SU1160459A1 - Information reception device - Google Patents

Description

The invention relates to telemechanics and can be used in data reception devices by transmitting a binary code at random times.

The purpose of the invention is to improve the noise immunity of the device. The drawing shows a functional diagram of the devices; 9 for receiving information. /ten

Device Contains receiver 1, connected via a selector 2 unit to the first input of the second prohibition element 5, the output of which through the selector 4 of the information attribute is connected to the first input of the trigger 5, clock generator b, counter 7, nepBt element I 8, second element And 9, the first element 10 of the ban, register 11, the generator of 20 pulses, the counter 13, the third element And 14.V

The generator 12 yushulso |, the counter L 13 And the third element And 14 form the former 6.25

The proposed device works as follows.

Information parcels intended for the reception of a device by a device, and the length of the bits that are divided into two groups. The first recognition and synchronization group contains k bits, the second group — information — contains n bits. The first group is a code combination that satisfies two requirements: the probability of occurrence of such a combination among noises on the receiver's frequency during pauses in the operation of the transmitting complex should be rather small; Such a combination should not occur in the second group of bits. Fulfilling the second requirement reduces the likelihood of a false 45 sync in case of a failure in the reception of the identification and synchronization group. In the initial position, trigger 5 is in the Log state. A. A low logic level from the output 50 of the trigger 5 holds the counter 7 pulses and the counter 13 pulses of the former 6 clock pulses at zero and allows the passage of the pulses received from the receiver .55 ka 1 through the selector 2 code. Nak units in the selector 4 feature information. If a recognition and synchronization combination is received at the input of the selector 4, an Impulse is formed at its output, the leading edge of which coincides with the end of the combination. On the falling edge of this pulse, 5 is switched to the Jlor state. 1 and allows the counting of counters 7 and 13 pulses. At the same time, the prohibition element 3 closes and the input sequence no longer arrives at the input of the selector 4, Counter 13 counts the pulses of the generator 12 pulses, the frequency of which is Fr 2 such that their follow-up period would be 2 times the period of the pulses of the parcel tf

Ch & iso m should be large enough so that the non-phase of the pulses of the pulse generator of the pulse has no significant effect on the position of the clock pulse. At the same time, at the output of the element 14, a clock duration is formed and the position of which depends; From what you see the water meter 13 connected to the inputs of the element And 14, the position of the clock 1pulse is selected in the middle, the least prone to distortion of the information pulse

Clock pulses pass through the prohibition element 10 to the clock input of the shift register 11 and input information from the selector 2 to it, since at that time the inverse input of the prohibition element 10 is operated with a low logic level from the output of the And 8 element. When the code M of the number 1 of 4 QoS bits on all its outputs, connected to the inputs of the It 8 element, high logic levels are formed. Pr (and a high level from the AND 8 element closes the 1O inhibit element and opens the electric 1yon AND 9. Next (n + O th clock pulse4 pulse passes through the element 9 to the bus) The end of the package and the falling edge switches trigger 5 to the Log state. A. The device is reset and ready to receive the next parcel.

The selector 4 feature information in the proposed device prednazE 1160459 I

The procedure for identifying against the background of noise is torn using

sync sprinkle, front to write to shift register

vkfovmk spits formed from

with: understanding of. (The structure of this premise is in an autonomous generator and synchronous,

It depends on the statistics of J: Eiruems and the beginning of information properties, all the way |, OP-cuts, which eliminates the correlation of the standard, 4. Mobility of the O1 number of the new information shear Enhancement;)).

lagayim device for receiving-in interference.

Claims (1)

DEVICE FOR RECEIVING INFORMATION, containing a receiver, the output of which is connected to the first input of the register through the unit selector, the first counter, the outputs of which are connected to the inputs of the first element And, the output of which is connected to the first inputs of the first element * and the second element And, In addition, in order to increase the noise immunity, a second prohibition element, an information attribute selector, a trigger, a pulse generator, a second counter and a third AND element are introduced into it, the output of the unit selector is connected to the first input of the second about the inhibit element, whose output is connected via the information sign selector to the first input of the trigger, the output of which is connected to the second input of the second inhibit element and the first inputs of the first and second counters, the output of the pulse generator is connected to the second input of the second counter, the outputs of which connected to the inputs of the third element And, the output of which is connected to the second input of the first counter, the second input of the first inhibit element and the second input of the second element And, the output of which is connected to the second input of the trigger, the output is not R- . The first prohibition element is connected to the second input of the register, the outputs of which are the outputs of the device. 1 1160459 2