Window matching in the time-frequency plane and the adaptive spectrogram

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Window matching in the time-frequency plane and the adaptive spectrogram

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Title: Window matching in the time-frequency plane and the adaptive spectrogram
Author: Jones, G; Boashash, B
Abstract: Aspects of generating spectrograms which may be used in the preliminary steps of time-frequency analysis are discussed. It is shown that the major problem with the application of the spectrogram is its nonunique nature, i.e., the use of an arbitrary window for analysis. The concept of window matching is introduced, whereby the selection of the window used for analysis depends on the instantaneous signal characteristics at the given time-frequency point under analysis. Generalized instantaneous parameters are derived and subsequently used to demonstrate how the window matching may be applied. An adaptive window-matched spectrogram is generated. Practical data results are given.
Description: This paper shows that that a substantial improvement in resolution may be achieved by using the adaptive spectrogram. (The most recent upgrade of the original software package that calculates Time-Frequency Distributions and Instantaneous Frequency estimators can be downloaded from the web site: www.time-frequency.net. This was the first software developed in the field, and it was first released publicly in 1987 at the 1st ISSPA conference held in Brisbane, Australia, and then continuously updated).
URI: http://hdl.handle.net/10576/10754
Date: 1992-10

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