Spectral analysis of oscillations with a time-variable frequency
Abstract
The paper deals with a computer-aided method for evaluating oscillations of time-variable frequency. In this method, a given function is first interpolated at points that are not uniformly distributed in time, however, the digitizing step varies with time according to a known optional law. The spectrum of the function obtained is computed for a variety of such interpolations, and tests are run to determine when the interpolation compensates best the time variation of the frequency. The initial and terminal frequencies in a given sample are then determined.
- Publication:
-
Studia Geophysica et Geodaetica
- Pub Date:
- December 1979
- DOI:
- 10.1007/BF01633239
- Bibcode:
- 1979StGG...23..333S
- Keywords:
-
- Fine Structure;
- Geomagnetic Pulsations;
- Harmonic Oscillation;
- Interpolation;
- Sonograms;
- Spectrum Analysis;
- Computer Programs;
- Data Recording;
- Data Reduction;
- Data Sampling;
- Digital Techniques;
- Sine Waves;
- Geophysics