SU1700568A1 - Crt coordinates locator - Google Patents

Abstract

The invention relates to automation and computing and can be used in the visual programming of automata for inputting the coordinates of points in a computer. The aim of the invention is to improve the speed of the device. For this purpose, a device containing a coordinate remover, a memory unit, an electron-beam indicator, AND elements, two triggers, counters, delay elements, OR elements, comparison elements, registers, AND element blocks, AND NAND element, pulse generator , six counters, two registers, two OR elements, two AND blocks, four AND elements, two delay elements, two triggers, a pulse shaper, a NOT element, a constant voltage source, a switch, and comparison elements, based on which the circuit is implemented, are introduced formations are flat light spots that allow the pen to fix the coordinates of the specified points of the trajectory in each frame, regardless of the background image, which reduces the time to enter information into the computer. 2 Il. (/ WITH

Description

The invention relates to automation and computer technology and can be used to read coordinates from a screen of a cathode ray tube, in particular, in the visual programming of machines for entering coordinates of points into a computer.

The aim of the invention is to increase speed by increasing the speed of reading coordinates from the screen of a cathode ray tube.

FIG. 1 is a block diagram of the device; in fig. 2 - the same.

The device for reading the coordinate of the screen of the cathode ray tube contains the puller 1 coordinate}, made in the form of a light pen, memory block 2, cathode ray indicator 3, first element 4, first pulse shaper 5, second element 6, first trigger 7 , the second trigger 8, the third element And 9, the fourth element And 10, the first 11, the second 12 counters, the fifth element And 13, the first element 14 delay, the sixth element And 15, the second 16 and the third 17 delay elements, the first element OR 18 , the third 19 and fourth 20 counters, the second 21 and third 22 elements And LI, the first comparison element 23, the fourth delay element 24, the first 25 and second 26 registers, the first 27 and second 28 blocks of elements AND, the NAND element 29, the second 30 l third 31 comparison elements, the generator of 32 pulses, the fifth 33 and sixth 34 counters, third 35, fourth 36 blocks

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And elements, the second shaper 37 pulses, the seventh element And 38, the element NOT 39, the third trigger 40, the fifth delay element 41, the first 42, the second 43, the third 44 and the fourth 45 reversible counters, the sixth delay element 46, the third 47 and fourth 48 registers, fourth trigger 49, fourth 50, fifth 51, sixth 52, seventh 53, eighth 54 and ninth 55 comparison elements, fourth element OR 56, eighth 57, ninth 58 and tenth 59 elements AND, fifth element OR 60, switch 61, constant voltage source 62, television sensor 63.

The device works as follows.

The drawing of the desired trajectory on the screen of the indicator 3 is carried out when the light pen 1 comes in contact with it. As long as the light pen 1 contacts the screen, the second potential is maintained at a constant potential, the opening element AND 38 and element And 6, on the other the input of which is initially supplied with a permitting signal from the inverse output of the trigger 8. At the same time, the input from the output of the element 6 is inputted to the input of the formers of 5 pulses.

At the moment when the pen 1 is in contact with the screen at the output of the element 6, a positive potential drop is formed, which starts the pulse shaper 5, a short pulse appears at the first output of the latter, corresponding to a positive signal drop that directly resets the counter 19, trigger 49, through the OR element 22 - registers 25 and 26, and, having passed through the OR element 21, resets the counter 20. In this case, the second inputs of the comparison element 30 are acted upon by the code 0, coming from the counter 11, and on the first - the code 0, arriving from the register 25. In the same way, the second inputs of the comparison element 31 are acted upon by the code 0, coming from counter 12, and on the first, the code 0, arriving from the register 26. At the outputs of the comparison elements 30 and 31, Equals are generated, which are fed to the inputs of the I- element. NOT 29, as a result of which, at the output of the latter, a signal prohibiting the AND 15 element is emitted.

