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. 2015 Jan 13;12:2. doi: 10.1186/s12983-014-0094-5

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© Sibiryakova et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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.

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Measured acoustic variables. (a) Spectrogram of a hind nasal call (left) and a calf oral call (right). (b) Mean power spectrum of 50 ms fragment of a calf call. Designations: durat – call duration; dur-to-max – duration from call onset to the point of the maximum fundamental frequency; f0max – the maximum fundamental frequency; f0beg – the fundamental frequency at the onset of a call; f0end – the fundamental frequency at the end of a call; fpeak – the frequency of maximum amplitude within a call; power-f0 – the relative power of the f0 band compared to the peak harmonic; q25, q50 q75 – the lower, the medium and the upper quartiles, covering respectively 25%, 50% and 75% energy of a call spectrum. The spectrogram was created with Hamming window; 11025 kHz sampling rate; FFT 1024 points; frame 50%; and overlap 96.87%.