Sigmoidal NMFD: Convolutional NMF with Saturating Activations for Drum Mixture Decomposition by Len Vande Veire, Cedric De Boom, Tijl De Bie

“…We observe, however, that the activation functions discovered using NMFD do not show the expected impulse-like behavior for percussive instruments. We therefore enforce this behavior by specifying that the activations should take on binary values: either an instrument is hit, or it is not. …”
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