SU783970A1 - Two-channel device for separating pulses coinciding in time - Google Patents

Description

(54) TWO-CHANNEL DEVICE OF SEPARATION OF CO-HANDLING PULSES

one

The invention relates to the field of pulse technology, in particular to devices for synchronizing asynchronous pulses to the input of a counting device and can be used in computing and automation.

It is known ycfportcTBO for synchronizing pulses, containing an input signal bus, two buses of clock pulses, two clock triggers, an RS flip-flop, and AND, AND-NO 1 elements.

However, it may generate output-time-non-standardized pulses if the input signal is the same as the distributor pulse used to gate the output stage of the device.

A two-channel device for separating coincident pulses is known, comprising a pulse sensor, a counting device, a distributor, and two pulse shaping channels, each of which contains three RS flip-flops, four coincidence circuits, and two inverters 2.

Its disadvantage is low noise immunity, in case of an incomplete coincidence of the impulse.

For example, at the moment of interference from the sensor circuits, before the appearance of the output of the pulse distributor, the first coincidence element opens. switches the first trig,

to the ger, after the occurrence of the dispenser pulse, the second coincidence element opens and switches the second trigger, however, at the cutoff of the interfering pulse, both triggers are set

15 to the initial state, as a result of what the output is not normalized by the duration of the imp; 1c.

The purpose of the invention is to improve the mechanical stability of the device in terms of the effects of induced interference on the sensor circuits. : To achieve this goal in a two-channel time-sharing pulse separation device comprising a pulse generator, a distributor, two pulse shaping channels and a counting device, each pulse shaping channel contains two clocks

30 trigger, RS-trigger, two-way

the NAND logic element and the NAND three-input logic element, while the impulse- sensor is connected to the R-input of the first clocked trigger. ow, the direct output of the first clocked trigger is connected to the first input of the three-input NAND logic element and the R input of the RS flip-flop; the inverse output of the first clocked trigger is connected to its information inputs; the inverted output of the RS flip-flop is connected by the e Bi bpeiM input of the three-input logic input of AND-NO, the output of the three inputs of the OSH of the L01GIC element and the IS is NOT connected to the R-input of the second cycle p $ МMbGO Trigger, the inverse output of which is connected to its information input and the first input

lEfSV CB of the Input Logic Element NAND, whose input is connected to the S-input of the RS-trigger and connected to the input of the counting device, and the first output of the distributor is connected to the Uybyu account of the first clocked p «fGera and to the third input of the three-input logic element I- NOT the first channel of the formation of a pulse bv and to the counting input of the second timed trigger and the second input of the DI and the second channel of the formation of pulses, the second output of the distributor is connected to: the counting input of the second trigger and the second the input of the doubled-loop logic element AND-NOT of the first channel of pulse shaping and to the counting input of the ftigipsbro clocked trigger and to f E5efEeSiy input of the three-input logical element IS-NOT of the second channel of pulse generation.

FIG. Figure 1 shows the structural scheme of a two-channel device. The device is divided into 1 coincidently with the time of the pulses; in fig. 2, a – z - timing diagrams of the operation of a single channel formative E1 Ninpulse 6c.

The device contains the distributor 1, the sensors 2, 3 pulses, the channels 4, 5 of the formation of pulses, the pA device 6. Each channel

7 $ 5yr (yrbva№y gYMyulbsov contains the first clocked trigger 7 (7), RS-trigger 8 (8f), the second clocked trigger 9 Of), three-input logic element And-NK 10 (10 /), two-input logic element And - NOT 11 (11),). ;:, -: -; / :,,: ,,.

Consider the operation of the device on odnrgo anal napr5imer

kg "ala 4 / use time interval (Fig. 2). At the outputs, pacTiipe is a Divisor of the Sh4fUyts and Shuysa7 units for half the time they follow (Fig. 2, a, b). Their period; the probe is chosen two or more times shorter than the duration of the pulses coming from sensors 2 and 3.

In the initial state, the sensor 2 has a logic level O output (Fig. 2, c), and the inverse outputs trigger 7, 8 - a logic level; (Fig. 2, d, e) the trigger 9 has a logic O level at the inverse output (Fig. 2, e). The pulses from the distributor outputs to the inputs of the AND-NE 10, 11 gates and to the counting inputs of the flip-flops 7, 9 do not change their states, therefore, not. pass to the input of the counting device b.

