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Sociedade Brasileira de Telecomunicações

Warped Discrete S-Transform

This work introduces the warped discrete-time S- transform and the warped discrete S-transform to improve th e time frequency representation of the well-known S-transfo rm. The proposed transforms make use of a non-uniform mapping of tones in the frequency domain to increase the time frequen cy resolution in a specified frequency band. Numerical results show that the warped discrete S-transform can offer better time- frequency representation than discrete S-transform and sh ort time discrete Fourier transform. As a result, it has the pote ntial to increase the performance of techniques based on S-transfor m that have being designed to analyze non-stationary signals. Fin ally, it is demonstrated that the discrete S-transform is a particul ar case of the warped discrete S-transform.

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