SU919072A1 - Device for discriminating train - Google Patents

Description

I

The invention relates to a pulse technique and can be used in discrete information processing devices and digital measuring devices.

A device for extracting pulses from a sequence is known, comprising two D-triggers and two HE elements. On the front and in the decay of the strobe signal and the output bus of this device, pulses are formed that are synchronous with the input signals and are equal to them for a long time. type of .

A disadvantage of the known device is a narrow frequency range, since it does not ensure the selection of input pulses if the period of their following. More than the duration of the gate pulse and the BXOAHbie pulses do not fall within the gate interval.

Closest to the present invention is a device for separating

pulses from a sequence containing a trigger, direct and inverse, whose outputs are connected to the first inputs of the first and second AND elements, respectively, whose second inputs are connected to the input pulse bus, the third input of the second And element, and the first through the element NOT The coefficients are connected to the gate signal bus, and the outputs of the And elements are connected to the output buses of the device and the inputs of the OR element, the output of which is connected to the counting input of a trigger, the reset input of which is connected to the input reset bus 2.

15

The device extracts and distributes the first input pulses following the front and fall of the strobe signal to various channels.

The drawback of the device is its 57

20 a narrow frequency range so the device does not provide the selection of input pulses if the period of their following is longer than the duration of the strobe pulse and the input pulses do not fall within the strobe interval. This disadvantage does not allow using the known device in circuits with a frequency range of input signals, for example, in electron-beam oscilloscopes. The purpose of the invention is to expand the frequency range of a device for extracting pulses from a sequence. The goal is achieved by the fact that, in a known device for extracting pulses from a sequence containing an R-trigger, the first and second elements are AND-NOT, whose outputs are output code buses of the device, and their first inputs are connected to the input pulse bus, and the element is NOT whose input is connected to the bus with generalized pulses, the first and second D triggers are entered, and the inputs of which are connected to the bus of a single level, and their outputs are connected to the second inputs of the first and second elements AND-NOT, the outputs of which are connected to 5 and S inputs and Rs Tptir hera, respectively, the direct output of the trigger fts is connected to the R input of the first D-flip-flop, the G-input of which is connected to the output of the HE element, and the inverse output of the RS-trigger is connected to the R-input of the second D-trigger, C-in connected to the bus strobe pulses. FIG. 1 shows the scheme of the proposed device; in fig. 2 and 3 are time diagrams at characteristic points of the circuit for the follow-up period of the input pulses that are shorter and longer than the gate length, respectively. The device for separating pulses from the sequence contains two D flip-flops 1 and 2, the D inputs are connected to the busbar (logical) level bus, the C input of the figger 1 is via inverter 3, and the trigger 2 is directly connected to the bus 4 Sl1 pulses of the pulses, the outputs of flip-flops 1 and 2 are connected respectively with the first inputs of the elements 5 and 6 AND-NOT, the second inputs of which are connected to the bus 7 input pulses. The outputs of elements 5 and 6 are connected respectively to the output ports 8 and 9 of the device and to the R and o inputs of the RS trigger U, in which the direct output is connected to the U input D –iptrrrepa 1, and the shaft output to the I input D of the fitger 2

pulse from bus 4 will cause the output of trigger 2 of a single level (FI 28), which unlocks the AND-NOT element 6. The first input pulse, following the 20 front of the strobe pulse, passes through the open element 6 to the output bus 9 (Fig. 2d) of the device and simultaneously enters the 5th input of the trigger U, changes its state. The device operates as follows. If the period of input pulses on bus 7 (Fig. 2a.) Is shorter than the duration of the strobe output signal on bus 4 (Fig. 26), the zero level from the direct output 5JS of the trigger U at the R input of the trigger 1 and its output is maintained at zero level locking element 5 AND-NOT. Trigger 2 is unlocked by a single level from the inverse output of the H5 trigger 10. Since the D input of the trigger 2 is connected to the single-level bus, the front gate of the trigger 10 at this moment arrives at its C-input and blocks the I-trigger trigger 2, setting at its output a zero level, the locking element 6. At the same time, the R5-trigger 10 releases the lock on the I-input of the trigger 1, as a result of which the inverted inverter of the strobe pulse causes the output of the trigger 1 of the unit level ( n. 2E), unlocking element 5. The first output pulse, the pulse following the fall of the gating HMnyfcbca, passes through the open element 5 to the output bus 8 of the device (Fig. 2e) and simultaneously arriving at the C input of the trigger 10, returns it and the entire device to its original state. When the next gating pulse arrives, the cycle of operation of the device is repeated. Thus, if the period of the input pulses is shorter than the duration of the strobe signal, the device extracts and sends to the different channels the first input pulses, which follow (Jpoi and the decay of the strobe signal. If the period of the input pulses on bus 7 (Fig. Over) the duration of the strobe pulse on bus 4 (Fig. 35), then the trigger 2 is unblocked by the unit level arriving at its R-input from the inverse output of the H5-trigger 1O, therefore it is sent to its C-input 4rone of the strobe pulse

causes the appearance at the output of the trigger, 2 unit levels (fig. 36), unlocking element 6. The device enters the standby mode of the input impedance on the bus 7. In this case, when inverter 3 inverts, the drop of the strobe pulse does not cause a change in the state of the D-trigger 1 due to its blocking on I-input zero level from the direct output of the RS flip-flop Y. The received input pulse through the open element 6 passes to the output bus 9 of the device (FIG, 3T) and simultaneously changes the state of the RB trigger 11, blocking the level with his inverse In the code D-trigger 2 and locking element 6. At the same time, the RS-trigger 1O removes the lock on the R-input of the trigger 1, as a result of which, inverting by the inverter 3, the next gate pulse forms a unit level (Fig. 3d) that unlocks the element 5. The next input pulse on bus 7 through the open element 5 passes to the output bus 8 of the device (Fig. Ze), at the same time returning the RS-trigger 10 and the entire device to the initial state. When the next gating pulse arrives, the device's operation cycle repeats,

Thus, the proposed device provides distribution of output pulses from the input, tires, the period of which can vary over a wide range compared with the duration of the gating pulses, which expands the area of use of the device.

Claims (2)

Invention Formula A device for separating pulses from a sequence, containing an H5 trigger, an element NOT, the input of which is connected to the bus of strobe pulses, and two elements NAND, whose outputs are the output buses of the device, and the first inputs are connected to the bus of input pulses, characterized in that In order to expand the frequency range, the first and second O triggers are entered into it, the D inputs of which are connected to the unit-level bus, and their outputs are connected to the second inputs of the first and second elements AND –NE, the outputs of which are connected to R and S - log in am RS-trigger, the direct output of which is connected to the AND input of the first D-trigger, the C input of which is connected to the code of the NOT element, and the inverse output RS of the trigger is connected to the R input of the second I) trigger, the input of which is connected with bus gating pulses. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 72О7О9, cl. And 03 K 5/04, 1980. 2. USSR author's certificate number 632075, cl. H 03 K 5 / 2O, 1978 (prototype). g