After the pulse from sensor 2 (Fig. 2, c) appears across the pulse of distributor 1 (time interval t; (- t2 Fig. 2, a)), trigger 7 is switched and generates a logical O level at the inverse output (Fig. 2, d) Thus, the incoming pulses from the output of the distributor to the end of the sensor pulse do not change the state of trigger 7. A subsequent pulse from the output of distributor 1 (Fig. 2, a), which arrives at the third input of the AND-HE logic element io, passes to R-input of the second clocked trigger 9 in the form of a negative pulse (Fig. 2, g); ep 9 and setting it on the inverted output informa tion input and the first input of the two-input NAND gate 11 and NOR logic level 1 (Fig. 2f).

The pulse passing from the second output of the distributor 1 (Fig. 2 / S) generates at the output of the logic element 11 an output signal (Fig. 2, c), which is fed to the input of the counting device 6. The duration of the Signal or the output of the element AND NOT 11 is equal to length, of the distributor 1, At the same time, the pulse from the output of the NE-11 element switches the RS-flip-flop 8 to the S-input, after which the output Signal from its inverse output (Fig. 2, e) prohibits the passage of the pulses from the distributor 1 (FIG. 2, a) at the output of the element AND-HE 1O dB of the end of the pulse of the sensor (Fig. 2, c).

Over the cutoff pulse of the dispenser .1 (Fig. 2.6), the trigger 9 is reset (Fig. 2, & Triggers 7, 8 are set to, the initial state at the end of the pulse from the sensor 2 (Fig. 2, d). Thus, for each output impulse from sensor 2, ONE is normalized with respect to one of the pulses from the output b of the distributor (Kfig. 2.6).

The proposed device allows It does not exclude the formation of impulses of cov. at the inputs of the counting device

6 when exposed to noMisjs pulses on the circuits of sensors 2 and 3, if their duration is less than one period of follower pulses of the distributor 1. The effect of interference leads to the appearance of short signals between the pulses of the sensor or the fragmentation of the sensor pulses (Fig. 2, time interval). In this case, switching of the trigger 7 is possible only if the interference pulse (Fig. 2, c) coincides with the distributor pulse (Fig. 2, a), but the state of the trigger 9 cannot change and, therefore, the output pulse is generated, since at the moment of arrival , the next pulse from the distributor 1 (Fig. 2, a) the interference pulse is absent, which leads to the switching of the trigger 7 to the initial state.

Cial 5 pulse shaping works in the same way as channel 4.

If there is a pulse from sensor 3 at the second input of the counting device b, a normalized pulse appears, synchronously with one of the output pulses of the distributor 1. Since the pulses at the outputs of the distributor 1 do not coincide in time, the pulses at the inputs of the counting device 6 are separated in time, even if the pulses from sensors 2 and 3 completely coincide.

Claims (2)

Invention Formula A two-channel device for separating coincident pulses, comprising a pulse sensor, a distributor; Two channels of pulse shaping and a counting device, characterized in that, in order to increase the noise immunity of the device under the conditions of the effect of induced noise on dbp m sensors, each channel of the formation of pulses contains two clocked triggers, RS-trigger, two-input logic, AND-NES element and three-input N-NE logic element, while the pulse sensor is connected to the I-input of the first clocked trigger, my output is the first clocked. Hera is connected to the first input of a three-input logic element. NAND and R-input of the RS-flip-flop, inverse output of the first clocked - flip-flop is connected to its information inputs, inverse output of the RS-flip-flop is connected to the second input of the 3-input logical circuit AND NAND, the output of the 3-input logic element N-NO is connected to R -BXO5 house of the second clocked trigger,. the inverse output of which is connected to its information inputs and to the first input of a two-input logic element NAND, output 0 of which is connected to the 5th input of the RS flip-flop and connected to the input of the counting device, and the first output of the distributor is connected to the counting input of the first clocked e flip-flop and to the third input of the three-input logic element AND-NOT of the first channel of formation of pulses, and to the counting input of the second clocked trigger and the second input of the two-input logic element 0 AND-NOT of the second channel of formation. pulses, the second output of the distributor is connected to the - counting input of the second clocked trigger and the second input of the two-input logic element AND-NOT of the first channel of pulse generation and to the counting input of the first clocked trigger and to the third input of the three-input logic element of Ig-NE.Two second pulse shaping channel. Sources of information taken into account in the examination 1, USSR Copyright Certificate No. 607343, cl. H 03 K 19/42, 08/30/74 2. Authors certificate USSR 424320 ,, class. H 03 K 23/00, 20.03.72 (prototype).