RU1803969C - Device for selecting pulses from pulse train - Google Patents

Abstract

The invention can be used in information processing devices of control systems for extracting bursts from a pulse sequence with an adjustable number of pulses in a packet and an adjustable length of the gap between the packets. The device comprises a frequency divider 1 with a variable division coefficient, a coincidence element 2, a trigger 3, a control bus 4, a clock bus 5, an output bus 6, a pulse shaper 7, a frequency divider 8 with a variable division coefficient; the pulse shaper contains a delay element 9, an element NOT 10, an element AND 11, an element OR 12. 2 ill.

Description

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The invention relates to a pulse technique and can be used in information processing devices of control systems.

The aim of the invention is to expand the functionality of the device by isolating from the sequence of bursts of pulses with an adjustable number of pulses in a packet and an adjustable length of the gap between the packets.

Figure 1 presents a structural diagram of the proposed device; in FIG. 2 is a timing diagram of a device.

A device for extracting pulses from a sequence comprises a frequency divider 1 with a variable division coefficient, a coincidence element 2, a trigger 3, a control bus 4, a clock bus 5, an output bus 6, a pulse shaper 7, a frequency divider 8 with a variable division coefficient, a line delays 9, element NOT 10. element AND 11, element OR 12.

In this case, the clock bus is connected to the counting input of the frequency divider 1 and to the first input of the coincidence element 2, the second input of which is connected to the output of trigger 3, the S-input of which is connected to the output of the frequency divider 1, the installation input of which is connected to R - the input of trigger 3 and to the output of the pulse generator 7, the first input of which is connected to the control bus 4, and the second input to the inverse output of trigger 3, the D-input of which is connected to the common bus and to the installation input of the frequency divider 8, the output of which is connected to Trigger input 3, and the second input of the frequency divider 8 is connected to the output of the coincidence element 2, which is connected to the output bus 6.

Counters can be used as a frequency divider with a variable division coefficient, for example, 564 NOT 14. A variable division coefficient is specified with a code on the parallel inputs of the counter. As the element of coincidence is used element I.

The device operates as follows.

In the initial state, on the control bus 4 (Fig. 2a), a high voltage level (logic 1) prohibiting the operation of the device. At the output of the frequency divider 1 and directly the trigger 3 is logic 0. When a low level control is received on the bus 4 (Fig. 2a), the frequency divider 1 starts counting pulses arriving at its first input from the bus 5 clock pulses

(Fig. 2b) to a predetermined value (depending on a predetermined division factor of divider 1). Upon reaching this set value, a positive pulse appears at the output of the frequency divider 1, transferring the trigger 3 to the single state (Fig. 2c), allowing the passage of clock pulses through the matching element 2 to the output bus 6 of the device (Fig. 2d). Pulses from the output bus also go to the input of the frequency divider 8, which is triggered by a given pulse edge.

Frequency divider 8 determines the required number of pulses to be emitted (depending on a pre-set division factor). Upon reaching this value, a pulse appears at the output of the frequency divider 8 (Fig. 2d), transferring the trigger 3 to a zero value (Fig. 2c), which prohibits the passage of pulses from the input bus through the matching element 2 to the output bus 6 of the device, and trigger output 3 logical level 1 sets the divider 8 to its original state. At the same time, at the inverse output of trigger 3 (Fig. 2c), a difference is formed from a logical zero to a logical 1, which is fed to the second input of the pulse former 7. According to the positive difference at the input, the output of the former 7 has a positive-polarity pulse, which arrives at the installation input of the frequency divider 1, setting it to its initial state, and the operation of the device resumes.

Claims (1)

SUMMARY OF THE INVENTION A device for extracting pulses from a sequence comprising a frequency divider, a trigger and a coincidence element, the first input of which is connected to the clock bus and to the counting input of the frequency divider, and the direct output of the trigger is connected to the second input of the coincidence element, the output of which is connected to the output bus, as well as a control bus, characterized in that, in order to expand the functionality by isolating from the sequence of bursts of pulses with an adjustable number of pulses per pack e and an adjustable length of the gap between the packets, a pulse former and a frequency divider are introduced into it, the output of which is connected to the C-input of the trigger, the S-input of which is connected to the output of the first frequency divider, the installation input of which is connected to the R-input of the trigger and to the output of the driver pulses, the first input of which is connected to the control bus, and the second to the inverse output of the trigger, the D-input of which is connected to a common bus, and to the installation P P P - L --- P P-.p -.- p FIG. 2 the input of the second frequency divider, the counting input of which is connected to the output of the matching element. P-P P - G1