SU1580545A1 - Device for revealing loss of pulses - Google Patents

Abstract

The invention relates to a pulse technique. The purpose of the invention is to extend the functionality by detecting the number of lost pulses in a controlled sequence and simplifying the device. The device contains two elements AND 3, 4, the trigger 5 and the element OR 6 of the pulse generator 1 and the binary counter 2, which allows to extend the range in which the pulse tracking periods of the controlled sequence can change without changing the elements of the device. 2 Il.

Description

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The invention relates to a pulse technique and can be used to control pulse sequences.

The purpose of the invention is to increase reliability.

Figure 1 shows a block diagram of a device for detecting loss of pulses; figure 2 - timing charts of the device.

The device contains a pulse generator 1, a binary counter 2, elements AND 3 and 4, trigger 5, element OR 6, input 7 and output 8 tires. The output of the pulse generator 1 is connected to the counting input of a binary counter 2j, the first group of outputs of which is connected via the first element I 3 to a single input of the trigger 5, one of the outputs of which is connected to the output bus 8 of the device, and the second group of outputs of the binary counter 5 is connected through the second element I 4 with the second input of the element OR 6, the first input of which is connected to the input bus 7 of the device and the output of the element OR 6 is connected to the inputs of the installation in O of the trigger 5 and the binary counter 2.

The device works as follows.

The next pulse of the monitored sequence from the input bus 7 through the element OR 6 (Fig. 1), the trigger 5 and the binary counter 2 are reset to the zero state. In Fig. 2, the monitored sequence pulses are presented (11,12,1 - missing pulses). Pulses from a generator of 1 pulses (FIG. 2, b), whose frequency is higher than the frequency of the monitored pulses by m times, arrive at the counting input of the binary counter 2 (Fig. 1) therefore after filling the last to the binary code m with the following monitored pulse from the input bus 7 through the element OR 6 (Fig. 1), the binary counter is reset to 0, and the filling cycle of counter 2 to code m is repeated.

When the next pulse falls out (Fig. 2, a) I, in a monitored sequence, the counter 2 is filled with the pulses of generator 1 until code m is not reset, but continues to count pulses from the generator (figure 1), therefore when the code n is reached on the estimator 2 (n t) on the first group out

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The signals of counter 2 emerge single signals which, through element 3, set trigger 5 to one state. A forefront of the signaling pulse is formed on the output bus 8 (FIG. 2, c, the leading edge of the pulse S). Then, when the counter 2 is filled (FIG. 1), the single signals on the second group of outputs of counter 2 appear before the code k (k p), which, through AND 4 and OR 6, reset binary counter 2 and trigger 5 into O. This on the output bus 8 is formed by the falling edge of the 8h signaling pulse (Figure 2, c). When the second pulse 1 falls out in a controlled sequence (Fig. 2, a), a second signaling pulse 8g appears on the output bus 8 (Fig. 2c), etc.

When the next monitored pulse occurs, the counter 2 and the trigger 5 are set to the zero state, and the monitoring process is repeated.

The parameter m is a binary code that determines the number of pulses coming from a generator during the time interval between two adjacent pulses of a controlled sequence. The parameter n is the number of pulses coming from the generator, after which the decision is made about the loss of the pulse of the controlled sequence. The number n () is determined taking into account possible changes in the period of the controlled sequence. The parameter k is a binary code that determines the number of pulses from the generator, after which the device is again ready to check for the presence of pulses in the controlled sequence (k n 2m).

Thus, in the proposed device in comparison with the known ones, the absence of any number of pulses in the controlled sequence is detected. The number P of the lost additional pulses is determined by the formula

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where S is the number of signaling pulses. At the same time, the limits within which the pulse period of the controlled sequence can change can be changed due to the possibility of changing the parameters m, n and k in a wide range without adding additional devices to the circuit, i.e. device simplification is achieved.

Claims (1)

An apparatus for detecting a loss of pulses, comprising a pulse generator, the output of which is connected to the counting input of a binary counter, a trigger, the first input of which is connected to the output of the first element AND, the second element AND, the element OR, the input and output bus, different This is because, in order to increase reliability, the first group of binary counter outputs connected to the inputs of the first AND element, and the second group of binary counter outputs is connected via the second AND element to the second input of the OR element, the first input of which is connected to the input bus of the device, and the output of the OR element is connected to the inputs of the installation in O of a binary counter and a trigger whose output is connected to the output bus. FIG. 2