SU805404A1 - Device for displaying reference grid on crt screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING OF THE COORDINATE GRID ON THE SCREEN OF THE ELECTRON BELT TUBE

The invention relates to automation and computing and can be used in the construction of devices for displaying information on the screen of a cathode ray tube.

A device is known comprising a synchronization unit connected to a counter, a register, two comparison units, an OR element 1.

It is also known a device comprising a synchronous generator, a control unit, a switch, an analog-to-time converter, a video monitoring unit, a unit for measuring absolute values of parametrosis 2.

The closest in technical essence to the present invention is a device comprising a visual indication device, registers for the display curve of the zero line, an adder, a pulse backlight device 3.

A common drawback of the known devices is the large hardware costs for the production of zero lines (abscissa axes) and coordinate grids for reproducible graphs on the screen of the cathode ray tube, since for KAZDOY

the zero line and grid lines (scales) need an individual register. The increase in the number of zero and coordinate lines leads to a proportional increase in hardware costs. In addition, each register is strictly associated with a certain reproducible line, which leads to the need for pre-sorting of recordings into information registers (the costs of programming and the need for computer time increase).

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The purpose of the invention is to reduce the hardware cost of reproducing individual coordinate scales on the screen of a cathode ray tube, including the absolute axis, for each graph from any number of cathode graphs reproduced on the screen while at the same time eliminating the preliminary sorting of reproduced information.

This goal is achieved in that the device containing the control unit, the first input of which is the input of the device, 0 video amplifier and control unit

beam deviation, the input of which is connected with the output of the control unit, and the outputs of the beam deflection control unit and the video amplifier are connected to a cathode ray tube, an ordinate memory block, an encoder, two pulse generators, two counters, a switch, a decoder and a register are inserted, and the register inputs , the encoder, the first pulse generator and the first inputs of the counters and the switch are connected to the output of the control unit, the register output is connected to the second inputs of the first counter and the switch and to the first input of the decoder, the second input connected to the output of the second counter, and the output to the second input of the control unit, the third input of which, as well as the third inputs of the first counter, the switch and the first input of the ordinate memory unit are connected to the encoder output, the output of the ordinate memory unit is connected to the video amplifier input, and the second input - with the output of the first counter, the fourth input of which is connected with the switch output, the fourth input of which is connected with the output of the second pulse generator, and the fifth input of the switch, the input of the second pulse generator and the second input of the second account ika-connected to the output of the first pulse generator

The drawing shows the block diagram of the device for displaying the coordinate grid on the screen of the cathode-ray tube.

The device contains a control unit 1, a beam deflection control unit 2, a video amplifier 3, a cathode ray tube 4, a scale register 5, a mode encoder 6, a first generator 7 km of scales recording, a second generator 8 reading pulses of scales, a switch 9 steps, the first counter 10 scales , the second counter 11 of the number of scales, the decoder 12 of the number of scales, the block 13 of the memory of the ordinates of the scales, the bus 14 input information.

The proposed device functions as follows.

The control unit 1, through the beam deflection control unit 2, unfolds with an electron beam of a cathode ray tube 4 on its screen, a reproducible image is generated in accordance with the television standard. Behind . the scroll of the required points of the reproduced image is carried out by the video. deamplifier 3 connected to the modulator of the cathode ray tube 4.

From the input information bus 14, through the control unit 1, the initial information on the parameters of a simultaneously reproduced scale group is written to the scale register 5: the address code. sa zero scale, the code of the step between the scales, the code of the number of scales with the specified step

for each subgroup of scales. The information about the subgroups of the scales on the register 5 of the scales can be arranged in any order, i.e. There is no need to pre-sort the specified information. Within the boundaries of the subgroup of scales, the graph relating to this subgroup of scales is reproduced.

During the return stroke, this time interval is recorded by the encoder 6 of the mode connected to the output of control unit 1, information from the register output 5 scales successively for each subgroup of scales enters the inputs of the first counter 10 scales ordinate, switch 9, and decoder 12 .

In the first counter 10 ordinates of scales, the code of the address of the zero scale is recorded, the switch 9 of the step with the code of the step between the scales connects the output of the first generator 7 of pulses for recording the scales to the corresponding discharge of the first counter 10 ordinates of the scales. So, at the minimum step between the scales, the switch of the 9th step connects the output of the first generator 7 to the first (younger) discharge of the first counter 10 ordinates of the scales, at the doubled step to the second, quadrupled - to the third, etc.

To the input of the decoder 12 the number of scales receives the code of the number of scales.

