Bio-inspired Audio Processing, Models and Systems

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Schematic illustration of dense and sparse modeling. The first panel shows the “dense” filter resulting from l2-penalized LR. The second, third, and fourth panels show the sparse filters resulting from l1-penalized LR generated by LASSO and group LASSO. Non-active (zero-valued) elements are shown in white.
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Spike Count features for a digit sample “2”. The time window length for time binning in (A) is 5 ms and the number of events in a single frame for event binning in (B) is 25. There does not seem to be a clear advantage of choosing event binning over time binning when it comes to individual digits. Note that event binning for this example produces fewer frames compared to the time binning.
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