Time Period - Astronomical sunset to midnight METADATA This is an automated recording station. 1. Microphone - SMX-NFC with a 16 bit sampling format and 24,000 Hz sampling rate 2. Recording Equipment - Song Meter 2+ by Wildlife Acoustics 3. Sound Analysis Software - Raven Pro 1.5 alpha 4. Flight Call Extraction – Raven Pro Band Limited Energy Detectors with the following settings: high frequency detector is 5800-11000 Hz, 23-395 ms duration, 104 ms minimum separation, 25% minimum occupancy, 3.5 dB signal/noise ratio threshold, noise power estimation is 4992 ms block size, 244 ms hop size, 50th percentile; low frequency detector is 2250-3750 Hz, 35-325 ms duration, 58 ms minimum separation, 20% minimum occupancy, 3.5 dB signal/noise ration threshold, noise power estimation is 998 ms block size, 244 ms hop size, 50th percentile. 5. Flight Call Identification and Review – Aurally and visually using Raven Pro Review Panel with the following spectrogram parameters: Context window is Hann 128 samples, 247 Hz 3 dB filter bandwidth, 79.7% overlap, 26 samples hop size, 256 samples DFT size, 86.1 Hz grid spacing; Thumbnails are Hann 256 samples, 124 Hz 3 dB filter bandwidth, 87.5% overlap, 32 samples hop size, 256 samples DFT size, 86.1 Hz grid spacing. 6. Notes:
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