SU1269180A1 - Device for displaying information on screen of cathode-ray tube - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used to display digital data in the form of graphs on a raster screen. The purpose of the invention is to expand the field of application of the device by displaying graphs, the ordinate codes of which are fed to the input of the device with a randomly varying in time frequency, and the simplification of the device, achieved by introducing into the device a series-connected trigger, element I, single vibrator and functional links. 1 il.

Description

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The invention relates to automation and computer technology and can be used to display digital data in the form of graphs in display devices based on a raster imaging method.

The purpose of the invention is to simplify the device and expand its area of application by displaying graphs whose ordinate codes arrive at the input of the device with a randomly varying in time frequency.

The drawing shows a block diagram of the device.

The device contains a generator of I pulses, a counter of 2 raster points vertically, a shaper of 3 horizontal sync pulses, a counter of 4 raster points horizontally, a shaper of 5 frame sync pulses, trigger 6, element OR 7, element AND 8, a single vibrator 9, counter 10 addresses of the recording of ordinates, ordinate read address counter 11, switch 12, register 13, memory block 14, comparison block 15, video signal generator 16, CRT 17.

The pulse generator 1 generates signals, the period of which corresponds to the time of displaying one element on the screen. The signals from the pulse generator 1 are fed to the counter input of the 2 raster points along the vertical, which is the counting input. The information output of the counter of the 2 raster points vertically is connected to the second input of the comparator unit 15, and the control output, which is the transfer output, to the input of the generator 3 horizontal sync pulses and to the counter input of the 4 raster points horizontally, which is the counting input. The shaper of 3 horizontal sync pulses generates horizontal sync pulses of a given duration when the transfer signals are received at its input. Horizontal sync pulses from the imager 3 horizontal sync pulses arrive at the scanner (not shown), the control input of the switch 12, the second inputs of the OR element 7 and the AND 8 element, as well as the first control input of the counter 11 address reading ordinates, which is counting input.

The output of the counter of 4 horizontal raster points, which is the transfer output, is connected to the input of the imaging unit 5 frame sync pulses, which form the frame sync pulses of a given duration when the transfer signals arrive at its input. The frame sync pulses from the imaging unit 5 frame sync pulses go to the scanner, to the first input of the element OR 7 and to the second control input of the counter 1 1 ordinate read address, which is the input control input.

The trigger 6 is designed to store a signal strobe the information arriving at the device input. The output of the trigger 6 is connected to the first input of the element AND 8 and to the control input of the register 13, which is the input to control the reception of information. The control input of the trigger 6, which is the input of the initial setup, is connected to the output of the one-shot 9. The single-oscillator 9 generates the signals necessary for the operation of the device. The input of one-shot 9 is connected to the output element And 8. Counter 10 addresses of the recording of ordinates generates the address of the recording codes of ordinates of graphs in the process of receiving information by the device. The output of the counter 10 addresses of the records of the ordinates is connected to the first input of the switch 12 and the information input of the counter 11 addresses of the reading of the ordinates, and the control input, which is the counting input, with the output of the one-vibrator 9. The counter 1I of the addresses of the reading of the ordinates generates the addresses of reading the ordinate codes of the graphs in the process display information on the screen. The output of the address counter 11, the reading of the ordinates is connected to the second input of the switch 12. The conversion factors of the counter 10 addresses of the write of the ordinates and the counter 11 of the addresses of the reading of the ordinates are equal to each other and equal to the number of cells of the memory block 14. The output of the switch 12 is connected to the address input of the memory unit 14, and the control input, which is the input of the switching control, to the output of the driver 3 horizontal sync pulses.

Register 13 is intended for the temporary storage of incoming information to the device. The output of register 13 is connected to the information input of memory block 14. The memory unit 14 serves to store the codes of the ordinate points of the graphs displayed on the screen during one frame. The output of memory block 14 is connected to the first input of comparator 15, and the control input, which is the write-read control input to the one-shot 9 output. Memory block 14 contains Ti-bit cells, where t is the number of graph points displayed on the screen during one frame, an is the size of the ordinate codes of the graphs. The output of the comparator unit 15 is connected to the input of the imaging unit 16 of the video signals. The output of the imaging device 16 of the video signals is connected to the CRT modulator 17, and the control input is connected to the output of the OR 7 element.

