SU732932A1 - Graphical data readout device - Google Patents

Description

The invention relates to automation and computer technology, in particular to devices for reading graphic information.

A device for reading graphic information comprising a tablet with coordinate buses connected to a switch, a control unit connected to a coordinate stripper, a switch, a coordinate generation unit and a coordinate output unit connected to the coordinate formation unit [1].

However, the accuracy of such a device is not high enough.

Closest to the invention is a device containing a tablet, made in the form of a system of two mutually orthogonal coordinate buses connected to a coordinate sampling valve, a control unit whose inputs are connected to the input of the device, to a comparison unit and to a read signal generation unit connected to a coordinate remover, an exact coordinate reference counter and a comparison unit, and the control unit outputs are connected to coordinate bus interrogation gates and to a coarse coordinate reference counter, digital-to-analog conversion azovatel connected to meter precise reference coordinates and a comparing unit, dispensing valves coordinates, inputs of which are connected with counters coarse and fine reference coordinates and a comparing unit, and outputs connected to the output device and the decoder [2].

But such a device has a complex structure.

The purpose of the invention is to simplify the device.

This goal is achieved by the fact that in it the inputs of the gates for interrogating the coordinate buses are connected to the output of the decoder connected to the coarse coordinate counter.

The drawing shows a block diagram of a device.

The device includes a tablet 1 with coordinate buses, valves 2, 3 polling coordinates, control unit 4, counter 5 operations, decoder 6 operations, valves 7-10 operations, ₅ valve 11, trigger 12, pulse generator 13, the first element OR 14 , communication gate 15, second OR element 16, reset valve 17, read signal generation block 18 containing 10 amplifier 19 and driver 20, digital-to-analog converter 21, coordinate output valves 22, coarse 23 and accurate 24 reference counters, comparison unit 25 puller 2 6 ¹⁵

Coordinate, decoder 27 and input 28 of the device.

The device operates as follows.

Simultaneously with the puller ²⁰ 26 pressing the selected point, a start signal is input to input 28. In this case, the trigger 12 of block 4 is set to a single state, and the pulses of the pulse generator 13 through the valve 11 pass to the pulse inputs of the valves 7-10. Since the operation counter 5 is currently in the zero state, the decoder 6 opens the valve 7, from the output of which the clock pulses start the counter 2 3, which through the decoder 27 valves 2 controls the alternate one-time excitation of the corresponding coordinate bus X. Sequential tire counting on the counter 27 is stopped when the bus is located in the sensitivity zone of the puller 26, which gives a signal to the amplifier 19 of the block 18. From here, having passed the former 20 and the communication valve 15 open by the output of the first operation of the decoder 6, the signal is fed to the counting input of the counter 5 operations and switches it to the position of the second operation (tire counting stops). In this case, valve 8 opens, issuing signals only to the polling gates 2, of which only one is open by the decoder 27, since in the second operation, clock pulses are supplied to the input of the counter 23 from the first element OR 14, and a sequence of pulses begins to arrive at the selected one bus interrogation (excitement). The pulses of this sequence induce signals in the puller 26, which after the former 20 of the block 18 are fed to the counting input of the counter 24 of the exact counting, and after the amplifier 19 to the input of the block 25, the second input of which is supplied with voltage from the digital-to-analog converter 21. Moreover, for each clock pulse the amplitude of the induced signal is compared with an alternating reference voltage at the output of the converter 21, the digital equivalent of which is stored on the counter 24 of the exact coordinate reference. This process continues until the amplitude of the induced signal and the voltage at the output of the converter 21 coincide (with an error in the quantization step). At the same time, block 25 generates a signal through which the code is issued through valves 22 (cleaning the counters 23 and 24) and switching the counter 5 to the next third operation - rough counting along the axis. V, which is performed similarly with the participation of the corresponding valves 3 of the (common) decoder 27, controlled by the counter 2 3 with the additional use of the reset valve 17, which passes the signal from the block 25 in the fourth operation to the zero input of the control trigger 12, stopping the arrival of the pulses of the generator 13 through the valve 11. In this case, the measurement cycle of both coordinates is terminated.

