RU1837356C - Device for displaying cursor on screen of cathode-ray tube - Google Patents

Abstract

Usage: the invention can be used in radio and sonar, in data processing devices. Essence: the device contains a synchronization block 1, counters 2, 3, comparison blocks 4,5, 17,18, triggers 8, 9, shapers 10,11 impulses of scales, memory block 12, registers 13, 14, 15, 16, element And 19, subtractors 20, 21, adders 22, 23. 2 ill., 1 tab.

Description

The invention relates to techniques for displaying data and can be used in radio and sonar, in data processing devices,

The aim of the invention is to simplify and improve the accuracy of the device.

In FIG. 1 shows a functional diagram of a device; figure 2 is a view of the image of the marker on the screen of the television;

The device comprises a synchronization unit 1, an X coordinate counter 2, a Y coordinate counter 3, a first comparison unit 4, a comparison unit 5, a familiarity counter 6, a line counter 7, a first trigger 8, {a second trigger 9, a first scale pulse generator 10, the second generator 11 pulses of scales, block 12 memory, register 13 coordinates of the X center of the marker, register 14 coordinates of the Y center of the marker, register 15 of the scale coordinate 1 e X, register 16 of the scale coordinate Y, 1 third block 17 comparison, the fourth block 8 comparing the element And 19, the first subtractor 20, W ory subtractor, 21, first adder 22, second adder 23, first

Sumg

information input 24 of the device, second information input 25 of the device video input 26 of the television indicator, input 27 character selection, corner points 27-30 of the rectangle, within which the marker 31 is placed.

The invention is as follows. In modern locators, especially when working in the range strobe, the located object is visible on the indicator screen not as a point, but as a spot of a certain size. In this case, it is required to determine ke only the coordinates of this object, ko and its dimensions in two dimensions, for example, by distance and azimuth. In addition, it is desirable that the marker that the operator moves around the screen of the CRT can change its appearance, for example, to indicate the class of the object being located. For this, it’s convenient not only to move the marker on the screen B of two dimensions, but also to change its dimensions both horizontally and vertically, so that it is possible to cover with a marker a spotted object on the screen, so that the size of the marker exactly matches the size of tna. In this case, the operator controls

WITH

about

J

with

three control parameters, two of which move the marker around the screen, and two resize it, and also enter various kinds of characters used as a marker. This allows you to determine the size of the object and automatically determine the coordinates of its center.

To accomplish this, the invention has X, V coordinates registers 13, 14, in which the marker center coordinates are written, and marker symbol scale registers 15, 16 - horizontally. X, Y vertically. The device calculates. the address area in which the marker is located is along the horizontal X -, X +, vertical Y -, Y +. In the effective range of horizontal addresses, it is necessary to include a counter 6. for polling the memory unit 12, which functions as a symbol generator of the marker symbol horizontally, in the effective area of vertical addresses, it is necessary to include the address counter 7 for polling the memory unit 12 vertically. The intervals for switching on the counters 6,7 are determined by comparison blocks 4, 5, 17, 18, which compare the current data of the counters 6, 7 to the coordinate X +, Y + calculated in the adders and the data calculated in the subtractors 20,21, Y-YV2 .

Since the character format is fixed in serial character generators, for example, the character is located in the field of 8x8 elements, to receive the character on the CRT screen with horizontal and vertical adjustable sizes, scalers 10, 11 pulses are used in the devices. Shapers 10.11 is a constant memory device in which a series of tables for all values of a character size parameter are recorded. The meaning of the table is to reduce any X, Y format to a format, e.g., 8x8. Then it will be possible to use any serial character generator, and the size of the symbol on the CRT screen will be determined by the numbers X, Y. Here is an example of such a table for two values of X or Y (table):

As can be seen from the table, the output code varies from 000 to 111, i.e. within the format of 8x8 character generator. Thus, the shapers 10, 11 have two groups of inputs: a code input and an input of the current code of the address counter. The output of the block (2 memories are gated in element 19 AND by signals indicating the boundaries of the sections X.,. X + and Y - ... Y +. Counters 6 and 7 are also constructed with the same signals.

As a result, in this device it is possible to move the marker horizontally (code X) and vertically (code Y), set the size of the marker horizontally 5 (code X) and vertically (code Y), as well as change the type of marker, selecting the appropriate memory zone in the character generator.

A device for displaying a marker on a television indicator screen operates as follows. A clock generator (typically a crystal oscillator) is installed in synchronization unit 1, the frequency of which is determined by the number of information points on a single line of the image. The line frequency of the television scan is set by GOST - 15625 Hz, i.e. one-time interval (the string is 64 microseconds, of which about 50 microseconds remain in the forward stroke of the string.

0 If, for example, you place 256 information points on a line, then the frequency of the clock pulses will be f 256 / 50-10 6 5 MHz.

Next to the composition of block 1 synchronization

5, means for forming line and frame damping and clock pulses are included; counters and ROMs. Only 2 clock pulses are supplied to the counters 2, 3 of the X, Y coordinates

0 during the forward sweep, both row-wise and frame-wise. Counter 2 coordinates X counts the elements on a line (for example, from 0 to 255th), and counter 3 coordinates Y counts the line numbers.

