SU1621062A1 - Device for reading graphic information - Google Patents

Abstract

The invention relates to computerized automation and can be used to automate the conversion of graphic information into digital codes for subsequent input into computers. The purpose of the invention is to improve the accuracy of reading. The goal is achieved by excitation of two adjacent tablet buses by polling currents of one direction and one amplitude and forming half-readings of signals, which is provided by introducing the OR elements, the third and fourth switches, the address selector, the delay element, the counter. 1 hp f-ly, 4 ill.

Description

The invention relates to automation and computing, in particular to devices for reading graphic information, and can be used to automate the conversion of graphic information into digital codes for subsequent input into electronic computers.

The purpose of the invention is to improve the accuracy of reading.

FIG. 1 shows a block diagram of the device, FIG. 2 is a control block diagram; FIG. 3 is a diagram of the fourth switch; FIG. 4 is an address selector diagram.

The device contains (Fig. 1) a tablet 1 with coordinate tires 2, the first 3, the second 4 and the third 5 switches, which contains the switching node 6 and the elements OR 7, the puller 8 coordinates,

made in the form of a compensation frame 9 and a read element 10, an amplifier 11, a coordinate determining unit 12, a compensation pulse generating unit 13, a fourth switch 14, a generating unit 15 for reading half-bodies made in the form of an address selector, a counter 16, a delay element 17 and a block 18 management

The control unit contains a pulse generator 19, the first element OR 20, the first 21 delay elements, the counter 22, the decoder 23, the trigger 24, the first 25, the second 26, the third 27, the fourth 28, the fifth 29, the sixth 30 and the seventh 31 elements And a group of 32 and 33 elements And, the second 34 element OR, the second element 35 of the delay.

The fourth switch contains keys 36-39 and bus 40, and the selector is ad21621062

sa - elements And 41-44, elements 1Shi 45-46 and triggers 47 and 48.

The device works as follows.

When the 10-item / - vani puller 8 coordinate unit is combined with a readable point, the key embedded in the read-out element 10 is closed and along the common reset inputs (the key and the general reset inputs on the diagram are conventionally not shown) these devices. In this case, in the counter 16, in the initial state, a certain number is recorded, corresponding to half the distance between adjacent tires, and a pulse generator 19 is started, generating two series

ten

15

16 is set to subtraction mode. If the read point is close to bus 2 in the right half-zone, then the signal induced in read element 10 passes through the first output of amplifier 11 to input of element 43 of block 15 and sets trigger one to 48, and the score 16 is set to add mode. If the reading point is strictly in the middle of the section between adjacent tires 2, then the operation of counter 16 is further prohibited and the initial number is confirmed in it, confirmed by the signal from the ninth output of block 18. The initial state of block 13 is also confirmed.

pulses TI1, TI2, shifted by half 20 TI2, passing through the element And 27, period relative to each other. element OR 20, delay element 21

and the counter 22, the decoder 23 is transferred to the exact reading mode (active third output of the decoder 23)

In the initial state, the first output of the counting trigger 24 through the first switch 3 resolves to the system X coordinate buses 2 of the tablet 1. The clock frequency ТИ1 through the third output of the t8 block enters the switch 4 by performing serial polling of the switches 2. Switching the counter in the switch 4 is provided by the tact frequency TI2 passing through the element AND 26 due to the resolution from the first output of the decoder 23 states and through the fourth output of the block 18, the serial polling of tires 2 ends with the formation on the element 10 of the reading the signal induced as a result of polling the first after the read point of bus 2. The signal through the second output of amplifier 11 passes to the element AND 25 of the block 18 and through the element OR 20 and the delay element 21 switches the counter 22. The decoder 23 from the mode of polling tires 2 goes into simultaneous interrogation of two adjacent buses. In this mode, switch 5 is enabled, as a result of which two corresponding buses 2 are interrogated through the corresponding elements OR 7. In this case, three situations are possible. If the read point is closer to the bus 2 in the left half-zone, then the signal induced in the read element 10 passes through the second output of the amplifier 11 to the input of the element 41 And block 15 and sets the trigger 47 to one state, whereby the counter

16 is set to subtraction mode. If the read point is closer to the bus 2 in the right half-zone, then the signal induced in the read element 10 passes through the first output of the amplifier 11 to the input of the element 43 I of the block 15 and sets the trigger 48 in one state, and the counter 16 is set to the add mode. If the reading point is strictly in the middle of the section between adjacent tires 2, then the operation of counter 16 is further prohibited and the initial number is fixed in it, confirmed by the signal from the ninth output of block 18. The initial state of block 13 is also confirmed.

0 TI2 passing through the element AND 27, the element OR 20, the element 21 delay

five

0

five

0

five

0

five

and the counter 22, the decoder 23 is switched to the exact counting mode (active third output of the decoder 23),

In this mode, simultaneous polling of tires 2 with adjacent numbers is accompanied by synchronous excitation of the frame.

