SU796893A1 - Information receiving device - Google Patents

Description

together with the input of the synchronization unit is connected to the input of the device 2.

The disadvantage of the device is relatively low resistance to noise, since the Heming code is used for transmitting information, which allows the detection of one or two character failures in the code, and three, four failures, etc. no characters are found. Moreover, undetectable failures can be both in the lower and higher bits of the information code, which leads to large errors.

The purpose of the device is to increase its noise immunity.

The goal is achieved by the fact that a subtraction unit, a multiplication unit, a maximum allocation unit, a comparison unit, an OR element and a counter, the memory unit output are connected to the first input of the subtraction unit, the output of which is connected to the first input, are entered into a device for receiving information of the comparison unit and with the first input of the allocation unit maxi 1 "of the mind, the output of which is connected to the first input of the multiplication unit, the output of which is connected to the second input of the comparison unit, the first output of the comparison unit is connected to the third input And the first input of the counter, the output of which is connected to the second input of the multiplication unit, the second one, the output of the comparison terminal is connected to the first input of the OR element, the output of which is connected to the second input of the counter, the second output of which is connected to the second input of the maximum allocation unit, the outputs of the distributor with the second inputs of the subtraction units, the third inputs of which are combined and connected to the output of the intermediate memory block, the third output of the decoder is connected to the second inputs of the elements. OR information channels.

Therefore, faults that are not detected by the anti-interference code and whose level is greater than the detection level will not be written to the memory block.

The drawing shows a block diagram of the device.

The device for receiving information contains a synchronization unit 1, a distributor 2, a decoder 3, an intermediate memory block 4, and also contains in each information channel 5 a subtraction unit b, a maximum extraction unit 7, a multiplication unit 8, a comparison unit 9, element 10 OR, reversible counter 11, element 12 I, digital-to-analog converter 13, memory block 4, device input 15, device outputs 16. The synchronization unit 1 serves to allocate clock pulses and ensure synchronous operation of the transmitter distributor 2 and the receiver distributor.

side (not shown). The distributor 2 forms, at its outputs, a controlling single pulse, successively shifting in accordance with the clock frequency from synchronization unit 1. The decoder 3 checks the received information code and detects layers of one and two characters due to the redundancy of the code. When a fault is detected, a single pulse is generated at the second (control) output of the decoder, if there is no failure, or it is not detected (since three or more characters are knocked down), then signal 1 is generated at the third (control) output. At the fifth (informational) output of the decoder 3, a reference code is formed. The intermediate memory unit 4 is designed to quickly store the reference code (for one clock cycle). The memory unit 14 is designed to store the code at its input, and the memorization time corresponds to signal 1 at its first (control) input. The subtraction unit b performs subtraction of the codes at its two inputs and generates a difference code at its output in the presence of an enable signal 1 at its second (control) input. The multiplication unit 8 performs the operation of multiplying the input codes and forms the result at its output. Comparison unit 9 is designed to compare at its two inputs, if there is a enable signal 1 at its third (control) input, and if the code at its first second input (from block 8) is greater (less) than the code at its first input (from block 6) then the signal 1 (O) is formed at its first output, and the second output is inverse to the first one. In the case of signal O on the control input on both outputs. The element OR 10 and the element and 12 perform the corresponding logical operations. The up / down counter 11 is intended to count the number of units received at the first input in the forward code (i.e., for summation) and in the inverse code (subtraction) of the pulses received at the second input. At the first output of the counter 11, a summation (subtraction) result code is generated. The initial state of the counter must correspond to one. In addition, the second output of the counter 11 was formed

Route signal

the counter code corresponds to one, otherwise - O. The digital-to-analog converter 13 serves to form an analog voltage at the output, corresponding to the code at the input.

A device for receiving information operates as follows.

From the input information B of block 1, clock pulses are generated that control the operation of the distributor 2, and in the decoder 3 a received jamming code is checked, with the help of which one or two characters are detected. One of the decoder 3 detects a failure. a locking signal is generated which is fed to the input of all elements AND 12, due to which the writing of the code of this reference in block 14 will not occur. In addition, a control signal 1 is formed at the other output of the decoder 3, which will pass through the corresponding element OR 10 to the second input of the reversible counter 11, the latter will change its state by one and on the control (second) input of the block 7, a inhibit signal 1 is generated (or is saved). If no failure is detected in decoder 3, then an enable signal 1 is generated at its second control output, a signal O is generated at the first control output, and the inputs of all blocks 4 and 6. In block 6 The count on which the countdown arrived (block 6 and 9 are gated with the signals from the distributor 2), the difference between the arrivals, the count and the previous one (the latter is stored in the memory of this block 5) is determined:. The code corresponding to this difference is fed to the input of block 9 of this channel and is compared with the allowable difference, which is calculated in block 8 as uXjj nuXfn, where is the maximum signal change per sampling clock at zero extrapolation, n is the number of sample failures, ziXv "Is calculated in block 7 separately for each channel, since this value depends on the properties of the telemetry signal, and xyyy, is determined only from those signal increments per sampling cycle that correspond to the difference of two adjacent received signals accounts, in other cases at control unit input inhibit signal 7 A. The value must be multiplied by n so as to not reject Nesbit counting when n consecutive samples downed. In addition, after each received reference, the state of counter 11 decreases by one. If LH:, - & X, then the second output of block -9 generates a signal 1, which through the element OR 10 enters the input of the reversible counter 11, the latter changes its state to one, and the first output of block 9 forms a inhibitory signal O which closes the element 12 I, as a result of which the reference code will not be written in block 5, i.e three or more characters are detected in the reference code. If l. The signal i is generated at the second output of block 9, and the permitting signal 1 is generated at the first output, thereby recording the information in block 6 and the output code of the reversible counter 11 decreases by one.

Thus, in the proposed mouth,. One of the two bits of the reference code is detected (due to the redundant code) and three or more bits are detected, the weight of which is greater than AH & device immunity is enhanced.

Claims (2)

1.BarsukovF.I. Russkhnov Yu.B. Elements and nodes RTS. M., Energie, 1973, p. 17 2. Kornilov B.A. and others. Multichannel code-pulse telemetric device MKG-2. - Instruments and control systems, 1972, No. 11 (prototype).