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In this paper, we analyze the seismic signal in the time-frequency domain using the generalized S-transform combined with spectrum modeling.Without assuming that the reflection coefficients are random white noise as in the conventional resolution-enhanced techniques, the wavelet which changes with time and frequency was simulated and eliminated.After using the inverse S-transform for the processed instantaneous spectrum, the signal in the time domain was obtained again with a more balanced spectrum and broader frequency band.The quality of seismic data was improved without additional noise.