A New Approach to Model Pitch Perception Using Sparse Coding
Fig 3
(A) An example of one atom in D. It is the AN population response to a sine wave of 1.5k Hz tone generated by the cochlear model [26]. The atom was normalized to a peak value of 1, as for all other population responses. The y-axis of the two-dimensional matrix represents the CF along the BM, and the x-axis is the post-stimulus time in milliseconds. (B) Each of the atoms, dj, j ∈ [1, M], is vectorized into a column in D. These M columns are concatenated to form the dictionary matrix D. All the input signals used for the creation of the dictionary have the same level of 30 dB SPL (i.e., at the cochlear linear region). In this example, we used only one atom per group (g = 1).