SU1674191A1 - Device to generate a scale on crt display - Google Patents

Abstract

The invention relates to automation and computing and can be used in devices for visual display of information on the screen of a cathode ray tube with a raster scan. The purpose of the invention is to improve the accuracy of the device. This goal is achieved by introducing into the device a counter, the counting input of which is connected to the synchronization input of the pulse shifting unit horizontally, the dynamic elevation unit, the control unit, the third inverter, the fifth and sixth And elements, and the second OR element, the output of which is connected to the second input of the second element OR. Such a device allows forming on the screen of a CRT both a static linear small-scale scale and a dynamic large-scale scale having the form of a "window" on the screen of a CRT. 3 il.

Description

The invention relates to automation and computing and can be used in devices for visual display of information on a screen of a cathode ray tube (CRT) with raster scan.

The purpose of the invention is to improve accuracy.

FIG. 1 shows a functional diagram of the device; in fig. 2 - amplitude characteristic of the functional converter; in fig. 3 is a block diagram of the formation of dynamic elevations.

The device contains a block of 1 shift of pulses horizontally, a counter 2, a block 3 of forming dynamic levels, a block 4 of control, a functional converter 5, a driver 6 of pulses, a fifth element I 7, a third inverter 8, the first

comparator 9, sixth element AND 10, second comparator 11, sawtooth generator 12, trigger 13, second element OR 14, first and second elements 15 and 16, first and second inverters 17 and 18, third and fourth element j 19 and 20 and the first element OR 21.

The first synchronization input of unit 1 is connected to the counting input of counter 2, and the output is connected to the input of the pulse former 6, the output of which is connected to the first inputs of elements 15 and 16. The first input of element 7 is connected to the output of counter 2 and the first control input of block 3 and the output is connected to the first input of the element OR 14. The first input of the element And 10 is connected to the output of block 3, the second input is connected to the output of the inverter 8. And the output is connected to the second input of the element OR

ON

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14, the output of which is connected to the second input of the element 16. The second input of the first comparator 9 is connected to the output of the unit 5, the first input is connected to the output of the sawtooth voltage generator 12 and the second input of the second comparator 11, and the output is connected to the second installation input of the trigger 13 , the first installation input of which is connected to the second input of the unit 3, and the output is connected to the input of the generator 12 of the sawtooth voltage and the second input of the element 15. The first input of the second comparator 11 is connected to the output of the control unit 4 and the first input of the block 5, and the output is connected to the third control input of the unit 3, the second input of the element And 7 and the input of the inverter 8. The first input of the element And 19 is connected to the output of the inverter 17, the second input is connected to the output of the element 16 and the input of the inverter 18, the output of which is connected to the first input element AND 20, the second input of which, in its turn, is connected to the output of the element 15 and the input of the inverter 17, and the output is connected to the second input of the first element OR 21.

The dynamic elevation unit 3 may be executed according to the scheme shown in FIG. 3, and consists of a trigger 22, the first and second elements And 23 and 24, and the first and second counters 25 and 26. The first input of the trigger 22 is connected to the first input of the counter 26, the second input of the And 24 element and the third input of the second counter 26, and the output connected to the first inputs of the elements And 23 and 24.

The first input of the counter 25 is connected to the output of the element And 23, the second input of the counter 25 is connected to the output of the element And 24, and the output is connected to the second input of the counter 26.

The device works as follows.

Horizontal sync pulses are applied to the horizontal pulse shifter 1, which uses a pending multivibrator. This unit shifts the scale and index-index along the television raster horizontally in accordance with the shift signal, which is fed to the second input of unit 1.

The pulses from the output of this block are fed to the input of the imager of 6 pulses, which sets the width of the index-pointer and the length of the scale divisions.

The signal of the monitored parameter is fed to the second input of the functional converter 5, initially having a linear characteristic (direct exhaust gas in Fig. 2), and from the output of the converter 5 the resulting signal is fed to the second input of the comparator 9, to the first input of which a sawtooth voltage is supplied 12. At the moment of equality of these signals at the output

the comparator 9, a signal is generated that triggers the trigger 13. This trigger is reset to zero by frame clock pulses arriving at the first input of the trigger 13. The signal,

formed by trigger 13, determines the index index length.

The input of counter 2 receives horizontal sync pulses, along which counter 2 forms horizontal lines of a small-scale static scale. The pulses from the output of counter 2 are received through the element 7 and the element OR 14 opened at that time by the signal from the output of the comparator 11 and the second input of the element 16. And the inputs of the element 19 also receive a direct scale division signal and an inverted index-inverted signal 17. The inputs of the AND 20 element receive a direct index-index signal from the AND 15 element output and an inverse scale division signal from the inverter output 18. From the outputs of the AND 19 and 20 elements, the signals arrive at the inputs of the OR 20 element.

Consider the mode of formation of a dynamic large-scale scale. In this mode, control signals arrive at the first input of converter 5, as a result, the amplitude characteristic of unit 3 takes on the form shown by the OABWG broken line in FIG. 2. The AB section has a steepness, which is n times larger than the direct exhaust gas, the BV section is parallel to the UBX axis. The AB plot is the working plot, which determines the formation of the index indicator within the limits of a dynamic large-scale scale.

