SU1488784A1 - Device for comparing codes - Google Patents

Description

The invention relates to computing and can be used

Used in devices of automation, remote control and communication. The aim of the invention is to expand the scope of application due to the possibility of allocating a given sequence of codes. The device contains a counter 3, the element And 4, the memory block 5 and the comparison circuit 6. The device compares the analyzed code sequence with the specified memory recorded in memory 5 when they are sequentially sampled at the addresses specified by the counter 3, and if these sequences coincide, it generates a signal for the device to end. 1 il. with

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1488784

The invention relates to computing and can be used in devices of automation, remote control and communication.

The purpose of the invention is the expansion of the scope due to the possibility of the selection of a given sequence of codes.

The drawing shows the functional scheme of the proposed device.

The device contains the inputs 1 of the initial installation, the inputs 2 of the code sequence, the counter 3, the element 4, the memory block 5, the comparison circuit 6 and the output 7 of the end of operation of the device. The element 4 inputs are connected to the counter 3 outputs according to the binary code of the number of characters in the selected sequence: if the binary code of the binary code contains 1 (0), then the ίth input of the AND 4 element is connected to direct (inverse) output of the ί-th trigger trigger 3.

The device works as follows.

In the initial state, the counter 3 is set to zero, from the inputs 1 of the initial installation to the inputs of the upper digits of the address of the memory block 5 constant signals are supplied corresponding to the initial address of the array of character codes of a given sequence stored in the memory block 5. With the arrival of the address of the starting address from the memory block 5, the code of the first character of the selected sequence is read, which comes from the outputs of the memory block to the first group of inputs of the comparison circuit 6. The second group of inputs of the comparison circuit 6 at this time comes to the inputs 2 of the character code of the analyzed sequence. If the codes match, a signal is output to the equality output of the comparison circuit 6, which enters the counting input of counter 3, resulting in an increase in the counter value by one and at the next time the next character code is read from the next in order cell of memory block 5. This code from the outputs of memory block 5 again goes to the first group of inputs

comparison circuit 6, on the second group of inputs of which input 2 receives the code of the next character from the sequence being analyzed. In the case of coincidence of codes, the value of the counter 3, and then, increases again.

In case of a mismatch between the code of the next character of the analyzed sequence and the code of the character read from the memory block, a signal arises at the output of the inequality of the comparison circuit 6, which is fed to the input

15 sets the counter to zero, with the result that the counter 3 is set to zero and the whole process repeats. This happens as long as the number of matching codes

The 20 characters of the analyzed sequence stored in the memory block will not be equal to the number of characters of the specified sequence.

In this case, all the inputs of the AND 4 element from the outputs of counter 3 receive single signals, as a result, from the output of the element 4, a signal is output to the output 7 of the device, which indicates the end of the device operation.

Claims (1)

Claim A device for comparing codes 35 containing a memory block, a comparison circuit, a counter and an AND element, the outputs of the memory block are connected to the first group of inputs of the comparison circuit, the second group of inputs of which is connected to the inputs of the code sequence, and the equality output of the comparison circuit is connected to the counter input of the counter, differing by that, in order to expand the application area by ensuring that a given sequence of codes can be extracted, the inequality output of the comparison circuit is connected to the installation input to the "0" counter, the discharge outputs of which are connected to the inputs of the And element and the inputs of the lower digits of the address of the memory block, the inputs of the higher digits of the address of which are connected to the inputs of the initial installation of the device, the output of the element And is the output of the end of the device.