SU1265756A1 - Device for information output from screen of cathode-ray tube - Google Patents

Abstract

The invention relates to the field of computer technology, in particular, to devices for displaying and displaying graphical information, and can be used to study various structures in biology, medicine and industry. The purpose of the invention is to increase the accuracy of the device, which is achieved by introducing a mixer 8 of signals and a comparator 7 and the corresponding functional connections. 3 il. (L

Description

The invention relates to computing the output and display of graphical information, and can be used to study various structures in biology, medicine, and industry. The purpose of the invention is to improve the accuracy of the device. Fig, 1 shows the structural diagram of the proposed device; in fig. 2 - control unit; on fig.Z - time diagram. The device contains a video monitoring unit 1, made on an electron beam tube (CRT), television sensor 2, light pen 3, phototransducer 4, counter 5, register 6, comparator 7, mixer 8 signals, control unit 9 and unit 10 of control unit 9 contains the generator of 11 commands, the counter 12 of the address and the register of the 13th. The command generator 11 is, for example, a multivibrator with a pulse distributor, synchronized by the horizontal sync pulses from television sensor 2, and issues successively the Count, Record commands to the memory block 10, and the +1 Adr command to the counter 12 addresses and increasing the address code by one. From the output of the address 12 counter, the address code enters memory block 10. The number register 13 serves for temporary storage of information read and written to memory block 10. The device operates as follows. The input information via the television sensor 2 and the signal mixer 8 is fed to the video monitoring unit 1 and displayed on the CRT screen as an image. At the same time, the television sensor 2 generates frame and line sync pulses, which serve to synchronize the entire device. The memory block 10 is interrogated by the block, 9 controlling synchronously with the movement of the electron beam of the CRT of block 1. Each point of the CRT screen corresponds to a cell in memory block 10 which is used to record the coordinates of the points of the light pen 3. The latter is located at some point of the screen of the CRT of block 1 and at the output of the photoconverter 4, the detector 4 produces impulses when the scanning beam passes through the aperture of the light pen 3. In connection with the final dimensions of the aperture, the scattering of light on the wall of the CRT of the kinescope and the details of the light pen 3, at the output of the photoconverter 4 n There is not a single pulse, but a packet, and the number of pulses in the packet depends on the type of photodetector of the photovoltage converter 4 and the brightness of the section of the kinescope on which the pen is located. The true coordinates of the light pen correspond to the pulse located in the center of the stack. Counter 5 counts the number of pulses in the packet coming from the photoconverter 4. At the end of each frame, the contents of all bits, except the low counter 5, are rewritten into register 6, i.e. the number. stored in the counter is divided in half and rewritten into register 6, after which counter 5 is reset to zero. In the next frame, counter 5 starts counting the number of pulses in the next pack of the light pen, and as soon as the middle of the pack is reached, the codes of counter 5 and register 6 are matched, and a pulse appears at the output of comparator 7, which represents the coordinates of the position of the light pen. This impulse is recorded through control unit 9 into memory unit 10, the interrogation of the cells of which is conducted synchronously with the movement of the television sweep beam. Thus, the address to which the signal from the output of the comparator 7 was recorded is equal to the address of the location of the light bearer. The pulse read from memory block 10 through control block 9 and mixer 8 is fed to video control block 1 and displays with a light mark on its screen. By feathering across the screen of block 1, a series of points are displayed, which are displayed on the screen as a line. Television sensor 2 is a converter of a visible image into a television signal and can be implemented, for example, in the form of a transmitting television camera. At its outputs there are television video signal coming through the mixer 8 to block 1, and frame and line pulses to the block 9 of control. Mixer-8 is used to mix pulses into a television signal.

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from the phototransducer 4 and the pulses of the position of the light pen read from the memory unit 10 for visualization on the screen of unit 1 and can be performed, for example, as a summing amplifier.

The use of the invention makes it possible to draw smooth lines on the screen of a CRT of a video control unit, select the necessary parts of the image for inputting it into a computer with greater accuracy, which is due to the use of a light pen as an informative central pulse.

Formula of invention

A device for outputting information from a screen of a cathode ray tube, comprising a video monitoring unit, optically coupled via a light pen to a phototransducer, a television sensor, two outputs of which are connected to the first and second inputs of the control unit, a group of outputs which are

Secondly, it is connected to the inputs of the memory block, a counter and a register, characterized in that it contains a signal mixer and a comparator to increase the accuracy of the device, the first input of the signal mixer is connected to the third output of the television sensor, the second input to the first output of the control unit ,

10 whose third input is connected to the output of the memory unit, the third input to the output of the comparator and the fourth input of the control unit, the output of the signal mixer is connected to the input

t5 view of the control unit, the first

the input of the counter is connected to the output of the converter, the second input is connected to the second output of the television O sensor and one of the register inputs whose outputs are connected to one of the comparator inputs, the bit outputs of the counter, except the younger one, are connected to the other inputs of the comparator, the bit outputs the counter, besides the old 5, is connected to the other inputs of the register.

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Claims (4)

Claim A device for outputting information from a cathode ray tube screen, comprising a video monitoring unit optically coupled through a light pen to a photoconverter, a television sensor, two outputs of which are connected to the first and second inputs of the control unit, a group of outputs to 65756 of which is connected to the inputs of the memory unit, a counter and a register, characterized in that, in order to increase the accuracy of the device, it 5 contains a signal mixer and a comparator, the first input of the signal mixer is connected to the third output of the television sensor, the second input to the first output of the control unit, 10 the third input of which is connected to the output of the memory unit, the third input - with the output of the comparator and the fourth input of the control unit, the output of the signal mixer is connected to the input 15 of the video control unit, the first input of the counter is connected to the output of the photoconverter, the second input is to the second output of the television 'sensor and one of the inputs of the register, the outputs of which are connected to one of the inputs of the comparator, the outputs of the bits of the counter, except the junior, are connected to other inputs of the comparator , the outputs of the bits of the counter, except for the older one, are connected to other inputs of the register. Figure 2 Figure 5