SU1078605A1 - Device for separating pulses from sequence - Google Patents

Abstract

A DEVICE FOR THE IMPLEMENTATION OF PULSES FROM THE SEQUENCE, containing three flip-flops, two AND elements and an NOT element, whose input is connected to the strobe bus and to the synchronization input of the first trigger, while the information inputs of the first and second triggers are connected to the single-level bus, their installation inputs are connected to the inverse and direct outputs of the third trigger, respectively, and the outputs to the first inputs of the AND elements, the second inputs of which are connected to the input bus pulses, and the outputs are output device shifts, characterized in that, in order to improve the stability of the duration of the selected impulses, the element OR-H and two additional triggers are introduced into it, the synchronization input of the first additional trigger is connected to the input of the element HE, the output of which is connected to the synchronization input of the second additional trigger, the information and installation inputs of which are connected to the analogous inputs of the first additional trigger and to the second inputs or elements And, These inputs are (L connected respectively to the outputs of additional triggers, and HIGH STEPS - to the inputs of the OR-HHO element, the output of which is connected to the synchronous input of the throw trigger, with the inverse output of which is connected to its information input. o vi eo p: o

Description

The invention relates to a pulse technique and can be used in devices for discrete processing of information and in digital measuring instruments. A device for extracting pulses from a sequence is known, which contains a trigger, the direct and inverse outputs of which are connected to the first inputs of the first and second And elements, respectively, in which the second inputs are connected to the input pulse bus, the third input of the second And element, and the first through the element is NOT connected to the gate signal bus, and the outputs of the AND elements are connected to the output buses of the device and to the inputs of the OR element, the output of which is connected to the counting trigger input, the reset input of which is one with the reset input bus. The device extracts and distributes the first input pulses following the front and decay of the strobe signal ij to various channels. A disadvantage of the known device is its narrow frequency range, since the device does not provide for the selection of input pulses if their tracking period is longer than the duration of the strobe signal and the input pulses do not fall within the gate interval. This disadvantage does not allow using the known device in circuits with a wide frequency range of input signals. The closest to the present invention is a device for separating pulses from a sequence containing three flip-flops, two AND elements and an NOT element, whose input is connected to the gate pulse bus and to the synchronization input of the first trigger, and the output to the synchronization input of the second trigger. first and second triggers are connected to a single-level bus, their installation inputs are connected to the inverse and direct outputs of the third trigger, respectively, and the outputs to the first inputs of the AND elements, the second whose inputs are connected to the input pulse bus, and the outputs are connected to the S and R inputs of the third trigger, respectively, and are output buses of device 2. The disadvantage of this device is the dependence of the duration of the output pulses on the gate signal arrival time. The purpose of the invention is to improve the stability of the duration of the extraction of pulses. This goal is achieved by the fact that the device for implanting pulses from a sequence containing three flip-flops, two AND elements and an NOT element, whose input is connected to the gate pulse bus and to the synchronization input of the first flip-flop, when In this case, the information inputs of the first and second triggers are connected to the single-level bus, their installation inputs are connected to the inverse and direct outputs of the third trigger, respectively, and the outputs to the first inputs of the And, W elements These inputs are connected to the input pulse bus and the outputs are the device output buses, an OR-NOT element and two additional triggers are introduced, the synchronization input of the first additional trigger is connected to the input of the NOT element, the output of which is connected to the synchronization input of the second additional trigger, information and the installation inputs of which are connected to the analogous inputs of the first additional trigger and to the second inputs of the AND elements, the third inputs of which are connected respectively to the outputs of the additional ADDITIONAL triggers, and outputs - to the inputs of OR-NO element whose output is connected to the input of the third flip-flop timing inverse output of which is connected to its data input. Figure 1 shows the functional diagram of the device; 2 and 3 are timing diagrams explaining its operation. The device contains three flip-flops 1-3, two elements 4 and 5 and element 6, the input of which is connected to the gate 7 of the strobe pulses and the synchronization input of the first trigger 1, and the output with the synchronization input of the second trigger 2, while the information inputs the first and second triggers 1 and 2 are connected to the single-level bus, their installation inputs are connected to the inverse and direct inputs of the third trigger 3, respectively, and the outputs to the first inputs of the And 4 and 5 elements, the second inputs of which are connected to the bus 8 input pulses, and the outputs are in Output buses 9 and 10 of the device, as well as the element OR-NE 11 and two additional trigger 12 and 13, the synchronization input of the first additional trigger 12. is connected to the input of the element HE 6, the output of which is connected to the synchronization input of the second additional trigger 13, information and

The installation inputs of which are connected with similar outputs of the first additional trigger 12 and with the second inputs of the AND 4 and 5 element whose third inputs are connected respectively to the outputs of Additional triggers 12 and 13, and the outputs to the inputs of the OR-NOT 11 element, the output of which is connected to the synchronization input the third trigger 3, the inverse output of which is connected to its information input. The device uses D-triggers.

The device works as follows.

