SU1317679A1 - Reception start-stop device - Google Patents

Abstract

Invention m. It is used in terminal telegraph devices and provides increased reliability of reception. The device contains a receiving unit 1, defining r-2, a key 3, differentiating blocks 4, 10 and 12, a start-stop valve 5, a driver of 6 trigger pulses, a threshold block 7, counters (C) 8 and 18, a start-stop trigger (T) 9, inverter 11, T 13, 17, 20, selectors 14 and 19 coincidence, EL-OR 15, EL-delay 16. Under the influence of the polarity reversal at the output of OR-15, generated by blocks 10 and 12, appear within a single code combination e-mails up to the moments of registration, and C 18 and T 17 work. T 17 works from any kind of polarity and is prepared Ive selector 19 to work. C 18 counts the number of changes in the polarities of the signal, according to the results, up to. If the number is even, then the output of the C 18 will be a ban signal. If the number is odd, then the outputs of the C 18 and T 17 will be resolving potentials. The registration pulses pass through the selector 19 to the input of the T 20, which forms the erase signal, which indicates the presence of crushing distortions within the limits of single elements, the start-stop code combination. Registration pulses, after the time determined by el-16, expires, resetting C 18 and T 17 to the initial state. 1 il. Erasing i (L 00 (E5 WITH

Description

one . 13 The invention relates to telegraph communication and can be used in terminal telegraph devices.

The purpose of the invention is to increase the reliability of reception.

The drawing shows a structural electrical circuit of the proposed start-stop device.

The receiving start / stop device contains a receiving unit 1, a master oscillator 2, a key 3, a second differentiating unit 4, a start / stop distributor 5, a driver 6 for triggering pulses, a threshold unit 7, a first counter 8, a start / stop trigger 9, the first differentiating unit 10, an inverter 11, the third differentiating unit 12, the first trigger 13, the first match selector 14, the element OR 15, the delay element 16, the second trigger 17, the second counter 18, the second match selector 19, the third trigger 20.

The device works as follows.

The signal from the communication channel enters the receiving unit 1, where its level matching with the device takes place.

The start type transition, which appears at the output of the receiving unit 1, starts the start / stop trigger 9, sets it to the single state. This opens the key 3 and the clock pulses from the output of the master oscillator 2 arrive at the input of the start and stop distributor 5. Differentiating block 4 on the front of the signal from the output of the start-stop trigger 9, generates an impulse arriving at the input of the driver 6 trigger pulses (since the output of the threshold block 7 receives the signal O) and starts the start-up distributor 5, which echenie start-stop cycle generates a series of pulses a, b NA, which is produced by the unit cells registration is 50 ° starting transition and all

code combination. Under the influence of a series of pulses a and b, the trigger 13 generates the forbidden zones, within which the polarity of the signal should not change during the in-phase operation of the start-stop distributor 5. A series of pulses that pass the delay element 16, controls the operation of the counter 18, the trigger 17, and the trigger 20.

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subsequent transitions. At the same time, counter 8 has enough pulses for triggering threshold block 7. Due to distortion of single elements, it is not known which of the pulses caught at the time of the resolving potential; 1la- from trigger 13 to the match selector 14 is a true starting transition, therefore

In the proposed device, an analysis is made of the state of the received single elements of the start-stop code combination by the presence of significant recovery points (MIT), which appear due to splitting of the signal in the interval from the beginning of the unit interval to the moment of registration.

If signal splitting occurs before registration, and their duration is such that they end

Since after the time of registration, the accepted code combination is more likely to be registered incorrectly. In this case, the code combination is erased and is not provided to the consumer, and in the presence of feedback, it is asked again.

In the case of common-mode operation of the start-stop distributor 5 and in the absence of ZMV-in the forbidden zones arising due to splitting of the signal, the phase tuning is not performed and the received code combination is not erased.

If the polarity of the signal (transitions such as the starting one) occurs during the forbidden zone produced by trigger 13, then an output appears at the output of the match selector 14 through differentiating unit 10, which goes to counter 8. Since the probability of distortion (fragmentation ) several single elements in one start-stop

combinations is small, then counter 8 for

the start / stop cycle does not count enough pulses to trigger the threshold unit 7 and adjust the phase of the start / stop distributor 5 not

occurs, at the end of the cycle, the start-stop distributor 5 sets the start-stop trigger 9 and the counter 8 to zero.

Since the stop unit is a single element, it has a double duration, when the start-stop distributor 5 is asynchronous, the selector switch 14 will work as if from a true5

subsequent transitions. At the same time, counter 8 counts Enough pulses for triggering threshold block 7. Due to the distortion of single elements, it is not known which of the pulses caught at the time of the resolving potential; 1la from the trigger 13 to the match selector 14 is a true starting transition, therefore the threshold block 7 through the driver 6 trigger pulses will make an adjustment of the start-stop distributor 5 to two starters.

Under the influence of the polarity reversal (ZMV) interference at the output of the OR 15 element, formed by differentiation by blocks 10 and 12, appear within the single elements of the code combination prior to the registration moments and the counter 18 and the trigger 17 of the device are triggered.

Trigger 17 is triggered by any kind of polarity change and prepares the selector 19 for matches. Counter 18 counts the number of polarity changes of the signal appearing before the recording moments, and if the number of polarity changes is even, then the output of the counter will be a prohibition signal (zero potential ), which prevents the operation of the selector 19 matches.

If the number of polar changes is odd, then at the outputs of the counter 18 and the trigger 17 there will be resolving potentials. The impulses of the series c pass through the selector 19 matches to the input of the trigger 20, which generates the erase signal, which indicates the presence of distortions of crushing within the single elements, the start-stop CODE combination.

Registration pulses (series c) after the time determined by delay element 16 elapses, the counter 18 and trigger 17 are reset to their initial state, which prepares them for the analysis of the next element by a code combination.

At the end of the start-stop cycle, the start-stop valve 5 sets the trigger 20 to its initial state.

Claims (1)

Claims of the invention A start / stop receiver comprising a series-connected first match selector, a first counter, a threshold unit and a trigger pulse shaper, successively connected the receiver unit, and the first differentiating unit. VNIKSHI Order 2437/56 Random polygons pr-e, Uzhgorod, st. Project, 4 the output of which is connected to the first input of the first match selector, start-stop trigger, the output of which is connected to the input of the second differentiating unit, the output of which is connected to another input of the trigger pulse generator, serially connected to the master oscillator, a key, which other input is connected to the output of the start-stop trigger and start-stop distributor , the second input of which is connected to the output of the driver trigger pulses, and the output of the n-th bit of the start-stop distributor is connected to the second the first counter, the third differentiating unit connected in series, the OR element and the second counter, as well as the second coincidence selector, are characterized in that, to increase the reliability of reception, a delay element, three triggers and an inverter are inputted, the output of which is connected to the input of the third differentiating unit, and the input is connected to the output of the receiving unit connected to the first input of the start-stop trigger, the second input of which is connected to the output of the n-th bit of the start-stop distributor, the inputs of the first trigger are connected s with the first and second outputs of the start-stop distributor, and the output is connected to the second input of the first match selector, the second input of the OR element is connected to the output of the first differentiating unit, the output of the delay element is connected to the first input of the second trigger, the second input and output of which are respectively connected to the output of the element OR and the first input of the second match selector, the second input of which is combined with the input of the delay element and connected to the fifth outputs of the start-stop distributor, the output of the delay element soy dinene with the second input of the second counter, the output of which is connected to the third input of the second match selector, connected to the first input of the third trigger, the second input of which is connected to the output of the n-th bit of the starfusk distributor. Circulation 638 Subscription