SU905849A1 - Graphic information displaying device - Google Patents

Description

() DEVICE FOR GRAPHIC DISPLAY The invention relates to automation and computing technology and may be used in the construction of a device for displaying functional dependencies. Television devices for displaying graphical information are known, in which positional point coding and image coding 1 are used. However, in devices that implement the positional coding method, a large volume of memory (-.) Is used, which, when playing back simple patterns, leads to its significant clarity. When coding by familiarity, the image is formed from a limited set of separate fragments. This reduces the functionality of the device and the image quality. Very often, all graphic information is deliberately limited to functional dependencies INFORMATION. Accepting their updating (for example, in experimental studies) can be carried out at sufficiently high speeds. The use in such cases of the devices discussed above, in addition to the already mentioned drawbacks, also encounters their relatively poor dynamic characteristics. They are associated both with the difficulties of converting the code of graphs usually received in computers into codes used in display devices, and with the difficulties of transforming the arrays themselves into these memories ;; devices when changing the picture. The closest to the present invention is a device for displaying functional dependencies comprising a coding unit and a vertical position marker counter, the first input of which is connected to the first input of the display unit and the output of a synchronous generator connected to the master oscillator. The illumination signal is generated using a vertical position counter and a coding block, including a serially connected memory block, a comparison circuit, and a logic block. The device has a small memory with a convenient form of representing curves as a sequence of ordinates 2.

However, in a certain part of the screen, it is able to reproduce only one graph. Outputting several curves simultaneously is possible only due to duplication of such devices, which leads to a rapid increase in the volume of equipment.

 invention - expanding the scope of the device by increasing the number of displayed curves

This goal is achieved in that the device containing the coding blocks and the counter of vertical labels, the first input of which is connected to the first input of the display unit and the output of the synchronizer connected to the master oscillator, includes a frequency divider, a decoder, a buffer memory block, a switch and two OR elements, the frequency splitter inputs being connected to the outputs of the synchronizer and the generator, and the output connected to the first inputs of the coding units, with the second input of the label of the vertical tag. And, with the input of the decoder, the output of which is connected to the control inputs of the buffer memory block and the switch, the output-counter of the vertical position labels is connected to the second inputs of the coding blocks whose outputs through the first OR element are connected to the information input of the switch, the first output of which connected to the information input of the buffer storage unit, the output of which and the second output of the switch are connected via the second element OR to the second input of the display unit.

The introduction of these blocks allows an increase in the number of output curves due to a more complete use of line-scan time. During the horizontal scanning period, each coding unit forms lines for decomposing several, for example, two curves, we take one of them is reproduced directly in the process of formation, and the other - by codes from the buffer memory block, where it is recorded during the reverse path of the beam and unused to reproduce sections of the forward course. FIG. 1 is a block diagram

devices; in fig. 2 - time characteristics of his work.

The device contains coding blocks 1, each of which includes series-connected blocks

the memory, the comparison circuit and the logic block. The input of the memory block is the first input of the coding block 1, the second input of the comparison circuit is the second input of the coding block 1, and

the output of the logic block is the output of coding block 1. The first input of the vertical position marker 2 is connected to the first input of the display unit 3 AND to the output of the synchronous generator connected to the master oscillator 5. The period of its oscillations determines the duration of the image element. Frequency divider 6 is connected to master oscillator 5 and synchronization generator 7. Output of frequency divider b is connected to input of decoder 7, as well as to the first inputs of coding blocks 1 and to the second input of the counter of vertical labels

position 2, the output of which is connected to the second inputs of coding block 1. The output of decoder 7 is connected to the control inputs of the block of buffer memory 8 and switch 9. The volume of block 8 of buffer memory, which may be, for example, a shift register, corresponds to single line decomposition. The outputs of the coder unit 1 through the first element 10 IL1 are connected to the information input of the switch 9, the first output connected to the information input of the block 8 of the buffer memory. Its output and the second switch 9 through the second element 11 OR are connected to the second input of the display unit 3.

The device works as follows.

