SU1275655A1 - Device for selecting and subtracting the first pulse in pulse train - Google Patents

Abstract

The invention can be used to build devices for processing pulse signals. The purpose of the invention is to improve the noise immunity of the device. The device contains a counter 2, an element 5, a comparison and a trigger 6. The introduction of a pulse generator 1, a meter of 4 time intervals, by changing the parameters of which the position and value of a selectable time interval can be changed, processed the quasiperiodic series, register 7, the driver of 8 pulses and elements Both 10 and 12 make it possible to remember the value of the period of the following pulse series. 3 il.

Description

The invention relates to a pulse technique and can be used in the construction of pulse signal processing devices.

The purpose of the invention is to increase noise immunity by storing the value of the period following a series of pulses.

Figure 1 presents the electrical functional diagram of the proposed device; figure 2 - meter time intervals; on Fig.3 timing diagrams explaining its principle of operation,

A device for extracting and subtracting the first pulse from the series contains a pulse generator 1, the output of which is connected to the counting input of the counter 2, the R-input of which is connected to the bus 3 of the control signal and the first input of the meter 4 time intervals, and the outputs to the first group of inputs of element 5 comparison, the output of which is connected to the R-input of trigger 6, and ΈτορΒΗ is a group of inputs with the outputs of register 7, the information inputs of which are connected to the main outputs of the meter'4 time intervals, and the C-input - with an additional output of the meter 4 time intervals, the second input of which is connected to the S-input of the trigger 6 and the output of the pulse shaper 8, the input of which is connected to the first output bus 9 and the output of the And 10 element, the first input of which is connected. . is dined with an inverse output of trigger 6, and the second input is with an input bus 11 of a series of pulses and the first input of an And 12 element, the output of which is connected to a second output bus 13, and the second input is with a direct output of trigger 6.

The time interval meter 4 comprises a pulse generator 14, a coincidence element 15, a counter 16, a trigger 17.

The device operates as follows.

In the initial state, the direct output of trigger 6 is a low level of activity. 'Element And 12 is closed, Element And 10 is open.

The first pulse from the series (Fig. 3?) Received at the second input of the And 10 element passes to the shaper'8 pulses (on the trailing edge) and overturns the trigger 6. The pulse duration at the output of the shaper '8 pulses (Fig.Zg) should be longer the duration of an individual pulse in a series to pass it to output 5 of the device without changes.

Thus, after the first pulse from the series has arrived on the output bus 9 of the device (Fig. 3d), trigger 6 is switched.

Element And 12 opens and all steel pulses from the series, except the first, are received on the output bus 13 of the device.

The pulse from the 8 pulse shaper also enters the time interval meter, thereby ending the cycle of measuring the time delay of the packet relative to the signal

2Q control (Fig. Za)

The measurement circuit contains a pulse generator 1, a counter-2, a comparison element, a meter 4 time intervals and a register 7 received on the input bus 3.

The control signal (FIG. 3a) resets counter 2. The counter 2 starts counting the pulses of the reference frequency of the pulse generator 1 (FIG. 3B). Comparison element 5 generates a signal at a time when the value of the current code in counter 2 matches the code of the time interval recorded in register 7. The signal from comparison element 5 sets trigger 6 to state “0”, preparing the device for receiving the next series of pulses. Thus, the choice is made of the time interval where the arrival of a packet of pulses is expected.

, All random interfering signals outside this interval are selected, which ensures the noise immunity of the extraction process.

The time interval meter 4 is used to measure the time interval between the control signal and the 5® first pulse of the burst. The arrival of the next signal on the control bus 3 causes a repetition of the processing cycle. By changing the parameters of the meter 4 time intervals, it is possible 55 to change the position and size of the selected period of time, processing quasiperiodic series.