If the period of input pulses on bus 8 (Fig. 2a) is shorter than the duration of gating pulses on bus 7 (Fig. 26), the zero level from the direct output D of the trigger 3 locks trigger 2 via the R input and the zero level is maintained at its output element AND 5. Trigger 1 is unlocked by a single level from the inverse output) of the trigger 3. Periodically (at the frequency of the input pulses), the zero state of the triggers 12 and 13 is confirmed by I feeding the input pulses to the P, -input. Since the D-input of the trigger 1 is connected to the unit-level bus, the front of the gate pulse from the bus 4 arriving at its C-input causes the output of the trigger 1 of the unit level (FIG. 2d), while the strobe-pulse coincides with the time a single value of the input pulse (moment of time triggered trigger 12 and at its inverse output appears zero (fig.2d), locks; element i, 4. At time t, the trigger 12 returns to zero and the unit level from its inverse output unlocks the element And 4. Per The second input pulse following the moment of time t- passes through the open element AND 4 to the output bus 10 (FIG. 2e) of the device, the same pulse through the element OR-HE 11 enters the C-input of trigger 3 (FIG. 2g) and changes its state (Fig. 2z, i). The zero level from the inverse output D of the trigger 34 (Fig. 2i) that appeared at this moment blocks the trigger 1 from the inlet, the zero level set on its output, the locking element I 4. Simultaneous - trigger 3 removes the lock on the R-input from trigger 2, resulting in a strobe pulse at the output of the element HE 6 (Fig. 2b) causes the appearance of a unit level output of the B-trigger 2 (Fig. 2 l), if the decay of the strobe pulse coincides in time with the unit value of the input pulse (time tj; ) the trigger 13 is triggered and a zero level appears at its inverse output (fig.2k) / locking element AND 5. At the moment of time, the trigger 13 returns to the zero state (fig.2k) and the unit level from its inverted output unlocks element AND 5. The first output impulse following the withdrawal pulse (time instant i4) passes through the open element K 5 to the output bus 9 (Fig. 2m) of the device, this same impulse through the element OR-NOT 11 goes to C- trigger input 3 (fig.2zh), and returns it and all

the device is reset.

° Pr and upon receipt of the next gating pulse, the device operation cycle is repeated. In this way,

0 if the period of the input pulses is shorter than the duration of the strobe signal, the device extracts and sends to the various channels the first input pulses that follow

5 after the front and fall of the strobe signal, without distorting their duration.

If the period of the input pulses on the bus 8 (Fig, Over) is longer than

0 of the strobe signal on bus 7 (fig.Zb), then the trigger 1 is unblocked by the unit level incoming at its R-input from the inverse output of D. -trigger 3, therefore, the front of the gating pulse arriving at its C-input causes a trigger 1 of the unit level (FIG. 3D), while if the front of the strobe pulse coincided in time with the unit value of the input pulse (time ti), the trigger 12 is triggered and at its inverse output appears the zero level AND 4. I

At time i, the flip-flop 13 returns to the zero state (Fig. 3g) and the unit level from the inverse of the output returns element 4. And the device goes into the waiting mode for the input pulse on the bus 8. At the same time, the strobe pulse at the output of the element is NOT b (Fig. 2b) does not cause a change in state B of the trigger 2 because of its blocking at the R input by the zero level from the direct output D of the trigger 3. The incoming input pulse through the open element 4 passes to the output bus 10 of the device

0 (fig.Ze) the same impulse through the element OR-NOT 11 goes to the C-input; trigger 3 (fig.Zh), changes it

state (figs, and). At this moment, the zero level from the inverse input of trigger 3 (FNG. Blocks the R-input trigger 1, set the zero level / locking element I 4 on the R output) at the same time. The trigger 3 unlocks the noR g input to the trigger 2 in As a result, the next gate pulse at the output of the HE 6 element sets a single level (FIG. 3L) on it, the unlocking element AND 5. The next input pulse on the bus 8 through the open element AND 5 passes to the output bus 9 of the device (FIG. 3m) jnJTbJTJTJTJyUTJOnJlJ simultaneously returning D-flip The whole device is in its original state. When the next gating pulse arrives, the device’s operation cycle is repeated. Thus, the proposed device distributes the output buses to the output buses from the input buses, and the duration of the output pulses does not depend on the response time of the device elements, which improves stability of the duration of the emitted pulses.

Claims (1)

A device for extracting pulses from a sequence, containing three triggers, two AND elements, and an NOT element, whose input is connected to the gate pulse bus and to the synchronization input of the first trigger, and the output - to the synchronization input of the second trigger, while the information inputs of the first and second triggers are connected to the bus of a single level, their installation inputs are connected respectively to the inverse and direct outputs of the third trigger, and the outputs to the first inputs of AND elements, the second inputs of which are connected to the input importer bus pulses, and the outputs are the output buses of the device, characterized in that, in order to improve the stability of the duration of the allocated imputes> ow, an OR-Neg element and two additional triggers are introduced into it, and the synchronization input of the first additional trigger is connected to the input of the element NOT, the output of which connected to the WTO synchronization input ·. horn additional trigger, information and installation inputs of which are connected to similar inputs of the first additional trigger and to the second inputs of AND elements, the third inputs of which are connected respectively to the outputs of additional triggers, and the outputs - to the inputs of the element OR-NO, the output of which is connected to the input synchronization of the third trigger, the inverse output of which is connected to its information input. SUη 1078605 ί 1 1078605 2