Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2015 Sep 9;8:425. doi: 10.1186/s13104-015-1394-3

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© Baotic et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

PMC Copyright notice

Fig. 2 — Narrow-band spectrogram and waveform of an acoustic signal within the infrasonic range. Example of an acoustic signal recorded at Berlin Tierpark proving that the used Song Meter SM2+ (Wildlife Acoustics Inc.) for this study is capable of recording frequencies below 20 Hz. Dashed white line and black arrows indicate a detected signal at an average of 14.08 Hz. The spectrogram was generated in Praat 5.4.01 using the following settings: Gaussian window shape; frequency steps: 1000; time steps: 250; frequency range: 0–10 kHz; window lengths: 0.4 Hz; dynamic range: 40 dB