SU748467A1 - Information display - Google Patents

Description

The invention relates to automation and computing and is intended to build a display device information on the screens of electronic devices. A device for displaying graphical information on a screen of a cathode ray tube is known, which contains receiver registers, reversible counters X and Y connected through digital-to-analogue converters to deflection coils of a CRT, a pulse generator, a frequency divider, a block zero, a valve and a switch. The disadvantage of this device is its narrow functionality. The closest to the proposed device in terms of technical sums is a visual information display system comprising a computer interface unit, a buffer memory, a control unit, a symbol generator, a circle generator, a vector generator, a symbol sweep generator, X counters and Y, arithmetic unit, illumination modulator, digital-to-analogue converters, the outputs of which through amplifiers are connected to a CRT deflection system. The device has wide functionality - allows you to display on the screen of the same indicator alphanumeric information, vectors (line segments) and a circle or circular arc 2.. The disadvantage of this device is the low accuracy of the information display. The purpose of the invention is to improve the accuracy of the device. This goal is achieved by the fact that a device containing an interface unit whose input is input to the device and the first output is connected to the first input of the control unit, the first output of which is connected to the first input of the memory unit, the second input of which is connected to the second output of the unit sopr -

and output with over-inputs of the geerator of symbols, vector generator, generator of circular arcs and arithmetic unit, the second, third and fourth passages of which are connected to the first code of the generator, scan of symbols, vector generator and generator of circular arcs, the second output of which is connected to the second the control unit input, the second, third, fourth and fifth output of which are connected respectively to the second inputs of the symbol generator, vector generator, circular arc generator and to the first ax for the symbol scanner, the second code of which is connected to the third input of the control unit, the fourth input of which is connected to the second output of the vector generator, the third input of which is connected to the first input of the luminance modulation unit, the second and third inputs of which are connected respectively to the third arc generator output circles and to the first output of the symbol generator, the second output of which is connected to the second input of the symbol sweep generator, the third output of which is connected to the third input of the symbol generator, t This output is connected to the first input of the block indicacins, the second and third inputs of which are connected to the outputs of the brightness modulation unit and the arithmetic unit, the fifth input of which is connected to the sixth output of the control unit, contains a diffraction converter, a register, a switch and an OR element, the first and the second inputs of which are connected to the fourth inputs of the circular arc generator and the vector generator, and the elemeng OR output is connected to the first input, K (emutat, the second and third passages of which are connected to ervymi outputs respectively of the generator and the generator vectors circular arcs, and the switch output is connected to an input register, whose output is connected to the input of the digital to analog converter whose output is connected to fourth input of the indication unit.

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The drawing shows a block diagram

devices.

The device contains a block of 1 interface, block 2 of control, block 3 of memory, generator of 4 symbols, hexerrator 5 sweep of symbols, generator of 6 vectors, generator of 7 arcs of circles, element 8 OR, switch 9, block 1O mod | qi, arithmetic block 11, register

12, a digital-to-analog converter 13, block 14 HirnHKauHR, channel 15 of communication with a source of information.

Interface unit 1 includes a signal exchange circuit for readiness to receive information transfer, a register, and an information control circuit.

The display unit 14 includes digital-to-analog converters X and Y, amplifiers of sign and coordinate deflection systems of CRT.

The device works as follows.

The interface unit 11 exchanges the alarm with the source of information, monitors the incoming information and records it in memory block 3 at the addresses generated by control unit 2. After the reception of information on the signals of the control unit 2 is completed, the reading from the memory block 3 and the input of the information into the corresponding blocks

The coordinate codes of the reference points (locations of objects) are entered directly into the arithmetic unit 11, then these codes enter the display unit 14, where they are converted into CRT beam deflection signals, on the screen of which a point will be displayed. If a vector and a multi-character formula are to be displayed next to a dot, then the work is carried out in the following order.

