SU388262A1 - DEVICE FOR MONITORING THE SOURCE OF PULSE SEQUENCE - Google Patents

Description

one

The device for controlling the source of the pulse train is intended for use in automatic telephone and computer systems.

Sources of pulses are known that have a M: a plurality of outputs, each of which generates a sequence of impulses in such a way that the IMpulse at each subsequent output is shifted in relation to the pulse at the previous output. The source of pulses can produce one or more groups of sequences.

A device for joining a source of a pulse sequence containing two flip-flops is known at the outputs of which a comparison circuit is turned on, and a logic device is switched on between the source of controlled pulse sequences and the DM1IMT of the flip-flops, while the control output of the other flip-flop generator. This device makes it possible to control a plurality of pulse sequences in which the pulses are shifted relative to each other by half a period.

The proposed device differs from the known one in that the odd outputs of the source of the pulse sequence are connected via a single OR circuit to the zero input, and the even outputs through a different circuit by a single trigger input.

Due to this, it is possible to control sources of pulses that have multiple outputs, and an increase in the number of groups of monitored sequences does not require duplication of control devices.

The proposed device allows controllable | Vat sequences both with " overlapping and with an interval between the fronts of pulses at a subsequent output relative to pulses at a previous output, and no restrictions are imposed on the value of the allowable " overlap and interval, which may or may not be ((back front pulse at the previous output may coincide in time with the leading edge of the pulse at the subsequent output.) It provides the ability to control the frequency of occurrence, presence, range and the front of the pulses at Exit controlled source and the possibility of automatic indication of a defective output number. An apparatus suitable for controlling nmpulsov not limited frequency range and their duration.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 is a timegram illustrating the monitoring of pulses following intervals at adjacent outputs; in fig. 3 - Times, per chart, illustrating pulse control, slS

blowing with a “11” on neighboring exits.

The controlled object contains a triggering device 1 and a distributing device 2, which form the source 3 of a sequence of pulses, which has n outputs. The triggering device can be, for example, a multivibrator with any coefficient of duty ratio.

The proposed Coptrol device contains TRI | HGER 4 and 5, two logic circuits 6 "OR, connected to separate inputs of the trigger 5, circuit 7, combining the outputs of the trigger, as well as the actuating element 8, connected at the output of circuit 7 compared to the reverse circuit connection with the input of the triggering device /, the output of which is connected to the common input of the trigger 4.

The triggering device / generates the pulse sequence acting on the distribution device 2 No. simultaneously to the input thrilger 4.

The source 3 of the pulse sequence has n outputs, with the pulse at each subsequent output shifted relative to the pulse at the previous output, as shown in the time diagrams MMAh (Fig. 2 or 3). The trigger 5 has a separate input. The outputs of the source of 3 pulses (1, 2, ... n) are combined into two groups, for example, using two logic circuits 6 "OR in such a way that All even outputs are routed to one trigger input 5, and all odd ones to another input same trigger.

Triggers 4 and 5 are set to one of the stable states, and their outputs, which in the initial state, have the same polarity, for example, such as shown in FIG. 1 are connected to a comparison circuit 7. Scheme 7 compares. two sequences of signals arriving from the outputs of the triggers by their polarity, amplitude and duration.

When a pulse is received from the output 1 of the source, the first input of the trigger 5 changes the state of this trigger. At the same time, a pulse from the triggering device 1 passes to the counting input of the trigger 4 and switches it to the second steady state.

Now, just as in the initial polarization, from the output of the flip-flops 4 and 5, pulses of the same (positive) polarity of a certain duration and amplitude are output. A pulse from the next (second) output of source 3, arriving at the right input of trigger 5, returns this trigger to its original state.

The pulse from the output of the triggering device 1 transfers the trigger 4 to the initial position, so that pulses of the same polarity, duration and amplitude are again fed to the input of the circuit. With good source outputs, this process repeats: each pulse from the odd-out switches the trigger 5 to the state "1, and each pulse from the even output returns it to the state" O. Thus, under the action of monitored pulses alternately affecting the inputs of trigger 5, it changes its state with the frequency of monitored pulses that in turn turn trigger 4. The resulting pulse sequences with identical frequency of repetition, duration, polarity and the amplitude of each pulse in the sequence :, affects the inputs of the coping circuit 7.

In the case under consideration, the signal at the output of the comparison circuit is absent and the actuating element 8 of it operates. If one of the OUTPUTS fails, for example, and as a result, there is no pulse at the third output (see Fig. 2, where the missing pulse is marked on the timing diagram) trigger 5 does not switch, it remains in the previous state, but trigger 4 switches as a result, different polarities are supplied to the comparison inputs 7, for example, a positive potential from the output of trigger 4 and a negative from the output of trigger 5. This triggers the comparison circuit (in Fig. 2, the pulse is shown in dotted lines) and the performer triggers OLT element which outputs a signal "stop on the boot device. The source stops working and the faulty output is blocked at which the lamp is ignited.

For overlapping pulses, the process is similar (Fig. 3).

The control device reacts not only to the complete disappearance of the pulse at the output, but also to a decrease in its amplitude to a critical level determined by the trigger threshold of trigger 5.

If the amplitude at one of the outputs is less than the trigger threshold of trigger 5, it is not transferred (shown in Fig. 3 by a dotted line), and a pulse appears at the output of the comparison circuit causing the actuator to operate. Similarly, for the case of a distorted pulse at the output of the source (there is no switching of the trigger 5, a different polarity signal is fed to the comparison circuit and the actuator is triggered).

Subject invention

A device for controlling the source of a pulse train, containing two flip-flops, the outputs of which are connected to the inputs of the comparison circuit, the output of which is connected to the source of the sequence through the Executive element, pulses, the counting input of one trigger connected to the sequence source of the pulses, and that the odd outputs of the source of a sequence of pulses through one circuit "OR are connected to, zero input, and even outputs through another circuit" OR to the single input of another trigger pa.

1-11--

 a ™ p „™ a ™ p: -,

-4h | -, j. ,

I-- 1-I-- -TC - p f-op

i1

--IJ I

Y- -dUlJlJlJlJlJ

Cm8u1

Mpvz gera output

CXBKib 7 output

Ziztlnof)

one

one

.. J,

I1

I1

/1,3.5 Z2,4S

Khod arnpv.zepa5.

A: r: irrr3Ci :: :: Ф i

Pflf PPTLJl

vyvat scheme 7

J-1

lore

I1