5 In this case, each information point on the CRT screen has its discrete coordinates (X, Y).

Registers 13,14 coordinates X, Y set the coordinates of the center of the marker on

0 TV indicator screen. Codes of these coordinates (X, 9) are recorded from input 24 to registers 13, 14. Registers 15.16 contain the dimensions of the symbol (X, Y) and determine the sizes of the symbol field on the CRT screen

5 (FIG. 2). The coordinates of the extreme points of the field (X -, X +, Y -, Y +) are calculated: in the adders 22, 23 (Y +), (X +) and the subtractor x 20, 21 (Y -), (X -).

0 To obtain half the values from X, Y, a one-bit shift of the code is used at the inputs of adders 22, 23 and subtractors 20, 21.

The obtained four coordinate codes, points 5, 27, 28, 29, 30, Fig. 2 are constants, they can only be changed by applying new X, Y codes to input 24 or new X, Y codes to inputs 25. Dynamic codes are removed from counter 2 : the status of code X runs, for example, from 0 to 255 for

The main horizontal scan, the state of the Y code also runs its values during the forward horizontal scan.

Comparison of static and dynamic odes in comparators 4, 5, 17, 18 leads to the appearance of short mps at their outputs at moments Y Y + (block 4),; X + (block 5), Y Y - (block 17) | X (block 18). Since the counters, 3 coordinates work, starting with zero beginnings X, Y, then, obviously, the pulse at the output of the comparison block 17 / Y Y -) will be earlier than at the output of the block 4 of the equalization / Y Y +). The first of them releases the trigger 9 on the S-input, and the second - throws the trigger 9 on the R-input.

At trigger 9, a triangular-shaped impulse is generated corresponding to the rows from Y to Y + along the belt. Logically, on trigger 8, pulses of a rectangular shape are formed, corresponding in time to the numbers of the elements of the line from X - X / 2nd to X + X / 2nd.

The signals of the triggers 8, 9 form a time window during which a video marker signal is generated. The inverse outputs of triggers 8, 9, connected to the zeroing steps of R counters 6, 7, lock the count in these counters if logic 1 is on its outputs and enable counting with logical O. When triggers 8, 9 are turned on by S-inputs , then the corresponding counters start counting pulses: counter 7 counts the lower line damping (or selector) pulses from the second output of synchronization unit 1, and counter b - clock pulses from the third output of synchronization unit 1.

The number of pulses in the time window for counter 7 is obviously Y. For counter 6 it is X. Formers 10,11, as mentioned above, convert the X. .Y format to a format, for example, 8x8 for block 12, which performs the functions therefore, they have two groups of inputs: inputs of dynamic codes from outputs of counters 6, 7 and inputs of static codes from inputs 25 of the device; The memory unit 12, which performs the functions of the character generator, has three groups & Inputs: inputs of the vertical address of the symbol (from the output of the driver 11, inputs of the horizontal address of the symbol - from the output of the driver 10 (address of the symbol) from the input 27 of the symbol selection). The signal from the output of the memory unit 12 passes through the element And 19 and enters the video control; device only in the time window specified by triggers 8 and 9.

The operator’s work with the television indicator screen is as follows. When a distributed target appears on the screen, the operator imposes on

her marker so that the size of the marker was the same (horizontal and vertical) as the size of the target. To do this, the operator enters at the inputs 24 and 25 digital codes for marker position and marker symbol size.

How these digital codes are generated for this device does not matter, for example, the operator can manipulate two two-axis handles. After the target and the marker are completely combined, the coordinates of the center of the target can be determined from the X, Y values, and the target dimensions in two directions from the X, Y values, the symbol used for the marker determines the class of the target. Obviously, when using a conventional marker (for example, an image of a crosshair with constant sizes, the position of the center of the target is determined more subjectively.

Claims (1)

The claims A device for displaying a marker on a television indicator screen, comprising a synchronization unit, the first output of which is connected to the counting inputs X, Y coordinate counters, the outputs of which are connected to the first information inputs of the first and second comparison blocks, the second and third outputs of the synchronization block are connected to the clock inputs of the familiarity counters and lines, the installation inputs of which are connected to the reverse outputs of the first and second triggers, respectively, the outputs of the counters familiarity and strings connected to the control inputs of the first and second scale pulsers, the outputs of which are connected to the address inputs of the memory unit, the coordinate registers X, Y of the center of the marker, the information inputs of which are the first information input of the device, the scale registers in X and Y, the information inputs of which are are the second information input of the device, connected to the information inputs of the first and second pulse shapers, characterized in that. that, in order to simplify and improve the accuracy of the device, it contains a third and fourth comparison blocks, element AND, first and second subtracters. the first and second adders, the first information inputs of which are connected to the outputs, respectively, of the coordinate registers X, Y of the center of the marker connected to the first information inputs of the first and second subtracters, respectively, the second information input of the first adder is connected to the output of the scale register in Y connected to the second information input of the first subtracter, the output of the scale register in X is connected to the second information inputs of the second adder and subtracter, the outputs of the first and second adders are connected to the second information inputs of the first and second comparison blocks, the outputs of which are connected to the R-inputs of the first and second triggers, the S-inputs of which are connected to 0 the outputs of the third and fourth comparison blocks, respectively, the first information inputs of which are connected to the outputs of the X and Y coordinate counters, respectively, the second information inputs of the third and fourth comparison blocks are connected to the outputs of the first and second subtracters, the direct outputs of the first and second triggers are connected to the first and second inputs of the element And, the third input of which is connected to the output of the memory unit, the output of which is the output of the device for connecting to the video input of the television indicator torus. -T 16 T .. FIG. 2