Bat Detector

phone-mic bat-like transient detector

idle

The first 8 seconds learn the local noise floor. Keep the phone still and quiet. This is not a true ultrasonic detector; it only analyzes frequencies the phone/browser actually captures.

Sample rate

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Usable ceiling

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HF peak

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Possible calls

Detector band

waiting for microphone…

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Sensitivity

+10 dB over local floor

For a quiet desert site, start at +8 to +10 dB. If insects or handling noise trigger it constantly, raise the threshold.

Event log

No events yet.

Trigger rule: a short burst near the top of the phone's captured audio band that rises above the adaptive local HF floor and is stronger than mid-band ambient sound. Insects, electronics, keys, clothing, and aliased ultrasound can also trigger it. Alerts are candidates, not species IDs.