Bird acoustic activity detection based on morphological filtering of the spectrogram

Audio event recognition methods based on the Hidden Markov Model / Gaussian Mixture Model (HMM/GMM) often depend on a large number of mixture components or multi-stage models that require significant computational and memory resources during their operation. A widely used approach for coping with complexity is employing an acoustic activity detector, which selects for further processing only those portions of the audio that are considered...