A short pulse generated by the shaper 37 pulses on the leading edge of the first personnel pulse that arrived at its input, through the element I 38, initially resolved through other inputs, sets the triggers 40 and 49 to 1 When

This signal from the output of the trigger 49 prohibits the element 38 and the signal from the output of the trigger 40 through the element OR 60 switches the switch 61 to the state where a constant voltage source 62 is connected to the input of the electron-beam indicator 3 provides screen illumination by sweeping the entire frame

0 beam maximum brightness.

At the same time, the signal of the driver 37 is turned on through the element AND 4, the light pen 1, and the trigger 7 switches to one state. After this pen 1

5 is capable of reacting to a light pulse at the moment when the electron beam passes through the screen of the electron-beam indicator 3, and elements 9, 10 and 13 are enabled by the trigger signal 7.

0 pulse from the output of the indicator 3 passes through the element And 10 and resets the counter 11. Continuous pulses come through the element And 9 to reset the counter 12, as well as to the counting input of the counter 11.

5After installing the counter 12 to zero

the state begins to read the pulses from the generator of 32 pulses passing at its input through the element I 13.

At the time of passage of electronic

0 a beam through the touch of pen 1 to the screen pen 1 generates a pulse signal, which sets the trigger 7 to the zero state. In this case, the elements And 9, 10 and 13 are closed, and in counters 11 and 12

5, the measured values of the corresponding screen coordinates of the first point of the specified path are stored. After writing to the counters 11 and 12 of the screen coordinates of the first point, the registers 25 and 26 remain in the original

0 (zero) state, and at the inputs of the elements 30 and 31 comparison are different codes. In this case, at their outputs, the signals are equally not produced and, therefore, at the output of the element, NAND 29 generates 5 s a signal allowing an AND 15 element.

According to the negative differential at the output of the trigger 7, a delay element 14 is triggered, producing a pulse, which through the element 15 enters the input

0 Writing memory block 2 and to the input element 16 delay. Under the action of this pulse, the contents of the counters 11 and 12 are recorded in the cell of the memory block 2, and on the trailing edge of this pulse, element 16 is triggered.

5, which produces a pulse arriving through the OR element 18 at the counting input of the counter 20, changes its state to 1. In this case, the next cell of the memory block 2 is prepared for operation. The pulse from the output of the element 16 delay

also enters the counting input of the counter 19, the input of the delay element 24, and through the OR element 22 - to the reset inputs of registers 25 and 26. Under the action of this pulse, the state of the counter 19 changes to Register 25 and 26 to the zero state, and trigger 24 is triggered. At the same time, at the output of the delay element 24, a pulse is generated, under the action of which the counter code 11 (coordinate Y) through block 27 of the elements And is recorded in register 26, and the counter code 12 (coordinate of x) through the block 28 of elements And into register 26.

By the time the pulse of the delay element 16 ends, the counter codes 19 and 20 coincide, and a signal is generated at the output of the comparison element 23 that prohibits the trigger 8 from being set to one, resulting in the trigger 8 remaining in the zero state.

By the time the pulse element 24 of the delay ends, the first point Y coordinate (line number code) is recorded in register 25, and the first point X coordinate (element number code in line) and counter codes 11 and register 25, counter 12 are written into register 26. and register 26 will match. As a result, the Equals signal is produced at the output of the comparison elements 30 and 31, under the action of which the signal denying the AND element 15 is generated at the output of the NAND 29 element. In addition, the coordinate code of the first read point from the outputs of the register 25 enters the inputs of the AND block 36 and the code of the X coordinate of the first read point from the outputs of the register 26 is fed to the inputs of the block 35 of the elements I.

Further, the next frame sync pulse coming from the output of the electron-beam indicator 3 through the shaper 37 and the HE element 39 sets the trigger 40 to the initial state, and through the element 4 it switches on the light pen 1 and sets the trigger 7 to the single state. As a result, during the action of the second frame, the elements 19, 10 and 13 are resolved by the trigger signal 7, and the reading coordinates of the point that is currently under the light pen 1 on the screen of the electron-beam indicator 3 begin. The coordinates of this point are read in a similar way described above.

