SU1515143A1 - Selector of standard time signals - Google Patents

Abstract

The invention relates to electronic engineering and can be used to periodically assign the time scales of various timekeeping instruments to the time and frequency state ethanol scale. The aim of the invention is to improve the noise immunity of the selector. The second and minute time test signals come from the input bus 25 to detector 1, where the corresponding sequence of video pulses is generated. The first second video pulse includes its leading edge, passing through trigger 4, element AND 9, element OR 23, element AND 10 and element OR 11, the main generator 5 for examining the duration and temporal position of the input signals. The study of the second signals is performed on the EXCLUSIVE OR 2 element and the delay element 12, and a similar study of the minute signals on the EXCLUSIVE OR 3 element and the delay element 18. In this case, the violation of the duration of the temporary position of the signals is performed respectively on triggers 4 and 19. Under normal input signals, second pulses of the generator 5 are counted using counters 6, 7 and trigger 22, and the time correction signal on the output bus 26 is generated 60 seconds after the start examining the first minute input. If the input signals are incorrectly positioned or their duration is violated (with interference), the main generator 5 is turned off, and an additional generator 13 starts operating instead. Both generators 5 and 13 start from the same clock bus 24, and their second pulses coincide with each other. The second signal, which immediately follows the interference, is investigated on the EXCLUSIVE OR 14 element and the delay element 15, and is fixed via AND 16 on triggers 17 and 21. The same minute fixation is performed on AND 20 on trigger 8 2 il.

Description

after the start of the study, the first minute input signal. If the input signals are incorrectly positioned or their duration is violated (for example, xx), the main generator 5 is turned off, and an additional generator 13 starts operating instead. Both generators 5 and 13 are started from one clock circuit 24, and their second pulses coincide with each other.

a friend. An investigation of the second signal immediately following the disturbance is carried out on

element EXCLUSIVE OR 14 and element 15 delay, and its fixation is carried out. through the element AND 16 on the trigger 17 and 21. A similar fixation of the minute signal is carried out through the element AND 20 on the trigger 8. 2 Il.

The invention relates to electronic technology and can be used to periodically assign the time scales of various timekeeping instruments to the national standard of time and frequency.

The aim of the invention is to improve the noise immunity of the selector.

Figure 1 shows the structural diagram of the selector; figure 2 - timing charts of his work.

The selector contains a detector 1, connected by its output to the first inputs of the first and second elements EXCLUSIVE ISH 2,3 and to the first input of the first trigger 4, the first generator 5, connected by its first output to the counting input of the first counter 6, the second counter, connected by its the output to the first input of the second trigger 8, the first and second elements And 9, 10, the first element OR 11, the first delay element 12, the ring circuit from the second generator 13, the third element EXCLUSIVE OR 14, the second element

15 delay, second element OR

16 and the third trigger 17, a serial circuit of the third delay element 18, the fourth trigger 19

and the third element And 20, fifth and sixth triggers 21, 22, tert1 th element KII 23, clock bus 24 and vhonuyu and output bushes 25, 26. The output of delay element 12 is connected to the second input of trigger 4, and the second output of generator 5 is connected to the second input of the element EXCLUSIVE 1 ALTERNING OR 3. Clock bus 24 is connected to the clock inputs of the generators 5 and 13, and the first output of the generator 5 is connected to the second inputs of the element EXCLUSIVE SHSh 2, trigger 10 and

0

five

0 0

0

five

element OR 16. The first input of the trigger 21 is connected to the first output of the generator 13, the second output of which is connected to the second input of the trigger 21 connected to its output through the element OR 23, the element 10 and the element OR II to the inputs of the zero setting of both counters 6, 7 and generator 5, the third output of which is connected to the second input of element 20 I. The fourth output of the generator 5 is connected through element 9 AND to the second input of the element OR 23, and the first output of counter 6 is connected to the counting input of counter 7, the output of which is connected via a trigger

22 to the second input element l-OTi 10. The output of detector 1 is connected to the second inputs of the element EXCLUSIVE OR 14 or trigger 17, and the output of the generator 4 is connected to the second input of element 9 I. The outputs of the elements SCI OR3, 2, 2 are connected respectively to the inputs of the elements

18, 12 delay, and the second output of the counter 6 is connected to the second input of the trigger 22 and the third input element And 20 connected by its output to the second input of the element 11 and the second input of the trigger 8, the output of which is connected to the enabling input of the counter 7,

The selector works as follows.

