SU813481A1 - Device for reading-out graphic information from cards - Google Patents

Description

one

The invention relates to automation and computing, in particular to devices for reading graphic information with its subsequent processing on a computer.

A device for reading graphical information is contained, containing sequentially SS-; dininnye Photomultipliers, amplifiers, keys connected to switches, drivers, registers and memory blocks l.

The disadvantage of this device is its low accuracy.

The closest in technical essence and the achieved result to the proposed is a device containing amplifiers connected to photomultipliers and corresponding keys, the outputs of which are connected to a threshold signal conditioner connected to a decoder 2.

Its disadvantage lies in the low reliability of reading.

The purpose of the invention is to increase read reliability.

The goal is achieved by the fact that the device contains an amplitude selector, the inputs of which are connected to

amplifiers, and the outputs are connected to the inputs of the corresponding keys, and the amplitude selector contains a decoder connected to the first comparison elements and one inputs of the first AND elements, the other inputs of which are connected to the second comparison elements, and the outputs

0 And elements connected to the third comparison elements and to the first and second signal distributors.

FIG. 1 is a block diagram of the device; in fig. 2 - constructive execution of the amplitude selector.

The device includes an amplitude selector 1, PMT 2f6, amplifiers 7-11,

20 decoder 12, keys 13-17, threshold formers 18-22 signals, while the amplitude selector contains the decoder 23, the first 24 and 25, the second 26-29 and the third 30-33 elements of the comparison, the first distributor 34 signals, the first 35-38 and the second 39-42 elements And the second distributor 43 signals.

The device works as follows ofl30.

Optical signals are fed to the PMT inputs 2-m6, converted into electrical signals, and amplified by amplifiers 7-11. From the output of the amplifiers, the signals arrive at the information inputs of the keys 13-17 and the inputs of the amplitude selector 1 of the signals. The amplitude selector 1 determines which of the inputs received the signal with the largest amplitude and provides the enable potential to the corresponding output, while the signal with the highest amplitude passes to the output of one of the keys 13-17. If the signal has an amplitude greater than the trigger threshold threshold formers 18-22, it arrives at the input of the decoder 12. The amplitude selection of signals is implemented in three stages.

At the first stage, the signals arriving at the comparison elements 24 and 25 are compared.

Depending on which signal from the compared ones, the decoder 23 forms one of four commands for the second stage of the circuit operation: compare the signals arriving at the comparison element 29, against the comparison element 28 per comparison element 27 or 26.

These commands skip the result of the comparison at the second stage to the input of the distributor 34 by means of the first AND 35-38 elements. The distributor 34, based on the results of the comparison of the second stage, forms one of four commands for the third stage of the operation of the circuit: the signals arriving at the inputs of the comparison elements 30-33.

These commands / s skip the comparison result in the third stage to the input of the distributor 43. At the outputs of this distributor, the final result of the comparison of the signal amplitudes is formed. Now in the case of contact of the isolines, the leading edge of the signal from the second in the direction of scanning

the contour will be formed at the output of the threshold formers 18-22 at the moment when the signal from the second contour in amplitude exceeds the signal from the first, that is, the second isoline will not be skipped.

The introduction of a new unit and new constructive links can significantly improve the reliability of reading information.

Claims (2)

1. A device for reading graphic information from cards containing amplifiers connected to Lottoelectronic multipliers and corresponding keys, the outputs of which are connected to a threshold signal conditioner connected to a decoder, characterized in that it contains an amplitude selector in order to increase the reliability of reading. , the inputs of which are connected to amplifiers, and the outputs are connected to the inputs of the corresponding keys. 2. A device according to claim 1, characterized in that the amplitude selector comprises a decoder connected to the first comparison elements and one inputs of the first AND elements, the other inputs of which are connected to the second comparison elements, and the outputs connected to the first signal distributor, and the second AND elements connected to the third elements of the comparison and to the first and second signal distributors. Sources of information taken into account in the examination 1. GDR patent number 94080, cl. 42 m 69/00, published 1972. 2. Japanese Patent No. 49-25777, cl. 97 (7) In 62, published. 1974 (prototype).