SU1548844A1 - Device for selection of pulses - Google Patents

Abstract

The invention relates to automation and computing and can be used in measuring and recording devices, automatic control devices, as well as in information systems for collecting and processing data. The goal is to increase reliability by ensuring the selection of pulses according to the ratio of the time that pulses exceed specified levels. The device contains two threshold elements, a pulse generator, the first counter, the first element of the comparison, the first element And, the trigger. Additionally, a second counter, a second reference element, a second and third AND elements, an NOT element, a delay element, an OR element are introduced. 1 il.

Description

The invention relates to automation and computing and can be used in measuring and recording devices, automatic control devices, as well as

in information systems for collecting and processing data.

The aim of the invention is to increase reliability by ensuring the selection of pulses according to the ratio

time exceeding the pulses given conditions.

Figure 1 shows the structural diagram of the device; 2, time diagrams of the device operation.

The device contains the first 1 and second 2 threshold elements, the first 3, the second 4 and the third 5 And elements, the first 6 and second 7 counters, the first 8 and second 9 comparison elements, trigger 10, NOT AND element, delay element 1, OR element 13, pulse generator 14.

The device works as follows.

When the switching element is opened (the Start button) through the OR element 13, the first 6 and second 7 counters are set to the zero state (Fig. 26).

 The input analog signal is fed to the inputs of the first and second threshold elements 1 and 2, where the analog input signal is compared (Fig. 2a) with predetermined threshold values and the duration of the input signal is measured at the level specified by the thresholds in elements 1 and 2. The duration is measured in the following way. If the input signal has exceeded the threshold level set by the first threshold element 1, then a high voltage level from the output of the first threshold element 1 (Fig. 2d) is fed to the input of the And 4 element. A high signal level at the input of the And 4 element allows the pulse pulses to pass 17 (FIG. 2b) to the counting input of counter 6, the contents of which increase by one every time with the arrival of the clock pulse and represents the duration of the input signal at the level specified by threshold element 5, Contents second 7 of the counter is incremented with the arrival of a clock pulse at a high voltage level is

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no output of the second threshold element 2 (Fig.2d). The content of the second counter 7 is the duration of the top of the input signal at the level specified by the second threshold element 2. In the case of a reverse transition ... threshold levels And 4 and 5 are closed, prohibiting the passage of the clock pulses of the generator 14 to the counting inputs of counters 6 and 7. At the same time, the negative voltage drop from the output of the first threshold element 1 is fed to the input of the HE element 11, the positive voltage drop from whose output (FIG. 2h) through the delay element 12 and the OR element 13 goes to the reset inputs of the trigger 100 counters 6 and 7, preparing the counters for measuring the pulse duration, and the trigger 10 for fixing the measurement result. These actions are repeated until "g elements of comparison 8 and 9 give out signals (Fig. 2e, g) so that the pulse duration and peak codes are larger and equal to the values applied to the inputs of the selection conditions. In this case, with the arrival of the signal from the output of the element NOT 11, an information signal is generated at the output of the element 3. The delay element 12 eliminates the situation where the voltage measurement signal generated at the output of the HE element 11 causes low voltage levels at the outputs of counters 6 and 7 before a high voltage level from the output of the HE element 11 arrives at the input of the And 3 element. .

Thus, the device makes it possible to increase the reliability of the device by extracting pulses of complex shape with predetermined pulse durations and vertices by analyzing the duration at two threshold levels.

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Claims (1)

DEVICE FOR PULSE SELECTION, containing two threshold elements, a pulse generator, a first counter, a first comparison element, a first AND element, a trigger, threshold element inputs are an information input of the device, the output of the first comparison element is connected to the first input of the first AND element, the outputs of the first counter connected to the first group of inputs of the first comparison element, characterized in that, in order to increase reliability by providing selection of pulses by the ratio of the time the excess pulses specified more precisely, the second counter, the second comparison element, the second and third AND elements, the NOT element, the delay element, the OR element, the first input of which is the device start input, the output of the first threshold element is connected to the first input of the second AND element and the input, are introduced into it NOT element, the output of which is connected to the second input of the first AND element and through the delay element to the second input of the OR element, whose output is connected to the counter reset inputs and the zero input of the trigger, the output of which is connected to the third input of the first e element And, the output of which is also the information output of the device, the output of the second threshold element is connected to the first input of the third element And, the output of the pulse generator is connected to the second inputs of the second and third elements And, the outputs of which are connected to the counting inputs of the first and second counters accordingly, the outputs of the second counter are connected to the first group of inputs of the second comparison element, the second groups of inputs of the first and second comparison elements are inputs of setting conditions for the selection of the device according to At the current level, the output of the second comparison element is connected to the input of the unit in the trigger unit. SU „, .1548844