Supplementary Figure 7: Wearable accelerometers allow discrimination of vocalizations from four males
From: Reconstruction of vocal interactions in a group of small songbirds
The upper panel shows a sound spectrogram of vocalization of four males to be separated and analyzed (the sound was recorded with a wall-attached microphone, see also the Supplementary Video 1 for the birds’ behavior). The spectrograms in the middle show that the wearable microphones pick up mixed vocalizations from several birds, making signal discrimination difficult at least. By contrast, accelerometers spectra (bottom) recorded vocalization of just their hosts, allowing for simple threshold-based vocal discrimination. Episodes of individual vocalizations are marked by yellow horizontal bars. The accelerometers were sensitive to rapid bird movements. During episodes of inactivity accelerometers were often able to pick up heart beats (in animals 1 and 3, red ellipses).
