Fig. 4From: Robust feature representation for classification of bird song syllablesA part of the strophe in Fig. 3c; a The levels of the two smoothing filters, (blue-long filter, green-short filter) and detected samples using l sens =95 % (red). b The corresponding cut syllables including the 60 ms extension backward and forward, and with subsequent pairs of syllables manually labeled as similar (S) or non-similar (N)Back to article page