Figure 2 | Scientific Reports

Figure 2

From: Enhancing the decoding accuracy of EEG signals by the introduction of anchored-STFT and adversarial data augmentation method

Figure 2

Representation of time–frequency resolution of standard STFT and anchored-STFT. (a) shows the time–frequency resolution of a fixed length window K of STFT. (a 1.1) A fixed length window K that is convolved with the time series signal with a fixed stride (s). (a 1.2) The spectrogram obtained by convolving the window K with time series signal. Here, frequency resolution remains the same for all locations of the spectrogram. (b) The time–frequency resolution of anchored-STFT. (b 1.1) That anchors of different lengths are convolved with the time series signal using stride (s). (b 1.2) That anchor K1 with short length results into better time resolution and low frequency resolution spectrogram. Anchor K3 with longer length provides better frequency but low time resolution spectrogram. The green and black colored boxes show a frequency component computed for anchors of different lengths which in turn provides different frequency resolution for each anchor length.

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