SU911715A1 - Device for detecting distortions in pulse trains - Google Patents

Description

The invention relates to a pulse technique and can be used in devices, carrying out control of equipment for information processing. A device is known for controlling a sequence of pulses containing two flip-flops and three elements And 1. However, this device monitors only the loss of pulses and does not allow detecting the presence of spurious pulses. The need for three clock frequencies complicates the device. Closest to the present invention is a device for detecting distortions in a sequence of pulses, comprising a driver, an anchor element, a shift register of N delay selection cells, two OR elements, an overflow decoder, distortion counters, a threshold decoder, an amplifier, and an indicator; the delay consists of a comparison element modulo 2, two amps &, counter and inverter 2) The known device provides for the detection of distortions in the temporary position of the pulses of the investigated follower different from the temporal position of the pulses of the reference sequence by an amount greater than the pulse duration period. However, the known device ensures normal operation only if there is a reference sequence, which reduces the possibilities of its use. In addition, with an increase in the time mismatch between the pulses of the reference sequence and the test, the amount of monitoring equipment increases by increasing the number of delay select cells, especially with increasing the frequency of Information symbols, which ultimately reduces reliability. The purpose of the invention is to simplify the device and increase its reliability. The goal is achieved in that a device for detecting distortions in a pulse train comprising a serially connected driver, an anchor element, a modulo-two element and an AND element, as well as a shift register, divider, counter and amplifier, the year of which is connected to the indicator the second inputs of the anchor element binding element and the AND element are combined and connected to the input of the shift register, the output of which is connected to the second by the input of the comparison element modulo two, the output of the element n The ribbons are connected to another input of the shift register, and the output of the And element is connected through the serially connected divider and counter to the amplifier input.

FIG. Figure 1 shows the block diagram of the device in fig-2, 2 timing diagrams explaining its operation.

A device for detecting distortions in a pulse train contains shaper 1, anchoring element 2, shifting register 3, modulo two element 4, element 2 AND, divider 6, counter 7, amplifier 8, indicator 9, in-bus 10 "bus 11 clock pulses ..

The device works as follows. .

The controlled pulse sequence is fed to the input of shaper 1 (Fig. 2, bus 11), which converts it into a potential sequence in which the potential of a logical unit corresponds to the presence of a pulse in a given clock cycle, and the potential of a logical

, zero - no impulse. From the output of shaper 1, the signal is fed to one of the inputs of element 2, which synchronizes it with a pulse, the clock sequence itself and is the matching device for the shift register 3. The signal from the output of the binding element 2 (Fig. 2a: is transmitted to register 3 and the first input of the comparison element 4, to the second input of which a signal is output from the shift register 3 (Fig. 26). The number of bits of the register 3 is determined by the repetition period of the structure of the monitored signal and is equal to N K.,

m where N is the number of bits shifting

register;

TL-- repetition period of signal structure

T is the period of the following clock pulses;

, 2, 3, .., p. If a symbol is lost or a false symbol appears in a controlled sequence (FIG. 2, bus 10), a distortion signal is generated at the output of element 4 (see FIG. 2B) and is fed to the input of element 5, the second input of which is connected to bus 11. Number of output pulses element 5 | (Fig.2g) is equal to twice the number of distortions; From the output of element 5, the signal goes to the input of divider b and then to the input of counter 7 (fig 2d); The result is through the amplifier 8 to the indicator 9.

Thus, the proposed device detects distortions (loss of symbols and the presence of false sims (Oxen) in almost any pulse sequence and does not detect the probability of distortion, not exceeding the square of the probability of distortion of the symbol of the sequence under investigation.

Claims (1)

1. USSR author's certificate No. 599341, cl. H 03 TS 5/18 ,, 1976. j 2, USSR Author's Certificate I 743184, cl. H 03 K 5/18, 1977,