SU1357998A1 - Device for displaying information on television indicator screen - Google Patents

Abstract

The invention relates to computer technology and can be used in the construction of display devices for information on the screen of television receivers, in particular, for personal computers, display complexes of various purposes, coupled with applied television systems. The purpose of the invention — improving image clarity — is achieved by introducing the HE elements 21 and 24, the AND elements 22 and 25, and the flip-flops 23 and 26 with corresponding functional connections, which provides a significant reduction in the effect of distortions due to insufficient TV bandwidth. In this case, a sequence of codes of the beginning (10) or end (01) of the video signal is identified. On trigger 26 (23), the edge identification signal is delayed by one clock and fed to adder 7 as a pre-distortion signal for addition to the main video signal or subtraction. 2 Il. o (L have eaten with co 00 ipn.l

Description

The invention relates to computer technology and can be used in the construction of display devices for information on the screen of television receivers, in particular, for personal computers, display complexes of various purposes, coupled with applied television systems.

The purpose of the invention is to improve image clarity.

FIG. 1 - shows a functional diagram of the device; in fig. 2 - time charts.

The device contains a data input unit 1, a write switch 2, a memory block 3, a read switch 4, a 5-character generator, a video signal forming unit 6, an adder 7, a television indicator 8, a pulse selector 9, a symbol decomposition element generator 10, a decomposition counter 1 1 Symvola, counter 12 characters per line, counter 13 television lines, counter 14 lines of text, analog-to-digital converter 15, pe1 source 16 addresses familiarity in the line, register 17 addresses of lines, register 18 scales and marker, block 19 comparison, register 20 ordinates count Single first NOT element 21, the first AND gate 22, a first flip-flop 23, a second NOT element 24, the second AND gate 25, the second flip-flop 26.

The device works as follows.

At the input of the pulse selector 9 comes a television video signal containing plot information about the object depicted on the television screen. The pulse selector 9 extracts from the full television video signal the horizontal and frame synchronization pulses. The synchronization pulses clocks the operation of the entire device, allowing two operating modes to be performed in parallel: the mode of recording information in memory block 3 during the horizontal and frame sweeps backtracking and the mode of reading information from memory block 3 during the forward sweeps.

In the recording mode, either alphanumeric textual information, text information from data input unit 1, or oscillographic information about the process under study from the analog-digital converter 15 and the numerical value of any reference of the graph from the register 20 of the ordinate of the graph is entered into the memory block 3. When entering text information from the second and third outputs of the data input unit 1, the address code corresponding to the address on the television screen of the current character is sent to the second inputs of the register 16 of the address in the row and the register of the row addresses. The address code from the outputs of the register 16 addresses familiarity in the line and the register 17 addresses of the lines is supplied to the address inputs of block 3

the memory and determines the number of the memory location into which the information is stored.

From the first output of the data input unit 1, the encoded information of the input character arrives at the information input of the recording switch 2. The recording switch 2 passes the coded signal to the information input of the memory 3 only during the reverse stroke of the horizontal and frame sweeps, for which sync signals from the second output from the pulse collector 9 are sent to its control input. filed at the information entry at the address, indicated by iy address code on

5 of his address inputs. If the text information is entered into successive cells of the memory, then the registry 16 of the address in the row and the register 17 of the row addresses work in the counting mode and the information from the output of the register 16 is transferred.

0 addresses of familiarity in line to the counting input of the register of 17 addresses of lines.

When entering into the memory block 3 of the oscillographic information, the address code of the memory cells (familiarity in the line and the number

5 lines) defines the analog-to-digital converter 15. From its first input to the input of the address register 16, a digital code corresponding to the element number of the input graphic image is inserted in the line. Simultaneously, from the second output of the analog-to-digital converter 15, a digital code proportional to the counted value (value) of the signal under study is fed to the input of the row address address register 17 at the current time. This way, the signal converted into an analog-to-value code (for example, voltage to code) sets the address of the line to which graphic information should be written in the form of a certain sign (for example, a dash). This constant sign information is entered through the first, informational, input of the memory block to the address., The code of which comes from register 16 of the address of the familiarity in the line and register of 17 of the address of the lines.

