the frequency divider 23.

The tilt angle of the symbols, equal to 45 °, will be subject to FT FT / n, with n 1; when n 2 and FT 2 FT / n. tilt angle will be 60 °, etc.

Thus, by quickly changing the frequency of the pulse generator 14 and the frequency divider 23, it is possible to change the angle of inclination

characters on the screen.

Claims (1)

The invention The device for displaying information on the screen of a television indicator according to auth.St. No. 1515157, different By the fact that, in order to increase the informativeness of the device due to the possibility of displaying the selected groups of characters by changing their angle of inclination, a frequency divider is inserted in it, the output of which connected to the clock inputs of the first and second shift registers and the sixth trigger, and the information input of the frequency divider is connected to the output of the pulse generator, the input of which is the first the control input of the device, the setup input of the frequency divider is the second control input of the device. f h ft 3 22 13 Compiled by C, Kazakov Editor L. Vesel about the Century Tehred M. Morgental Corrector O. Kravtsova H 18 12 / -