CRT 17 converts digital information into a visible image of a television raster.

The device works as follows.

For imaging on a CRT 17 screen, a vertical television scan is used. The display of graphs, the ordinate codes of which arrive at the input of the device with a frequency randomly varying in time, is carried out by continuously moving the image of the graphs on the screen from left to right. When moving, points of graphs located on the right side of the screen are lost. Plot points, the ordinates codes of which are input to the device, are displayed in the free space on the left side of the screen. At the time of one frame, the device receives from O to / (codes of ordinates of graphs, moreover. When Kt of points, graphs are lost, since only m points can be displayed on the screen. When the device is operating from the generator of 1 pulses, the input of the counter 2 the points of the raster along the vertical signals are received, the period of which corresponds to the time of displaying one point of the raster. The coefficient of recalculation of the counter of 2 points of the raster along the vertical is equal to the total number of signals produced by the generator 1 pulses at the time of reverse and forward strokes From the initial state of the counter of 2 points of the raster along the vertical, counts the number of signals corresponding to the reverse course of the horizontal sweep, and then the counting of the signals corresponding to the forward course of the horizontal scanning begins. During the forward course of the horizontal sweep, the counter of 2 raster points along the vertical counts the entire number of points of the raster on the vertical axis, after which it generates a transfer signal and sets to its initial state. The information output of the counter 2 raster points along the vertical at any moment of time contains information characterizing the position of the beam along the vertical axis on the screen of the CRT 17. At the output of the former 3 horizontal sync pulses, the horizontal sync pulses are generated with the transfer signals whose duration is equal to the horizontal sweep time. Inline sync pulses synchronize the operation of the scanner, as well as provide control of other parts of the device. The input of the counter of 4 points of the raster horizontally receives signals of transfer from the counter of 2 raster points along the vertical, the follow-up period of which corresponds to the follow-up period of the horizontal sync pulses. The recalculation coefficient of the counter of 4 horizontal raster points is equal to the total number of horizontal sync pulses generated during the reverse and forward strokes of the frame sweep. From the initial state, the counter of the 4 horizontal raster points counts the number of horizontal sync pulses corresponding to the reverse frame scan, and then the horizontal sync pulses counting corresponding to the forward frame vertical scan begins. During the forward course of a frame scan, a counter of 4 horizontal raster points counts the entire number of raster lines on the horizontal axis, and hence the number of raster points on the horizontal axis, after which it generates a transfer signal and returns to its initial state. At the output of the imaging unit 5 frame sync pulses, frame sync pulses are formed with the help of transfer signals, the duration of which is equal to the reverse time of the frame scanning. Frame sync pulses synchronize the operation of the scanner, as well as provide control of other parts of the device. During operation of the device, information in the form of ordinate codes of the graphs is fed to the information input of the register 13. A signal strobe the input information (information strobe) is transmitted to the input of the trigger 6 and sets it to one state. Using the output signal of the trigger 6, the information is recorded in the register 13. The signal from the output of the trigger 6 also enters the first input of the And 8 element and enables the transfer of the horizontal sync pulse to the input of the one-vibrator 9. During the horizontal flyback, the horizontal sync pulse from the horizontal 3 pulse synchro is received to the control input of the switch 12, ensuring the connection of the output of the counter 10 addresses of the recording of the ordinates to the address input of the memory block 14 for the time of the horizontal retraction. In addition, the horizontal sync pulse from the shaper 3 horizontal sync pulses is transmitted through the element AND 8 to the input of the one-shot 9. If the trigger 6 is in the unit state. The single-vibration 9 generates a signal which is fed to the control input of the memory unit 14 and records the incoming information. At the end of the signal of the one-shot 9, the content of the counter 10 addresses of the recording of the ordinates per unit increases and the trigger 6 is set to the initial state. Thus, during the flyback of the line scan, the newly received schedule ordinate code is recorded in memory block 14 at the address determined by the output of the counter 10 addresses of the ordinate record, the next address of the schedule ordinate code is formed, and preparations are made to receive the new information by Setting trigger 6 to zero. During the line horizontal sweep, the memory unit 14 is in the information reading mode, since regardless of the state of the trigger 6, the output of the And 8 element has no signal, and therefore there is no control signal at the output of the one-vibrator 9. At the time of In the horizontal sweep by means of the switch 12, the output of the counter 11 addresses of reading ordinates is connected to the address input of the memory block 14. After the end of the line horizontal sweep, the horizontal sync pulse increases the content of the counter 11 addresses of reading the ordinates by one. Thus, during the forward stroke of a line scan, the chart's ordinate code is read from memory block 14 at the address determined by the output of the ordinate read address counter 11, and after the end of the horizontal line stroke is completed, the next chart read address of the ordinate code is generated.

