SU1675930A1 - Video signal generator - 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 expand the field of application of the device due to the possibility of forming an image with an arbitrary amplitude of image shift - achieved by introducing a second decoder, a second trigger, a second register, and corresponding functional connections. The invention allows the selection of symbols by oscillating movements in the vertical direction. 1 il.

Description

The invention relates to automation and computing and can be used in the output of information from a computer,

The purpose of the invention is to expand the field of application of the device due to the possibility of forming an image with an arbitrary amplitude of image shift.

The drawing shows a block diagram of the device.

The device contains a memory block 1, character generator 2, shift register 3, first pulse generator 4, 5 point counter, horizontal scanner 6, second pulse generator 7, switch 8, reversible counter 9, first decoder 10, first trigger 11, OR element 12, the first 13 and second 14 line counters, the first register 15, the multiplexer 16, the frame scanner 17, the second decoder

18, the second trigger 19, the second register 20. The positions indicate the device output, the first and second information inputs, the address input, the first and second control inputs, and the first and third synchronous inputs of the device.

The device works as follows.

When displaying information on the display screen to increase the informativity of the image, some characters, groups of characters, words or groups of words are distinguished by oscillating movements along the vertical. For this purpose, a special character is introduced — a binary code that precedes and completes the sequence of characters extracted by oscillating movements along the vertical.

From a computer (not shown), at the input 22, character codes and allocation codes are recorded in memory block 1 at the address

VI

SP

Yu

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The device is set to input 24 with a signal that permits writing to input 25. When a read enable signal is applied, input 25, when displaying information, the character codes go to character generator 2 and register 15.

The memory block 1 is controlled when reading information by the pulse sequences formed by the blocks 17 and 6 of the frame and line scans.

In character generator 2 and shift register 3, character codes are converted into successive bursts of pulses.

The clock frequency at the 5-point counter input comes from the output of the 4-pulse generator and determines the horizontal resolution of the display information on the display screen.

Counter 5 is set to O with the arrival of each horizontal extinguishing pulse to its reset input from input 27 of the device,

The register 15, controlled by the driver, in a line scan stores the codes of the characters and the codes of the characteristic of the selection. The decoder 18 on arrival in the register 15 of the sign code sends a pulse to the clock input of the trigger 19, which switches the inputs of the multiplexer 16. Upon the arrival of the first code of the selection flag, the decoder switches the trigger 25 to the single state. In this case, the multiplexer connects the second counter 14 to the frame scanner 17. lines. If the output of the trigger O, then the multiplexer connects to the imaging unit 17 frame scan the first counter of 13 lines.

The lower clock damping pulses go to the clock input of the counter 13, and it is set to the reset state by the frame (alternating pulses) to the initial state, which is set by the contents of the register 20.

The second counter 14 operates in a forced monotonously varying setup of the initial state during a frame damping pulse. On the clock input of the second counter of 14 lines, as well as on the clock input of the first counter of 13 lines, lower-case damping pulses arrive. Like the first counter of 13 rows, the second counter of 14 rows is set to About the front of personnel extinguishing pulses, but then is set by the information input to the state determined by the contents of the counter 9. If the initial state of the counter 14 changes upwards, then the selected characters will be shifted with discreteness of one TV line upwards on the screen. If the initial state of the second counter

lines will be monotonously changed in the direction of decreasing, then the selected characters will be shifted down the screen. Moreover, in either case, the speed of their movement is determined by the rate of change of the initial installation, which is determined by the frequency of the pulses fed to the input of the counter 9, which forms this installation.

The state of counter 9 varies with the arrival of each pulse at its clock input (either summing or subtracting) from the output of generator 7.

The generator 7 generates a sequence of pulses with a frequency that determines the speed of oscillations of the selected characters.

The oscillatory movement of the selected symbols is due to the fact that the state of the counter 9, which determines the setting, changes either upwards or downwards in accordance with the switching of 8 pulses by the switch, then to the summing input of the counter 9, then to subtract. The switch 8 is controlled by the trigger signal 11, which changes its state with the arrival at its clock input pulse from the output of the element OR 12,

 Register 20 sets the oscillation amplitude of the characters to be selected and represents

The 0 register where the constant number is stored, which is entered on the second information input, and then with frame dying pulses is rewritten into the counter of 13 lines.

5 Thus, the invention, when a group of symbols is selected by oscillating movements in the vertical direction, makes it possible to regulate the amplitude of oscillations.

Claims (1)

0 claims A device for generating a video signal, comprising a first and second pulse generator, a switch, a first trigger, an OR element, a reversible counter. point counter, first and second row counters, first decoder, memory block, horizontal scanner, multiplexer, vertical scanner, character generator, first register, 0, the shift register, the output of which is the output of the device, the information input of the shift register is connected to the output of the character generator, the first address input of which is connected to the first output 5 of the framing framer, whose touch input is connected to the multiplexer output, the first and second information inputs of which are connected to the outputs of the first and second row counters, respectively, the information input the character generator connected to the information input of the first register is connected to the output of the memory block, whose information, first address and control inputs are the first information, address and first control inputs of the device, respectively, the second address input of the memory unit is connected to the first the output of the line scanner, the second output of which is connected to the control input of the first register, the third address input of the memory unit is connected to the second output of the frame scanner, the second address The common input of the character generator is connected to the third output of the horizontal scanner, the fourth output of which is connected to the control input of the shift register, the clock input of which is connected to the output of the first pulse generator and the clock input of the point counter, the output of which is connected to the clock input of the horizontal scanner, the reset input of the counter points connected to the clock inputs of the first and second row counters and the control input of the character generator, is the first synchronous input of the device, the control input v The first row counter is the second synchronous input of the device, the control input of the first and the reset input of the second row counter are the third synchronized input of the device, the information inputs of the second counter rows are connected to the outputs of the reversible counter group and information inputs of the first decoder, the output of which is connected to the first input of the OR element, the second input of which is connected to the output of the reversible counter, the forward and reverse counting inputs of which are connected to the outputs of the switch, the control input of which is connected to the output of the first trigger, the clock input of which is connected to the output of the OR element, the information input of the switch is connected to the output of the second generator pulses, characterized in that, in order to expand application area of the device due to the possibility of forming an image with an arbitrary amplitude shift, it contains the second register, the second decoder, the second trigger, the output of which connected to the control input of the multiplexer, the clock input of the second trigger is connected to the output of the second decoder, whose information input is connected to the output of the first register, the reset input of the second trigger is connected to the reset input of the second row counter, the information input of the first row counter is connected to the output of the second register, information and the control inputs of which are the second information and second control inputs of the device, respectively. Csj