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(A) The MFSC spectrogram of the spoken digit “one”. The horizontal axis represents the index of frequency bands, and the vertical axis represents the time frames. (B) The spike coding of one frame (the row of pixels inside the black box) in Fig A. The MFSC features are encoded by the time-to-first-spike coding scheme. The higher the feature value, the earlier the neuron fires. Note that the time axis of Fig B is irrelevant to time axis of Fig A.