9 compensation by a sequence of pulses from block 13, starting with the maximum amplitude. In this case, if the read point is in the right half-cavity, the compensation pulses are delivered to the frame 9 through the key 36 of the fourth switch and closed on the key 38 and after each compensation cycle, a single pulse is added to the counter 16. If this condition is not confirmed, then the compensation pulses pass to the frame 9 through the key 37 and after the frame 9 through the key 39, while in the left half-zone

a single impulse is subtracted from the contents of counter 16 after each polling cycle. The exact sampling process ends with a signal from the second output of amplifier 11, if the reading point is in the right half-half between adjacent buses 2, or with a signal from the first output of amplifier 11, otherwise signals are received through element 30 or element 29 , then through the element OR Ј0 and the delay element 21 on the counter 22.

The decoder 23 enters the fourth state. In this state, input formed on the counter of switch 4 and on counter 16 is entered, taking into account the constant linking the origin of coordinates to the first bus 2, via an adder in one of the registers of block 12. If there is a resolution from trigger 24 on the first output, then the input signal passes through the element II 33 and the sixth output of block 18 to the register of the X coordinate of block 12.

Entering the value of the coordinate Y is carried out through the element AND 32 and the seventh output of block 18. After entering the value of the coordinate in the block 12 pulses TI2 through the element 31 and through the elements 20 and 21, the counter 22 returns to its original state, the decoder 23 allows the serial polling of the buses 2 (at the first output), the counter of the second switch 4 and the elements OR 45 and 46 of the triggers 47 and 48 of the block 15 are reset (via delay element 35). The counting trigger 24 at the signal front from the first output of the decoder 23 switches to survey friend oh coordinates. The process of determining the value of another coordinate is similar to that described and does not require an explanation.

Claims (2)

1. A device for reading graphic information containing a tablet made in the form of a system of orthogonally located coordinate tires, the inputs of which are connected to the output of the first switch, the synchronization inputs of which are connected to the first and second outputs of the control unit, the third, fourth and fifth outputs of which are connected to the synchronization inputs of the second switch, the coordinate remover, the output of which is connected to the input of the amplifier; the outputs of which are connected to the first and second information inputs of the control unit, The coordinate determination unit, the synchronization inputs of which are connected to the sixth and seventh outputs of the control unit, the eighth and ninth outputs of which are connected to the synchronization inputs of the compensation pulse shaping unit, due to the fact that, in order to improve the accuracy of the device, a third switch has been entered into it , whose information entry is connect16210626 It is connected with the output of the second switch, the synchronization inputs are connected to the third and tenth outputs of the control unit e, and the outputs are connected to the inputs of the corresponding coordinate tires of the tablet; five 0 five 0 five 0 five 0 five readout zones, informational inputs of which are connected to the amplifier outputs, synchronization inputs are connected to the fifth and eleventh outputs of the control unit, the setup input is connected to the ninth output of the control unit, the first and second outputs of the generating unit are read half-areas connected to the third and fourth information inputs of the control unit , the delay element, the input of which is connected to the eighth output of the control unit, the counter, the counting input of which is connected to the output of the delay element, the setup input is connected The ninth output of the control unit, the counting direction control inputs of the counter are connected to the first and third outputs of the readout half-shaping unit, the fourth switch, whose information inputs are connected to the first second outputs of the shaping half-readout unit and to the output of the compensation pulse shaping unit, and the outputs are connected to coaxial puller inputs, with one information input of the coordinate determining unit connected to the output of the counter, another information input connected to the output house the second switch and the third informational input information i is input device. 2. The device according to claim 1, characterized in that the control unit contains a counter, the counting input of which is connected to the output of the first delay element, and the output is connected to the input of the decoder, the first output of which is connected to one input of the first and second elements AND, the second output of which connected to one input of the third element And, a pulse generator, the first output of which is connected to the other inputs of the second and third elements And-, the fourth element And, the inputs of which are connected to the third output of the decoder and the second output of the generator imp The fifth, fifth, and sixth And elements, some inputs of which are informational inputs of the block, others are connected to the third output of the decoder, and the outputs are connected to one of the inputs of the first And element, the other inputs of which are connected to the outputs of the first, third and seventh elements And the output is connected to the input of the first delay element, the second delay element, the input of which is connected to the output of the seventh And element, the inputs of which are connected to the first output of the pulse generator and the fourth output of the decoder, And elements of the group, one input which are connected to the fourth output of the decoder, the others are connected to the inverse and direct outputs of the trigger, the counting input of which is connected to the first output of the decoder, with this is the second input of the first element AND 1 0 connected to the second information input of the block, the direct output of the trigger is the first output of the block, the inverse output of the trigger — the second output of the block, the second output of the pulse generator — the third output of the block, the output of the second And element — the fourth output of the block, the output of the second delay element — the fifth the output of the block, the outputs of the AND elements of the group are the sixth and seventh outputs of the block, respectively, the output of the fourth element, AND, is the eighth output of the block, the inputs of the second OR element are connected to the second and third outputs of the decoder, -expandable ninth and eleventh block outputs tenth the output of which is connected to the output of the second OR gate. fm FIG A