SU1624434A1 - Device for displaying data on the screen of a cathode-ray tube - Google Patents

Abstract

The invention relates to automation and computing and can be used to display graphic information in measuring devices, control systems, control and data processing. The aim of the invention is to expand the scope of application due to the possibility of displaying arbitrary waveforms. The device comprises a pulse generator 1, a counter of 2 points, a switch 3, a RAM block 4, a comparison block 5, a horizontal scanning generator 6, a 7 line counter, a video signal forming device 8, a CRT 9, a frame scanning generator 10 with corresponding links. The curve codes are read in block 5 comparison with the current address of the line. This allows multiple points to be displayed on a single line and, therefore, to display arbitrary waveforms. 1 il.

Description

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The invention relates to automation and computing and can be used to display graphic information in measuring devices, control systems, control and data processing.

The aim of the invention is to expand the scope of application due to the possibility of displaying arbitrary waveforms.

The drawing shows a block diagram of the proposed device.

The device contains a generator 1, pulses, a counter of 2 points, a switch 3, a memory block 4, a comparison block 5, a horizontal sweep generator 6, a 7 line counter, a video signal forming device 8, a cathode ray tube (CRT) 9, a frame generator 10 sweep.

The device works as follows.

To display a curve, the sequence of its codes, for example, after an analog-to-digital converter (ADC), must be loaded through the information input of the device into the main memory block 4. The loading is carried out external to the proposed device (for example, a microprocessor system). To do this, the external device sequentially places the addresses of the memory memory of the 4th RAM memory unit at the address input of the proposed device. At the same time, the corresponding data (curve codes) are placed with the specified addresses on the information input of the device. Recording is gated. the appearance of a signal at the information recording control input to the device, which is fed to the control inputs of the switch 3 and the RAM block 4. Under the action of this signal, the switch 3 connects its first input to the output. Therefore, the address from the address input of the device goes directly to the address input of the 4 RAM. The entire sequence of curve codes is recorded in the same way.

When displaying information on the screen of a CRT, the pulse generator 1 generates rectangular pulses with a tracking frequency F. The clock pulses arrive at a counter of 2 points with a conversion factor of N. Therefore, the binary code at the outputs of the group of counter 2 changes cyclically from O to N-1 and is point code in the line, so wounded by the number of points in the line, along which a given moment of time passes the electron beam on a CRT screen. At the output, counter 2 produces rectangular pulses with the next frequency F / N, which start generator 6 and arrive at the input of the counter 7 lines. The binary code of the point through the switch 3 is fed to the address input of the main memory unit 4, which operates in the read mode of stored codes. Consequently, at the output of block 4, there is a sequence of codes of the recorded curve (oscillograms, graphs, etc.).

The counter of 7 lines has a conversion factor equal to M. Therefore, at its output, square-wave pulses are produced, whose frequency is equal to

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starting the generator 10. At the outputs of the group of the counter of 7 lines, the binary code of the line number is generated, which changes cyclically from 0 to M-1. Thus, the binary inputs of the curve readings arrive at the first input of block B, and the binary code of the line number arrives at the second input. With each code of the line number, the beam moves along the line from one edge of the image to the other and successively, one after the other from the RAM block 4, all codes (samples) of the displayed curve are output. At the moment of equality of the codes at the inputs, block 5 generates a pulse of the light curve, which enters the video signal shaper 8.

Claims (1)

Thus, the proposed device, unlike the prototype, allows displaying several dots in one line and, therefore, displaying signals of arbitrary form. A device for displaying information on the screen of a cathode ray tube containing a point counter, a row counter, a switch, a memory unit, a comparison unit, a horizontal scanning generator, a video signal conditioner, a vertical scanning generator, a pulse generator, the output of which is connected to a point counter synchronization input, the overflow output of which is connected to a horizontal scanning generator input and a row counter synchronizing input, the overflow output of which is connected to the input of a vertical scanning generator, the output of which and the horizontal scanning generator output are connected to a deflection system of a cathode ray tube whose modulator is connected to the output of the video signal maker, the input of which is connected to the output of the comparator unit, the first information input of which is connected to the output of the random access memory unit, the address input The one which is connected to the switch output, the first information input of which is the address input of the device, the information input of the RAM block is the information input of the device, the control input of the switch is connected to the control input of the RAM block and is the control input of the device, characterized in that, in order to expand the field of application of the device due to the possibility of displaying arbitrary waveforms, the outputs of the point counter are connected to the second information input mutator, the outputs of the row counter are connected to the second information input of the comparison block.