SU656083A1 - Device for displaying information on crt screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION ON SCREEN OF ELECTRON BREAD TUBE

4 pixel generator, with ciTOM the second output of memory 2 through the second switch 7 is connected to the second input of the coding block 5, and the third output of the memory 2 through the pulse distributor 8 and the block of elements And 9 connected to the second inputs of the switches 3 and 7. The output of block B digital-to-analog converters through the driver of the television signal 10 is connected to the input of the cathode ray tube CRT 11 of the television receiver.

The proposed device works as follows.

Digital sync generator 1, operating in both autonomous and slave mode from synchronizing pulses (SI), produces not only standard sync pulses, but also digital sweep functions of the horizontal (CRHF) and vertical (CRRF) sampling.

The smaller bits of the CRP data can be used to form the elements of a television image, and the older ones - to create address commands for reading information from the memory block.

In turn, the storage unit 2 is a digital device for storing and reading pre-recorded information. The organization of block 2, in principle, does not differ from the organization of conventional RAM in alphanumeric displays x, i.e. It is also organized according to the address principle into sign rectangles, the number of which is equal to the number of 2 words written in the memory block.

However, each multi-bit word expressing the code of the generated image within the signed rectangle in memory block 2 is divided into 3 groups, each of which carries well-defined information.

The first group of bits expresses the type of image being formed (letters, numbers, graphic information elements, displacement figures, test images, etc.), the second group of bits expresses the nature of the color or brightness coding of the image formed within this sign rectangle. This includes the code of flashes, the code of the type of formed lines, etc. A third group of bits in a coded form expresses the address of the sensor of digital information.

Depending on the selected mode, the device can display static information recorded in the ROM, or information with limited dynamics and controlled coding. In the latter case, control is exercised from the sensors.

Consider an example of displaying static information. At the same time, signals from the sensors are not fed to the block of elements 9. The code combinations expressing the type of image being formed from the first output of the memory block 2 pass through the first switch 3 without changing and are fed to the pixel generator 4. Depending on the incoming code The image element generator 4 synthesizes one image or another. With

This to the second input of this generator is fed to the lower bits of the horizontal and vertical sampling CRR, taken from the corresponding outputs of the clock generator 1.

In turn, the second group of bits

from the output of block 2, carrying information about the coding character of the signals, having passed through the second switch 7 without changing, is fed to block 5. In this block, the pixel signals are subjected to conversion, as a result of which the video signal of the generated image is subjected to a certain transcoding. To implement, for example, color-coded, saturated chroma, the separation of the generated signal into coded

the color signals R, G, and B are implemented using 3 type 2 logical cells. To provide color and luminance coding, the number of logical cells in each of the R, G, and B channels is determined by

selected number of gradations.

A block of digital-to-analog converters 6 serves to finally shape the analogue chrominance signals, which are then fed to a television signal shaper 10. The output of the shaper 10 forms a complete color television signal suitable for supplying a television receiver CRT 11. When displaying information with limited dynamics and controlled coding from the memory cells of the ROM, the information expressing the sensor address (the third output of block 2) is fed to the pulse distributor 8. The pulse distributor 8 can be made in the form of a binary decoder, at the output of which a code is generated from N, where N is the maximum possible number of sensors. The outputs of the pulse distributor 8 is connected to the corresponding groups of the block of elements And 9. The second inputs of the block of elements And 9 give binary signals from the sensors

signals. At the same time, each sensor corresponds to a well-defined group of logical cells of the AND 9 block of units, at the outputs of which a parallel code is formed, expressing a new type of generated image, or a character of color or brightness coding. In the first case, this code is fed to the first switch 3, and in the second case to the second switch 7.

The switches 3 and 7 are designed in such a way that, when signals from sensors are present, signals from the outputs of memory 2 are prohibited, i.e. signals from sensors have priority over signals from memory 2. The remaining blocks operate in Information display with limited dynamics and controllable coding is no different from that described earlier.

Consider some specific examples. Suppose, for definiteness, when displaying information in the form of a complex mnemonic scheme recorded in ROM, some of its elements must change their appearance (switches, indexes, etc.) and color. To this end, in the cells of the ROM of these elements, it is necessary to record the codes of the formed elements and their color coding in accordance with the requirements for the type and color of these elements in the absence of signals from the sensors.

In order to implement limited dynamics and control color coding, a binary code is written in the third group of bits in each cell of memory 2, expressing the code (address) of the sensor of varying information. So, for example, if the given code is represented by the binary vector 1001, then at the output of the distributor 8, as a result of decoding this code combination, the impulse m reads the information from the sensor, to which the 9th sequence number is assigned. If the controllable element is located on the same familiarity (switch image), then the code combination is recorded in one memory cell. If the controlled element is located on the familiarity group (the image of the broken line of the mnemonic circuit), then, naturally, the code combination expressing the address of the control sensor is recorded in all cells of this group.

Text labels consisting of a set of controlled characters in the proposed device are formed by extremely simple means. At the same time, an "internal familiarity switch" is used. So, for example, to display information about the exact time on a TV screen consisting of four characters (ten and one hours, ten and one minutes), you must select four columns Rkt {; , , at

which enter arbitrary addresses of sensors. Each of these addresses in the manner described above is given a one-to-one correspondence with the code read from the four time counters. If binary

The Q code generated by the time counters corresponds to the lower digits of the digit code that is stored in the image elements (characters) 4 in the generator, then the image synthesis of the exact time will be provided automatically.

The use of new elements and the connections between them favorably marks the proposed device from the indicated prototype, as it allows to expand the area

0 application and simplify its design.

Claims (2)

1. Guglin I. N. Formation of signs on television indicators. M., “Energie, 1974, p. 36-45. 2. USSR author's certificate number 488236, cl. G 06 K 15/20, 1972. ntsom