Supplementary Figure 6: Accelerometers achieve high–signal-to-noise recordings of vocalizations irrespective of background noise level
From: Reconstruction of vocal interactions in a group of small songbirds
(a-g) SNR Sound pressure levels (SPL) achieved with the wall microphone (light gray bars), backpack microphone (medium gray bars), and acceleration SNR (dark gray bars) during production of different calls, introductory notes, and song syllables in bird g2k8. The four levels of white background noise were: 0, 50, 60 and 70 dB. SNRs vary in the range [-23.1 37.9] dB for the wall microphone, in the range [0.92 33.9] dB for the backpack microphone, and in the range [11.6 29.3] dB for the accelerometer, showing that accelerometers provide the only feasible approach to unconstrained recordings of vocalizations under noisy conditions. SPLs are shown relative to 2 × 10-5 Pa (international standard). Acceleration is shown relative to 10-3 m/s2. (h) Intensity of background noise recorded with microphones and accelerometers. SNRs in a-g were computed relative to these levels.
