SU813496A1 - Information display - Google Patents

Description

The invention relates to automation and computing and can be used in devices for displaying information on cathode ray tubes. A device containing converters, X, ..., VO, digit-voltage sensors for XQ, X VO summing amplifiers X, Y modulator, is known; display unit, subtraction unit, vector length calculator, linearly increasing voltage generator Cl Also known is a device containing registers of the X and Y coordinates, digital analog converters, a low frequency filter, modulus of gage The closest to the proposed device for displaying information device containing the X and Y coordinate registers, digital-to-analogue transducers / deflecting coils of the electric tubercle tube, passive memory device, digital-to-analogue modulation converter, view Amplifier p}. A common drawback of these devices is their limited range of application, since they make it difficult to reproduce the dashed and dash-dotted contours of the image. The purpose of the invention is the expansion of ob-. The field of application of the device by reproducing on the screen of the cathode-ray tube dashed and dash-dotted image contours. The goal is achieved by having a serially connected second memory unit, the first input of which is the device input, and a pulse-width modulator containing the serially connected counter, decoder and encoder, the second and third encoder inputs, and the input of the counter, are connected to the device, respectively the first, second and third inputs of the pulse-width modulator, and the encoder is connected to the output of the modulator, the second input of the modulator is connected to the character generator, the third input to the first control unit and a second input of the second memory unit, the output of the modulator is connected to the input of video amplifier. The drawing shows a block diagram of the device. The device contains the first control unit 1, the first memory unit, the image memory unit 2, the character generator 3, the second control unit, the beam deflection control unit 4, the video amplifier 5, the electron-receiving tube 6, the second memory unit — a circuit type memory unit 7, pulse modulator 8 of the line type, which includes a counter of 9 segments, a decoder of 10 segments and an encoder 11 | of a group of segments.

The device works as follows.

From the input information bus 12, the command codes go to the first control unit 1, which performs the inter-synchronous operation of the remaining units of the device, and the data codes to the blocks 2 and 7 of the image memory and the contour type. Codes of reproduced images (symbols, symbols, vectors) are recorded in block 2 of image memory, in block 7 of memory of contour type 7, codes of type of reproduced image contour (solid dashed, dash-dotted).

The codes of the reproduced images from the output of the image storage unit 2, the output of which is connected to the output information bus 13, are fed to the input of the character generator 3, which is the beam deflection control unit 4 that performs the required movement of the beam through the screen of the electron beam tube 6 to reproduce the image contour.

The line type code from the output of the contour type memory block 7 is fed to a pulse width modulator 8 line type, to the second input of which a 3-pulse is output from the character generator 3, the duration of which is equal to the duration of the reproduction of the contour of the corresponding image from the set of images in the frame. Also, the pulse-width modulator of the line type 8 is clocked by the control unit 1.

In accordance with the line type code, the pulse-width modulator 8 converts the input wide pulse into a sequence of groups of pulses, and within the group the pulses differ both in duration (width) and in the duration of the pause between pulses. This sequence of groups of pulses through video amplifier 5 is fed to a modulator of a cathode-ray tube. B. The image contour reproduced on the screen of the electron-beam tube is illuminated in accordance with the sequence of groups of modulating pulses, which determines the type of reproduced contour-continuous or dashed with different lengths of strokes and different distances between strokes, or dash-dotted with different lengths of strokes and dotted lines, and the distances between strokes and dotted lines.

The pulse-width modulator 8 includes a serially connected counter of 9 segments, a decoder of 10 segments and an encoder of 11 groups of segments ..

Counter 9 segments, connected to the output of control unit 1, receive counting pulses with a period equal to the playback time of the minimum dashed segment or dotted line of the dashed or dash-dotted contour on the screen of the cathode ray tube 6. The decoder 10 segment decrypts a sequence of various combinations of states of the counter 9 segments. The encoder 11 of the group of segments in accordance with the line type code from the output of the memory block 7 of the combining circuit type is the necessary sequence of combinations of states from the output of the decoder of the 10 segment. The duration of the sequence specified is determined by the duration of the reproduction pulse of the image contour from the output of the character generator 3. The output of the encoder of the group of segments is connected to the output of the line width modulator ,.

Claims (3)

1. US Patent 3,725,897, Cl. G About F 3/14, published. 1973. 2. For Japan No. 51-17260, cl. G 06 F 3/14, published. 1976. 3. US patent number 3976991, cl. G About F 3/14, published. 1976 (prototype). W eleven