SU368609A1 - DEVICE FOR AMPLITUDE ANALYSIS OF ELECTRIC SIGNALS - Google Patents

Description

one

Amplitude processing of random processes recorded during dynamic (running) tests of rolling stock is performed by out-sampling some values (maxima, quantized by level or time, instantaneous values, etc.) and sorting them into classes of amplitudes. The measurement of these values is made relative to the zero level, which is established with a balanced measuring bridge.

In the study of the symmetry of oscillations with respect to the zero level, it becomes necessary to separately measure the n-positive and negative parts of the record. Here, the process recorded on a magnetic tape is reproduced and processed twice.

Such processing can be done with the help of well-known analyzers. The results of processing are presented in the form of readings of electromechanical meters, which must be charged off manually.

The proposed device differs from the known ones in that it additionally contains a signal sorting unit, the input of which is connected to the output of the magnetograph, and the output is connected to the third input of the memory unit, the input 1 of the recording control unit is connected to the output of the selector.

This allows the construction of two distributions (for the positive and negative portions of the signal) during a one-time reproduction of the process. In this case, given

Distributions are presented in a convenient form.

for entry into an electronic computer using a perforator.

On fig. 1 is given a block diagram of the proposed

devices.

The device contains a magnetograph Y, an inverter 2, a selector 3 consisting of an amplitude discriminator 4, a null organ 5, a one-shot (recording control unit) 6, a recalculation circuit 7, a unit for sorting half-periods of oscillations based on polarity 8,

consisting of a null organ 9 and a memory block selection scheme 10, and a memory block //.

FIG. 2 shows a time diagram of the operation of the device, where a is the graph of the signal under study; b - zero-organ impulses 5;

c — null-organ impulses 9, d and d — blocking pulses of the first and second memory blocks of the memory unit, respectively; e - amplitude discriminator pulses; g - single-vibration pulses and g - recording pulses.

Magnetograph / serves to record and reproduce the processes under study in the form of electrical voltage according to the method of frequency modulation. Inverter 2 is a DC amplifier and two diodes,

connected to the input and output of the amplifier.

The discrimination discriminator 4 consists of a set of cells, each of which is set to a certain level of operation. The cell includes two triggers with one and two stable states. The zero-organisms 5 and S are triggers with one steady state, tuned to act on a zero level. Scaling circuit 7 is assembled on triggers with two stable states. The circuit for selecting the busbar of memory unit 10 includes a trigger and two cathode repeaters.

The device works as follows.

The signal under study in the form of electrical voltage goes from the magnetograph / to the inverter 2, in which the negative half-cycle changes the polarity and the positive half-cycle H passes through the diode without changing. Thus, at the inputs of the amplitude discriminator 4 and null-bound 5, both half-periods come in positive polarity. The amplitude discriminator cells operate as the input signal increases (Fig. 2, a). At the moments of intersection by a signal of the next cell level, pulses are produced (| Fig. 2, d). The resetting of the cell triggers to the initial state is carried out by pulses (Fig. 2, b) of the null organ 5 at the moments when the signal crosses the zero level.

The discriminator pulses are fed to the inputs of the scaling circuit 7 and the recording control unit (one-shot) 6, which produces short rectangular pulses (Fig. 2, g).

Directly from the magnetograph (before the inverter), the signal arrives at the input of the half-cycle sorting unit on the basis of polarity. The null-organ 5 of this block generates pulses (Fig. 2, c), which overturn the trigger of circuit 10, the voltage drops from the trigger arms (Fig. 2, d and (3) through the cathode repeaters alternately open the inputs of the first and second buses of the memory block 11. For the time of the positive half-period, the input of the first tire opens (Fig. 2, d), for the time of the negative ooluperiod (Fig. 2, e) the entrance of the first spikes closes and the second opens.

All memory cells are divided into two groups of ten cells in each group. The tire inputs of the groups are opened alternately by the circuit 10, and the inputs of the tires penetrating the cells of both groups are opened by the counting circuit successively as the pulses of the disk drive (Fig. 2, e) are received.

The open tires are sent recording pulses (Fig. 2, h), shifted relative to the discriminator pulses by the duration of the pulse duration of the one-shot 6 (Fig. 2, g). The delay of the write pulses is determined by the time required to select the address of the memory location. In the cell element of the memory unit, standing at the intersection of open tires, one is added to the previously recorded information.

For example, for the oscillation shown in FIG. 2, the unit is added in six cells of the first group and in four cells of the second group.

When the next wave arrives, the recording process is repeated. Thus, as a result of processing a one-time reproduced signal in the storage unit of the device, the data of two distributions are accumulated separately for positive and negative half-periods.

For the purpose of determining statistical estimates of distributions or other indicators (for example, process symmetry) using an electronic computer, data can be displayed on a perforator, as well as on digital printing.

It is obvious that the sorting idea on the basis of the polarity of the half periods of oscillations of quantized levels of instantaneous values, implemented in the proposed device, can be extended to other types of processing. For example, to sort by this feature instantaneous values corresponding to extremes of oscillations or quantized in time. In these cases, the Amplifier discriminator must be replaced either by an extremum extraction device, or by the applicator in time.

Subject invention

A device for amplitude analysis of electrical signals, comprising a magnetograph connected via an inverter to a selector, the output of which is connected to the first input of a memory unit through a scaling circuit, a recording control unit whose output is connected to a second input of a memory unit, characterized in increase the accuracy of the device, it additionally contains a signal sorting unit, the input of which is connected to the output of the magnetograph, and the output is connected to the third input of the memory unit; the input of the recording control unit is connected to the output of the selector.

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