SU832491A1 - Device for analysis of random processes - Google Patents

Description

one

The invention relates to radio engineering and can be used to analyze random processes in order to determine the nature and structure of non-stationary processes.

Analysis devices are known that consist of a description formation unit — a parallel analyzer of the Fourth spectrum, a three-dimensional indicator with coordinates of frequency, time, intensity (brightness) and a two-dimensional indicator with coordinates of frequency, intensity. On the screen of the cathode ray tube indicator, you can see the time-frequency structure of the process under study in the form of a relief of brightness.

However, their resolution is insufficient.

The purpose of the invention is to increase the resolution.

The goal is achieved by the fact that the device for analyzing random processes, which contains a spectrum analyzer, three-dimensional and two-dimensional indicators, introduces a current average evaluation unit, a current dispersion measure evaluation unit, a subtraction unit and a scaling unit, the output of the spectrum analyzer connected to the current average evaluation unit input, with the first input of the evaluation unit of the current measure of variation and with the first input of the subtraction unit, the second input of which is connected to the output of the evaluation unit of the current average and with the second input of the evaluation unit of the current its scatter measure, the output of the subtraction unit is connected to the first input of the scaling unit, the third input of which is connected to the output of the evaluation unit of the current spreading bar, the output of the scaling unit is connected to the three-dimensional input and the input of two dimensional indicators.

The drawing shows the structural scheme of the device.

The device contains a description formation unit 1 — a spectrum analyzer, a subtraction unit 2, a scaling unit 3, a current average estimator 4, a current scatter measure estimator 5, a three-dimensional indicator b with coordinates: a spectral coefficient number, time, intensity and a two-dimensional indicator 7 with coordinates : number of spectral coefficient, intensity.

Claims (1)

The device works as follows. Investigated; A random process is fed to the input of the description generation unit 1. This block generates some vector shape / corresponding to a certain segment of a random process. As such a form, one can use the well-known forms of signal description, for example, the Fourier amplitude-frequency spectrum, the Walsh modular frequency spectrum, order or pseudo-order statistics, a trace diagram of the correlation function, etc. In addition, in the same block, the sequence of description vectors is preliminarily averaged, which corresponds to a sequence of segments of a random process. Thus, a description formation block is a conventional analyzer of a random, process in the broad sense of the word. The obtained vector description of a random process is fed to the input of block 4 of the current average estimate. In this block, the vector of averaging is calculated, and averaging is performed in accordance with a certain time window or a certain pulsed characteristic of this block. In averaging links, for example, integrating circuits or other more complex links can be used. Then, in block 5 for estimating the magnitude of the current spread, a vector characterizing the degree of deviation of the spectral coefficients from their average values is calculated. As the measure of the spread, Moryvr should be chosen, for example, the standard deviation or mean modulus of deviation from the mean. The value of the vector of the average value required to calculate the measure of spread is taken from block 4. The values obtained in blocks 4, 5 are used to center the random process, i.e. its mean value is reduced to 0 and scaled. In block 2, an intermediate description with zero mean is formed. Then, in scaling unit 3, the spreads of the spectral coefficients are normalized. For this, a gain factor is established for each spectral coefficient, inversely proportional to the estimated scatter parameter. The resulting form is displayed on a three-dimensional indicator 6 with coordinates: the number of the spectral coefficient (horizontal sweep), time {vertical sweep) and coefficient intensity (indication of luminance). Two-dimensional indicator 7 allows to obtain a time section of the spectral-time1 pattern in the coordinates: the number of the spectral coefficient of the horizontal scan) and the amplitude (vertical scan). , For the stationary part of the random process, a uniformly gray light is observed on the screen of the three-dimensional indicator. Moreover, all coefficients, regardless of their mean values and magnitudes of the variations, are derived equally. In case of violation of stationarity and deviation of the average parameters of the description of the random process from the values recorded in blocks 4, 5, these changes and their character are clearly visible on the screen of the three-dimensional indicator. The invention includes a random process analysis device, containing a spectrum analyzer, three-dimensional and two-dimensional indicators, characterized in that, in order to increase the resolution, a current average estimator, a current scatter measure unit, a subtraction unit and a scaling unit are inserted into the device, and the output the spectrum analyzer is connected to the input of the current average estimator, to the first input of the current scatter measure estimator and to the first input of the subtractor, the second input of which is connected to the output of the block evaluating the current average and with the second input of the evaluation unit of the current measure of spread, the output of the subtracting unit is connected to the first input of the scaling unit, the second input of which is connected to the output of the evaluation unit of the current measure of variation, the output of the scaling unit is connected to the input of the three-dimensional and two-dimensional indicators. Sources of information taken into account during the examination 1. Sund N. And Sound spectrometer for Speech anaJuses. Transactions of tre R I, 112, 1957, p. 1-66.