Spectral analysis of oscillations with a time-variable frequency |
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| Authors: | Jaroslav St?e?tík Reviewer M Hvo?dara |
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| Institution: | (1) Geophysical Institute, Czechosl. Acad., Sci., Prague |
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| Abstract: | Summary The paper presents a method of evaluating oscillations with a time-variable frequency using a computer. The given function is first interpolated at points which are not distributed equidistantly in time, but the digitizing step varies with time according to a known optional regularity. The spectrum of the obtained function is computed for various of these interpolations and tests are run to determine when the interpolation best compensates the time variation of the frequency. The initial and terminal frequency in the given sample is then determined. The usability of this method with respect to various types of oscillations with a variable frequency and its accuracy in comparison to sonagrams are discussed. |
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