During a frame sweep, the frame sync pulses the current value of the counter 10 of the ordinate write address, which is the address of the first ordinate of the plot point read to display in the next frame, in counter 11 of the ordinate reading address.

Since the recalculation coefficients of the counter 10, the addresses of the entries of the ordinates and the counter 11 of the addresses of the readings of the ordinates are equal to each other and equal to the number of cells of the memory block 14, the ordinate codes of the graphs that arrive last into the memory block 14 are also the last to form the graphs.

Due to this, moving the image of the graphs on the screen. The amount of movement is determined by the number of codes of the ordinates of the graphs that arrive at the input of the device during the time of one frame.

The ordinate codes of the graphs, read from the memory block 14, are fed to the first input of the comparison block 15. At the second input of the comparison unit 15, n-bit binary codes, varying from the minimum to maximum value of the ordinate codes of graphs, characterizing the position of the beam on the CRT screen along the vertical axis, are received from the information output of the counter of 2 raster points. At the moments of equality of the codes of the graphs to the codes transmitted from the information output of the counter of 2 raster points along the vertical, signals are input to the input of the imager 16 video signals.

The video signal generator 16 converts the signals from the comparison unit 15 into luminance signals designed to control the brightness of the CRT beam 17. To the control input of the video generator 16 video signals from the output of the OR 7 element

a signal is transmitted that prohibits the passage of a luminance signal to the CRT modulator 17, both during the frame vertical retraction and during the horizontal scanning retraction, because the frame sync pulses go to the first element OR 7, and the horizontal sync pulses go to the second input.

Claims (1)

Invention Formula A device for displaying information on a cathode-ray tube screen containing serially connected pulse generator, vertical raster point counter, horizontal raster point counter, framing frame sync pulses, OR element and video shaper connected to a CRT modulator, register, first input of which is the information input of the device, the memory block, the output of which is connected to the first input of the comparison unit, the second input of which is connected to the output of the raster point counter vertically connected to the input of the horizontal sync pulse generator, the output of which is connected to the second input of the OR element, the outputs of the horizontal and frame sync pulse generators are device inputs, characterized in that, in order to simplify the device and expand its use by displaying graphs, the ordinate codes of which arrive at the input of the device with a randomly varying in time frequency; it contains a trigger connected in series, the input of which is the input of the device strobe, the And element and the one-shot The device whose output is connected to the control input of the memory unit whose address input is connected to the switch output, the second trigger input and the input address counter record of the ordinate, the output of which is connected to the first input of the switch and the information input of the address reader address counter, the output of which is It is connected to the second input of the switch, the output of the horizontal sync pulse generator coeAHHeii with the second input of the element I, the first control input of the address reader address counter, the second control input of which n with the output of the vertical sync pulses, the trigger output connected to a second input of the register, the output of which is connected to the data input of the memory unit. To block deploy and.