The frame sync pulse sets the counter 34 to the zero state, polls the blocks 35 and 36 elements I. The pulse from the output of the driver 37 pulses through the delay element 41 is performed

recording information from the outputs of blocks 35 and 36 elements And in reversible counters 42,

43 and 44, 45 respectively. The same impulse delayed by elements 41 and 46

5 delay, recording of information from the outputs of blocks 35 and 36 into registers 47 and 48, respectively, is carried out, as well as an increase in the content of reversible counters 42 and

44 units and a decrease by unit 0 of the contents of the reversible counters 43 and

45.

Codes from the outputs of counters 44, 45 and register 48 are received respectively at the first inputs of the elements 54, 55, 53 of the comparison,

5, codes from the outputs of the register 47 and the counters 42 and 43 are fed to the inputs of the comparison elements 50-52. The other inputs of the comparison elements 53-55 receive the code from the output of the counter 34, which counts

0 the number of lines in the frame, and the second inputs of the comparison elements 50-52 receive the code from the output of the counter 33, which counts the number of elements in each row of the frame.

5 Comparison elements 53-55 select the rows on the raster of the electron-beam indicator 3. The comparison element 53 generates a signal when the beam of the electron-beam indicator 3 passes through the line on which the light pen 1 is currently located, the comparison element 55 forms the signal when the beam passes through the previous one, and the comparison element 54 - in the subsequent line. Elements 50-52

5 comparisons select elements in previously selected rows. The reference element 50 generates a signal at the moment when the electron beam of the indicator 3 passes through a point on the screen on which the light pen 1 is standing,

0, the comparison element 52 generates a signal when the electron beam is located on the previous one, and the comparison element 51 generates a signal when the beam is located at a subsequent point of the selected line.

five

When the codes at the inputs of one of the comparison elements 53-55 match, an equal signal is generated at its output, which is fed to the first input of the corresponding element 57, 58 or 59, i.e. selects a row. The second inputs of the elements And 57-59 through the element OR 56 receive signals from the outputs of the elements 50-52 comparison.

5 The illumination signal of a row element is generated at the output of that comparison element 50-52, at the output of which the code of the number of the current element of the line, coming from the output of the counter 33, coincides with the code acting at its second input. In this way, the element in the row is selected.

Under the action of the signals of the comparison elements 50-55, the light pulses are generated at the outputs of the corresponding elements 57-59, which through the element OR 60 switches the switch to the state allowing the voltage of the constant voltage source to pass through it to the input of the electron-beam indicator 3.

As a result, an illumination area is formed on the raster of indicator 3, within which the illumination is performed by a beam of increased brightness. Moreover, the area on the raster is positioned in such a way that the point of contact between the light pen 1 and the screen of the indicator 3 is the center of the area.

During the formation of an electron-beam indicator 3 on the raster on the raster (at the moment when the high-brightness electron beam passes through the touch point of the pen 1 to the screen), the pen 1 is illuminated, at the output of which a pulse signal is formed that sets the trigger 7 to the zero state. At the same time, elements 9, 10 and 13 of the trigger signal 7 are closed, and in counters 11 and 12, until the end of the current frame, the measured values of the corresponding screen coordinates of the point of the specified trajectory in which the pen 1 was located at the time of reading are stored.

If the light pen 1 is located elsewhere on the screen, then after reading the coordinates, the coordinates of the second (new) point will be written to counters 11 and 12, and the coordinates of the first (previous) point previously read will be saved in registers 25 and 26. Now the codes of the counter 11 and the register 25, the counter 12 and the register 26 do not coincide, and, therefore, at the outputs of the elements 30 and 31 of the comparison, the Equals signal is absent. In this case, a signal is generated at the output of the NANDA element 29, allowing element I 15. Next, by a negative differential signal from the output of the trigger 7, delay element 14 is triggered, the signal of which, through the permitted element 15, starts delay element 16, records the data of the counters 11 and 12 to memory block 2, and then the work is carried out as described above. .

