SU557497A1 - Cyclic Decoder - Google Patents

Description

(54) DECODING DEVICE OF CYCLIC CODE

the input of the additional element And 23 served clock pulses. .

The decoding device works as follows o6paJOM.

In the initial state, all cells 2–9 of shift register 1 are in state 1. The code characters are sent in time through tires 18–20 of the no-zapash to the inputs connected to them of terminals 10–17. The arrival of each symbol of a decoded combination is accompanied by a clock pulse arriving at the corresponding inputs of cells 2–9 (not shown in the drawing), as a result of which information is shifted around the ring. At the same time, the clock pulses arrive at the input of the additional element And 23.

The operation of the device will be considered on the example of decoding code combination 20211012.

Upon receipt of the first character of the deduced code combination (i.e., symbol 2), a signal appears at the inputs of the elements 10, 11 and 13, podupeted to the signal signal line 18 bus 2. Therefore, as a result of information shifting around the ring on the first cycle The state 1 is only the cells 3, 4 and 6 of the shift register 1. The remaining cells 5, 7-9 go to zero.

At the second cycle, a signal appears at the inputs of the elements 12 and f6 connected to the bus 19 of the signal code O. Therefore, after the second shift of information, state I is only cell 5. When receiving the remaining six characters, code combination 1 moves around the ring. After the decoding is completed, state 1 is only cell 3.

If, for example, the bus 18 of the code signal feature 2 is broken, then, unlike the previous one (in his case, on the first, third and eighth cycles the signal appears at the output of the element ORINE 22, which, through the additional element AND 23, starts the pulse conditioner 24. The signal from the pulse driver 24 through the isolating element 25 is fed to buses 18--20 and, therefore, to the inputs of all elec tions And 10-17, providing

from the Ikformatskaya village, located in PeiMcipe with; .wig 1, one bit to the right.

Thus, in the first cycle (if the tire 18 is dead), all cells 2–9 of shift register 1 remain in state 1. On the second cycle, cells 1 and 5 are in state 1, cells 3 and 6 are in the third, and cell 7. After receiving the entire code combination in state 1, as in the previous case, only the cell3 appears.

In the case of a short circuit, any pair of tires 18-20, circuit 21 does not work, and the decoder automatically comes to the required state.

For example, when closing tires 19 and 20 to

the first clock cycle in state 1 is cells 3, 4 and 6, on the second cycle cells 5 and 7, on the third cell 6. After receiving the entire code combination, state 1 still remains cell 3.

Claims (1)

Formula invented by her and A cyclic code decoding device containing an annular shift register, each cell of which is connected to a subsequent cell through an AND element, the second input of which is connected to a corresponding bus of signal code signs, characterized in that, in order to ensure decoding when the bus signal or signal closes signs, a chain of OR-NOT elements, an additional element AND, a pulse former and an elementary switch are entered into it, while the inputs of the OR-NOT element and the output s decoupling element - coupled with tires k1r ovyh signal characteristics, and the other input of the complementary element and feeds clock pulses The sources of information taken into account prizkotertize: I. USSR Copyright Certificate No. 174840, H 03 K 13/258, 1967.