By Frank Fahy, John Walker
Complex purposes in Noise and Vibration provides remedies of acoustic and vibration phenomena including summaries of the most recent wisdom, research and strategies presently on hand for facing useful difficulties.
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Additional resources for Advanced Applications in Acoustics, Noise and Vibration
15; each sinusoid has unit amplitude. Note that the two lowest frequency sinusoids have very similar frequencies and are something of a challenge to resolve. The time series analysed contains 512 samples. In addition to the methods discussed herein, a classical non-parametric method is also used to compute a spectral estimate. Specifically, a segment averaging approach is employed (for details see Hammond 1998). 14. In each frame, the spectrum of the filtered noise is shown as a dotted curve and the frequencies of the sinusoidal components are indicated by vertical dotted lines.
Berlin: Springer-Verlag). Hlawatsch, F. and Boudreaux-Bartels, G. (1992) Linear and quadratic time–frequency representations. IEEE Signal Processing Magazine, 21–66. Kaveh, M. R. (1976) An empirical investigation of the properties of the autoregressive spectral estimator. IEEE Transactions on Information Theory, IT-22, 313–323. R. K. M. (1988) Modern Spectral Estimation: Theory and Application (Englewood Cliffs: Prentice-Hall). G.
In this case, these curves are drawn as sharper lines, implying that one can identify the arrival time of a specific frequency component with greater accuracy, suggesting that using the WVD may allow one to estimate dispersion laws more accurately than can be achieved using the spectrogram. However, the cross-terms in the WVD are also evident, most prominently as a chevron pattern between the two dispersion curves. In this case, the presence of these interference terms slightly impedes the identification of the dispersion curves.
Advanced Applications in Acoustics, Noise and Vibration by Frank Fahy, John Walker