SU943781A1 - Device for reading graphic data - Google Patents

Description

(, 5) DEVICE FOR READING GRAPHIC INFORMATION

one

The invention relates to computing technology, in particular, to encoding graphic information, and can be used in complexes for preparing control programs of executive devices with programmed control, as well as in processing systems for meteorological, cartographic and other graphic information.

A device for reading graphic information is known comprising a tablet with coordinate tires connected via a first switch with counter outputs, two AND elements, a pulse generator, a coordinate remover, an amplifier, a second switch, a one-shot and a control trigger.

The disadvantage of such a device is low reliability.

The closest to the proposed technical essence and the achieved effect is a device containing a tablet with coordinate

tires connected through the polling unit with the converter of the pulse code, the second counters, the puller coordinates, amplifier, pulse generator and two schemes.

The disadvantage of this device is that when reading each tablet tire it is interrogated many times, which takes considerable time, as a result of which the speed of the device is low.

The purpose of the invention is to increase the speed of the device.

Claims (1)

The goal is achieved by the fact that the device for reading graphic information contains. a tablet made in the form of a system of two cross-orthogonal coordinate buses connected to the output of a switch, one input of which is connected to a pulse generator, and the other connected to a pulse driver, an amplifier connected to the output of a coordinate remover, elements And groups, one of which inputs are connected to a pulse generator and the others are connected to the first and second meters, respectively, while the input of the first counter is connected to the output of the pulse generator, the first element I is entered, one input of which is connected to Lem, and the output is connected to the input of the second counter, the OR element, the inputs of which are connected to the outputs of elements AND of the group, the first trigger, the inputs of which are connected to the outputs of the amplifier and the element OR, and the outputs are connected to another input of the first element AND and the inputs of counters, and sequentially connected second trigger, whose inputs are co; There are 11 elements with a group I element and an amplifier output, the second element I, the other input of which is connected to the pulse generator, and the third element I, the other input of which is connected to one output of the first trigger, and the output is connected to the pulse shaper. device schema. The device includes a tablet 1, made in the form of a system of two mutually orthogonal coordinate buses, switch 2, shaper 3 pulses, converting code into a pulse sequence, coordinate remover amplifier 5, first 6 and second 7 counters, elements 8 and 9 of the group, element OR 10, the first 11 and second 12 triggers, the generator of 13 pulses, the first lA, the second 15 and the third 16 elements And the device works as follows. The triggers 11 and 12 are in a single state, and the frequency from the generator 13 pulses through the open elements 15 and 16 enters the input of the shaper 3 which sequentially excites the switch 2 through the pulse generator of the generator 13 one time. In this case, the counters 7 and 6 are held by the installation inputs in the Rnoulevo state by the potential from a single arm of the trigger 11. Elements And 8, 9 and 1 are closed. The signal from the excited coordinate bus, above which the coordinate remover A is located, goes to the amplifier 5 and from it to the zero inputs of the flip-flops 11 and 12 and the first input of the And 1 element. The triggers 11 and 12 are set to the zero state, and the And 15 and 16 are locked, prohibiting the passage of signals into the imaging unit 3, and the AND element opens, allowing the signals from amplifier 5 to pass to the counting input of the second counter 7; Switch 2, gated with signals from the generator output 13, continues to excite one of the coordinate buses, whose number corresponds to exists number generator 3- filled Since the first flip-flop 11 is in zero state with setting inputs of counters 6 and 7 cN t potential, supporting them in the initial state and they are. work in recalculation mode. The counting input of the first counter 6 receives a signal from the pulse generator 13, and the counting input of the second counter 7 through the element 1 receives the signal of the same frequency from the output of the amplifier 5. When the counter 7 counts the number of excitations of the selected bus, the signal from the gated element 9 through the element OR 10 sets the trigger 11 to the initial state in which the counters 6 and 7 are set to zero. In the shaper 3, the coordinate code corresponding to the tire number above which the coordinate remover is located is already fixed. If the excitation signal is a disturbance, when the first counter 6 is shown exceeding a certain threshold value, the signal from the output of the And 8 element sets trigger 12, the output of the element OR 10 is the trigger 11 to the initial unit state, and the process of successive excitation of the coordinate tires continues until the appearance of new pick-up signals. Thus, the proposed invention allows to ensure reliable operation of the device due to multiple excitation of the coordinate bus, from which the pickup signal is obtained and the counting of these signals on the counter, as well as significantly increase the speed. The invention The device for reading graphic information containing a tablet made in the form of a system of two