Block 13 of the ordinate memory scales encoder 6 is set to the recording mode information. The amount of information stored in block 13 of the ordinate memory of the scales is equal to the maximum possible number of positions of the group of reproducible scales, for example, 16 positions of the scales - 16 bits, 32 positions of the scales 32 bits, i.e. one bit of information is used for each position of the scale. Thus, the ordinate memory unit 13 of the scales is a ruler — an indicator of the position of the reproduced scales, and the position of the indicators and the pitch between them is not fixed, but is shifted along a ruler whose position is fixed.

According to the address code of the zero scale of the subgroup of scales on the first counter, 10 ordinates of the scales are recorded in block 13 of the memory of ordinates of scales of a unit of information. Then, the counting unit plus the unit from the output of the first generator 7 through the switch. Step 9 changes the state of the first counter 10 ordinates of scales to the next one, and, as mentioned above, the distance between two neighboring states can be different and step code between scales. According to the changed address code on the first counter of the 10 ordinates of the scales, the unit of information is again recorded in memory block 3

ordinate scales. Thus, the first counter of 10 ordinates of the scales functions both as a register and as a counter. The described procedure of recording information about the subgroup of scales in the block 13 of the ordinate memory of scales will continue until the code of the number of scales at the input of the decoder 12 of the number of scales does not coincide with the code on the counter 11 of the number of scales.

The scale number counter 11 connected to the generator 7 output of the scale records counts the number of scales in the scale subgroup regardless of the step between the scales (the first generator 7 is always connected to the lower bit of the second counter number 11 scales, so the status codes of the first counter are 10 ordinates of scales and the second counter 11, the number of scales coincide in the process of counting the number of scales for a subgroup of scales with a minimum step).

As soon as the codes on the input of the decoder 12, the number of scales coincided, according to a signal from the output of the decoder 12, the number of scales unit 1. control reads the information from the output of the register of scales on the next subgroup of scales and zeroes the second counter 11. Again, the information on the subgroup of scales in the block 13 of the ordinate memory of the scales in the same way as described above.

During the return stroke, the information on all subgroups of the scales is completely recorded in the block 13 of the ordinate memory of the scales, and in the block 13 of the ordinate memory of the scales the recorded units of information can intersect (overlap) with each other, and / or do not intersect ( shifted by an arbitrary step, a multiple of the minimum) with each other ,,

At the beginning of the straight 1 "south turn along the dJioK 1 control line, switches the mode b encoder to the state corresponding to the forward run. The second gene of the 8 pulse of the scales is connected through the switch 9 of the step to the first 1 bit of the reading of the first counter 10, which at the beginning of the forward stroke is set to the initial state. Block 13 of the ordinate memory of the scales is transferred to the information reading mode.

The need for two generators 7 pulses and 8 is explained by the fact that the rate of recording information in block 13 of the memory of the ordinates of the scales during the reverse cycle of the frame is determined by the amount of information that needs to be written in block 13 of the memory of the ordinates of the scales for the specified interval time, and the rate of reading information does not depend on the amount of information in block 13 of the ordinate memory of the scales, but is determined only by the speed of movement of the beam across the screen of the electron-beam tube 4 along the line unfolding the reproduced image

and the distance between adjacent image elements. The first counter of 10 ordinates of scales, functioning in the mode of only counter, calculates in turn and sequentially all the addresses in block 13 of the memory of ordinates of scales. If an information unit is recorded in the currently selected address during the forward run of the line, it is read

from the block 13 of the ordinate memory of the shkgsh, it excites the video amplifier 3 connected to the modulator of the electron-beam tube 4, thereby illuminating one element of the image on the line developing the image.

The set of illuminated points of all lines during the forward course of the frame forms the scale of all subgroups of scales.

The zeroing of the unit 13 of the ordinate memory of the scales is carried out by the control unit 1 during the other course of the line in the read-write cycle, or during the retraction of the frame.

When using new elements - the register of scales, the encoder of the mode, two pulse generators, the switch of the step, two counters, the decoder of the number of scales and the block

memory ordinates of scales - hardware costs for reproducing individual coordinate scales on the screen of the electron-beam tube, including the abscissa axis, are reduced,

for each graph from any number of electron-produced on the screen: electron tube: tube graphs while excluding pre-sorting of the reproduced information. The increase in the number of reproducible coordinate scales leads to a slight increase in hardware costs compared with a proportional increase in hardware costs in the known device.

Claims (3)

1. USSR author's certificate 529469, cl. 2 G Rev. 15/20, 1976. 2; Druzin Y.Ya. and Koganer S.E. Television systems display information. L., Energie, 1971p. i8-44. 3. For the application of FRG 2540766, cl. 2 G 06 K 15/20, 1977 (prototype). L 12