If, when turned on by a frame sync pulse of the read mode, the light pen 1 will be at the point of the trajectory whose coordinates were previously read, then after re-reading these coordinates, the codes of the counter 11 and the register 25, the counter

12 and register 26 will be the same. In this case, the elements 30 and 31 of the comparison and the element AND-NOT 29 produce a signal that prohibits the element 15. Now the signal with

the output of the delay element 14 to the memory block 2 and to the delay element 16 will not pass; the recording will not be repeated in the memory block 2 of the screen coordinates of the same point, and therefore not

0, the contents of registers 25 and 26 change. But since the contents of registers 25 and 26 do not change, the same codes will be overwritten in registers 47 and 48 and in reversible counters 42-45, as a result

5 signals from the And 57-59 elements on the raster of the electron-beam indicator 3 will form the illumination area, the coordinates of which will not change, i.e. the pad on the raster will not move.

0 Thus, during the action of the first frame, the coordinates of the first point of the trajectory are read, the read coordinates are written into memory block 2 and into registers 25 and 26. During the validity period of the frame sync pulse following the first frame, the previously read coordinates are overwritten the first point from registers 25 and 26 to registers 47 and 48 and to counters 42-45. Further in the period of validity

0, the second frame is used to form on the raster the electron-beam indicator 3 of the illumination area, read the coordinates of the point on the raster where the light pen 1 is currently located,

5 and the recording of these coordinates in memory block 2.

By the end of the stroke, the light pen 1 on the screen of a certain trajectory in the cells of the memory block 2 will record the screen coordinates X and Y of the points of this trajectory,

0 In this case, the counter code 19 coincides with the counter code 20 and this code corresponds to the number of trajectory points read.

At the moment when the pen 1 is detached from the screen, a negative

5, the signal drop by which the AND 6 and 38 elements are prohibited. When the AND 6 element is prohibited, a pulse appears at the second output of the imprinter 5 connected to it at the pulse generator, which resets the counter 21 through the element OR 21 and the counter codes 19 and 20 cease to coincide, and at the output of the element OR 22, a signal is generated that arrives at the second installation input of the trigger 8, thereby allowing the trigger 8 to be set to one state. According to the same signal of the pulse driver 5, which arrives at the first input of the trigger 8, the latter is set to one state, issuing an interrupt signal of the device and thus signaling

the end of the measurement cycle of the screen coordinates, Therefore, by the end of the device operation in the memory block 2, the coordinates of the screen points of the trajectory read by the coordinate remover will be found. This data can be overwritten in the memory of a computer or other device using inputs / outputs 64-66,

Upon receipt of the signal from the first output, it is necessary to send clock pulses to the input 66 of the device until the counter codes 19 and 20 become equal, i.e. until all the occupied cells of memory 2 have been rewritten, the OR element 22 produces a signal that sets the trigger 8 to the zero state, thereby removing the interrupt signal from the first output 64 of the device.

The frame sync pulse reads the code of one cell of memory block 2.

Claims (1)