After entering into the arithmetic unit 11 the coordinate codes of the reference point with & which is the delay necessary to complete the transfer of processes in the deflecting system of the CRT, the control unit 2 outputs to the vector generator 6 a pulse for activating it. According to the signals of the control unit 2, codes of vector projections on the coordinate axes are entered into the vector generator b. According to these codes, the generator of 6 vectors generates codes for the increments of the coordinates X and. Y, which pass through the group of elements OR in the arithmetic unit 11, are summed (or subtracted) and in the display unit 14 are converted into the corresponding signals of a CRT beam deflection. At the same time, a signal is output from the generator of 6 vectors to the modulation unit 10, allowing the generation by the modulator 10 unit of the beam illumination signal. A vector is displayed on the CRT screen. According to the vector end signal, control unit 2 reads from memory block 3 and inserts 4 5-74846 characters of the first data symbol into the generator:; Bohr | ul, The 4 character generator generates signals for the CRT beam to pass along the contour of the symbol. These signals come in a 5-digit deflecting (not shown) display unit 14. At the same time, signals are output to the modulation unit 10 permitting the illumination of the beam. According to the signal of the end of the symbol, the generator 5 to sweep the characters generates the address of the source point of the next formula symbol (coordinate increment codes X and Y) and, in control unit 2, issues a read request signal from block 3 of the code 15 memory of the next symbol. In the arithmetic unit 11, summation codes of the coordinate increments are made (in the display unit 14) Conversion i to the analog signals of the deflection of the CRT beam. With some delay required to terminate the transient processes in the deflecting system, from the symbol sweep generator 5 to the 4-symbol generator a permission signal is drawn to draw the next 25 characters. The described process of the operation of the product is from - until the end of the display of the last character of this formula. In this case, the control unit 2 introduces into block 1 a signal that receives the day of the source of the information of the new message. If a line is reported to the device input that the reference point coordinate codes are first entered into the arithmetic unit, after the transients are completed, the control unit 2 reads the projection codes of the first line segment from the memory block 3 and enters the x vector generator 6 . In the same way as described, the first line segment is displayed, then the 6 projection code vectors of the second line segment are entered into the generator, etc. until the end of the display

which segment of the line.

In the case when a message about a circular arc is received, coordinate codes of the initial point are entered into the arithmetic unit 11, and the radius code and the codes of the source and end point numbers are entered into the 7 circular arc generator (the circle is meadows with the numbers of the initial and final points ).

Generator 7 (arcs of circles plunder coordinate increment codes to draw chords on the CRT screen that approximate arcs of circles. These

the angle of inclination of the line proportionally increased (decreased) pedestal size U j. This condition in the proposed device is fulfilled, since the amplitudes of the pedestals are formed in accordance with the increment codes. Each slope of the line corresponds to its own pedestals, which, in accordance with the formula given, will allow5pot to achieve linearity of the display of graphic information,

Claims (1)

Invention Formula A device for displaying information containing the interface unit, input 76 codes are summed (subtracted) in the arithmetic unit 11 and fed to the display unit 14 for conversion and display on the CRT screen. At the same time, a signal is transmitted to the modulation unit 10 from the generator of arcs of the circles, which enables the illumination of the CRT beam. At the moment of the end of the arc display in control block 2, the end of work signal is over, which begins to receive a new message. come from the output of element 8 OR, which controls the corresponding m generator. In register 12, incremental coordinate codes are stored for the time required to display this increment, i.e. until the appearance of the codes of the next prigoceny. Codes stored by register 12 are converted by a digital-to-analog converter 13 to voltage levels (pedestals). The pedestals are fed to the second inputs of the summation amplifiers (not shown) of the display unit 14. The proposed device in comparison with the known, provides increased accuracy of the displayed information. In the source, in order to obtain a linearly varying current in the deflecting coil, it is necessary to satisfy the condition UL where and, is the voltage across the inductance proportional to the rate of change of current; ip-ol is a coefficient characterizing the rate of current growth; t is the time constant of the circuit. Due to the fact that the value of Tg for a given circuit is constant, in order to maintain a constant ratio, it is necessary that with increasing (decreasing)