Browsing by Subject "Time frequency representation"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    EEG sinyallerinde gamma tepkisinin tespiti
    (IEEE, 2006-04) Tüfekçi, D. İlhan; Karakaş, S.; Arıkan, Orhan
    In the detection of the existence of the early gamma response, subjective methods have been used. In this study, an automated gamma detection technique is developed based on the features obtained from the time - frequency representation of the EEG signal in the gamma frequency band. The technique easily discriminates the gamma response existing and non-existing cases for the generated synthetic data. The classification of the technique and that of the expert opinion coincide %77 for real EEG data. © 2006 IEEE.
  • Thumbnail Image
    ItemOpen Access
    High resolution time frequency representation with significantly reduced cross-terms
    (IEEE, 2000-06) Özdemir, A. Kemal; Arıkan, Orhan
    A novel algorithm is proposed for efficiently smoothing the slices of the Wigner distribution by exploiting the recently developed relation between the Radon transform of the ambiguity function and the fractional Fourier transformation. The main advantage of the new algorithm is its ability to suppress cross-term interference on chirp-like auto-components without any detrimental effect to the auto-components. For a signal with N samples, the computational complexity of the algorithm is O(N log N) flops for each smoothed slice of the Wigner distribution.