Invention Formula A device for reading the coordinate of the screen of a cathode ray tube containing a coordinate remover, a memory unit, a cathode ray indicator, the first And element, the first input of which is connected to the input of the first pulse generator and the output of the second And element, and the output connected to the S input of the first the trigger and to the input of the coordinate remover, one output of which is connected to the R input of the first trigger, and another output connected to the first input of the second element I, the second input of which is connected to the inverse output of the second trigger, the direct output of which This is the first output of the device, the outputs of the horizontal and vertical synchronization of the electron-beam indicator are connected respectively to the first inputs of the third and fourth And elements, the outputs of which are connected respectively to the counting input and the reset input of the first counter, the output of which is connected to the first information input of the memory block, the second the information input of which is connected to the output of the second counter, the reset input and the counting input of which are connected respectively to the outputs of the third and fifth elements I, the second input Which are connected to the second input of the fourth And element, the input of the first delay element and connected to the forward output of the first trigger, the output of the first delay element is connected to the input of the sixth And element, the output of which is connected to the input of the second delay element and the Recording input of the memory unit, input The reading of which is the first input of the device and is connected to the input of the third delay element, the output of which is connected to the first input of the first OR element, the second input of which is connected to the counting input of the third counter and swing second delay element and the output of the first OR gate connected kschetno- 5 th entry of the fourth counter, whose reset input is connected to the output of the second OR gate, and a group of outputs is connected to the group address inputs of the memory block and the first group of information inputs 0 of the first comparison element, the second group of information inputs of which is connected to the group of outputs of the third counter, the reset input of which is connected to the first output of the first pulse generator, 5 to the first input of the third OR element and the first input of the second OR element, the second input of which is connected to the second output of the first driver of pulses and to the R-input of the second trigger S-input of which 0 is connected to the output of the first comparison element, the second input of the third element OR is connected to the input of the fourth and the output of the second delay element, and the output is connected to the reset inputs of the first and second 5 registers, the output of the fourth delay element is connected to the first inputs of the first and second blocks of the AND elements, the second input of the sixth AND element is connected to the output of the NAND element, the first and second inputs 0 which are connected respectively to the outputs of the second and third comparison elements, the first groups of information inputs of which are connected respectively to the outputs of the first and second registers, 5, the second group of information inputs of the second comparison element is connected to the group of inputs of the first block of elements And with the group of outputs of the first counter, and the second group of information inputs of the third 0 comparison element is connected to a group of inputs of the second block of elements AND and a group of outputs of the second counter, the outputs of the first and second blocks of elements AND are connected respectively to the information inputs 5 of the first and second registers, the second input of the fifth element I is connected to the output of the pulse generator, the output of the memory unit is the second output of the device, which is intended to increase 0 speed, it contains a fifth counter, the counting input of which is connected to the output of the pulse generator, and the reset input is connected to the counting input of the sixth counter and the horizontal synchronization output of the electron-beam indicator, the frame synchronization output of which is connected to the reset input of the sixth counter, inputs resolution of the third and fourth blocks of the elements And and the input of the second pulse generator, the output of which is directly connected to the second input of the first element And and the first input of the seventh element And, through the element NOT - with the reset input of the third trigger, through the fifth delay element - with the write inputs of the first, second, third and fourth reversible counters, and after the fifth and sixth delay elements - with the summation inputs of the first and third and with the subtraction inputs of the second and fourth reversing counters and recording inputs of the third and fourth registers, the second input of the seventh element I is connected to the output of the coordinate remover, the first output of the first pulse shaper is connected to the reset input of the fourth trigger, the counting input of which dinene with the counting input of the third trigger and connected to the output of the seventh element And, the third input of which is connected to the direct output of the fourth trigger, the group of information inputs of the third register, the first and second reversible Counters are combined and connected to the group of outputs of the third block of elements And, a group of information inputs the fourth register, the third and fourth reversible counters are combined and connected to the group of outputs of the fourth block of elements AND, the group of information inputs of the third and fourth blocks of elements Ents And are connected respectively to the output groups of the second and first registers, the output groups of the third register, the first and second reversible counters, the fourth register, the third and fourth reversible counters are connected to the second groups information inputs of the fourth, fifth, sixth, seventh, eighth, ninth elements of the comparison, the first groups of information inputs of the fourth, fifth and sixth elements respectively comparisons are combined and connected to the group of outputs of the fifth counter, the first groups of information inputs of the seventh, eighth and ninth elements of the comparison are combined and connected to the group of outputs the sixth counter, the outputs of the fourth, fifth and sixth elements of the comparison are connected to the inputs of the fourth element OR, the output of which is connected to the second inputs of the eighth, ninth and tenth elements And, the first inputs of which are connected respectively to the outputs of the seventh, eighth and ninth comparison elements, the outputs of the eighth, ninth and tenth elements of AND are connected respectively to the second, third and fourth inputs of the fifth OR element, the first input of which is connected to the direct output the third trigger, and the output to the control input of the switch, the information inputs of which are connected to TV sensor output and constant voltage source, and the output to the input electron beam indicator.