Claims (2)

flch The invention relates to a pulse technique and can be used in the construction of devices for processing pulse signals. The purpose of the invention is to increase noise immunity by memorizing the value of the period of the pulse train. Fig. 1 is an electrical functional diagram of the device to be predicted; in Fig.2, the time meter of time intervals is shown; in FIG. 3, timing diagrams explaining its principle of operation. A device for isolating and subtracting the first pulse from the series contains a generator of I pulses, the output of which is connected to the counting input of counter 2, the R input of which is connected to bus 3 of the control signal and the first input of meter 4 time intervals, and outputs to the first group of inputs of element 5 comparison, the output of which is connected to the R-input of the trigger 6, and the second group of inputs to the outputs of the register 7, the information inputs of which are connected to the main outputs of the meter 4 time intervals, and the C-input - with an additional meter input 4 time intervals, the second input of which is connected to the S-input of the trigger 6 and the output of the pulse shaper 8, the input of which is connected to the first output bus 9 and the output of the AND 10 element, the first input of which is connected to the inverse output of the trigger 6, and the second one} - with the input bus 11 of the pulse series and the first input of the element AND 2, the output of which is connected to the second output bus 13, and the second input with the direct output of the trigger 6. The meter 4 of the time interval contains the generator 14 of pulses, the element 15 coincidence, counter 16, trigger 17. Device works is sledzposchim manner. In the initial state at the direct trigger of trigger 6, a low level of activity. Element And 12 is closed, element And 10 is open. . The incoming first pulse from the series (Fig. 3) to the second input of the element I 10 passes to the driver of pulses 8 (at the falling front) and triggers trigger 6. It has a duration of 52 pulses at the output of the driver of 8 pulses (fig. 3g) should be longer than a separate pulse in the series to skip it to the device output unchanged. Thus, after the first impulse from the series came to the output bus 9 of the series (Fig. 3a), the trigger 6 is switched. Element I 12 opens and all the remaining impulses from the series except the first pulse go to the output bus 13 of the device. The pulse from the pulse shaping unit 8 also enters the time interval meter 4, thereby ending the packet time delay measurement cycle relative to the control signal (Fig. 3q). The measurement loop contains a generator of I pulses, a counter-2, an element of 5 comparison, a meter of 4 time intervals and a register 7 arriving at the input bus 3. The control signal (Fig. 3a) resets the counter to zero 2. Counter 2 begins to pulse the pulses of the reference frequency of the pulse generator (Fig. 3 &). Comparison element 5 generates a signal at that point in time when the value of the current code in counter 2 coincides with the code of the time interval recorded in register 7. The signal from comparing element 5 sets trigger 6 to the state o by preparing the device to receive the next pulse train. In this way, a selection is made of the period of time where the arrival of a burst of pulses is expected. All random interfering signals outside this gap are selected, which ensures the noise immunity of the isolation process. The time interval meter 4 serves as a dp time domain measurement between the control signal and the first burst pulse pattern. The arrival of the next signal on the control bus 3 causes a repetition of the processing cycle. By changing the parameters of the 4 time interval meter, you can change the position and size of the selectable time interval, the most important processing of quasiperiodic series. 3 The invention The device for isolating and subtracting the first pulse from the series containing two output buses, a trigger, two input buses, the first of which is connected to the first input of the counter, the outputs of which are connected to the first group of inputs of the comparison element, characterized in that noise immunity due to the memorization of the value of the next period of the series, a pulse generator, a register, a time interval meter, a pulse shaper, elements I, the output of the first of which is connected to the first output bus, the first input - with the direct output of the trigger. gera, and the second input is connected to the second 554 bus and the first input of the second element I, the second input of which is connected to the invariant output of the trigger, and the output to the second output bus and the input of the impedance generator, the output of which is connected to the first input of the time interval meter and the first input of the trigger | the second input of which is connected by the output of the comparison element, the second group of inputs of which is connected to the outputs of the register, the information inputs of which are connected to the main outputs of the time interval meter, and the recording input - from an additional output of the time interval meter, the second input of which is connected to the first input of the counter, the second input of which is connected to the output of the pulse generator. 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