SU798796A1 - Device for displaying information on crt screen - Google Patents

Description

The invention relates to automation and computer technology and can be used when constructing television devices for displaying graphic and sign information. A device for displaying graphical information on a CRT screen is known, comprising a serially connected interface unit, a control unit, a vector memory, a calculation unit connected via the first switchboard to two buffer blocks (swig registers), whose outputs through the second switchboard and the converter output signals of the buffer blocks to the video signal are connected to a CRT l. The disadvantages of the known device are the limitation of the total number of displayed vectors and the availability of high-speed vector memory, as well as the need to order the entire array of information. A device is known for picking up any sign information that contains successively podklyuchennyh symbol memory, register, symbol generator / and the control unit and the raster memory unit 2. A disadvantage of the known device is the low accuracy of placing the characters on the screen, which is determined by the size of the placemark. The closest in technical essence to the present invention is a device for displaying graphic information, comprising serially connected interface block, control block connected to the vector number memory block, to the vector formation block and to the shift register block, current value memory block, b The position coding block, the shift register blocks, the switch and the Gz indication unit. J The disadvantage of the device is its complexity, consisting in the presence of a large number of connections between the position block. coding and block registers and the difficulty of implementing these blocks, requiring significant hardware costs. The purpose of the invention is to simplify the device, increase its reliability by reducing the hardware cost of its blocks and reducing the number of

the connection between them and the expansion of the field of application of the device by means of two things to the reader, information and joint display of graphic and sign information placed on the screen with greater accuracy

The imaged target is achieved by TeMj, that the device containing the interface unit, the outputs of which are the inputs of the device, and the output is connected to the first input of the control unit, the second input of which is connected to the first output of the computing unit, two memory blocks interconnected with the block control, the output of the second memory block and the second output of the computing unit are connected to the first input of the third memory block, the second input, which is connected to the output of the control unit, and the output to the input of the computing unit, the third output of which is connected To the input of the positional coding block, the display unit, six vector generators, three switches, a color decoder and a symbol generation unit, whose inputs, except the first, and a color decoder input, are connected to the output of the computation unit, are entered, and the first blocking inputs and vector generators are connected to the output of the color decoder, the second, the inputs of the vector generators are connected to the output of the positional block. The third inputs are with the output of the control unit, and the outputs of every two vector generators are connected to the inputs of the respective switches, the outputs of which and the outputs of the character-forming unit are connected to the display unit, and also that each vector generator contains an exact value memory, inputs which are the inputs of the vector generator, and the outputs are connected to the inputs of the shift register, and the familiarity register, whose inputs are the inputs of the vector generator, and the output is combined with the output of the shift register and is the output ohm the vector generator, and the fact that the character-forming unit contains a character decoder whose input is the input of the unit and the outputs are connected; to inputs other than one character-generator, another input of which is the input of the unit, and the outputs are connected to the inputs except for one, the shift register, one more input of which is connected to the output of the form pulse shifter, the input of which is connected to the output of the converter, the time interval, the input of which. is a block input, and a color switch, the first input of which is connected to the output of the shift register, and the second input and outputs are the input and outputs of the block.

Figure 1 presents the block diagram of the device; figure 2 - graphically the operation of the vector generator.

It contains input buses 1, interface 2, control block 3, the first memory block 4 of the vectors and characters, the second memory block 5 of the number of vectors and characters, the third current value memory block 6, the computing unit 7, the decoder 8 colors, block 9 POSITION coding, block 10 of the formation of characters, inclusive de encoder 11 characters, character generator 12, shift register 13, driver

14 shift pulses converter

The 15-time interval, the switch 16 colors, six generators 17-22 vectors, each of which contains a block of 23 memory of exact values, shift register 24 and register 25 familiarity, three switches 26-28 and block 29 of the display.

The device works as follows.

Through the input buses 1 to the interface 2, information is recorded for displaying vectors and characters. . Interface unit 2 coordinates the rate of operation of the device and the communication line. The device has two modes of receiving information: Record and Erase. In the Record mode, the information from the interface 2 via the control block 3 is rewritten into the 4 memory block of vectors and characters, which stores and stores the information that should be displayed on the screen of the CELT. Block 4 of the memory of vectors and characters is a shift register covered by feedback.

The device is capable of displaying both graphic and symbolic information. Graphing

The images on the screen are produced from straight line segments (vectors). The vector setting is performed in various ways of representing the vector components. To display characters from the communication lines comes

 Information about the coordinates of the beginning of the sign, the sign code, the sign of the sign, the color code of the sign and the color code of the gender of the place of reference.