In order to display any digital value of the graph along the television line, digital information about the counting value of the graph is also entered in the 3-m. In this case, the fourth output of the block 1 of data entry in the register 18 of the scales and the marker is entered

0 information about the number of the line item and the range of lines that determines the position of the marker on the television screen. During the forward run of the frame and line scan (read mode) with the coincidence of the codes applied to block 19

5 register 18 scales and a marker, with codes received on the second and third inputs, respectively, from the second output of the counter 12 characters per line and the first output of the counter 14 lines of text, comparison unit 19 generates a signal at the input of the register 20 of the ordinate of the graph, allowing The last recording of information is the B time points of the television sweep corresponding to the position of the marker on the screen.

With the arrival from the switch 4 of the readout at the input of the register 20 ordinates of a chart of a code other than zero (signaling that the chart intersects with the marker), the current digital value of the counter is written 14 lines of text equal to the readout value of the chart at the position of the marker. This digital value is entered through the switch 2 records during the reverse television sweep code in the memory cells of the memory block 3, the address code of which comes from the register of the familiarity address 16 in the string and the register of the address 17 lines.

The device operates in the information reading mode under the control of a counter 11 character decomposition elements, a counter of 12 characters per line, a counter of 13 television lines and a counter of 14 lines of text connected in series, as well as a pulse selector 9. The synchronization pulses from the output of the pulse selector 9 arrive at the generator 10 elements of the decomposition of the symbol, launching it during the forward stroke of the horizontal and vertical sweeps. Thereby, the image elements are tightly attached to the beginning of the television frame and line.

The generator 10 generates pulses with a frequency exceeding the frequency of the elements of the decomposition of the image of the television signal. These pulses are fed to the input of the counter 11 and further to the counters 12-14 operating in the counting mode. The current values of the digital codes from the outputs of the counter are 12 characters per line and the counter, 14 lines of text are fed to the second control and address inputs of the memory block 3. These codes determine the current address of the memory location from which information is currently being read.

During the forward motion of the television scans, the memory cells of the memory block 3, via the switch 4, read by the signal to the control input of the switch 4, read from the pulse selector 9, is copied to the generator 5 symbols. The 5-character generator decomposes the digital code of a character into television lines (character generation) using a signal applied to its input from a counter of 13 television lines. A parallel digital code from the output of the 5-character generator is fed to the video signal shaper 6, where using the signals coming from the output of the counter 11 symbol decomposition elements, a time code sweep occurs.

The generated video signal carrying textual, graphical and numeric information from the output of the video signal generator 6 is fed to the adder 7. The third information input of the adder 7 receives a video signal containing subject information about the displayed object (process) process. The first information input of the adder 7 from the comparison unit 19 receives a signal with information about the place of the marker, as well as horizontal and vertical signals, which serve to facilitate the reading of the values of the signal under study. The position of the keys is determined by the numbers stored in the register 18 of the scales and the marker entered from the data input unit 1. Vertical scales are formed in comparison block 19 using signals from the output of the counter 12 characters per line, and horizontal scales using signals from the input of comparison block 19 from the counter 14 lines of text. The full video signal from the output of the adder 7 is fed to the video input of the television indicator 8, where the displayed image is formed.

In a television indicator, the display signals (close to square pulses) are distorted due to their unfavorable frequency (transient) characteristics of the video path.

The quality of the information display essentially depends on the upper limit frequency of the television indicator bandwidth. For standard tele5 vision receivers and video monitoring devices, this frequency is about 6 MHz and is close to the optimum (in definition and signal-to-noise ratio) for received stanR1 dart decomposition of plot information (625 lines, 50 frames / s) in television broadcasting. When simultaneously displaying the plot (television) and display (alphanumeric, graphic, etc.) information, the specified cutoff frequency is insufficient. it

5 causes a deterioration in the image quality of the display information, expressed in different luminance of horizontal and vertical signs and blur elements of separately standing points, as well as end points of horizontal segments. In fact, for a good quality display of video display signals, an upper cut-off frequency of the video path of at least 10 MHz is required.

