SU1252814A1 - Device for displaying information on screen of television receiver - Google Patents

Abstract

The invention relates to the field of automation, auxiliary and television equipment, and can be used to display symbolic information on the screens of television receivers and various matrix panels, which are scanned using digital scanning functions. The purpose of the invention is to improve the accuracy due to the possibility of smoothly moving the image horizontally on the screen, which is achieved by introducing a frequency divider, an interdiction element and functional connections, which makes it possible to organize a time varying advancement of the start of operation of the horizontal scanning generator with respect to the clock of the television receiver. This leads to the implementation of a moving text mode in the horizontal direction, allowing the reading of information from large data sheets. 1 il. W you ate

Description

The invention relates to automation and computing and can be used in the output of character-graphic information on the screen of a television receiver.

The purpose of the invention is to improve the accuracy of the device due to the possibility of smoothly moving the image horizontally on the screen.

The drawing shows the functional diagram of the device.

The device contains a random access memory unit 1 for recording and storing codes of displayed symbols or graphic elements, a 2-character generator, a video signal generator 3, a television receiver 4, a frequency divider 5, an image start shift pulse counter 6, a bar element 7, an 8 character counter in a row, a 9-line horizontal shaper, a synchronizer 10, an 11-clock pulse generator, a 12-line counter, and a 14-frame shaper.

The device works as follows.

From the input 14, character codes are written to memory block 1, from which, at the frequency received from the first output of the line 9 scanner, to the second input of memory 1, depending on the number of displayed characters (if character information is displayed) in one line of text on the television receiver 4, are fed to the first input of the generator 2 characters. In a 2-character generator, character codes are converted into CRT beam illumination pulses.

Signals gating the issuance of a 2-character generator's CRT beam illumination pulses to the output of the imaging unit 3 video signals are fed to the second generator input 2 characters from the second output of the imaging unit 9 horizontal scanning. The pulses determining the generation by the generator of 2 characters of a vertically defined row of pulses of illumination of a CRT beam of the decomposition matrix of the symbol are sent to the third input of the generator 2 characters from the second input of the frame scanner 13. The signal conditioning unit 3 performs the function of summing the pulses of the CRT beam during the forward television sweep code with the television clock signal which is received.

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This second input of block 3 is formed-} 1i of video signals from the first output of synchronous generator 10, as well as the function of matching the output of block 3 of forming video signals with the input of television receiver 4 by electrical parameters.

The shapers 9 and 13, respectively, of the line and frame sweep, are the decoders of the counter states and form the pulse sequences that control the operation of the RAM unit 1 and the 2 character generator.

Counters 8 and 12, respectively, perform sampling of generators, telles 9 and 13 of line and frame scans.

The generator 11 generates, the frequency of discretization of the television line horizontally. The period of its frequency is equal in duration to the smallest element of character discretization horizontally. At the same time, the generator 11 generates the frequency necessary for the operation of the clock generator 10. It enters the input of the clock generator 10

from the first start of the clock generator 11.

The horizontal sampling rate of the character elements to the second input of the counter 8 characters per line, which is its counting input, comes from the output of the prohibition element 7 during the forward stroke of the horizontal sweep of the television receiver 4. This frequency is fed to the first input of the prohibition element 7 from the second output of the generator 11. Gating the sampling frequency of character elements horizontally to the counting input of the counter 8 takes place via the second input of the prohibition element 7, to which the GIS pulses come from the fourth synch output ogeneratora GIS 10. The pulses arrive simultaneously and to the fourth input of the counter 8, the gate on time of occurrence of pulses thereon GIS installation at the output of last binary counter, which is mounted at its inlet setup. The initial setup, which is rewritten each time during the OMS on the output of the counter 8, is formed by the counter 6, from the output of which this installation goes to the first input of the counter B characters.

An increase in the setpoint, which occurs with the arrival of each next pulse to the counting input of counter 6, causes a change in the shift in the start of the display of characters with respect to the decline in the pulses of the GIS. The latter is visually perceived as the movement of the information line on the screen of the receiver 4 from right to left, which corresponds to the natural reading of the text from left to right.

The speed of movement of information is determined by the frequency that arrives at the counting input of counter 6 from the output of the frequency divider 5, which is intended to set the speed of two information.

With the division factor of divisive, l 5 frequencies equal to four provide. The speed of text movement in a line is approximately equal to one character per second.

Claims (1)

Invention Formula A device for displaying information on the screen of a television receiver, comprising a series-connected main memory unit, the first input of which is an input. The character codes of the device, the character generator, the second and third inputs of which are connected to the first outputs of the horizontal and frame scanners, respectively, and the video signal generator, the output of which is connected to a television receiver ten 15 328144 clock generator, the first output of which is connected to the input of the synchro generator, the output frame damping pulses of which are connected to the first input of the row counter, which is connected to the input of the frame scanner, the second output of which is connected to the second input of the operating memory, outputs The reset pulses and the horizontal damping pulses of the synchro-generator are connected respectively to the first and second inputs of the character counter in the row, which is connected to the input of the horizontal scanner, the second output D which is connected to the third input of the memory block, the output of the TV sync mixture of the synchronous generator is connected to the second input of the video signal conditioner, and the counter of the shift of the beginning of the image, the output of which is connected to the third input of the character counter in the row, which is increasing the accuracy due to the possibility of smoothly moving the image horizontally on the screen; it contains a frequency divider, the input to which is connected to the output. Frame damping pulses of the clock generator, and a prohibition element, he first and second inputs connected respectively to the second output of the clock generator and the output Lowercase blanking clock pulses, and an output - to a fourth input of characters in the row counter, the output of the frequency divider is connected to the counting input of pulse counter start offset image. 20 25 0 five t Pods cufido / ioff 12 VNYUSHIZakaz 4624/51 Circulation 455 Subscription Production.-polygraph, pre-e, Uzhgorod, st. Project, 4