The components of the vectors and symbols are stored in block 4 and stored for the duration of the display, with the following: The origin coordinates (CA) of the vectors and symbols are not remembered. Coordinate U clearly corresponds to the address of the block 5 of the memory of the number of vectors and characters. When overwriting information into block 4 of vector memory and characters, the control unit 3 determines the number of vectors and characters whose origin coordinates (VL) belong to the same scan line, and is stored by the block

5 memories of the number of vectors and signs. If earlier, in block 4, information containing m vectors and characters beginning on the i-th scan line is recorded, then during the subsequent recording of K vectors and signs, found on the same line, the contents of the i-th cell of block 5 of the memory of the number of vectors and characters change to m + k.

The block width of 5 memories of the number of vectors and characters is determined by the following formula

(one)

P loq, n, where P is the width of the i-th cell of the memory unit; . the number of vectors and characters starting on the i-th scan line; i 1, 2, 3, ... 575.

For p = 128, the number of words in the memory block is 575 for the standard of television sweep in the USSR.

The information from block 5 of the memory of the number of vectors and symbols is converted and used to control the shift when overwriting the block of memory of current values.

The control unit 3 generates a series of shift pulses applied to 6jioK 4 vector and character memories. The number of shift pulses is equal to the total number of vectors and signs. Beginning on this scan line. If vectors and signs are not highlighted on this scan line, then HI, O and shift pulses are applied to block 4 e. In block 4 of the memory, the components of the rf character vectors circulate synchronously with the scan. In the case of using the standard line scan, information is provided for each field of the image frame. The period of information circulation in block 4 is 1/2 of the period of the vertical scanning frequency, i.e. period frequency fields. For the full period of information circulation in block 4 of the memory of vectors and signs, a constant number of shift pulses, ∆, is given to it. equal to the number of block words. During the circulation period, in block 3 of control, the total number of vectors and sign recorded in block 4 is counted, and if it is less than the maximum possible, an additional shift is made in block 4 during the flyback of the frame sweep. This additional shift synchronizes the operation of block 4 in such a way that by the beginning of the frame sweep at the output of its information, it relates to the first vector or sign having the minimum value of the AL.

In the Erase mode, information is memorized by the mate 2 block. Setting the input information is made, either, as in the Record mode, or by the number of a vector or a sign on the scan line. The Erase command is decoded, which corrects the value of the cells of memory block 5 of the number of vectors and characters. If previously in block 4 Ps1m ti of vectors and signs there were written ha of vectors and signs, and aciolts on the scan line, then upon subsequent erasing of K vectors and characters beginning on the same scan line, the contents of the i-th cell of the 5 memory block of the number of vectors and signs will change to m - K. Erasing the information in block 4 is performed by blocking

recycling its chain.

For further processing, information from block 4 is sent to the current value memory block by signals from control block 3.

Block b is intended for storing and storing the current values of vectors and characters for the horizontal scanning frequency period. Getting the current values of vectors and characters for

The next scan line is performed by block 7, the processing of which is again reminded by block b. In order to shift the information, in block 6 pulses are given with a constant period of circulation frequency. With

The absence of a display of a vector or sign on the next scan line blocks the current values from block 7 to block b. At the same time, according to the signal of block 7, block 3

control allows the transfer of information from block 4 to block b. The output signals from the computing unit 7 are simultaneously fed to the color decoder 8, to the positioning unit 9, and to the characters forming unit 10.

When displaying graphic information, the current values of the vectors from block 7 are transferred to block 9, which, using the codes for the beginning and end of the vector on the line, produces positional coding. At the output of block 9, a certain group of output tires is excited, in accordance with the input

codes. The principle of operation of the position coding block 9 in FIG. 2a The entire spacing of the line is divided conditionally into an familiarity by m

elements in each familiarity. Then

points on the line behind (2)

where X.J is the current coordinate of the point

on the line;

 the number of familiarity from the origin at the data point (a rough value of the position of the point); B.J - exact position value

Claims (3)