The first element HE 21, the first element AND 22 and the first trigger 23 perform the function of generating correction pulses of the leading edge (beginning) of the video signals. This impulse is generated when

the two extreme bits of the video code from the output of the imager 6 video signals have the value “10 (the 1-high level corresponds to the glow of the indicator kinescope). At the indicated values of the video code (taking into account the inversion on the element NOT), from the output of the element AND 22 to the input of the trigger 23 a high potential is received ("1). According to the following clock pulse, coming from the output of the counter, 11 elements of the decomposition of the symbol to the control input of the imaging unit 6 video signals (shift) and: to the synchronous input of the trigger 23, to the second input; the formation input and the summing input of the adder almost simultaneously receive positive signals, since the first output of the video signal maker shifts "1 previous bit, and at the output of trigger 23 it is set to" 1. In the adder 7, these signals are stored: this contributes to an increase in the rate of increase of video signals in the indicator 8. Similarly, the trailing edge (end) of the video signals is corrected: the second elements PE 24, the second element I 25 and the second trigger 26

In this case, a correction pulse is generated when the two extreme bits of the driver 6 have the value "01. In adder 7, the correction pulse is subtracted from the video signal, contributing to the rapid discharge of the parasitic capacitances of the indicator and the acceleration of the falling edges of the video signal pulses. The degree of influence of the input predistortion on the increase in image quality can be adjusted by the weight resistances at the inputs of the adder.

The time diagram (Fig. 2) shows the display video signals of a point and I o-horizontal segment (Fig. 2a, the second input of the adder), electrical signals at the inputs of the kinescope indicator 8 in the absence of pre-distortions (Fig. 2 b) correction of the leading edge (Fig. 2c, the summing input of the adder), correction signals of the falling edge (Fig. 2g, subtracting the input of the adder), signals at the input of the adder in the presence of predistortion (Fig. 2d, output of the adder) and corrected signals the inlet of the kinescope (Fig. 2 e). Comparison of signals on a kinescope (Fig. 26 and 2e) shows that in the proposed device, the form of display video signals is significantly improved, the high-frequency distortions of the indicator are reduced, and the quality of information display is improved.

Claims (1)

Invention Formula A device for displaying information on a television indicator screen, containing a data input unit, the first output of which is connected to the first information input of the recording switch, the output of which is connected to the I1 information input of the memory unit, the first adress and control inputs of which are connected respectively to the first output of the register of the address of the familiarity in the line and the output of the register of the address of the lines whose counting input is connected to the second output of the register of the address of the familiarity in the line, the output of the memory block is connected to the ins | :: Ormac the ion input of the read switch, the control input of which is connected to the first output of the pulse selector, the first and second outputs of the read switch are connected to the first information input of the graph ordinate register and the address input of the character generator, respectively, the second output of the pulse selector is connected to the control input of the write switch, and the third output - with the trigger input of the generator for the decomposition of the symbol, the output of which is connected to the counting input of the counter for the decomposition of the symbol, the first output to costly connected to the counting input of a character counter in a line, the first output of which is connected to the counting input of a television line counter, the first output of which is connected to the counting input of a text line counter, the first output of which is connected to the first information input of the comparison unit and the second information input of the graph's ordinate register , the control input of which is connected to the first output of the comparison unit, and the output - to the second information input of the recording switch, the control input of the comparison unit is connected to the second output one character counter in the row, the second information input - with the register output and the marker, and the second output - with the first information input of the adder, the second information input of which is connected to the first output of the video signal conditioner, the third information input with the pulse selector input, which is the information input of the device, the third outputs of the character counter in the line and the text line counter are connected respectively to the second control meters and the address inputs of the memory block, the second counter output to the television The string is connected to the control input of the symbol generator, the output of which is connected to the information input of the video signal generator, the control input of which is connected to the second output of the symbol decomposition counter, the English and digital converter, the input of which is the second information input of the device, the first and second outputs are connected respectively, with the first installation inputs of the address addresses of the familiarity in the line and the addresses of the lines, the second installation inputs of which are connected respectively to the second and third The m outputs of the data input unit, the fourth output of which is connected to the register register and marker input, the adder output is connected to the video input of the television indicator, characterized in that, in order to increase the image clarity, the device contains two HE elements, two AND elements and two flip-flops, outputs which are connected respectively to the summing and subtracting inputs of the adder, the sync inputs to the second output of the decomposition symbol counter, and the mouth 5  Black level G / H: new inputs - to the outputs of the first and second elements And respectively, the first inputs of which are connected respectively to the outputs of the first and second elements NOT; the input of the first element is NOT connected to the second output of the video signal generator connected to the second input of the second element I, the input of the second element is NOT connected to the first output of the video signal conditioner connected to the second input of the first element I. Urodvn white Urobeni 5e / 1st Phage. 2