Since the AB section has a large slope, when the input signal changes in the range between Ui and U2 (Fig. 2), the output signal of block 3 changes to a much larger extent than when the amplitude characteristic of block 3 has the form 0B; ultimately, this leads to the formation of a window in the image on the CRT screen, in which the signal index-index is generated on a larger scale than on the rest of the CRT screen, where the scale of the index-index is determined by a static scale scale.

At the same time, from the output of the control unit 4, voltages determining the width are applied to the first input of the comparator 9.

windows (U3 and U4, fig. 2) and the voltage of the middle of the window (U5).

As a result of the comparison, a window center pulse is generated, which is fed to the second input of block 6, and a pulse that determines the location on the CRT screen and the window width, which goes to the second input of element And 7 and the input of the inverter 8 and blocks the formation of static scale on the CRT screen the scales within the window and allows the formation of a dynamic large-scale scale within the window, which is accomplished by the block 3 of forming dynamic scale marks. The operation of block 3 is synchronized by static-scale pulses arriving at the first input of block 3 from the output of counter 2, as well as by a set of synchronizing sequences of pulses arriving at the synchronizing input of block 6. The frame sync pulses arriving at the second input of trigger 22 set trigger 22 to one state, and thus the passage of the clock pulse sequence from the output of the synchronization unit 1 through the AND 24 element to the summing second input of the counter 25 is permitted. Data tracking frequency ruyuschih pulses as many times greater than the frequency sequencer horizontal sync pulses, the number of times the slope portion AB (FIG. 2) over the forward slope exhaust gas. The counter 25 is periodically zeroed by static-scale pulses coming from the output of counter 2 through the open element 23 to the zeroing input of counter 25. This counter operation continues until the output of comparator 11 to the second input (zeroing) of trigger 22 does not come middle of the window. In this case, the flow of the clock and zeroing pulses to the input of the counter 25 upon the arrival of the next frame sync pulse arriving at the first input of the counter 26 stops, information about the state of the counter 25 supplied to the second (setting) input of the counter 26 is recorded into the counter 26. The third (subtracting) the input of the counter 26 is supplied to the lower case clock pulses, and the counter 26 starts the recalculation, not from the zero state, but from the one that was written to it. At the moments of zeroing the counter 26, pulses appear at its output, forming a dynamic large-scale scale.

In this way, the attachment of large-scale and small-scale scales is carried out.

The m m counter 25 is chosen so that

P1

2 Ni, where N1 is the number of raster lines between two adjacent lines of the static scale.

The width of the P2 counter is chosen such that 2Hl N2. where N2 is the number of raster lines between two adjacent lines of the dynamic scale.

0 The position and dimensions of the ABC section (Fig. 2) of the amplitude characteristic of the converter 5 can be changed - shift it according to the initial characteristic of the exhaust gas, as well as change the difference between the values of Mwio Ui

5 and U2, which means the possibility of changing the size and position of the window with a large-scale scale on a CRT screen, which provides additional convenience of observing the index index on the screen

0 CRT

The proposed device allows forming on the screen of a CRT both a static-linear small-scale scale and a dynamic large-scale

Figure 5 shows a window on the CRT screen, with the possibility of adjusting the size and position on the CRT screen, which provides an improvement in the visibility and accuracy of displaying the signal index-index on

0 screen CRT.

Claims (1)

Formula Shadow Invention A device for forming a scale on the screen of a cathode ray tube containing a unit for shifting pulses horizontally. the output of which is connected to the input of the pulse generator, the output of which is connected to the first inputs of the first and second elements I, the first comparator, one input of which is connected to the output of the functional converter, the other input to the output of the sawtooth generator, and the output connected to one of the adjusting trigger inputs, the output of which is connected to the control input of the ramp voltage generator 5 and to the second input of the first element I, the output of which is connected to the input of the first inverter and the fourth input And, the second input of which is connected to the output of the second inverter, the input of which is connected to the output of the second element And to the second input of the third element And, the first input of which is connected to the output of the first inverter And the outputs of the third and fourth elements And the OR element, the output of which is the output of the device, the information input of which is the information input of the functional converter, which is intended to increase the accuracy, it contains a counter, a forming unit dynamic marks, the third inverter, the fifth and the sixth elements I. a second element OR, a control unit and a second comparator, the first input of which and the control input of the function converter are connected to the outputs of the control unit, the clock input of the horizontal shift unit is the first clock input of the device and is connected to the counter input of the counter, the output of which is connected to the first input of the fifth element I and to the first control input of the block of forming a dynamic elevation, the second control input of which connected to the output of the second comparator, to the input of the third inverter and the second the input of the fifth element And, the output of which is connected to the first input of the second element OR, the second input of which is connected to the output of the sixth element And, the second input which is connected to the output of the third inverter, and the first input of the sixth element I is connected to the output of the dynamic elevation block, the synchronization input of which is connected to the other setup input of the trigger and is the second synchronization input of the device, the control input of which is the control input of the pulse shift unit horizontally, moreover, the generator output of the sawtooth voltage is connected to the second input of the comparator, and the output of the second element OR is connected to the second input of the second element I. FIG. I Ufa i R FIG.