SU538377A1 - Graphic reading device - Google Patents

Description

one

The invention relates to the field of computer technology and can be used in the automatic processing of graphic information on a computer.

Known reading devices are known.

graphic information.

One of the known devices comprises a scanner unit, a video amplifier, a tape mechanism, a pulse generator, an ordinate measurement unit, and a flj control unit.

The closest in essence to this invention is a device for reading graphic information containing a scanner connected to a video amplifier, a clock pulse generator, a tape mechanism and one of the inputs of a module forming a current ordinate value, the other input of which is connected - what to the trigger connected to the generator of clock pulses, the input unit of ordinates and the logical element And 2j.

However, this device is not sufficiently reliable.

The purpose of the invention is to increase the reliability of the device. The goal is achieved by the fact that the proposed device contains an ordinate recording unit connected to an ordinate input unit, a module for forming a current ordinate value module and through a logical element I with a scanning unit, a memory unit connected to an ordinate recording unit, and a comparator unit, outputs which are connected to the memory blocks and the phrasing module of the current value of the ordinate, and the output - to the logical element I.

The drawing shows the block diagram of the device.

The device consists of a scanner 1, a tape mechanism 2, a clock pulse generator 3, a video amplifier 4, a trigger 5, a unit for forming a module of the current value of ordinate 6, an input unit for ordinates 7 and a node 8 for setting a signal perception zone of the graph. The node 8 comprises a comparison unit 9, a memory block 10, an ordinates recording unit 11 and an AND 12 logic element.

The nodes and units of the device are made mainly on the basis of integrated circuits.

The device works as follows.

After switching on the scanner 1, the clock pulse generator 3 generates synchronizing signals for the device, the tape mechanism 2 is turned off, the code corresponding to the expected ordinate value of the first point of the graph line is entered using block 7 and the ordinate recorder 11 into the memory block

10. At the same time, the comparison unit 9 with each scan cycle generates a signal corresponding to the width of the numerical zone. This zone is located symmetrically with respect to the estimated value of the first ordinate point of the graph recorded in the memory block 10.

From the control panel of the device, using the button, a Start signal is given, which allows the tape carrier to move through during the return path of the scanning beam, and allows to record the values of the ordinate points of the graph in block 10. The values of the ordinates are recorded at the moments of the output signal element and 1.2 in block

11. In the first scan cycle, counting from the moment when the Start signal was given, the pulse from video amplifier 4, from the first intersection point of the beam to the line of the graph, goes to one of the inputs of the element 12, to the other input of which a signal comes from the output of the comparison unit 9. The element And 12 is triggered, and its signal goes to block 11. The exact value of the ordinate of the first point of the graph, which is stored in it until the value of the ordinate of the second point of the graph, etc., is recorded in block 10 from the output of block 6.

The introduction of new units and new constructive links has made it possible to increase the reliability of the device operation by 35% –4% compared with the known devices.

Claims (2)

1.Patent of England No. 1102838, Q 1A, February 14, 68 2. USSR author's certificate №41992 Cl. Q06K 11/00, 08/12/74 Output