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A Time-Series Data Analyzing System Using a New Time-Frequency Transform

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2 Author(s)
Yih-Nen Jeng ; Dept. of Aero. & Astro., Nat. Cheng Kung Univ., Tainan ; You-Chi Cheng

A new time-frequency transform, whose resulting spectrogram has the best frequency resolution among that of existing transforms, is employed to construct a simple system of data acquisition and analysis. The transform employs an iterative and diffusive filter to remove the non-sinusoidal part. The spectrum of the sinusoidal part is evaluated by a strategy involving a fast Fourier transform (FFT). By imposing a Gaussian window centered at a given frequency on the spectrum, a band-passed data is obtained which is just the corresponding mode or real part of the transform. Finally, the corresponding amplitude is obtained via the Hilbert transform. A commercial microphone plugged into a notebook computer properly equipped with necessary software and the transform form a complete portable system. Two tests show that the system is a new tool to look into detailed information of a complicated data string formed from a single or multiple sources

Published in:

Innovative Computing, Information and Control, 2006. ICICIC '06. First International Conference on  (Volume:1 )

Date of Conference:

Aug. 30 2006-Sept. 1 2006