The introduction of new structural relationships has significantly simplified the design of the device.

Claims (1)

The device includes plans 1 with coordinate tires, gates 2, 3 coordinate polling, control unit 4, which counts 5 operations, a decoder of operations, valves 7-1O of the control valve, valve 11, trigger 12, pulse generator 13, first element OR 14 , valve 15 connection, the second element of IL AND 1. reset valve 17, unit 18 g of readout signals containing amplifier 19 and driver 2O, digital-to-analog converter 21, valve 22 for outputting twofolds, coarse 23 and exact 24 reference points, unit 25 comparison, remover 26 Coordinates, decoder 27 and input 28 devices. The device works in the following way. I clicked the puller with the puller 26 on the selected point and the start signal is sent to the input 28. In this case, the trigger 12 of the Block 4 5 is set to 1x: in the switching state, and the pulses of the generator 13 pulses through the gate 11 pass through 1-1 pulse inputs of the gates 7-10. Since the counting of 5 operations to the yes-EH moment is in the zero state, then the decoder 6 opens the valve 7, from the output of which the clock pulses, start the counter 23, which through the decoder 27 and the 2 valves 2 controls the alternate one-time excitation of the corresponding coordinate area X . The sequential counting of the meter 27 stops upon the initiation of a field, located in the sensitivity zone of the remnant 26, which gives a signal to the amplifier 19 of the block 18. Hence the mold 20 and the communication gate 15 opened by the output of the first decoder operation 6, The signal arrives at the counting input of the counter 5 operations and switches it to the position of the second operation (the counting of tires is missed). At the same time, the valve 8, which signals only 2 polls, is open, and only one is opened to the decoder 27, since in the second operation the clock pulses to the input of counter 2 from the first Els-Shkta OR 14 are not received, and the iraray starts to flow to the selected one sequence of polling pulses (excited w). I induce pulses of this sequence in the puller 26 of the sgsapu, which after forming the 20 of the bass 18, nip the counting input of the counter 24 of the counting point, and after the amplifier 19 the input of the unit 25, the input of which is supplied from the digital-analogue phantom 21. At each clock pulse the amplitude of the inductive signal is compared with the pem-shm reference voltage at the output of the converter 21, the digital equivalent of which is stored on c4eT4iffie 24 of the exact reference coordinates. This process continues until the quantization amplitude of the induced signal and voltage at the output of the converter 21 coincides (with an error of the quantization step). At the same time, the block 25 generates a signal that is used to issue a code through the valves 22 (cleaning the counters 23 and 24) and switching the counter 5 for the next third operation - rough counting along the axis. V, which is performed similarly with the pavement of the corresponding valves 3 (common) decoder 27, controlled by counter 23 with the additional use of vent 17, which passes the signal from block 25 in the fourth operation to the zero input of the control trigger 12 pulse generator 13 through valve 11. In this case, the measurement cycle of both coordinates is terminated. The introduction of new constructive links has made it possible to significantly simplify the design of the device. Claim device A device for reading graphical information containing a plaet made in the whole system: two mutually orthogonal coordinate women connected to coordinate interrogation valves, a control unit whose inputs are connected to the input of the device, to a comparator and to a reading signal generating unit connected to the puller of coordinates, the counter of the exact reference of the coordinates and with the comparison unit, and the vyzyudy of the control unit are connected to the coordinate interrogation valves and with the coarse counter of the coordinates, ifroanalogovy preobraaovatbtsh tyudklkUChenny to meter the exact coordinates of reference and comparison unit, dispensing valves coordinates, inputs of which are connected with counters coarse and fine reference coordinates and a comparing unit outputs connected Ja r732932 j6 to the gzykhod device, and the decoder, about t - sources and formament-g, l and h ya e with the fact that, for the purpose taken into account during the examination simplify the device, in inputs BGHTH-1. Patent of Yaposhi No. 48-23862, lei survey of coordinate lujni connections1. 97 (7) B 64, published. 1973. with the output of the decoder, connect 2, Apto | to; some evidence of the USSR to the count of a rough reference number 46G522, kl. SOB K 11/00, 1975 nat {gfototii /.