SU930355A1 - Graphic information output device - Google Patents

Description

(5) DEVICE FOR THE OUTPUT OF GRAPHIC INFORMATION

Claims (3)

The invention relates to computing and is intended to display graphic information. A device for displaying graphic information is known, comprising a computing unit; image framing units, a memory unit, a switching and reproducing unit of information connected in such a way that an indication of graphic black-and-white images D on the screen of the cathode-ray tube is provided. A disadvantage of this device is its complexity. The closest technical solution is a device for outputting graphical information comprising a memory unit connected to a modulation unit, a synchronization unit and a television indicator 2. A disadvantage of this device is a large hardware complexity. The purpose of the invention is to simplify the device. The goal is achieved by the fact that the device for outputting graphical information contains an address switch, a coordinate conversion unit, a decoder and a pulse distributor, the inputs of which are connected to the corresponding outputs of the synchronization unit and the coordinate converting unit, outputs with the corresponding inputs of the memory block, decoder, address switch and a modulation unit whose output is connected to the first input of the television indicator, the second input of which is connected to the corresponding output of the synchronous unit tion, the switch address inputs connected to respective outputs of the coordinate conversion unit and sync block output - with the corresponding input memory block, the decoder input is connected to the corresponding output block transformations of coordinates, outputs - to the corresponding inputs of the memory block. The coordinate conversion unit contains serially connected first register, first adder, second register and second adder, third register connected to another input of the second adder, trigger, reference unit, counter, the first input of which is connected to the trigger output and valve input, second input -c the output of the valve and the corresponding second turn of the second register, the output to the input of the comparison node, the output of which is connected to the first input of the trigger, the second input of which is connected to the corresponding input of the second register, the output of which th is connected to another input of the first adder "module insulating unit comprises first and second multiplexers, data inputs of which are connected respectively to the outputs of the fourth and fifth registers, the outputs from the OR gate inputs. Figure 1 presents the block diagram of the device; Fig. 2 J 3 are functional diagrams of the modulation unit and the coordinate conversion unit, respectively. The device comprises a memory block 1, a decoder 2, a modulation unit 3, a pulse distributor, a synchronization unit 5, an address switch 6, a television indicator 7, a coordinate conversion unit 8, a fourth register 9, a fifth register 10, the first multiplexer 11, the second mule type 12, the element OR 13, the first register 14, the third register 15, the comparison node 16, the trigger 17, the first adder 18, the counter 19, the valve 20, the second register 21 and the second adder 22. The device works as follows. The synchronization unit 5 generates pulses corresponding to the required screen rasterization of the television indicator 7 and control of the last scan. These pulses arrive at the pulse distributor, making it temporarily tied to the television clock signal. Information is read from memory 1 as follows. 8 of the readout mode according to the signal from the pulse distributor t, the address switch 6 connects the outputs of the synchronization unit 5 to the address inputs of the memory block 1, which produce the addresses of the readable cells from the memory block 1 Simultaneously, the pulse distributor t controls the writing and reading of information from memory block 1, forms a timing diagram of the read cycle. When all the above-mentioned signals are sent to block 1 of the memory, information is written from its output to the fourth and fifth registers 9 and 10 of the modulation unit 3. In one frame, the entire memory 1 of the memory 1 is read. In memory 1, each memory The point of the screen of the television indicator 7 corresponds to one bit, and the display of a point on the screen occurs when writing unit information into the corresponding bit of the memory block. Memory block 1 is organized in the form of N-bit words with the possibility of selective writing to any word bit that is selected when writing by decoder 2 according to the number of the required bit Np issued by the third register 15 of the coordinate conversion unit 8. The words read from memory 1 are alternately recorded in the fourth and fifth registers 9 and 10. The video signal is generated by sequentially polling the bits of the mentioned registers 9 and 10 by the first and second multiplexers 11 and 12. In the interrogation interval of the fourth register 9 in Fifth register 10 records the next word from memory block 1, and the multiplexer corresponding to the recordable register is blocked. After the end of the poll, the reverse procedure occurs — a word from memory block 1 is recorded in the fourth register 9, and the fifth register 10 is polled by the second multiplexer 12. The signals from the outputs of the multiplexers 11 and 12 pass through the OR element 13 and form a video signal that is fed to the input video amplifier of the television indicator 7. The graphic information in the Cartesian coordinates X and Y is fed to the input of the coordinate conversion unit 8, which converts the above coordinates recorded in the memory block of the point into ras rovoe representation, ie generates the address of the Net memory location and, however, measures the NP, to which the binary information should be written. The conversion is done according to the shape of the llamas. M (1 nau (Y cx - S) P - | -1, X-llr-fi Mp-vT i is the starting memory address from which the raster information begins to read; Y mcv has the maximum vertical coordinate of the image; P is the number of N- 1 L C is the whole part of the number A. The given formulas refer to the case of the origin of coordinates on the lower left corner of the screen. When entering the distributor I pulses h request to record the point and the sign of information it forms signals to control the coordinate conversion unit 8, switch 6 a The address, decoder 2, code Y is written in the first register 14 with the inverse output, and code X is written in the third register 15. Next, in the first adder 18, the addition and Y are done with the contents of the second register 21. The first sum and the second register 21 carry out multiplication (Mat. Y) on P. Counter 19 counts the P-pulses received through valve 20 from pulse distributor k and the impulses of writing to the second register 21. At the same time, counter code 19 compares with on node 16 comparisons with the value of P and if the latter equals generates a reset pulse in О the trigger 17, which sets the counter 19 in О and blocks the passage of pulses through the valve 20. The value U, P generated in this way, arrives at the first input of the second adder 22 At its second input, the code enters the third input J-. Thus, at the output of the second adder 22, the address number of the word is generated. The invention allows to achieve a simplification of the device due to the integration of the blocks and the elimination of redundancy in coding information. Claim 1. A device for outputting graphic information comprising a memory unit connected to a modulation unit, a synchronization unit and a television indicator, characterized in that, in order to simplify the device, it contains an address switch, a coordinate conversion unit, a decoder and a pulse distributor The inputs of which are connected to the corresponding outputs of the synchronization unit and the coordinate transformation unit, the outputs to the corresponding inputs of the memory unit, the decoder, the address switch and the modulation a locale whose output is connected to the first input of the television indicator, the second input of which is connected to the corresponding output of the synchronization unit, the inputs of the address switch are connected to the corresponding outputs of the coordinate conversion unit and the synchronization unit, the output to the corresponding input of the memory unit, the decoder input is connected to the corresponding output the coordinate conversion unit, the outputs to the corresponding inputs of the memory unit. 2. A device according to Claim 1, characterized in that the coordinate conversion unit comprises a first register, a first adder, a second register and a second adder, a third register connected to another input of the second adder, a trigger, a comparison node, a counter, the first input of which is connected to the trigger output and the input of the valve, the second input to the output of the valve and the corresponding input of the second register, the output to the input of the comparison node, the output of which is connected to the first input of the trigger, the second input of which is connected to the corresponding named after the second register, the output of which connected to another input of the first adder. 3. The device according to claim 1, about tl and may be the fact that the modulation unit contains the first and second multiplexers, the information inputs of which are connected to the outputs of the fourth and fifth, respectively registers, outputs - with the inputs of the element OR, Sources of information taken into account in the examination 1, USSR Author's Certificate N, cl. U06 K 15/20, 1977. 2. USSR Author's Certificate No. 38032, cl. Ci06 K 15/20, 197 (prototype). IT "one 6l. 7 : X. il Sb t H: .