In the absence of signals on the bus

23 and at the input of detector 1, trigger 4 is in a state where

from its output to the second input of the element And 9 receives a high level of potential, and to the first input of the element And 9 from the generator 5 also receives a high level, which through the element OR 23 passes to the second input

five

: ijit Me HTa II 10, on the first of which there is a high ypont-ni potential, coming from the trigger 22. Element AND 10 is high, potential OR1I is input to the input of the zero generator 5 and counters 6, 7,

When a time test signal arrives on bus 25, a sequence of video pulses is generated at the output of detector 1 (Fig. 2a). Shifting the front of the first video pulse, the trigger 11 is transferred to the state when the low potential level arrives from the output to the second input of the AND 9 element and the high level is removed from the output of the AND 9 element. A low level is detected at the output of the OR 23 element, because at its second input there is a low potential from trigger 21, which is set to a high level from generator 13 at the moment of arrival of the pulse from detector 1 to the input of the zero setting of trigger 17, which, in turn, removes the inhibit signal from the zero installation input of the generator 13 Since a high level was removed at the second input of the AND 10 element, a high potential level is removed from the output of the AND 10 element through the OR 11 element to the inputs for setting the zero of generator 5 and counters 6, 7, and at the output A of generator 5 pulse sequences of shorter duration begin to form (Fig. 26), and at output B, a longer duration, but with the same follow-up period. These pulses arrive at the inputs of the EXCLUSIVE OR elements 2, 3; The other inputs of these elements receive pulses from the output of detector 1: smaller ones - with the same follow-up period, larger with a period of 1 min. At output C of generator 5, pulses are formed that are similar to pulses of short duration, but preceding them (Figure 2B). At the output of the generator, pulses are formed, the leading front of which is ahead and the rear edge is lagging behind the corresponding edges of pulses of short duration (Figure 2d).

At the output A of the generator 13, pulses are generated that imitate a time scale similar to the output A of the generator 5; At the output B of the generator 13 also scale pulses are formed.

D 36

npcMfHH, but shifted in phase f similarly to figv.

If the first output of the IC element is K1GODAUTSEEE 2 or the pulse coming from the output A of generator 5 does not coincide with the pulse at the second input of element 2 coming from the output of detector 1, then at the output of element 2 a high level appears and delay element 12 it sets the trigger 4 to the state when at its output a high level potential arrives at the inputs for setting the generator zero 5 and counters 5 and 12, setting them to their initial state

If the first input of a element is a EXCLUSIVE OR 2 pulse from the output A of the generator 5 coincides with the pulse arriving at the second input of this element from the output of the detector I, then the output of the element EXCLUSIVE OR 2 does not have a signal and the pulse from the output A of the generator 5 is recorded in the pulse counter 6. At the same time, at the input of the pulse at the input of the zero setting of the generator 13 there is a high potential level from trigger 17, which was set to this state by a pulse arriving at trigger 17 through the OR 16 element.

At the moment of termination of the pulse at the output A of the generator 5, the trigger 17 removes a high level, prohibiting the operation of the pulse generator 13, and the output D of the generator pulse 5 to the element 9, through which zeroing occurs, of the generator 5 during pauses, a low potential level prohibits the passage of null pulses until the next pulse appears at the outputs A and D of the generator 5. The generator 5 is reset to its initial state only at the time of the pulses mismatch at the output of the detector 1 and at the output A of the generator 5 or and in the case when, in the pause, the pulse has a shorter duration. In this case, the previous pulse generated at the output of detector 1 is considered false and the pulse generator 5 is associated with a newly received pulse of short duration. At the output A of the pulse generator 5, pulse sequences of a shorter HOC (FIG. 2G)) begin to form again. At the output I - and IT, Shulgogradovatelios-GC 6 (): i: -iiiei length-) iocTH,} ia output G. - ig- 1 Pulse length rt of duration, but stagnation phase (FIG. 2n), and at output D, pulsed sequences follow (malignancies similar to impulses of small 1C1 body1) SPOT, but overlap impulse itself (Fig. 2d).

If at the output of the EXCLUSIVE OR 2 element, the pulse from the output L of the pulse generator 5 coincides with the pulse of shorter duration from the output D (: vector 1 arriving at the second input of this element 2, then the zero output signal at its output is absent and the pulse from output A generator 5 is recorded in counter 6. If several, for example, six signals are successively matched, counter 6 is filled (FIG. 2e) and a signal is generated at its output allowing the search for and investigation of a long-duration pulse, determines the beginning of the next minute, the same signal, formed at the output of counter 6, sets trigger 22 to the state in which the high potential level sent to element 10 is removed from its output, through which the generator 5 was reset and 6, 7.