For the horizontal sweep period / Tj. each coding block 1 sequentially forms n separate decomposition lines for n curves. Figure 2 shows the temporal characteristics, for example, for the case of forming three curves (). Here are two

Claims (2)

TV lines N and N + 1. The intervals (c-t) and (tj - ti) correspond to the visible parts of the rows, (t,) - the reverse course of the beam. One cycle of the device operation takes an interval (,, equal to T,. During this time, the coding unit 1 generates decomposition strings that are reproduced on the (N + 1) cTpole of the sweep. The expansion strings are generated in the (-), (6 - a), and (e - e), the duration of each of which is equal to US / C. Accordingly, n arrays of arrays describing n curves are stored in the memory block. During the first interval (Gj-c), the first array is interrogated. The polling is done at the element frequency. The ordinate sequence from the block The memory is compared in the comparison circuit with the number of the current TV line (N + 1), which is formed by the counter of vertical position labels 2. According to the results of the comparison, the logic block produces the backlight signals, which together form the line code of the first curve. (.-B a) interrogates the next array in the memory block and forms the decomposition string of the second curve. Thus, all the matrices will be interrogated for Tr and the decomposition lines for the n curves are formed. Since the decomposition lines are formed sequentially, they are temporarily stored in block 8 of the buffer memory for reproduction in one common area of the screen. In the interval (o, –b), the codes of the first decomposition line from the output of coding block 1 through the first element 10 OR and switch 9 enter the previously cleared block .8 of the buffer memory. In the interval (|) 2, the codes of the next line of decomposition also enter block 8 of the buffer memory and overlap the previous record according to the law of logical addition. In general, this process is repeated in all other intervals of the cycle, except the last. As a result, in block 8 of the buffer memory, one common decomposition line is formed. In the last cycle interval (a., - 6-1), which is completely located on the visible part of the television line, for example, at its center, the buffer memory block 8 is set to read state and switch 9 switches the output of element 10 OR from the information input block 8 of the buffer memory to the input element 11 OR. As a result, at time a, the codes of the last decomposition line from coding unit 1 and the codes from buffer storage unit 8 at the same time through element 11 OR begin to flow to display unit 3, where one common decomposition line is played. In order to obtain an undistorted image, a buffer memory block 8 is typed at the rate of code generation in encoding unit 1. At time G, the playback process ends and a new cycle of operation of the device begins. At this moment, the buffer storage unit 8 is set to the recording mode, the switch switches the output of the element 10 OR to the information input of the buffer storage unit 8, and the label of the vertical position labels 2 Generates the next TV line number (N + 2). The operation of the device is clocked by the signals of the synchronous generator and frequency divider 6. The synchronous generator C, which can be built according to any known scheme, performs the formation of a television raster in block 3 and assigns the device operation to it. Directly the operation of the device controls the frequency divider 6. To ensure stable operation, bots. The clock generator and frequency divider 6 is triggered by a common reference generator 5, the oscillation period of which determines the duration of the image element. Frequency divider 6 is a counter, the conversion factor of which allows the TC to be divided into n equal intervals with a given number of elements in each of them. The signals of frequency divider 6 interrogate the memory unit and start up the vertical position counter 2. The operation of block 8 of the buffer memory and switch 9 is controlled by a decoder 7, which, using the codes of frequency divider 6, generates a signal that coincides with the last generation interval in the cycle (a - S2). The required position of the image field on the screen is ensured by periodically setting frequency divider 6 and the label of the vertical position 2 to a certain initial state with horizontal and frame synchronization signals. As the number of curves generated by encoding unit 1 increases, the length of the decomposition lines decreases rapidly. This leads to image compression and increases the cp performance requirements. Practical interest therefore represents the case when encoding unit 1 forms two curves. In this case, the image occupies most of the screen, and the circuit solutions are the simplest. An apparatus for displaying graphic information comprising coding units and a vertical position counter, the first input of which is connected to the first input of the display unit and to the output of a synchronous generator connected to a master oscillator, in order to expand the field of application of the device by increasing the number of displayed curves, it contains a frequency divider, a decrypted block of buffer memory, a switch and two OR elements, with the inputs of the frequency divider connected to the outputs (98 sync generator and master oscillator, and the output is connected to the first inputs of the coding units, to the second input of the vertical position label counter and to the input of the decoder, the output of which is connected to the control inputs of the buffer memory block and switch, to the output of the vertical position label counter to the second inputs coding units whose outputs through the first OR element are connected to the information input of the switch, the first output of which is connected to the information input of the buffer memory block, the output of which and v The switch output through the second element OR is connected to the second input of the display unit. Sources of information taken into account in the examination 1. Soloveychik I. Ye., Drabkin R. I., Yarmarkin K., K. Electronic information display devices in automated communication systems. M., Holy Hour 1973, p. 89. 2. US patent number 363662, cl. G 06 F 3/1, publ. 1972 (prototype). g / / V iJi.2