SU1608635A1 - Data input device - Google Patents

Abstract

The invention relates to automation and computing and can be used in microprocessor and display technology. The purpose of the invention is to expand the field of application of the device by identifying the source of information. The device contains a series-connected counter 1, a decoder 2, a switch 3, a block 4 of elements OR, a block 5 of comparison, an element 6 of the prohibition, trigger 7, element 8 AND, block 9 of elements AND, counter 12, element 15 of delay. The device can be used in systems with inadmissibility of unauthorized access to the database due to its destruction of software input. 1 il.

Description

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The invention relates to anatomics and computing, and in particular to input devices, and can be used in microprocessor and display technology.

The purpose of the invention is to expand the field of application of the device by identifying the source of information.

The drawing shows the structure of the device.

The device contains Counter 1, decoder 2, switch 3, block 4 of elements OR, block 5 of comparison, prohibition element 6, trigger 7, element AND 8, block 9 of elements AND, information input 10 and output 11 of the device, a counter. 12, the synchronous input 13 and the clock input 14 of the device, the delay element 15, the installation input 16 and the synchronous output 17 of the device.

Before starting the operation, the elements of the switch 3 are set to the corresponding index of the subscriber. In this case, all elements of the device memory are set to the zero state.

The device works as follows.

Information from a particular subscriber is entered at information input 10, but at output 11 it can only be received if there is a enable signal. output element And 8. This signal is formed as follows.

In accordance with the cipher dialed in switch 3, a predetermined number of pulse series must be sent to the clock input of the device, for example, telephone dial tone signals converted into square pulses, which are summed by counter 12. At the end of each series of pulses, an impulse generated , for example, from. signal disconnect phone. If at this moment in block 5 there is no comparison of the reference (from block 4) and the current (from counter G2) codes, then an error will be written to trigger 7 from element 6, saved until the subscriber identification operation is completed, and the block to give signal 9 to no information is provided. After a time determined by element 15, trigger 7 returns to its original state. If the number of pulses in each series on input 14 corresponds to the code dialed by the elements of switch 3, and trigger 7 will not

if there is no error, then a single signal level from the overflow output of counter 1 to block 9 allows information to be output to output 11.

5After resetting the counter 12 state

counter 1 is increased by one, which changes one switch code 3 to another by supplying an enable signal from the decoder 2 to the corresponding

10 group of coding elements of the switch 3.

The effectiveness of this device due to the exclusion of the consequences of the destruction of the database and cost reduction

15 to recover information when it is unauthorized change.

Claims (1)

The invention is a device for inputting information containing a first counter, whose information outputs are connected to the corresponding inputs of the decoder, a block of OR elements, a trigger, the zero output of which is connected to one input 5 of the AND element, and a block of AND elements, whose information input is The corresponding input of the device, characterized in that, in order to expand the field of application of the device by identifying the source of information, a second counter has been entered into it, the clock input of which is the corresponding The unit's input, the comparison unit, the first and second inputs of which are connected respectively to the outputs of the block of the IL AND elements and the second counter, the prohibition element whose output is connected to the single trigger input, the control input to the output of the comparison block, and information input 0 is the synchronous input of the device, connected to the installation input of the second counter and the clock input of the first counter, the installation input of which is the corresponding input of the device, 5 switch, the inputs of which are connected to the corresponding outputs of the decoder, and outputs to the corresponding inputs of the OR block, and a delay element whose output is connected to the zero trigger input 50, and an input to the first counter overflow output connected to another input of the And element whose output is connected to the synchronous input. the device and the control input of the AND block whose output 55 is the information output of the device.