Detection and study of pulses of a large duration at the output of the detector 1 prO1 Pp-iiiementi And 20, the third input of which receives a signal from counter 6 comes off. The first input of element 20 receives a signal from trigger 19, Fro state is determined by a pulse of small for - from the j-generator 5 to the second input of the trigger 19. then the state of the trigger will remain for a time until the input of the element 3 EXCEPT the STB pulse, with a longer duration} {spine coming from the output B of the generator 5, will in all respects coincide with the momentum yuschim from the detector 1. This means that a longer pulse was detected at the output of detector 1. In this case, before starting the trace of the lean second, a small pulse is sent to the second element H 20 from the output C of the pulse generator 5 (FIG. 2c) and a signal is generated at the B1 1 input of the element 20 and the signal r;

the skull element OR 17 to the inputs for setting the zero of the counters 6, 7, as well as the generator 5. At the same time, this signal sets the trigger 8 to a state in which the counting signal is sent to its counter 7.

Counters 6 and 7 are now connected

consistently, their total capacitance is selected from the condition of filling them over a time interval equal to the difference between the period of the following pulses of longer duration in the time check signal and the time interval between the long pulse and the first pulse of a shorter duration. The signal at the output of count 7 (Fig. 2g), i.e. correction signal

Q on the output bus 26 is Wits at the point in time corresponding to the characteristic point of the time check signals. In this case, he is on Wits at the time of passage of the front

5 minute pulse fronts.

The generator 13 is designed to form a sequence of pulses, analogous to the pulses at the outputs A and C of the generator 5. The generator

“13 should be ready to work only during a pause, i.e. between pulses, in case the main channel of the generator 5 began the study of a false pulse, and for the time of the first false pulse the generator 3 was blocked by a trigger 17.

If the input pulse ends worse than the pulse generated by generator 5, trigger 17 remains in state 1. Generator 5 is also reset.

For example, if after the end of the input pulse, which coincided in duration with the pulse generated by generator 5, a new pulse is input at the input, then the trigger 17 goes to the state O, removing the lock from the generator 13. At the same time, the generator 13, freeing 1c from the lock, begins to generate pulse sequences similar to the pulse sequences of generator 5; the input signals are analyzed in an additional second channel.

If at the output of the generator 5 the pulse has stopped, and at the input of the selector eote is present, then the generator 5 is set to its original state 0

five

0

91

Pie and c. the second input of the tripra 17 gppsh gh: high potential, n the potential of the DiiicoKoro level from detector 1, i.e. from the input of the selector, by setting / k1 trigger 17 to the state where the high level potential is removed from the generator 13 and the analysis of the input-} of the first signal starts in the second channel.

If the pulse 17 ends at both inputs of the trigger 17: simultaneously, then either a low or a high potential level can be output. The first case should be considered as a variant with alternating signals at the input, and the second case is the initial state.

Thus, the selection of the correction signal corresponding to a characteristic point in time is made 60 seconds after analyzing the parameters of a minute 1-pulse and its location is relative to the second (shorter duration of pulses fed to the selector bus 25.

Claims (1)

Invention Formula A time check signal selector containing a detector connected by its output to the first inputs of the first and second elements EXCEPT E OR OR to the first input of the first trigger, the first generator connected by its first output to the counting input of the first counter, the second counter connected by its output to the first input The second trigger, the first and the first two elements AND, the first OR element and the first 11 delay element, the output of which is connected to the second input of the first trigger, and the second output of the First Generator is connected to the second input of the first element is the EXTINGULING OR OR, differing in that, in order to increase the noise immunity of the selector, a ring chain from the second 43 ten " 0 5 0 five 0 five 0 the generator, the third elsgm - gl (Ti (EE riJDJ, the second element i, the second element OR, the third trigger, a series circuit and the third delay element, the fourth trigger and the third O element AND, as well as the fifth and sixth triggers, the OR element and the clock) hl, connected to the clock of the first and second generator, the first output of the first reiU inTi f pn connected to the second inputs of the second element EXCLUSIVE OR, the fourth trigger and the second element of the IPI trigger, and the first input of the fifth trigger coi - Dinen with the first release of the second-about generator, the second output of which is connected to the second input of the fifth trigger connected by its output through the third element 1SH, the second element AND the first element OR to the inputs of setting the zero of both counters and the first generator, the output of which is connected to the second input of the third element AND, the fourth output the first generator is connected via the first element to the second input of the third element of the RSHI, and the first output of the first counter is connected to the counting input of the second counter, the output of which is connected through the sixth trigger to the second input of the second element OR, the detector output is connected to the second inputs of the third EXCLUSIVE OR element and the third trigger, and the output of the first trigger is connected to the second input of the first element AND, the outputs of the first and second elements EXCLUSIVE OR are connected respectively to the inputs of the third and first delay elements, and the second output The first counter is connected to the second, the input of the Sixth trigger and the third input of the third element AND, connected by its output to the second input of the First element OR and the second input of the second trigger, the output of which oedinen with razretayusch11M input of the second counter. fig 2