points inside familiarity. The length of the vector, given by the points of the beginning and end of it, is expressed as () + (VK-Vn). (D) where lX is the length of the vector on the scan line; Xj, X are the coordinates of the beginning and end of the vector on the line J A, familiarity, respectively, the beginning and end of the vector on the line, respectively.} Bz, B is the exact value of the coordinates of the beginning and end of the vector inside the familiarity on the line, respectively. From the formula (3) it can be seen that the vector on the scanning line is formed by setting the parameters m, B, - Bc. The function of converting the coordinate codes X and X into values is performed by block 9 of positional coding, the output signals from which are sent to blocks 17-22 of vector outputs, each of which contains an exact value memory block 23, shift register 24 and familiarity register 25 . Memorizing the exact values of B, B, respectively, at the addresses A, A, produces the exact memory block 23, and memorizing AKNAN - familiarity register (Fig. 26). The bit width of the memory block 23 is equal to m, and the number of its addresses is n. The bit of the register is 25 familiarity is n. Record of values Вц, В | for a vector of any length, it is produced in two cycles of operation: one for recording Bn, the other for B ,. At the same time, the values are written to register 25 with the viecT sign. Thus, unlike the known device, where it is necessary to record simultaneously into the mn register bits per cycle of operation, this display device, with an increase in recording time by 2 times, gives a significant gain in reducing hardware costs — when implementing block 9, position coding and reductions in the number of links between the latter and blocks 23 and 25. The recording of information into the exact value memory block 23 and familiarity register 25 is carried out in the presence of resolution signals from the color decoder 8 and from the control block 3, which estvl is alternately zag pis and reading in blocks 17-22. When reading information from block 3, it is written in parallel with the write code in shift register 24, the output signals from which are combined with familiarity register signals 25 and through the switch 26 are supplied to the cooler and the color channel of display unit 29 (FIG. 2d). The generators of the 17th and 1st vectors work alternately to write and read information depending on the scan line. If the current line of block 17 and 18 of the vector output is written and read, respectively, then the next line is read and write, respectively. When using the display unit 29 as a standard television monitor with three color channels: red, green and blue, for the display device to work, it is necessary to use six generators 17-22 vectors and three switches 26-28. When displaying the sign information on the character issuing unit 10, consisting of serially connected decoder 11 characters, character generator 12, shift register 13, driver of the shift pulses 14, driver code-time interval 15, and color switch 16, information is needed. The sign code on the decoder 11 characters on one of its output tires appears 7 signal. According to this signal, the character generator 12, in accordance with the line code received from the computing unit 7, produces a parallel code that decomposes the sign on the given scanning line. This code is recorded in the shift register 13 and stored there until a constant series of shift pulses are received from block 14. The time position of the series of shift pulses is determined by signals from the time conversion block 15, and the sign of the beginning of the Hz sign is fed to the input of KOToporOv. When the shift pulses arrive at the register 13, a serial code is removed from its output, which, through the color switch 16, is sent to the video signal input of the corresponding color channel of the display unit 29. The invention makes it possible to increase the reliability of the device by reducing the hardware costs for individual units and reducing the number of links between them, as well as expanding its area of application by color-coding information and jointly displaying graphic and sign information placed on the screen with greater accuracy. Claims. 1. A device for displaying information on a CRT screen containing an interface unit whose outputs are the inputs of the device, and the output is connected to the first input of the control unit, the second input of which is connected to the first output of the computational unit, two memory blocks, a single unit connected to the control unit, the output of the second memory block and the output of the computing unit are connected to the first input of the third memory block ti, the second input of which is connected to the output of the control unit, and the output - sd input of the computing unit, the third output of which is connected to the input of the positioning coding unit, the display unit, which, in order to simplify Expansion area In addition to the joint display of graphic and character information, six vector generators, three switches, a symbol generation unit, the first input of which and the first inputs of the vector generators are connected to the color decoder output, the remaining inputs of the character generation block and the color decoder input are connected to the output of the computing unit, the second inputs of the vector generators are connected to the output of the position coding block, the third inputs are connected to the output of the control unit, and the outputs of every two generators The vector vectors are connected to the inputs of the corresponding switches, the outputs of which and the outputs of the block of formation of signs are connected. to the display unit. 2. The device according to claim 1, wherein each vector generator contains an exact value memory block whose inputs are inputs of a vector generator, and outputs are connected to inputs of a shift register, and a familiarity register, inputs of which are inputs the vector generator, and the output is combined with the output of the shift register and is the output of the vector generator. A device according to Claims 1 and 2, of which iq, e e, so that the symbol generation unit contains a character decoder, the input of which is the input of the unit, the character generator, the first input of which is the input of the unit the other inputs are connected to the outputs of the character decoder, the shift register, one input of which is connected to the output of the shift pulse former. hectare and other inputs are connected to the outputs of the character generator, a code-time converter, the output of which is connected to the input of the shift pulse generator, and the input is the input of the unit, and the switch. the colors, the first input of which is associated with the output of the shift register, and the second input and the outputs are the input and output of the block. Sources of information taken into account in the examination 1, US Patent No. 3893075, cl. 340-324, .public. 1975. 0 2. USSR author's certificate number 465638, cl. G 06 K 25/20, publ. 1974. 3. USSR author's certificate 35 on application 2516083 / 18-24, cl. G 06 K 15/20, 13.12.78 (prototype). I) Pommnzvenm poS on zirana l offmu cmptwu rvz, and S) State of Re, Gist znomemest & 0 S} Fetal signals with register s98ig & d) Video signal from nonmutatvra 2ff